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truck motor for airplane?

Old 03-09-2012, 05:07 PM
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OIL CAN DAN
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Default truck motor for airplane?

I've been flying Nitro forever and want to get into electrics and My Brother gave Me several motors but I think that they are for cars or trucks but will they work for planes? They are a Trinity Magic, a Magnetic Mayhem 360, and a LeMans 240s with a Griffin 55 esc,and a duratrax spike mosfet esc? Any help would be....Well.....Help! Thanks Dan
Old 03-10-2012, 11:26 AM
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Dr Kiwi
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Default RE: truck motor for airplane?

Quite a few people use Magnetic Mayhem motors (correctly geared) in aircraft.... a Griffin 55A ESC would work with that type of brushed motor.

Just one Motocalc example:

Motor: Kyosho Magnetic Mayhem; 2260rpm/V; 1.37A no-load; 0.0667 Ohms.
Battery: Thunder Power TP2100 (ProLite) (15C); 3 cells; 2100mAh @ 3.7V; 0.018 Ohms/cell.
Speed Control: Castle Creations Pegasus 35P; 0.0015 Ohms; High rate.
Drive System: Direct Drive Propellers; 12x6 (Pconst=1.69; Tconst=1) geared 3:1 (Eff=95%).
Airframe: Anything you want.

Motor Amps = 23.3
Motor Volts = 9.8
Input (W) = 228.9
Loss (W) = 64.0
Motor RPM = 17844
Prop RPM = 5948
Thrust (oz) = 48.6
PSpd (mph) = 33.8
Old 03-10-2012, 07:29 PM
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OIL CAN DAN
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Default RE: truck motor for airplane?

Thanks Dr Kiwi! Especially for doing all the math for Me. I am assuming that the set up that You put together will result in approx. a .40 sized airframe since it is swinging a 12 inch prop?
Old 03-12-2012, 11:33 AM
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Default RE: truck motor for airplane?

That was just an exercise to see what Motocalc came up with.....I fear that might not be enough for a .40 size plane... one rule of thumb for IC/electric conversion is Watts = cubic capacity x 2000... so that suggests 800W for .40 glow.... of course, a trainer type .40 would need less. Another rule of thumb is W/lb... what does a .40 trainer weigh... ?3-4lb... and 80-100W/lb is a good power to shoot for..... so you might need 300W-400W.
Old 03-12-2012, 06:10 PM
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Default RE: truck motor for airplane?

I think I can achieve an all up weight of 3 pounds considering the mahyhem motor alone is 7 oz...yikes...So I have ditched the idea of NMH for power and ordering 2200 3s 25C turnigy LiPo's. From reading up on the Beginner Electrics (Thanks to aeajr, Ed Anderson) I'm ok with a higher C rating, just not lower. I assume the lipos are approx. 1/3 the weight of NiCad/NMH putting the gear at a little over 1 lb?. I have 3 different foam wings to choose from approx 32 to 36 inch span and building the (foam) fuse accordingly. I think that I'll be airborne with enough runway! Thanks again for Your help Doc!

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