Just remember,
Every river of lift flows through an ocean of sink.
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--- Bill Rakozy <[EMAIL PROTECTED]> wrote:
> Can you suggest a source for 48 piano-wire?
The answer is:
http://www.stevespianoservice.com/wirepart.htm
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--- Karlton Spindle <[EMAIL PROTECTED]> wrote:
> Many of you have asked about the new Multiplex Radio
Karlton, does Multiplex contemplate making a radio on 50 or 53 Mhz?
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> I can assure you there is no way that that poly can compete!
You need a Dark Star.
http://www.mvsaclub.com/articles/dark_star2.htm
> It cannot be launched anywhere near the height of
> the composites (not strong enough!)
The Dark Star and numerous other poly ships can be zoomed as hard as
--- John Gossett <[EMAIL PROTECTED]> wrote:
>...the last I saw as she descended below the hill
> crest was that she was heading for a landing in the
> trees...
> ...To get flying again, all I would have
> needed was a spare link, spare arm, and some more
> weights. But I didn't have that stuff wit
--- Graeme Andrew <[EMAIL PROTECTED]> wrote:
> Just interested if anyone has any experience with the 100" Big Bird
> from
> Sky Bench Aerotech ?
>
For our club's season championship the Big Bird was picked as the
most-desired merchandise prize. The parts fit, the design is good, and
it flies gre
The Saga of Hard Luck Gomez
At some point each of us comes to one of those moments in life that
change everything, where the future course of one's whole existence can
take this path or that, and there's no ducking it. When that moment
came for Hard Luck Gomez, he may have made the wrong choice;
--- David Shanks <[EMAIL PROTECTED]> wrote:
> Who is Chris, and where do I find these servo cans? Can they be used
> in very
> shallow wings? Thank you!
>
Check 'em out at:
http://www.scrollsander.com/Soaring-ServoCans.htm
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I bought an obechi-sheeted plane a couple of years ago. The previous
owner had glued the servos in with Zapadapagoo (similar to shoe-goo)
and generally botched the installation. The only remedy was to cut the
whole mess out in a big circle and install Chris's servo cans.
Last year I acquired anot
--- [EMAIL PROTECTED] wrote:
> Dudes
> Attending contests has simply become a matter of economics for me.
> ...guys like Anker and Tom and Phil have taken to giving me "Show"
> money
>...I can cover travel expenses and make enough
> besides
> to go out Saturday night with one of those adoring
It's no different from 25 cent skins when you're playing golf with your
buddies. It adds purpose to your flying - as much or as little as you
want to make it. It can't hurt to try to do your best in anything.
Contests make you pay more attention to detail in trimming your plane
and make you work
--- Paul Breed <[EMAIL PROTECTED]> wrote:
> Cool data,
> what does your simulation predict for minimum sink for these
> aircraft?
For my hypothetical 3M plane, minimum sink at 10 oz./sq ft is 1.2
ft/sec. That's at an airspeed of about 17 - 18 mph.
___
--- Anker Berg-Sonne <[EMAIL PROTECTED]> wrote:
> Flying at max L/D is great when looking for thermals in relatively
still air.
> However, where flying at best L/D is really, really important is when
you
> are trying to return to the field from downwind in a stiff breeze, or
a
> howling hurrican
--- silentfilght <[EMAIL PROTECTED]> wrote:
> Would anyone happen to have plans for building a winch?
You can get nice ones at:
http://members.aol.com/laserartco/page13.htm
Be sure you have your speakers on when you access the page.
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Re still-air times:
Suppose that you can launch to 600 feet (pretty good for still air with
a 600 foot line). If your plane's loading is 9 oz/sq ft, at a CL of 0.9
it will fly 23 ft/sec. Therefore if the L/D at that speed is 23 the
sink rate will be 1 ft/sec. That's 10:00 from 600 feet.
BUT -- t
--- Rick Van Clief <[EMAIL PROTECTED]> wrote:
> Shouldn't the thicker carbon go on top? Carbon being poorer in
> compression
> than in tension and all.
Yes. Carbon uni has compression strength of, say, 100k psi but strength
in tension is double that or more. Typical carbon spar arrangement for
--- Art Mcnamee <[EMAIL PROTECTED]> wrote:
> Some are afraid to fly the RG15 as they say it won't thermal. They
> are wrong.
Yep. RG15 is a great thermal airfoil. In fact, an RG15-equipped Pike
won the F3J WC if I remember right.
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For the answer to these and many other questions, see:
http://www.nasg.com/afdb/list-polar-e.phtml
--- Zbigniew Michalczyk <[EMAIL PROTECTED]> wrote:
> Hello Everybody!
>
> looking for
>
> AOA @ zeroCl for S3010
>
> and any other data like
> polar curve
> Cm
>
>
> is there any web site
for airfoil plotting and rib or core templates, nothing beats compufoil
(http://www.compufoil.com/). For airfoil design and analysis, nothing
beats xfoil (http://raphael.mit.edu/xfoil/)
--- [EMAIL PROTECTED] wrote:
> Hi there,
> Does anyone know where to ethier buy a good airfoil progra
--- "Don Stackhouse @ DJ Aerotech" <[EMAIL PROTECTED]> wrote:
> Switches in general are also passe these days...
This seems particularly applicable on higher power systems. If the
resistance of your switch plus leads is only .002 ohm and your motor is
drawing 50 amps, the voltage drop across th
As always, Chuck knows what he's talking about (see below)! If you had
the old spot landing task, RES ships would be fully competitive in
Unlimited, at least in the hands of a good flyer. This would open up a
lot of interesting possibilities for design improvements, potentially
bring in some new b
The Challenger is a great-flying plane if you're a good flyer. I
haven't seen the Skybench kit of the Challenger, but Skybench stuff is
top-notch; all of it bears the stamp of Ray Hayes, master craftsman and
expert flyer. Ray flew his Challenger for the first time at the Nats in
Nostalgia, and aft
Do it! Design and build an RES plane with all the knowledge that has
accumulated and all the new materials and techniques available since
the heyday of the nostalgia planes. You'll have a great-flying plane
and a lot of fun!
--- Bob Johnson <[EMAIL PROTECTED]> wrote:
> There is a class in which
Ah Jim, great post! I'm an RES partisan and a lover of cruciform tails,
but for long-term impact on the sport I'd say that there were three
biggies: DS, sidearm, and the release of Xfoil into the public domain.
And ya know, three big developments in a single year is pretty cool!
> What was the
Lee Trevino's other law is: You CAN use your 1-iron in a lightning
storm, because even God can't hit a 1-iron.
--- "Tom H. Nagel" <[EMAIL PROTECTED]> wrote:
> This is known as Lee Trevino's Law : "don't stand at the highest
> point
> holding a metal rod over your head when there is lightning aro
My mention of Fults Hill drew some queries. It's a public park in rural
Illinois about 45 minutes from downtown St. Louis Mo. South on Rt 3 to
Waterloo, right on 156, make hairpin turn at abandoned gas station onto
Bluff Rd., past village of Fults, look for sign on right that sez Fults
Hill. Hike
A couple of others who I haven't seen mentioned yet are Hobby Club
(www.hobbyclub.com), distributors of various imported moldies, and rnr
(http://www.rnrproducts.com/airframes/gliders/glider3.htm), U.S.
manufacturers.
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Make interna
--- Jason Werner <[EMAIL PROTECTED]> wrote:
> You see, Joe is getting a little older. So he felt a
> little
> "safer" plane is better for him. One that is a little bigger...
Since I'm twice as old as Joe, I'm going for a plane that's twice as
big.
__
Just remember, all you guys, that Brian can beat the stuffing out of
just about everybody on here.
--- "Andrew E. Mileski" <[EMAIL PROTECTED]> wrote:
> Brian & Iva Smith wrote:
> >
> > ThanksHave done all that, except last one..How do you get a max
> when
> > your having to fly in close
--- Bill Harris <[EMAIL PROTECTED]> wrote:
> I noted that the TWO 5/32" rods
> have the
> same cross-sectional area as the ONE 1/4" wingrod.
2 5/32" rods have a combined cross-sectional area of 0.0383 sq in, and
a single 1/4" rod has a cross-sectional area of 0.0491 sq in. If you
can obtain 9/
--- Bill Harris <[EMAIL PROTECTED]> wrote:
> how do you calculate the winch load from the speed
> of the
> plane?
>
> --Bill
>
The lift on a wing is:
L = (.00237/2) * CL * S * V^2
where .00237 = density of air
S = area in sq ft
V = velocity in ft/sec
CL = coefficient of lift, which during th
--- Bonfiglio Tullio <[EMAIL PROTECTED]> wrote:
> Hi, guys,
>
> Has any of you ever tried to build and use a composite wingrod ? By
> "composite" I mean a rod made by a carbon tube with a steel bar
> (closest
> diameter) epoxied inside, sorta of "case hardened steel".
> Is the reverse (steel tub
This is an outstanding and admirable design embodying a lot of
knowledge and good ideas. Have a look, everybody! Thanks to Chris for
the pix and plans, and as always thanks to Joel and Charles River for
disseminating this cool and valuable info.
--- "Joel A. Foner" <[EMAIL PROTECTED]> wrote:
> C
Before you put the tape on, put a strip of carbon tow across the joint
along top and bottom of the sheeting in line with the spar. This helps
quite a bit with the stiffness of the joint.
--- Bill Harris <[EMAIL PROTECTED]> wrote:
> I would suppose that the reinforcment needs be be strongest on
Well Bill, you already know my response: what you refer to as option 2
is worth it becuz it is stronger, lighter, and easier to build. I've
done it both ways and I'll never go back to option 1. I'd be interested
in others' experiences and comments. The difference between Mark's spar
and mine is th
I worry about the same thing, but FMA 6 meter receivers work fine as
far as I can tell. I don't think they have either an AGC or RF stage,
but I've never had any trouble and Tom Hoopes who has some fancy test
eqpt and the inclination to do the world a service has given them his
seal of approval. I
ence (at least on the channels I fly). Your mileage
> may vary.
>
> Tom
>
> - Original Message -
> From: "Len Revelle" <[EMAIL PROTECTED]>
> To: "tony estep" <[EMAIL PROTECTED]>; "James V. Bacus"
> <[EMAIL PROTECTED]>
In the true spirit of RES we should all attempt to emulate the great
Otto Heithecker. I have a vivid memory of Otto's mighty 12' Challenger
barreling toward the landing spot, touching down at the far edge of the
circle that they used in those days, and sliding toward the bulls-eye;
at the crucial
I have a couple of T-tail Prisms with RG-15 airfoil. They fly great and
are still quite competitive in TD (no slopes around here). The only
negative I would mention is that mine have 3/8" steel wing rods which
are rather short -- they only stick into the wing about 5". Therefore
I'm pretty sure th
cg location depends on a bunch of things, but for the purposes of
modelers the best idea is to make a lot of simplifying assumptions, use
a shorthand formula, and then adjust by flight trimming.
Howard Chevalier offers a workable rule of thumb (Model Aerodynamics,
p. 109)
neutral point = locatio
Suppose that a few years ago somebody said, "It'd be neat to have a
plane you could throw 150 feet high, one that weighed only 9 ounces but
would withstand launch speeds of 100 mph, one that would thermal, roll,
do an outside loop, and stop dead in the air -- well, I guess that's
pretty far-fetche
Our club has sponsored an ARF-only class. The Spirit ARF is indeed a
good plane for beginners. If you can tolerate a 1-piece wing, you can
glue the joiner in and fiberglass the joint, which gives a pretty
strong wing. Once launched, it thermals well, is very hard to tip
stall, and generally is wel
Make it 5 bends. Figure your effective dihedral angle as explained at
http://www.rc-soar.com/tech/spiral_eda.htm
Make it about 9 degrees. If you want a really heavy-duty analysis, get
Blaine Rawdon's design spreadsheet from [EMAIL PROTECTED] and figure
out the right combo of effective dihedral plu
try
http://www.charlesriverrc.org/articles/construction/noseconesmadeeasier.htm
and let us know if it works.
--- "Douglas, Brent" <[EMAIL PROTECTED]> wrote:
> anyone ever do this without using a 2 piece approach? eg, can you
> mold a
> nosecone on the end of a plug and hope to get it off in 1 pi
If you haven't already, be sure to check out http://www.skybench.com/
where there are numerous pix of various flavors
--- "Andrew E. Mileski" <[EMAIL PROTECTED]> wrote:
> I've scoured the net for pictures of the Bird of Time and its
> cousins like the Big Bird and Lil'Bird, but I couldn't find ma
And Mark Smith flew the seagulls in the movie Jonathan Livingston
Seagull.
--- [EMAIL PROTECTED] wrote:
> There are several others who have done movies, way back. Back in the
> early 1970's
> Russ McCracken of the SFVSF at Pierce College did the Glider for the
> movie "The
> Birdmen" about a gr
YMMV!
--- "Cottrill, Flash" <[EMAIL PROTECTED]> wrote:
> After 35 years of motorcycling it seem that one major accident for
> every
> 10,000 miles ridden is a good (bad) average.
>
> Gordon.
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Yahoo! Auctions - buy the things you
Fly in the Gateway Open (near St. Louis) June 9 - 10 and have another
shot at MVSA's own Nelson Itterly, winner of RES at the TNT, and maybe
also at Jeff Naber, 2nd in Unlimited at TNT.
Getcher registration forms and other info at
http://www.mvsaclub.com/soapp.pdf
__
Check out
http://www.cstsales.com/SparBuilding.htm
and http://www.favonius.com
--- [EMAIL PROTECTED] wrote:
> Can someone give me sites with techniques/tips to use CF or GF spars
> in foam
> sheeted wings?
>
>
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The sinking speed in a turn = straight line sinking
speed / (cos(theta)^(3/2)) where theta is the bank
angle -- provided that the L/D for a given angle of
attack is the same while circling as when flying
straight. Straight line sinking speed, in turn, is
forward speed / (L/D). Now if you're flying
Ok, I grant you that the Allegro has a good margin,
and that circling CL is, let's say, 0.7 - 0.8.
But I'm still wondering about, let's say, a Bird of
Time, which has a short tail moment and EDA < 10, or a
Grand Esprit which has a very low EDA -- and of course
there are others.
For these plane
Glide speed in ft/sec = sqrt(loading in lbs/sq ft /
(2/(CL*.00237)))
For a typical HLG, CL when you're flying slowly might
be about 0.9. For a 10 oz plane with 350 sq in area
flying at CL = 0.9, glide speed turns out to be about
15 1/2 ft/sec.
__
Compufoil figures it out for you in Planform view.
--- Bill Swingle <[EMAIL PROTECTED]> wrote:
> Calculating the mean geometric chord (MGC) is where
> a CAD program becomes very
> helpful.
>
>
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Suppose one guy holds the pulley and the other the end
of the line, and they run in opposite directions?
--- Les Grammer <[EMAIL PROTECTED]> wrote:
> Off of the FAI exchange came the following
> announcement:
>
_
>
> British Association
Andrew is right. You can't close the spoilers by
pushing on a string. I close my spoilers with magnets
(available at Radio Shack). The whole setup is
somewhat heavy and old-fashioned but very easy to
build and absolutely foolproof to adjust. The spoilers
close exactly right every time with a satis
The Mississippi Valley Soaring Association
(WWW.MVSACLUB.COM) is trying to get the membership to
check the info on the website regularly. We post the
newsletter there, along with other club stuff and
items of general interest (check it out).
However, we definitely intend to keep sending out hard
check out the following page:
http://www.mvsaclub.com/seethrmal.htm
On it there is a scheme for a cool club project, and a
challenge to see which club will be the first to come
up with a thermal detector. The rules are simple:
no prizes, just bragging rights;
any club, U.S. or otherwise, is elig
Well, at the very least we should band together and do
the following: ask all the mfrs to release and swear
to their specs for bandwidth at -6 and -60 db,
sensitivity for 10 db s/(s+n), current drain, low
voltage limit (and maybe more that others more savvy
than I might propose). Maybe we could st
Ain't it a pleasure to get some commentary based on
empirical and valid tests?! Thanks, Tom.
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