R: [RCSE] Computer Radio Recommendation
From: Mario Marzocchi ( Florence- Italy ) ___ ! [EMAIL PROTECTED] --( )- http://users.iol.it/maudib If this can help You, I have MPX from 16 Years. I think it is a very good computer radio. My two 3030 and ( one ) 3010 are working for years but remember that pots last 350 hours. Change them at 300 hours. CYAOOO000oo Mario Marzocchi RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Re: potentiometers
I was surprised to hear some one say that potentiometers only have a useful life of 350 hours. This seems awfully low to me. I'd suspect that the limiting factor is not time but rather motion cycles. The limit of which I wouldn't hazard a guess. Bill Swingle [EMAIL PROTECTED] Pleasanton, CA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Stalling and speed of sound
The two limiting speeds for any subsonic aircraft is the stalling speed, where flight is no longer sustainable and the aircraft's top Mach speed, a speed relative to the local speed of sound. As you climb upward these two creep slowly close and closer, to eventually meetm and making subsonic flight impossible. But before it goes that bad you'll have a higher ground-speed if you go higher, a fact the jetliners take advantage of, of course! IC engines, like glow or ignition engines, fare badly as altitude increases, as they eventually get starved of oxygen. Those flying electric models at high altitude will notice faster flights and higher propeller revs and possibly longer endurance, but not much else to worry about. Any non turbo-charged engine will have to be continiously monitored and the needles readjusted if you plan to break any records :-)! So higher stalling speeds, higher cruise speed, and higher tops speed, if the model is a normal one. A very fast one might run into compressibilty problems at the top of Mount Everest, had you planned to take your Vindicator there :-)! Tord, Sweden -- If reply difficulties - use [EMAIL PROTECTED] Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Does Altitude cause bad air?
Maybe the guys in Reno could answer this as they fly at pretty high altitudes. I think I remember one of the guys up there telling me its not as easy to themal up there as it is in say Sacramento. But I know for a fact that area is world renowned for both thermal and wave full size soaring. They have some powerful, maybe almost violently so thermal activity up there yet I am pretty sure some of the model guys told me it is a little harder to thermal up there. Any answers to this? Walter -Original Message- From: regis white [EMAIL PROTECTED] To: [EMAIL PROTECTED] [EMAIL PROTECTED]; 'soaring' [EMAIL PROTECTED] Date: Friday, April 28, 2000 8:21 AM Subject: RE: [RCSE] Does Altitude cause bad air? Absolutely, even the U2 had altitude limits not related to the engine. -Original Message- From: GRW [mailto:[EMAIL PROTECTED]] Sent: Friday, April 28, 2000 12:51 AM To: soaring Subject: [RCSE] Does Altitude cause bad air? In talking to a friend today, he said something that made sense but I'm curious about it. Does high altitude affect lift and the way gliders fly? I know that is does for power, it sucks the juice out if the motor. But flying motorless here, is there much of a differance? I have only gotten my plane to climb well from a HL here once, 5500+ ft. I went to Salt Lake and had good flights with a couple speck'n out. Now this is also a different plane so I can't really compare, but then maybe it has to do with altitude. Could this be because of the altitude? Thanks -- Glenn R. Whitcomb Elko, NV [EMAIL PROTECTED] http://www.gbcnv.edu/~glennw 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] Does Altitude cause bad air?
Walter - Is the question does altitude cause bad air, or does attitude cause bad hair, I forget? I think I told you it was a little harder - air is thinner - plane has to fly faster to achieve equal lift (or something like that) so we make more mistakes??? We have killer hat sucking thermals at most if not all of our flying fields - however - the fatter air and slower flying speeds always makes us think it is easier to spec in say Sacotomatoes or Skysailia 8^)~ This would lead one to believe that we Renoites would all get our times and then some when we travel out of town. Let's just say that Sudwerks and The Cadillac Club often create situations where the pounding in our head overpowers the desire to fly (had to make some sort of excuse). Thermals to all, Bill Gillis Reno, NV RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Does Altitude cause bad air?
Glenn R. Whitcomb asks: ...Does high altitude affect lift and the way gliders fly? In addition to the increase in true airspeed caused by the lower air density, as discussed by Oliver Wilson, and the associated increase in sink rate and turning radius, there is also a decrease in Reynolds number. This usually reduces the max lift coefficient, and increases drag. The reduction in air density causes an increase in speed, but since lift is proportional to the square of the velocity, that speed increase is inversely proportional to the SQUARE ROOT of the air density change. Meanwhile, since Reynolds number is LINEARLY proportional to density (and because air viscosity at our altitudes is approximately constant with altitude), the change in Reynolds number follows a linear function. Therefore, the increase in airspeed due to the thinner air at higher altitude cannot compensate completely for the loss of air density, and the Reynolds numbers go lower. This usually hurts performance over the entire operating envelope, althoiugh the exact extent of that loss depends on how well the design of the specific model in question handles the decrease in Reynolds numbers. Don Stackhouse @ DJ Aerotech [EMAIL PROTECTED] http://www.bright.net/~djwerks/ RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Davenport winds/ISR
Tried calling Davenport wind talker. Its pretty windy outside but wind talker must be down as it said a big zero. I then brought up current wind conditions at Santa Cruz, a little south of Davenport and usually not as windy. Right now its at 21mph and WNW, and its only 10:30 am!- bet its much better than that at Davenport. Hope its like this next weekend- if it is, racers bring your ballast as it should be tremendous at Davenport. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] CNC Foam Cutter
Congrats, Greg! Don't forget to send your price list my way! Tom Nelson Calgary, Alberta, Canada Greg Nuspel wrote: It looks like I am going to try the fishing leader. I have a cutting = machine but it is a little different than the feather cut. My test so = far have shown that the wire tension is not a big problem since the = machine works at a higher temperature and the wire doesn't touch the = foam. The first test have shown that the cord length over a 4 in cord = was 0.020" short. So once I have all the offsets properly programmed it = should be perfect. Tried a tapered section last night 8" root 6 1/2" tip 24" span. Came out = just wonderful next to try the sectional setup for a multi part wing. No more templates and loving it :-)) RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Davenport winds/ISR
Try http://www.iwindsurf.com/ Jerry R. Craft VWP Sho-Gun Torrey Pines Gulls Slope Coordinator SoCal USA Wk 858-320-4128 Cel 760-803-6955 Msg [EMAIL PROTECTED] (120 char) - Original Message - From: Walter Lynch [EMAIL PROTECTED] To: [RCSE] [EMAIL PROTECTED] Sent: Friday, April 28, 2000 10:42 AM Subject: [RCSE] Davenport winds/ISR Tried calling Davenport wind talker. Its pretty windy outside but wind talker must be down as it said a big zero. I then brought up current wind conditions at Santa Cruz, a little south of Davenport and usually not as windy. Right now its at 21mph and WNW, and its only 10:30 am!- bet its much better than that at Davenport. Hope its like this next weekend- if it is, racers bring your ballast as it should be tremendous at Davenport. 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] Stalling and speed of sound
If I remember correctly, when the U-2 is at altitude, the difference between its maximum design speed (VNE) and stall is only a few knots due to the density altitude. Kinda keeps it interesting for the pilot. :) Jimmy -- Designer/System Integrator for the "Vector P" UAV (http://www.ase.w1.com/vector.html) For the best in sailplane protective carrying soft packs, Airtronics, Diversity Model Aircraft, FMA, Hobby Lobby, Hitec, Multiplex, and Trick R/C go to: http://jtmodels.net or e-mail [EMAIL PROTECTED] JTModels Web Creations http://members.xoom.com/jtmodels Phone: (727) 372-5914 Fax: (727) 372-5916 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Re: RG15 - reflex?
...using reflex on RG15 ...all responses so far say reflex helps... Thanks for the comments, I'll leave the reflex programming enabled on my speed switch then... RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Does Altitude cause bad air?
I was recently flying HLG in Sedona Arizona. As I recall the density altitude was easily above 10,000 feet. I noticed a few things. First, my launches were noticeable higher. I have a pretty good launch that is completely natural (i.e.. requires no thought of technique), and very consistent. I would guess that my launches in Sedona were on average 10 feet higher than normal sea level launches. The Encore just kept going and going on the up line. I was amazed. These launches were to the moon. (No I was not channeling like all the granola flakes who commonly visit Sedona) The second thing I noticed was that the approach to hand catch was frustratingly difficult to get correct. Again, I fly enough HLG that I normally don't have to think about getting home for the hand catch. In Sedona, I was either too fast, requiring a wave-off, or I was short and failed to make it home. This drove me crazy. I normally never miss the hand catch. It's hard on the glider to land it on rocks and parking lots and stuff. This was maddening. The third thing I noticed was that the glider wasn't any harder to thermal. The disadvantage of having to fly at higher ground speeds was off-set by the fact that you were covering more ground with the glider zipping around at that higher speed. When lift was located, the glider thermalled just like normal. In conclusion, I like flying at high density altitudes (other than needing to learn to catch all over) and would like to attend a contest up in the mountains to see how others deal with the differences. Timothy E. Cone [EMAIL PROTECTED] http://www.NightOps.com - Original Message - From: "Don Stackhouse @ DJ Aerotech" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, April 28, 2000 10:39 AM Subject: Re: [RCSE] Does Altitude cause bad air? Glenn R. Whitcomb asks: ...Does high altitude affect lift and the way gliders fly? In addition to the increase in true airspeed caused by the lower air density, as discussed by Oliver Wilson, and the associated increase in sink rate and turning radius, there is also a decrease in Reynolds number. This usually reduces the max lift coefficient, and increases drag. The reduction in air density causes an increase in speed, but since lift is proportional to the square of the velocity, that speed increase is inversely proportional to the SQUARE ROOT of the air density change. Meanwhile, since Reynolds number is LINEARLY proportional to density (and because air viscosity at our altitudes is approximately constant with altitude), the change in Reynolds number follows a linear function. Therefore, the increase in airspeed due to the thinner air at higher altitude cannot compensate completely for the loss of air density, and the Reynolds numbers go lower. This usually hurts performance over the entire operating envelope, althoiugh the exact extent of that loss depends on how well the design of the specific model in question handles the decrease in Reynolds numbers. Don Stackhouse @ DJ Aerotech [EMAIL PROTECTED] http://www.bright.net/~djwerks/ 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] raptor
Does anyone know anything about the raptor from Hobby Lobby? I think this is an older plane. What is the makeup of this plane? Obeechi over foam? Thanks -- Glenn R. Whitcomb Elko, NV [EMAIL PROTECTED] http://www.gbcnv.edu/~glennw RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
