The Natural Philosopher wrote:
> Tim Wescott wrote:
>> I'm contemplating building a model of the Aeronca LA, LB or LC. This
>> critter has a 9:1 aspect ratio and a 70HP engine, so it's more or less
>> a Cub pretending to be a low-wing s****t plane.
>>
>> I'd be putting an OS MAX .25 in it, or an equivalent electric motor.
>> For scale-like slow flying, I keep circling back to a 1/6 scale, 4-5
>> pound aircraft with a 6' wingspan (and about 4 square feet of wing
>> area). This seems BIG for a .25, yet I know that the SIG 1/6 scale
>> cub comes with a recommended .25-.40 engine range -- and there's
>> something silly about a Cub model flying rings around a big heavy P-51.
>>
>> So, what Cub (or other light plane) models have you flown, how big
>> were they, how heavy were they, what engine did you use, and (most
>> im****tant) how did you like flying the thing?
>>
>
> plenty of 5 footers flying on 150W or less. About 2cc or a 0.15 in old
> money.
>
> 5lb would need at most 250W at teh right prop to fly well..that's about
> a .20
>
> I don't do gassers but thats where an opverpropped 30-36 4 cycle would
> seem to be perfect.
>
If I were to go up in displacement it would be so I could swing a larger
prop -- scale size would be 12 or 13", while the engine I have 'wants' a
10x4 or 9x5, and may not have the oomph if I sacrificed some power to
the Big Propeller Gods.
Or I may go electric -- it's just that I keep winning these gallons of
fuel at the club raffle, and a .25 doesn't use much, particularly since
I don't fly a whole bunch.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
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"Applied Control Theory for Embedded Systems" gives you just what it says.
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