40'' extra 300 - RC Groups
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Jan 26, 2011, 11:46 AM
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40'' extra 300

ok i hope i can get the help i need in this forum.im busy restoring/fixing this TWM extra 300

Wingspan 40.5 in / 1030 mm
Wing Area 288 sq in / 18.6 sq dm
Flying Weight 26.5 oz / 750 g
Fuselage Length 34.5 in / 880 mm

the manual recomends a 2100mha lipo with a 20a esc and a 28/30 kv 1015 180w outrunner with a 10x5 folding prop.

i want to put a glow engine of between .15 to .25 on this plane(not into elec at the moment)but i want to retain the 3d capabilitys.which size prop would i be able to use?i'm afraid if i use the recomended engine props that they would be too small and to fast.any help is great.thanks
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Jan 26, 2011, 07:47 PM
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RedStarArmy's Avatar
10x5 would be too big. I have an older .25 and it can keep up with a 9x6, but just barely, maybe 9x5 or 8x6 would be better. For 3D I guess you can start with a 9x5, but it depends on the engine.
Jan 27, 2011, 03:26 PM
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Ok great.Do you think I'd be better off with a 0.40 engine or would that affect the weight to much with the tank an all?
Jan 27, 2011, 05:26 PM
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RedStarArmy's Avatar
I just noticed flying weight is advertised at 26oz. A .25 or even a .15 is probably too much I would think. I have a .25 is a 5 pound plane. Looks like this plane is only designed to be electric, so even if you wanted to put in a glow engine, you'd have to do some reinforcing. Your best bet is to figure out which electric motor you would but in there, and then find an equivalent glow motor with similar thrust ratings...but this plane is far smaller then I have dealt with so maybe someone else can chime in.
Jan 28, 2011, 12:47 AM
Registered User
Thanks man.I guess its about time I got some electric equipment togather to do things right.That was my big concern,taking a otherwise innocent,nice looking plane and turn it into a brick.thanks for your input.

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