1/4 Scale Edge 540

[Stan Carter]

I have a 78" Edge 540 that I have converted to electric. I read a lot of the threads here to determine what motor to use and decided on a Axi 5320/28. Finding a motor, mount and speed controller at a good price from someone on RR made it easier to decide. I was going to use 10S4P 25C FP packs (4 x 5S 3300) and the manual with the motor says to use a 18/12 prop.
Two questions, would that be the correct prop to use and second would there be anything wrong with mounting the ESC on the fire wall? I though if I mounted it there it would stay cooler, rather than inside the plane. The ESC is a Jeti 90 Opto with a programming card.

Thanks for any info you might have.

Stan

[M Carr]

you prop choice sounds about right for that motor. I'm guessing somewhere in the 55-60amp range? That sure sounds like an awefull lot of batteries for a 78" airframe "weight". It all depends on how you want to fly it though.

I put all my esc's outside of the motor box for the exact reason you mentioned, better cooling.

I ran an eflite power160 with an 18x10 on 10s, same KV as the AXI your runnning. Motor/batteries/esc would come down just slightly warm after a 8 minute flight. I tried a 20x10 but seemed a bit taxing on the motor and esc. 18x10 was Good power for the 74" Extreme flight yak (13lbs. ready to fly), but have since switched out to a hacker motor.

I never actually tried a 18x12 on it, had plenty of speed on the 18x10.

[Stan Carter]

I was thinking that I needed to go with 10S2P to get somewhere around 5 to 6 minutes of flight time. I'm comparing this to my 90 size helicopters that weigh from 10 to 12 lbs. I run 10S and 12S them but only 1P. Never thought you could get 8 minutes with a 13 lb plane on 1P packs. I'll try 1P and see what happens, at least then I would have a spare set for another flight.
When finding the location of the packs so the CG will be where it needs to be, is kind of tricky. Almost seems like the packs will have to be closer to the wing than where the fuel tank was, especially if I use 10S1P.
Thanks for the help. Will let you know how it flies, will fly it tomorrow. Hope I remember how to fly a plane, after three years of nothing but helis.

Stan

[M Carr]

Average amp draw is much less on airplanes over heli's and much easier on the batteries. At least from what I have found. Not sure how you keep track of batteries, but i use the 80% rule of Mah used.

My Yak with the setup mentioned earlier averages about 2100Mah out of a 3700 pack on an 8 minute flight(could probably stretch it to 9-10minutes). It all depends on throttle management and how hard you like to fly. I very rarely use full throttle and then when needed it only for a few seconds at most. Most of my flying is around 1/2 to 3/4 throttle.

I would definatly start with a short time of maybe 5-6 minutes and go from there. That way you dont over discharge a pack and you can adjust your flight times accordingly.

Your 10s4p setup would get you 6600Mah's probably enough to fly for 20 minutes :D , I dont really like to fly that long at one time, Thats why I settled on 8 minutes.

good luck with your maiden flight!!!

[appleflyer]

who makes the edge that you have?

[Stan Carter]

Thanks busted blade. I always use the 80% rule on my Lipos, they cost too much not to. If I get 5 to 7 minutes of flight time, that is plenty for me.

appleflyer
who makes the edge that you have?

I'm not sure, I bought a few years ago from my LHS, where it was on consignment so I don't even know who owned it. I think it is either a Hanger 9 or Great Planes.

Stan