Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

OS .46 LA Challenge

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Old 12-19-2006, 04:40 PM
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AGR413
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Default OS .46 LA Challenge

Hey guys I thought this might be fun. Lets design an inexpensive, easy to build, speedy plane around this engine.
No particular reason but I bought one from a guy for $15 bones and I keep looking at it sitting on the workbench.
It was all gummed up and I have cleaned it up and it is a runner. This is an inexpensive engine and who knows it might help some other folks who want to try speed on for a change.

Here is what I am thinking (rough guidelines):

1. Should incorporate good slow speed handling (no nasty tip stall characteristics).
2. It should look as cool as possible!
3. Target top speed at 80-90 Mph.
4. Build should be easy and inexpensive, i.e. standard servos etc. (what do you guys think spad or no spad, I vote no spad).
5. Flight time around lets say 8-10 min.

Let me know if your up for the challenge!

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Old 12-19-2006, 08:40 PM
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pdxpaul
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Default RE: OS .46 LA Challenge

I remember a similar challenge a few years back. Essentially, it was who could design and build the fastest plane around a low cost, plain bearing 40, the OS LA or FP if I recall correctly. The rules were minimal. Your goal of 80-90 mph should be easy with an LA 46 (we are around 90 mph with our LA 15 powered club racers). Paul
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Old 12-20-2006, 12:02 PM
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Default RE: OS .46 LA Challenge

Thanks Paul, I guess I know how the guy selling manure for fertilizer feels now Lonely and alone, with his dog and a .46 LA. LOL
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Old 12-20-2006, 05:28 PM
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Default RE: OS .46 LA Challenge

Get a Viper or Predator pylon racer. They are in the $110-120 range. They are light, easy to fly, land slowly, do plenty of acro and will probably be as fast as you like.

You could also put a conventional tail on it.
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Old 12-20-2006, 06:14 PM
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Default RE: OS .46 LA Challenge

If you like to build (since you want to do a scratch design), a Lanier Dominator 500 costs $60 direct. Build it light and clip a few inches off each wing (the 46LA is a light engine) and it will be plenty fast and entertaining. Cheap, simple and very easy. Not an original design, however...


Mark
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Old 12-20-2006, 06:34 PM
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Default RE: OS .46 LA Challenge

How can an airplane that flys 80 or 90 be considered a speed plane? The AMA even considers any airplane that flys under 100 mph as a candidate for night flying (as in low performance).
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Old 12-20-2006, 06:35 PM
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Default RE: OS .46 LA Challenge

I guess it can't, feel better now, I stand corrected.
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Old 12-20-2006, 06:45 PM
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Default RE: OS .46 LA Challenge

I think that the general idea has merit, of using an cheap sport engine and seeing how much can be achieve. A stock quickie will do about 90 mph with just a .25 BB engine, while with a TT .40 120+ mph seems the norm with a stock engine. Clipping down a quickie's wings and a bit of clean up with the .46 should also run above 120.
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Old 12-20-2006, 10:31 PM
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Default RE: OS .46 LA Challenge

I've got a Sonic and a 46LA laying around, I think I'll give them a try.
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Old 12-21-2006, 10:41 AM
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Default RE: OS .46 LA Challenge


ORIGINAL: HighPlains

I think that the general idea has merit, of using an cheap sport engine and seeing how much can be achieve. A stock quickie will do about 90 mph with just a .25 BB engine, while with a TT .40 120+ mph seems the norm with a stock engine. Clipping down a quickie's wings and a bit of clean up with the .46 should also run above 120.
Yep... that would be my quick and dirty approach. The 46LA on a "scooter II" type airframe (46" span scat cat). Cheap, easy, and easily 100 mph+ with a 9x6 prop and its stock muffler.

Always fun to design something quick.
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Old 12-21-2006, 09:41 PM
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Default RE: OS .46 LA Challenge

The 40 La on a equivlent size plane will be a real "piece" but on a little predator or similar should be a hot little plane.
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