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Old Jun 24, 2011, 11:01 AM
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Portland, OR
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bought 60 size NTM motor need ESC recommendations

I have a 60 amp ESC but wonder if it will be enough. The plane will be about 7 lbs and the motor is 470k Ibeleive. I would be using a 5 cell lipo or maybe 6 cell. THe mototr recommends a 60 amp esc and cell range between 5-7.
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Old Jun 24, 2011, 12:42 PM
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Jeffreys Bay South Africa
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post the motor details and what size prop you gonna swing ?
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Old Jun 24, 2011, 02:29 PM
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Spec.
Battery: 5~7 Cell /18.5~25.9V
RPM: 400kv
Max current: 40A
No load current: 10V/2.7A
Current capacity: 60A/15sec
Internal resistance: 0.06 ohm
Weight: 359g (not including connectors)
Diameter of shaft: 6mm
Dimensions: 81x50mm
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Old Jun 25, 2011, 03:53 AM
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yea that will be fine then, just make sure you run a prop that is suited for 5/6s ... is that esc you got rated to handle 6s ?

start with a small prop , and check amp draw , then go bigger
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Old Jun 27, 2011, 10:57 AM
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Would I gain a lot more going 6 cell or can I stick with 5? I need to order a battery fo rher.
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Old Jun 28, 2011, 12:51 AM
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Birmingham, Alabama
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what type of plane? If it's your typical floater like a .60 sized trainer ya itll more than fly it.

yes, a 7 pound plane is a .60 class 2 stroke
where it gets confusing is:
1) engine performance is very WIDE (for example just in 2 strokes, an old Enya .60 will only putt putt an 12-6 at 10,000rpm. that's no faster than a .45 class engine. where most good .60 class engines are going to be turning a 12-6 in the 13-16500rpm range. (and likely running a little more prop)
2) virtually all common quick sizing formulas advocated (like the popular displacement in ci * 2000 = watts for a target) leaves you with a far under powered version of what would commonly be encountered with modern glow engine designs from the last 20 ish years.
You either wind up with the same thrust, completely lacking the pitch speed, or you can get the pitch speed & loose the thrust. VS a properly sized 2 or 4 stroke glow plant. (most common is to have the same thrust, and half the pitch speed.)


unless im missing something you bought a Turnigy Easymatch 60 as there is no 400kv NTM currently listed on HK.

http://www.hobbyking.com/hobbyking/s...dProduct=14405

So for just some generic plane, yes. That will more than fly it, however. It is not likely to have the thrust and pitch speed a typical .6X class 2 stroke, or .90 class 4-stroke. So if it's an aerobatic or fast model, def get more motor on it! (Honestly brushless outrunner installations generally have a lot more in common with the powerband diesels have)
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Old Jun 28, 2011, 02:28 PM
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Ok, thanks for the detailed info! I bought a 6 cell lipo with my 60 amp ESC and the Easy match .60 motor. Not looking for crazy performance but would like strong take offs in short runway areas. I think this would do that, but I am not going to get vertical performance by any means.
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Old Jun 28, 2011, 02:41 PM
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what kind of plane?
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Old Jun 28, 2011, 04:30 PM
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I got it from Nitro Planes. It's th e.60 size gas low wing trainer that I am converting to electric. 71 inch wingspan and about 7 lbs.
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