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Motor recommendations for hob warbirds

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Old 01-27-2014, 09:00 PM
  #1  
Steve Westphal
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Default Motor recommendations for hob warbirds

My brother and I are building a couple of HOB warbirds and need a suggestion for a powerful elec. motor. The wingspans are 36 inches with weights of around 28 ounces. The glow recommendation for these birds is .049 to .09 I have a couple of extra 25 amp ESC's which I would like to use. I have had luck in the past with Turnigy motors from Hobbyking. Any suggestions would be appreciated. They do not have to be Turnigy or HK necessarily, but, affordable. Thanks.
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Old 01-28-2014, 03:16 PM
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Dr Kiwi
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.049 weighs around 50g, .09 maybe 80-100g... there are lots of electric possibilities which will get you more power at less weight... but let's start with 50-60g, spinning perhaps a 6" prop (EMP 6x5 is a good one).

http://www.hobbyking.com/hobbyking/s...ner_Motor.html

I cannot accept the idiotic 340W, but with a 6x5 on 3s you would be around 20-25A and it should survive that in short bursts.

Last edited by Dr Kiwi; 01-28-2014 at 03:20 PM.
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Old 01-28-2014, 09:06 PM
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aeajr
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28 ounces is 1.75 Pounds. So you want something in the 175 to 250 watt range. You can always stack in more but that is the range I would consider for plenty of power.

Using the electrify calculator we can see what they would recommend in an Rimfire out runner.

I set the max prop to 10 inches. You could go larger if you like

I will set battery at 3S

Aerobatic performance


[TABLE]
[TR]
[TH]Best Combination
[/TH]
[TH][/TH]
[/TR]
[TR]
[TD="align: right"]Performance
[/TD]
[TD]Aerobatic
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Electrifly Rimfire Motor
[/TD]
[TD]35-30-950 / GPMG4590
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Ratio
[/TD]
[TD]N/A
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Drive
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Propeller
[/TD]
[TD]10x4.5 in., Electric
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Battery
[/TD]
[TD]1250 mAh, 11.1v
[/TD]
[TD]

[/TD]
[/TR]
[TR]
[TD="align: right"]ESC
[/TD]
[TD]SS-35 / GPMM1830
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]ESC Motor Adapter
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Motor Mount
[/TD]
[TD]Medium / GPMP1255
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Current Draw
[/TD]
[TD]18.1 amps
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Speed
[/TD]
[TD]29 mph
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Thrust
[/TD]
[TD]28.6 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Weight of Power System
[/TD]
[TD]7.53 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Flight Time at Full Throttle
[/TD]
[TD]4 minutes
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Watts per Pound
[/TD]
[TD]114.29
[/TD]
[/TR]
[/TABLE]


Or this for very high performance


[TABLE]
[TR]
[TH]Best Combination
[/TH]
[TH][/TH]
[/TR]
[TR]
[TD="align: right"]Performance
[/TD]
[TD]3D Flyer / High Performance
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"] Electrifly Rimfire Motor
[/TD]
[TD]35-30-1250 / GPMG4595
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Ratio
[/TD]
[TD]N/A
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Gear Drive
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Propeller
[/TD]
[TD]10x7 in., Electric
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Battery
[/TD]
[TD]2100 mAh, 11.1v
[/TD]
[TD]

[/TD]
[/TR]
[TR]
[TD="align: right"]ESC
[/TD]
[TD]SS-35 / GPMM1830
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]ESC Motor Adapter
[/TD]
[TD]Not Required
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Motor Mount
[/TD]
[TD]Medium / GPMP1255
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Current Draw
[/TD]
[TD]27 amps
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Speed
[/TD]
[TD]54 mph
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Thrust
[/TD]
[TD]39.9 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Weight of Power System
[/TD]
[TD]10.13 oz.
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Approximate Flight Time at Full Throttle
[/TD]
[TD]5 minutes
[/TD]
[TD][/TD]
[/TR]
[TR]
[TD="align: right"]Watts per Pound
[/TD]
[TD]171.4
[/TD]
[/TR]
[/TABLE]

Last edited by aeajr; 01-28-2014 at 09:08 PM.
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