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Old Feb 01, 2013, 11:55 PM
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United States, CO, Colorado Springs
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Texas RC Extra 260 Conversion

My neighbor has flown this plane on an OS .46 LX.

http://www.texasrcplanes.com/ex260ni.html

He no longer flies it, and has pulled the engine. He offered it up to me if I wanted it, but I fly electric. I was doing some research and lots of reading on here as well as other sites to try and figure out what size motor/esc/battery to run on this.

I was thinking 4s probably, and I read start with prop size. I want to be able to do 3d flight, so I know power to weight ratio is important. He was flying an 11" prop I think, and the .46 seemed way underpowered for this plane. 52" ws, 5.4 lbs 488 sq in wing area.

So curious what everyone thinks out there....
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Old Feb 02, 2013, 12:16 AM
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Australia, ACT, Kambah
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Originally Posted by AK Flyer 76 View Post
My neighbor has flown this plane on an OS .46 LX.

http://www.texasrcplanes.com/ex260ni.html

He no longer flies it, and has pulled the engine. He offered it up to me if I wanted it, but I fly electric. I was doing some research and lots of reading on here as well as other sites to try and figure out what size motor/esc/battery to run on this.

I was thinking 4s probably, and I read start with prop size. I want to be able to do 3d flight, so I know power to weight ratio is important. He was flying an 11" prop I think, and the .46 seemed way underpowered for this plane. 52" ws, 5.4 lbs 488 sq in wing area.

So curious what everyone thinks out there....
You're right to start with prop size, but unless the glow prop was the biggest that could fit with enough ground clearance, the 11" prop size previously used with a 46 glow is actually a red herring. 52" span, 5+ lb you'll be wanting to get a 14" prop on there. Kv around 500, eg Turnigy G60-500, 14x7, 6S will give you around 200W/lb, around 10lb static thrust, and decent pitch speed at 64mph. That'll 3D!

If the motor sounds large, intentionally so - an OS 46ax weighs 490g with its muffler so you don't want to go too light on the motor or you'll just end up using useless nose ballast rather than going easier on the motor and pulling less current from the batteries.

Anyway, that's just an example - until you can advise how big a prop you're willing to run it might be totally irrelevant.
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Old Feb 02, 2013, 12:30 AM
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Thanks for the quick reply. So any motor rated for 500kv will do? I think the room is there for a larger prop, I will have to check ground clearence. 70a ESC then to run a 6s on here sound about right?

Thanks again for the info.
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Old Feb 02, 2013, 02:23 AM
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Originally Posted by AK Flyer 76 View Post
Thanks for the quick reply. So any motor rated for 500kv will do? I think the room is there for a larger prop, I will have to check ground clearence. 70a ESC then to run a 6s on here sound about right?

Thanks again for the info.
Kv of 500 is only a good solution if you run 14"&6s, and to handle the powe r you're looking at motors weighing at least 300g.. 60,70A is heaps for around 1000W on 6S
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Old Feb 02, 2013, 03:34 PM
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So I happened to be at an rc auction today and came across an Eflite 60a esc- $40, and this motor http://www.exceedrc.com/63m55.html. For $20.

I think this set up will work on 5s for this plane. Thoughts?

Im thinking of swinging a 14/6 on it....
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Old Feb 02, 2013, 08:57 PM
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Originally Posted by AK Flyer 76 View Post
So I happened to be at an rc auction today and came across an Eflite 60a esc- $40, and this motor http://www.exceedrc.com/63m55.html. For $20.

I think this set up will work on 5s for this plane. Thoughts?

Im thinking of swinging a 14/6 on it....
Not a chance if you're hoping for 3D!

The motor has very similar specs to an Eflite Power 60. It will be gutless for what you want to do on 5S with a 14 x 6 - barely 300W, and only around 550W on 6S.

To use that motor for 3D flight you'd want to run at least a 15" prop on 6S.

Compared with my earlier suggestion: you can't go down in Kv, ie 500 to 400, and down in cells ie 6 to 5, with the same 14" prop and expect to stay anywhere near the same power and thrust as these changes all have exponential effects on power.

If, and only if, you run 6s and a prop bigger than 14" will you get full-on 3D performance from that motor. 6S and a 14 x 10 at about 720W in should be pretty good for unlimited aerobatic flight.

But hey, it was a damn good deal at $40 and $20. Get some cheap 6S packs that can support 35-40A peak, and see how it flys with a 14" prop - but at least 8" pitch definitetly not 6". The big bonus is that if you can fit a 15 or 16" prop, the motor can handle all the power you need and then some.
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Old Feb 02, 2013, 09:22 PM
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Eh, worth a shot right. I have to get my hands on the bird, maybe tomorrow, and figure out what I am dealing with for ground clearence.

Heck if a 15" prop fits, might not be a bad choice either, 6s 15x6? 15x8?

For $52 for the turnigy you suggested, if this motor doesn't work on a 14x8 on 6s, or I don't have the clearence for the 15", then I can always get the turnigy and swing the 14x6.

I appreciate the help on this, this will be a bigger electric than my others (my scale birds, but don't need as much power).
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