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Power requirements for a small Tiger Moth

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Old 10-19-2018, 07:49 AM
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Default Power requirements for a small Tiger Moth

I found a deal for a pretty snazzy lookin' 980mm span Tiger Moth kit on Banggood, balsa and ply construction, that I'm thinking about picking up and building. Given it's made of balsa-and-ply and that I have a strict 'if it's big enough for ICE it gets ICE' policy regarding my aircraft models, I'm planning on going nitro with it.

I'm thinking of using a throttleable Cox 0.049 from coxengines.ca for it. Is that gonna be enough power? Or should I step up a bit and get an OS 15LA for it? I don't want so much power that I could 3D with it or set airspeed records, but I want enough power that 1/2 to 3/4 throttle is a lovely cruise speed while leaving enough in reserve for the occasional loop and/or aborting a dud landing. Also want to be able to take off from the ground on its own rather than relying on handlaunches.
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Old 10-19-2018, 12:12 PM
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I think you are on track with the 25 LA. Bipes tend to require a bit more power then monoplanes. I have a 70 bipe that flies really well with 70cc of engine.
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Old 10-27-2018, 09:00 AM
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The banggood page says that plane is meant to fly on a 2212-2216 motor. Himax says their 2212 is the equivalent for a .040 glow engine. So the Cox may work well. You might check into the weight of the bigger engines to see what kind of factor that will be.
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Old 10-27-2018, 06:57 PM
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It weighs around 20 to 25 oz so a Cox o49 will not fly it.
An OS 15 LA on a 8 x 3 should do the job.
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Old 10-27-2018, 07:34 PM
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A very long time ago I built a Pitts Special using a couple Ace foam wings. Span was about 40" and I powered it with a K&B 3.5cc ( .21 ) and ran a 9x4 Rev Up prop. Weight was around 2.5 lbs. Pretty much had just the right amount of power. Quite the handful though, no dual rates or expo back then.
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Old 10-27-2018, 07:37 PM
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Originally Posted by j.duncker View Post
It weighs around 20 to 25 oz so a Cox o49 will not fly it.
An OS 15 LA on a 8 x 3 should do the job.

Or if your runway sits at 5000' like mine you might want a touch more power.....

there is always the throttle

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