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Which 3536 Motor to Run ?

Old 06-10-2014, 05:47 PM
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superchargedill
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Default Which 3536 Motor to Run ?

Hi Guys, I've been flying nitro for about 25 years but I'm pretty new to the electric scene. I recently bought the 1100mm Old Crow P-51 which has a 3536 750kv, 35 amp ESC and the motor is rated for 35 amps. It flies pretty nice but I'm a speed freak and like to over power my planes. I jut got a WattsUp meter so can check the vital statistics of my combos. I recently purchased the same motor and ESC that comes on the Roc Hobby Strega P-51 thinking I would slip in a proven combo, but the motor is too long and leaves too much of a gap between the spinner and the cowl. I want to put a 3536 back on but want one that will make this plane get it on. What 3536 motor would you recommend if I want to run the factory 4 bladed 10x8 prop ?
What motor would you recommend for a 10x10 2 bladed prop ? I've got a 70 amp ESC so that's not a problem. I also have 3s and 4s batteries. I just want a motor that can handle the job and not burn up due to over amping.

I understand that the higher the kv rating the higher the rpm. I do see that the higher the kv usually the prop sizes get smaller. But the amp ratings on the 750-850kv motors seem to be very low around 25 to 30 amps, with the higher KV rated motors 1250- 1450 closer to 45-50 amps, which if I understand correctly would have a little more safety net for running a 4s battery.


Can a 3536 1450kv motor swing a 4 bladed 10x8prop and run at the higher rpms? Or at least higher rpm's than the stock 750kv which puts that prop at about 8,325rpms. I'd like to get that prop up to around 10,000rpm or better. Any help is appreciated. Thanks for the help, Dil
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Old 06-10-2014, 07:13 PM
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Glacier Girl
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Welcome to the wonderful world of electrics!

A tip use a calc program, lot cheaper then buying unusable parts. MotoCalc (www.motocalc.com)is a decent one, I use it, has a free 30 trial. There are others too.

You input your plane's specs, then load up what ever motor/esc/prop/battery combo you want and it will give you a pretty decent idea of what's going to happen with your proposed set up.

Just for giggles I loaded up a Top Flite Mustang (using 40 oz empty weight), with a Horizon Hobby Power 32 motor(770 kv rated for 50 amps continuous), 60 amp esc, and a 4S3700 20C pack with the 10x10x2 prop.

M/C spit out 40.8 amps, 55.1 oz of thrust, and a prop speed of 94.4 or roughly 60 mph. Bump it up another cell to 5S, and you'd be pushing the motor at 55.8 amps, but thrust would climb to 76.5 and a prop speed of 111 or roughly 71 mph. With good cooling airflow you might get away with it.

I don't think the 3536/1450 would last at all spinning the 10x8x4, on 4S, would be in the 75 amp range.

I'll let you in on a little trick I used to use in my Stryker days. Low KV and high voltage. High volts on a low KV motor means lower amps,but it also means you have a motor with grunt that can spin a big prop fast. You can series wire your packs together to run them as a 6, 7,or even 8S set ups.

If memory serves me my one flying bud has a Hobby King one of those Mustangs, he runs a 580 kv motor on it with 6S, and it's crazy fast. Sorry I don't know what prop he's using, but it it a 2 blade.

Lastly, check out the threads on the 1100mm warbirds here and over on rcgroups, see what they other speed freaks are popping under the hood of theirs.

Best of luck and welcome to the addiction.
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Old 06-11-2014, 07:14 AM
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Thank you for the information and the link. I really appreciate your help. Dil
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