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Old Nov 04, 2002, 02:06 PM
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Texas
Joined Nov 2000
459 Posts
Need help with brushless selection....

Hey Guys,

I'm converting a Century hawk and need help selecting a motor. Fred's been flying one with an Aveox 1412/4(800kv) on 20 cells with great results. I'm shooting for duration and here's the math on the setups I've worked out so far:

Aveox 800kv x 20cell x 1.2v=19,200 no load RPM
Mega 22/45/3 1000kv x 16cell x 1.2v = 19,200 no load RPM

I like the idea of the Mega but have not been able to find one in stock anywhere. Can someone else recommend a good motor for this conversion? I'll be flying with a Schulze 35 Heli controller.

-Stephen
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Old Nov 04, 2002, 02:20 PM
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United States, FL, West Palm Beach
Joined Jun 2001
2,216 Posts
Hello

http://www.megamotorusa.com/brushless.htm

Carlo
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Old Nov 04, 2002, 04:28 PM
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Auckland New Zealand
Joined Mar 2001
386 Posts
one important aspect to remember when selecting your motor is the load will be constant, which can generate a lot of heat. Some motors are better at disapating that heat than others.

also remember that as you go to a higher reving motor with less cells, your current will increase, so flight time shorten

if you can get the gearing high enough & still use 20 cells your flight time will be better & heat probably less, but you will be working lower down on the throttle curve / govenor setting.

Let us know how you get on, as many have looked at using the Mega 45 in a heli, but i can't remember seeing any results.

comments from using 22/20 's in smaller helis have been that they get hot.

good luck
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Old Nov 04, 2002, 05:04 PM
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Texas
Joined Nov 2000
459 Posts
Thanks Keith,
So you're suggesting that going with a lower KV motor with more cells will produce longer flight times? I have found that the Mega 22/45/3e's are available. Those have a KV of 800.

Hopefully cooling won't be an issue. I think I have an effective place to mount a pc fan in order to help with airflow. Maybe I can find a heatsink as well.
-Stephen
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Old Nov 04, 2002, 05:13 PM
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Auckland New Zealand
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Am not sure of the specs on the E motor, but using the lower kv should be the better way to go.
You should end up with more torque, which will become a factor once you start throwing it around a bit.
It won't make much difference while just hovering, as the pitch changes tend to be small & slow, but once away from hover or in the wind, the load changes can become quite dramatic, & a motor with too high kv will not respond as quickly & will draw more current than one with a lower kv.
As Fred has said 800 seems to be a good number.
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Old Nov 04, 2002, 06:40 PM
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Joined Aug 1999
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I have flown the Hawk on both a 1415/3 and a 1412/4. Both flew well, but the 4y on 20 cells was the best.

I was looking at the 22/45 megas and the 45-3 Jeti motor as viable BL motors.

I also tried them both with 16 cells, but 20 was always better. The Jeti on 20 cells is pushing the motor, but only at full rpm. The prices are close and the Jetis have lots of torque, which is nice in a heli.

Either motor will take the Traxxes or hacker heatsink too.
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Old Nov 04, 2002, 06:47 PM
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Texas
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Fred,
Should I try the Mega 22/45/3E & 20 cells? It appears to be the same motor with an 800kv instead of 1000kv. Those motors are much easier to get.
-Stephen
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