33% electric edge

[bill clark]

I bought this plane,101"/26+- lbs
http://www.xtremecomposite.com/full.asp?id=3
and was wondering about electric for power. is there any advantage? how much battery would I need to get equal performance to a 100cc gas? seems like it would end up heavier if i had to use more than 15 cells. what kind of flight time could one get out of such a system. if someone could offer some general answers I would be most thankful. I have plenty of electric experience (up to 2000w)but not at this level

[hcuellart]

Hi we are on the same boat here. I am doing mine at the moment. here is the link to the thread:
Extreme Composite Edge 2.6m (http://www.rcgroups.com/forums/showthread.php?t=1039765)
Which scheme did you get?
If I can help in any way please ask...
Best regards,
Homero

[blnk00]

Well I just completed my 33% Ultimate biplane with a phenomenal setup. Plenty of power and very fast which is not common on a biplane of this size. On your monoplane it should rock, specially if you're only at 26 pounds. The following setup will fly your plane beautifully:

Turnigy SK 170kv motor (from hobbyking.com)
Sentillon 120 amp, 12 lipo speed controller (from hobbyking.com)
Apce 25x12.5 prop
12 lipos

My bird is weighing about 23 pounds actually and I'm getting enormous power with a 24x12 apce. Pulling about 90 amps. A 25x12.5 will do the trick just fine for you. But you need to purchase the apce not Xoar or any other wood prop, Apce. I spent over $100 in props to test and the apce was the best. Also, my bird is running on 14s2p a123's which is 5 pounds and 8 ounces just in batteries. This is equivalent to 12 lipos. But I recharge every 15 minutes. :)

Lipos would save you good weight but then you have to worry about c rating, heat and having to switch batteries for every flight which is a pain. I'll have the extra 2 pounds for the added convenience.

So you have an idea, I was getting 25 pounds of thrust on 13 a123's with a 24x12. I haven't measure how much thrust I'm getting now with 14 cells but she pulls much harder. So with a 25x12.5 you will be getting 30 pounds of thrust easy and will be looking at possibly 110 amp draw.