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Great Planes Yak 54 81" Electric

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Old 01-10-2011, 06:59 PM
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killerG
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Default Great Planes Yak 54 81" Electric

I just got a Great Planes 81" Yak 54 from a friend. It calls for a 1.60 glow or a 32-43CC gas motor. I was going to put a G38 gas engine on it, but before I do I thought about an electric setup for it. The specs on it says RTF is about 12.5lb -15.25lb weight. I don't really know much about electrics. I do know that I WONT be doing hard 3D. I want to set it up more as a pattern, IMAC style flying.
What would be a good setup for this?

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Graham
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Old 01-11-2011, 07:10 AM
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Default RE: Great Planes Yak 54 81

Try this:

Motor - something along the lines of HobbyCity motor like a 6360 - 230 KV, AXI 5320, Scorpion 4030-210, Hacker A60-22S

ESC - 90A HV ESC ... something like the Hobby City ones work fine but if you want downline braking, try the better ones such as a JETI or Castle Creation

Batt - 25C 5S 4,000 to 5S,4900 (x2) for a 10S set up

Prop - 19x10 to 20x10

Misc - you will need a separate power supply for the RX, you can use lipos or NiMH.
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Old 01-11-2011, 01:42 PM
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Default RE: Great Planes Yak 54 81

Ok I will look into that sort of setup. But isn't 4000-4900 a little small on the batteries. I thought I would need about 6000mAh to get decent flight times.
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Old 01-11-2011, 10:10 PM
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Default RE: Great Planes Yak 54 81

Yes you want longer flight times but it will also mean a heavier plane. Keep her light, not too light of course, for IMAC flying. With decent 4,900 mAh packs you can squeeze 8 mins out of her with ease.
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Old 01-11-2011, 10:59 PM
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Default RE: Great Planes Yak 54 81

So what kind of prop rpm's should I be looking for?
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Old 01-12-2011, 07:15 AM
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Default RE: Great Planes Yak 54 81

Best you FIRST check the amp draw with the initial prop that you want to use ... if its within the range that is safe for the system then fly her and test with different props. Flying is the only way to know which prop suits you and/or the plane. You want to use a baseline guide for the power. You want something like 150W/lb at the least for IMAC. Now you are talking watts/lb based on AMP DRAW and not what is at the prop. So if you plane is say 12 lbs, you want to touch about 1,800W. I enjoy the XOAR E props and feel they got more bite than APC-E ones.

Attached was my MidWest CAP 232, she weighs in at about 15 lbs and pulls 2,300W ... only good for sport flying. Verticals are nothing to shout about. So that gives you an idea as to how much power you want.
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