On Mon, 09 Jun 2008 11:40:47 -0700, Tim Wescott wrote:
> 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?
>
> Thanks in advance.
I had a 7' old timer ("Ol' Reliable") that weighed in at just under 4 lb
(wet) with about 6 sq ft of wing area. It had an OS .25FP, which is
about as wimpy as .25s get, and the problem was *landing* - I had the
idle a little high, and the thing would just putter along in ground
effect for the whole length of the field. If there wasn't a headwind, I
usually had to shut off the engine to get it to land.
It would do these beautiful hands-off takeoffs at about 1/3 throttle -
I'd set 1/3 throttle, put the tx down, let go of the tail . . . I sure
miss that plane.
Anyway, if you build it light, aren't looking for aerobatics, and build
it light, a .25 should be fine, as long as the plane is light.
- Mark
P.S. build it light. For example, if it's 3 channels, a 'standard' radio
with 3 std servos, 500 mah nicad, switch, and big rx will weigh about 10
oz. A small rx (say, a Berg or Spektrum) with 3 HS81s, small switch, and
a NiMH battery will weigh under 5 oz. That's 1/3 of a pound savings right
there.
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