Re: [RCSE] Altimeters
Hi I have been repairing the Ace Sniffler for sometime now. The Tx case is sealed air tight is used as an air chamber. There is one screw with a pin-hole drill through its lenght in the side of the Tx case. This is an orifice that meters the air flow in out of the Tx case. In the Tx case their is a short piece of tubing that goes over the end of the screw on the side of the case the other end goes over a smaller case (air flow meter) that has two bead thermisistors (about .015" OD each bead). The two thermisitors sit side by side in line with a hole (about .062" ID) through their case. The air flows through this air flow meter, in out of the bigger Tx case. The thermisistors (1K to2K) are in a bridge circuit. When the Tx goes up higher in the air, air flows out of the Tx case cools just the one thermisistor in line with the air flow through the air flow meter . The air flow over the first therm blocks the the flow over the second therm., so it is not cooled as much. Then when the Tx case comes down lower, the air flows into the Tx case cooling the other therm. So you get a a tone change, higher when air flows out of the Tx case lower when air flows into the Tx case. The Picolario Talk is on 433 Mhz is in the Ham Bands this freq falls in the use fro Auxiliary/repeater link control. So you would have to be a Ham, then is some parts of the USA you could interfere with these link/control freq. Howard Rudy KA7YWO SLC, Ut. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Getting shot down.
You have let the secret out. Now we will find 6m to crowded to use. Have to move higher up in the Ham bands. Like 420 Mhz, 902 Mhz, 1240 Mhz. Could make use of some of the IC's made for the home cordless spread spectrum phones. Hams could make are own spread spectrum R/C Radios But before you will see spread spectrum R/C Radios for use by general public, you have to fight for a peace of the RF spectrum that all the Big Boys (Corporations ) want to use up. The FCC is making big money selling off parts of the spectrum to the Corporations. It would be very nice to have this technology for R/C. It would probably take lots of money, lobbying the gov.. Got 4 or 5 million or more to put in lobbying for 2 Mhz in the 900 Mhz spectrum. The price of are Radios would be a bit higher, but should not be that bad. Howard RudyKA7YWO SLC, UT. [EMAIL PROTECTED] wrote: I feel bad for the pilot on Channel 21 that got shot down by a park flier. It's amazing that more of this doesn't occur. The following is a plug for getting a Ham ticket and flying 6 meters. I started flying R/C when there was only 27 Mhz and the ham bands. The CBers shot a lot of my balsa down. I got a Ham ticket and have not been troubled since. In April, 2000 the FCC made the Ham "Tech" license a no-code test. The written is a question pool so passing is fairly easy. It's a little extra work but the rewards are super. If anyone needs more info, please contact a local Ham, the local Radio Shack store or www.arrl.org. Good luck. Pete Carr WW3O State College, PA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Can hornytoads fly?
Well they can fly to too. Sometime ago (20yr) we had a member of the ASPCA checking on some horses in a field next to are farm. A big dust devil came a long and picked up the woman, carried her over the fence and dropped her 10 ft away. She didn't land well, but she walked away from the landing. ;)She was very lucky. One of the papers and a radio station had a lot of fun with it. I have seen a lot of dust devils come through are hay fields and make a big mess. I have seen a column of cut hay pulled up 80-90 in the air. It comes down in trees and over power lines. But I have never had a plane handy at the time. I hope I will, when the next one comes through. Howard SLC, UT. Bill Harris wrote: Hey! Watch out-- we don't want to get the ASPCA on our tails... --Bill On Mon, 5 Jun 2000 12:37:20 -0500 [EMAIL PROTECTED] wrote: Depends on how hard you kick'em. :-} __ Matthew Kovacs AMD Fab 14/15 Etch Engineering 5204 E. Ben White Blvd., M/S 540 Austin, Texas 78741 (512)602-2662 -Original Message- From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]] Sent: Monday, June 05, 2000 12:34 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: [RCSE] Can hornytoads fly? A little off subject but; I saw a hornytoad at my local slope yesterday, and being shaped like a flying squirrel, wondered if they could glide. Anyone know? RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Radiation patterns
Your body acts like the lower 1/4 wavelength of your Ant.. It's capacitively coupled to you through your hands. This is way from perfect, but it does work. When a Tx get a tune-up, the Tx Ant. matching ajustment should be done held like you would when you fly. This would give the best match (lowest SWR). But every time you move the Tx, (tilt it or hold it higher or lower) this will change the match. If you add a 1/4 wave ground wire to the Tx you will change the Ant. match and should have it retuned. But when you still move the Tx (tilt it, hold it higher or lower) will change the match. The way the Radio's come from the factory work quite well. A good working compromise. Just do a range test before you fly. Howard "Y.K.Chan" wrote: Just remember folks, a 1/4 wave antenna cannot hold its characteristic impedance and the "donut shape" radiation pattern missing its ground plane or a second 1/4 wave to form a half-wave dipole. Lets have fun with a simple (indicative) non-scientific experiment. Partially inflate a party balloon near 50% max volume, use only both of your index finger align one axis and pinch the balloon at opposite peaks until finger tips feel one another. Your finger axis represent a dipole antenna axis. Your two fingers represents a two (1/4 wave) di-pole elements. And the 3D shape of the balloon under such condition represents the radiation pattern of a dipole antenna in free space. Now, reset the above and place the balloon on a ground plane (or a table of width at least one balloon diameter wide) and pinch it with only one index finger. Finger axis vertical to ground plane. Once again a pattern is formed, but the pattern now is some what different to the first form with two fingers. That represent a 1/4 wave antenna's radiation pattern. Once more, try to construct a radiation pattern with a balloon and one index finger and no ground plane, yes nothing else. Tell me what shape would the balloon be? A spherical pattern with no compression, siting on our index finger? Your guess is a good as anyone here. Once again, please try not waste too much time advocating any concern or rule of thumb for a ground-less 1/4 wave antenna. Antenna wire (plus wire harness length) falls within 39" +/-50% may be just as bad/good once airborned. My attention will be given to how close it is to 78" (72MHz) airborned/off-ground. YK in Seattle RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Radiation patterns
This is not totally correct. The shorter mached Ant. like a rubber duck does have its max radiate signal down its lenght, but not striate off its end. The short Ant. radiation pattern, has more power radiated at a higher angle, and less striate off it side. The ratiation pattern off a vert. Ant. looks like a donut. With a ture 1/4 wave Ant. this donut pattern looks more flat and pushed out the sides. As you shorten the Ant. and it's still electrically mached to 1/4 wavelength. The Ant. pattern looks like it's being squeezed in on the side, so this push the pattern more up in the air, a round the Ant. This could give you more radiation off the upper end (45 to 60 degs. angle up from the sides of the Tx). But striate off the end of the Ant. there is still a hole with very very low radiation. If you had a singal strenght meter and could run it in a radius from the ground (side) of the Ant. to striate over head (off the end) of a vert. Ant.. With you long Ant. on your Tx you will get higher reading off the side and the readings will drop off fast as you start going over 45 degs. up from the side. And very very low off the end (top) of the Ant. With the Rubber Duck you will start off with lower reading off the side but as you go up to 45 degs. and up to around 60 degs. you will have higher readings than with you long Tx Ant.. But you will find that as you get over the end (top) of the Ant. it will still be very low. With a very very short Rubber Duck Ant. you could start to get a radiation pattern that would look like a ball. But the radiation efficient is very low, have lower range. The Tx Ants. are a good compromise for the way we use the Radio's. That's not making the radiation patterns so tight to make the pattern too directional, so we have to make sure that we keep your Plane off the side of the Tx Ant.. HowardKA7YWO SLC, UT. Bill Swingle wrote: CUT Coil antennas, such as rubber ducks, are the opposite. They radiate their signal directly in line with their length. Thus, for maximum signal, you do want to point the duck at your plane. Once again though it's usually not significant if your equipment is functioning properly. Bill Swingle [EMAIL PROTECTED] Pleasanton, CA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] ASTRO FLIGHT web site?
Hi Can anyone send my the ASTRO FLIGHT web site if they have one. Or can anyone tell me about the #217 micro-series speed control. Thanks Howard SLC, UT RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] FS; Gel-cell battery chargers
For Sale: Gel-cell battery chargers. I have about 12; 1 Amp chargers that are used to keep alarm system batteries fully charged. Anyone like one, I will sell for $10.00 ea shipped in the USA. Can get some 2 Amp 4 Amp chargers too. At $15.00 $25.00 ea. Howard Rudy SLC, UT 801-532-8511 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Why Negative Last
That was for jumping lead acid batteries for cars. But one thing was missed about hooking the negative last, was that the neg. cable was to be hook up away from the battery. Hook to some part of the frame of the car. The battery gives off hydrogen gas. It is very inflammable, and can blow the top off the battery from any sparks from the jumper cables hook to the battery. The first battery you can hook up at the battery posts. The second battery you should always hook the (+) to the battery first. Then hook the (-) away from the battery, to the car frame. Some of the new cars have a place to hook up the jumper cables away from the battery. Any other types of batteries it would make any difference which was hooked up first. Also if you are installing a new car battery, if you hooked up the neg (ground) first then hook the positive and slip with your wrench. You can also blow up the battery, melt/ weld the wrench in place. It is also a good idea to take off all rings watches with metal bands. Howard Rudy SLC, UT. George Voss wrote: Why are we told to hook up the negative lead to a battery last, such as when hooking up our battery charger to a 12V source? gv RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Futaba tx modules synthesized?
Yes, just get modules for the channles you use. The main idea with the modules is to make it easy to change channels without the need to have the Tx tuned. Each module has been factory tuned to be right on freq. for the crystal in the module. So the Tx doesn't have anything in it to affect the output freq. If you used a module in a Tx that it was not design for, that Tx could have higher signal levels to drive its module. This would over drive the module and cause interference to other channels. (like the Hitec synthesized module in the Futaba Tx) Howard SLC, UT. [EMAIL PROTECTED] wrote: I just bought a used Futaba 8uaf which comes with a module on channel 56. My stuff all is either on channel 42 or 52. Is it safe to get modules on either of these channels without having to send my transmitter back for retuning? Are the modules themselves tuned to prevent this? I hate to have to tear open any of my slopers to change a crystal. Thanks, Greg RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Update; Rx problems-need a source of choke
Sorry all, but I was very tired and not thinking clearly when I made the post to the list on the core materials. We need to use 43 material, good for freq. from 25 Mhz to 200 Mhz. I had 73 on my mind from the use on another project. 73 is good up to 30 Mhz. So I repeat Use 73 Material.The Fair-Rite Proucts Corp P/N is 2643002402 Howard RudyKA7YWO SLC, UT. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Very Stupid Knife Trick
The worse accident that I know that happen with an X-acto was at a little Design Company I started working at in 1970. This guy was working on a mould plug. He was holding between his legs when he slipped with the knife. He did half of a self castration. To this day I put on a leather welding apron when working with any knifes at the workbench. This is one thing that I will never forget. Howard Rudy SLC, UT. "Creager, Robert S" wrote: I think I can claim the much worse. I was doing something very similar, applying too much pressure to cut a Rubbermaid trash can. When rounding a corner with the cut, the blade released from the plastic and plunged into my forearm. No blood because of a quick clamp with a shirt and my hand, but a very painful 20 minute drive to the local Emergency room. I now have a wonderful "S" scar where they had to repair 2 muscles, 2 tendons and 1 nerve in a 2 1/2 hour surgery. I then spent the next three weeks (on vacation in Australia) with my forearm/hand in a "thing" to keep my wrist in a bent position. It's not easy to snorkel in this configuration... Later, Rob How? Putting too much pressure on an Xacto with a #11; swift, clean, lots of blood. The upside: it could have been *much* worse and, if the adage about blood and model quality holds, my next one ought to be *great*. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] lead shot
In Cabela's 2000 Shooting Catalog ph.# 800-237- page 55 item # XL-21-0316-003 #4 Lead Shot, 5 lb bag $9.99 Jim Ealy wrote: Hi Guys: I need a cheap source for good old fashion lead shot. (25 lb bags) None of the local gun shops carry Remington lead shot anymore. reply offline and thanks in advance Jim Ealy AMA L-43 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Charts for Ohm's Law
For everyone that needs Ohm's Law there are some sites here that have some good info charts to print out, or you can use the list below Howard Rudy http://www.angelfire.com/pa/baconbacon/index.html http://www.angelfire.com/pa/baconbacon/page2.html http://www.angelfire.com/pa/baconbacon/page3.html http://www.angelfire.com/pa/baconbacon/page4.html Symbolic: E =VOLTS ~or~ (V = VOLTS) P =WATTS ~or~ (W = WATTS) R = OHMS ~or~ (R = RESISTANCE) I =AMPERES ~or~ (A = AMPERES) HP = HORSEPOWER PF = POWER FACTOR kW = KILOWATTS kWh = KILOWATT HOUR VA = VOLT-AMPERES kVA = KILOVOLT-AMPERES C = CAPACITANCE EFF = EFFICIENCY (expressed as a decimal) DIRECT CURRENT AMPS=WATTS÷VOLTS I = P ÷ E A = W ÷ V WATTS=VOLTS x AMPSP = E x IW = V x A VOLTS=WATTS ÷ AMPSE = P ÷ IV = W ÷ A HORSEPOWER=(V x A x EFF)÷746 EFFICIENCY=(746 x HP)÷(V x A) AC SINGLE PHASE ~ 1ø AMPS=WATTS÷(VOLTS x PF) I=P÷(E x PF) A=W÷(V x PF) WATTS=VOLTS x AMPS x PF P=E x I x PF W=V x A x PF VOLTS=WATTS÷AMPS E=P÷IV=W÷A VOLT-AMPS=VOLTS x AMPSVA=E x IVA=V x A HORSEPOWER=(V x A x EFF x PF)÷746 POWERFACTOR=INPUT WATTS÷(V x A) EFFICIENCY=(746 x HP)÷(V x A x PF) AC THREE PHASE ~ 3ø AMPS=WATTS÷(1.732 x VOLTS x PF) I = P÷(1.732 x E x PF) WATTS=1.732 x VOLTS x AMPS x PFP = 1.732 x E x I x PF VOLTS=WATTS÷AMPS E=P÷I VOLT-AMPS=1.732 x VOLTS x AMPSVA=1.732 x E x I HORSEPOWER=(1.732 x V x A x EFF x PF)÷746 POWERFACTOR=INPUT WATTS÷(1.732 x V x A) EFFICIENCY=(746 x HP)÷(1.732 x V x A x PF) RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] R/C Electronic Projects URL's
http://www.vision.net.au/~timotsc/elecmod2.htm http://enterprise.powerup.com.au/~wbag/ccts.htm http://www.uoguelph.ca/~antoon/gadgets/gadgets.htm http://www.ee.ualberta.ca/~charro/cookbook/ I have some sites here that have a lot of circuits. Hope this will be of help. Howard Rudy Salt Lake City, UT. Simon Van Leeuwen wrote: Someone recently posted a bunch of URL's pointing to various RC projects one can build. Can you please send them to me. Thanks. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] midair
The Picture shown is the final resting position of the planes. I am sure that the landing would have moved the planes around alot. I am surprised that the Cadet even stayed on top of the 152, like the picture shows. Surprised that the 152's landing gear held up. So they both screwed up, Not using the Radio or listening to it, not checking the airspace and landing pattern. etc. But one thing that's for sure, is they all were very lucky. Was not their time to go. Howard Salt Lake City, Ut. Aerofoam wrote: I just saw the picture and can't beleive it still flew! I don't think the inboard 1/3rd span of either plane could produce lift and the outer panels had to have a lot of interference. This may have been more of a devine intervention than a lucky break. Mark Mech [EMAIL PROTECTED] www.aerofoam.com - Original Message - From: David Crutchley [EMAIL PROTECTED] To: soaring [EMAIL PROTECTED] Sent: Friday, December 17, 1999 8:50 AM Subject: [RCSE] midair I checked with a friend at the NTSB, it is not a hoax. David RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Gravity in Action
This is from Wally Scherer.
This guy writes for Sports Illustrated. VERY funny!
On a Wing and a Prayer, by Rick Reilly
Now this message for America's most famous athletes: Someday you may be
invited to fly in the backseat of one of your country's most powerful
fighter jets. Many of you already have -- John Elway, John Stockton,
Tiger Woods to name a few. If you get this opportunity, let me urge you,
with the greatest sincerity
Move to Guam. Change your name. Fake your own death. Whatever you do,
do not go. I know. The U.S. Navy invited me to try it. I was thrilled. I was
pumped. I was toast! I should've known when they told me my pilot
would be Chip (Biff) King of Fighter Squadron 213 at Naval Air Station
Oceana in Virginia Beach.
Whatever you're thinking a Top Gun named Chip (Biff) King looks like,
triple it. He's about six-foot, tan, ice-blue eyes, wavy surfer hair,
finger-crippling handshake -- the kind of man who wrestles dyspeptic
alligators in his leisure time. If you see this man, run the other way.
Fast. Biff King was born to fly. His father, Jack King, was for years the
voice of NASA missions. ("T-minus 15 seconds and counting"
Remember?) Chip would charge neighborhood kids a quarter each to hear
his dad. Jack would wake up from naps surrounded by nine-year-olds
waiting for him to say, "We have a liftoff."
Biff was to fly me in an F-14D Tomcat, a ridiculously powerful $60 million
weapon with nearly as much thrust as weight, not unlike Colin Montgomerie.
I was worried about getting airsick, so the night before the flight I
asked Biff if there was something I should eat the next morning. "Bananas,"
he said. "For the potassium?" I asked. "No," Biff said, "because they
taste about the same coming up as they do going down."
The next morning, out on the tarmac, I had on my flight suit with my name
sewn over the left breast. (No call sign -- like Crash or Sticky or
Leadfoot -- but, still, very cool.) I carried my helmet in the crook of my
arm, as Biff had instructed.
If ever in my life I had a chance to nail Nicole Kidman, that was it. A
fighter pilot named Psycho gave me a safety briefing and then fastened me
into my ejection seat, which, when employed, would "egress" me out of the
plane at such a velocity that I would be immediately knocked unconscious.
Just as I was thinking about aborting the flight, the canopy closed over me,
and Biff gave the ground crew a thumbs-up. In minutes we were firing nose
up at 600 mph. We leveled out and then canopy-rolled over another F-14.
Those 20 minutes were the rush of my life.
Unfortunately, the ride lasted 80. It was like being on the roller coaster
at Six Flags Over Hell. Only without rails. We did barrel rolls, sap
rolls, loops, yanks and banks. We dived, rose and dived again, sometimes
with a vertical velocity of 10,000 feet per minute. We chased another F-14,
and it chased us. We broke the speed of sound. Sea was sky and sky was sea.
Flying at 200 feet we did 90-degree turns at 550 mph, creating a G-force of
6.5, which is to say I felt as if 6.5 times my body weight was smashing
against me, thereby approximating life as Mrs. Colin Montgomerie.
And I egressed the bananas. I egressed the pizza from the night before. And
the lunch before that. I egressed a box of Milk Duds from the sixth grade. I
made Linda Blair look polite. Because of the G's, I was egressing stuff
that did not even want to be egressed. I went through not one airsick bag,
but two. Biff said I passed out. Twice.
I was coated in sweat. At one point, as we were coming in upside down in a
banked curve on a mock bombing target and the G's were flattening me like a
tortilla and I was in and out of consciousness, I realized I was the first
person in history to throw down.
I used to know cool. Cool was Elway throwing a touchdown pass, or Norman
making a five-iron bite. But now I really know cool. Cool is guys like Biff,
men with cast-iron stomachs and Freon nerves. I wouldn't go up there again
for Derek Jeter's black book, but I'm glad Biff does every day, and for less
a year than a rookie reliever makes in a home stand.
A week later, when the spins finally stopped, Biff called. He said he and
the fighters had the perfect call sign for me. Said he'd send it on a patch
for my flight suit. What is it? I asked. "Two Bags."
Don't you dare tell Nicole.
RCSE-List facilities provided by Model Airplane News. Send "subscribe" and
"unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Kicker toxic?
On my bottle of CA Accelerator It sales Warning: Combustible Liquid; Contains synthetic hydrocadeons and aromatic amine. Use with adequate ventilation. Avoid prolonged breathing of vapors. Do not induce vomiting if ingested. In case of eye or skin contact, flush with water. Keep out of reach of children. So I would say that it would be harmful toxic. The first time I used Thin CA with an Accelerator Was on two long pieces of 1/8 " sq hardwood. When I added the Accelerator, it looked like it was going to explode. It started popping, pouring out smoke, and a lot of little white like worms came out from between the hardwood. I thought it was going to burst into flames. The Accelerators on the market now, will not do this any more. The older Accelertors where very hard on you. The vapors would make my eyes, lungs burn. The new Accelerators don't. CA is not very good when exposed to water. It is not one of the recommended uses. I have had a friend say the baking soda works to make the CA set-up faster. But I have never tried it. Howard Rudy Salt Lake City, Ut. Bill Swingle wrote: Every time I use CyA accelerator, "kicker", I wonder what's in it and if it's harmful. What are the chemicals in "kicker"? Are they harmful or toxic? Bill Swingle [EMAIL PROTECTED] Pleasanton, CA p.s. Is there any truth to the rumor that plain water can be used as an accelerator? RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Diodes for dual battery packs on motors
Here are to sites that have schottky barrier diodes. http://www.mouser.com/psearch.cfm?keyword=1n5821MaxPerPage=25OpType=andCFID=447663CFTOKEN=39075127 http://www.digikey.com/scripts/US/DKSUS.dll?Detail?Ref=39625Row=4135 If you are going to use any diodes to run two battery packs on a Rx, get use schottky barrier diodes. A normal rectifier diode has a voltage drop from 0.95 volts to 1.25 volts. And if you use a schottky diode, their voltage drop is 0.35 v to 0.7v.. For a 1N5821 it's (Vf 0.40V @ If 3.0A Prv 30 V). The schottky diodes are use across the elec. motors on cars the don't have reverse. They suppress the reverse emf the can burn out speed controllers. The cathode or band end is hooked to the plus side of the motor the other end goes to the minus side of the motor. The Capacitors that are add to the motor to suppress RFI should be not bigger than 0.1 mf. With the high frequency speed controllers using bigger caps. can waste a lot of power in the caps. Using 1.0 mf or bigger could over heat or burn out the controller. You need three caps., one across the plus and minus of the motor. One from the plus to the case of the motor. One from the minus to the case. One more tip for winch owners, if you put a big diode across the winch motor you can cut down the arcing that welds the solenoids contacts. CH Sales 800-325-9465 has or did have some dual schottky diodes 200 Amp Prv 160 V Stock # PD9851 for $3.50 That would work good. Howard Rudy Salt Lake City, Ut.
Re: [RCSE] 5 minute epoxy
Hi Most 5 min epoxies don't have as much strength as 30 60 min epoxies. But most of the epoxies from the Hobby Shops are for general purpose applications. I like to use Hysol Adhesives they have epoxies for specific use. But their are other ones that are good too. R. S. Hughes http://www.rshughes.com/ Has stores all over the USA and carry several brands. Howard Rudy Salt Lake City, Ut. Dexter Corp., Hysol and Frekote Products http://www.dextor.com/ Dexter Adhesive Systems http://www.dexteraero.com 2850 Willow Pass Road, P.O. Box 312 Bay Point, CA 94565-0031 Tel: 1-925-458-8000, Fax: 1-925-458-8030 Loctite http://www.loctite.com/ 1-800-562-8483 1001 Trout Brook Crossing Rocky Hill, CT 06067-3910 Phone: 1-860-571-5100 Fax: 1-860-571-5465 Devconhttp://www.devcon.com/ ITW Devcon (U.S.A.) phone: 1-800-933-8266 fax: 1-800-765-4329 System Tree http://www.systemthree.com/ 1-800-333-5514 PO Box 70436 Seattle, Wa. 98107 West System http://www.westsystem.com/ Gougeon Brothers, Inc. 100 Patterson Ave. P.O. Box 908 Bay City, MI 48707-0908 Orders: 1-517-684-6881 fax 1-517-684-1374 Tech: 1-517-684-7286 fax 1-517-684-1287 Here is a list of some of Hysol's products Fast Cure Epoxies 608: Fast cure, low viscosity, clear epoxy. 609: Fast cure, low viscosity, ultra-clear epoxy. 615: Fast cure, gap filling blue paste epoxy. High Performance Epoxies 9460: General Purpose, high performance, non-sag gray paste. 9460F: Faster cure version of 9460. 9430: High strength, ultra high peal, light paste epoxy. 9433: High strength and peel, self-leveling paste epoxy. General Purpose Epoxies 1C: General purpose, gap filling non-sag white paste. 1C-LV: A lower viscosity version of 1C, tan color. 6C: General purpose, non-sag gray paste. 0151: General purpose, clean epoxy. 9462: Lower viscosity 9460. Beige color. 143: Impact resistant, non-sag cream epoxy paste. High Temperature Epoxies 9437: High temperature and chemical resistance. Gray paste. 9432NA: One part, high temperature resistant, non-sag epoxy paste. Potting Epoxies 9411 Black: Low viscosity black potting epoxy. 9412: Low viscosity, high peel epoxy. Pink color. 9412 Black: Black version of 9412. Polyurethanes 610: High peel polyurethane adhesive with superior low temperature performance. Methacrylates H300: High strength, non-sag methacrylate. Brown color. H320: Ultra high strength, non-sag methacrylate. Amber color. H440: High performance, self-leveling methacrylate. Cyanoacrylates Superdrop I (1EC-5/IEC-90/IEC-1500/IEC-2500): rapid curing cyanoacrylate adhesives. Available in 5, 90, 1500 or 2500 centipoise formulations. Superdrop II (2C-5C/2C-100/2C-500): cyanoacrylate adhesives insensitive to difficult substrates. Available in 5, 100 or 500 centipoise formulations. Superdrop III (3C1-100/3C1-1000): cyanoacrylate adhesives that offer high impact resistance. Available in either 100 or 1000 centipoise formulations. Superdrop III (3ST-5/3ST-100): cyanoacrylate adhesives that offer high temperature resistance. Available in either 5 or 1000 centipoise formulations. EVA ADHESIVES Hysol 1X: Hysol 1X is a medium fast setting EVA based adhesive recommended for porous substrates, such as, paper, wood, fabric, non-wovens, and foam. Hysol 232: Hysol 232 is a medium setting EVA based adhesive exhibiting high viscosity and film elongation and is recommended where clear, tough, flexible hot melt is needed. Hysol 740: Hysol 740 is a fast setting EVA based adhesive recommended for packaging applications. Hysol 1942: Hysol 1942 is a medium setting EVA adhesive used extensively in general purpose applications. It exhibits excellent adhesion to wood and many plastics, such as nylon, polycarbonate, PVC, polystyrene, ABS, and acrylic. POLYAMIDE ADHESIVES Hysol 7802: 7802 is a tough, flexible, high performance polyamide hot melt with excellent adhesion to many difficult to bond substrates. It shows excellent performance over a broad temperature range. Hysol 7804: 7804 is a tough, elastomeric, high performance polyamide hot melt with excellent impact resistance at low temperatures. It is recommended for demanding applications where substrates may be exposed to temperature extremes. 7804 bonds to many difficult substrates including: metals, plastics, wood, leather, fabric, non-woven fabric, films, and foils. Hysol 7804FRM-HV: 7804FRM-HV is a tough, elastomeric, high performance polyamide hot melt with excellent impact resistance at low temperatures that has been modified with fire retardant materials. It is recommended for demanding applications were substrates may be exposed to temperature extremes. 7804FRM-HV
