Hey guys, I have a Hacker B40-4:1 plant in my Wattage Crazy eight right now that I want to take out and use it for a 3D type foamy. Do you think that this would be to big or heavy of a motor. I was thinking of doing a bigger plane for it. Cost a ton for the right Li poly set up. but i think it could be done, what do you folks think?

Hi

I got a B40 too... which wind do you have? also is it a S or L? factory mounted 4,4:1 gearbox?

a B40 performs as a 72 4 stroke, I use mine in a Kyosho CAP232 40 size, on 10 round cells. hovers and pulls out!

previous I had it in a diablotin mini usper, very good power/weight ratio.

I would suggest an E3D, www.gwmp.net

it's a 18S with a 4,4:1 pant gearbox from hacker. I would also like to go with Li cells. I want run times of at least 10 mins.

Hi

a 18S...hm useing 4s2p thunderpower you would get a very light ship, and about 2,2kg thrust. 14x7 APCE or so.

make sure to get proper cooling as you can expect 20min + flight times. maybe even a heatsink! www.aircraft-world.com

2.2 kg thrust?
Isn't 5kg 11 lbs?
What foamie fits this?

Hi

sure, 1lb = 0,454kg where did you get the 11lb from?

I did a lot of FAI powered stuff - and 11 lb is the weight limit - (5 k)

I still don´t see the point []

[link=http://www.jr-models.cz/english/letadla/jr303.html]http://www.jr-models.cz/english/letadla/jr303.html[/link]

Point?
I only wondered at the size of the "foamie "- It seemed it would ne largeer than any foamies I have seen.

You could build a foamy for the B40, but it wouldn't fly as well as a built up plane.
I've built a couple of 48" span foamies for glow power. This is with 1/2" thick Foamular pink color high density insulation from the local hardware store.

If you used anything thiner than that, such as the popular 6mm Depron you would have to do a lot of reinforcing and probably also have to use "flying wires" attached between a pylon and the wing for enough strength.
The flat plate airfoil does ok on the small lightweight planes, but IMHO with a bigger heavier plane it just doesn't work out for electric flight. You need a good airfoil that will allow the plane to fly slower.

Bill

i think your right. have to go another direction i think.