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Old 04-11-2012, 11:31 PM   #1
paxskipper
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Red face Need Apprentice 15E Motor

I crashed my Apprentice and in general it looks repariable, but I think I need a new motor -- 840kV E-flite (EFLM7215). I also need a new motor mount and cowl; these are relatively inexpensive, it is the motor cost that makes me question doing the repair.

Does anyone have an Apprentice motor that they don't need?

Steve P.
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Old 04-12-2012, 02:13 AM   #2
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Is the actual motor bad? A lot of motors are repairable for far less than the cost of the motor.

Happy flying may your crashes be limited and if they are not limited let them be cool.
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Old 04-12-2012, 02:18 AM   #3
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Originally Posted by Fishbonez View Post
Is the actual motor bad? A lot of motors are repairable for far less than the cost of the motor.

It is very difficult to turn, seems to be binding. I am planning on taking it apart to see if the shaft is bent, but have not had a chance to do that yet.
Just thought I'd find out if anyone had a motor available just in case I needed it.
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Old 04-12-2012, 02:23 AM   #4
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Sounds like the shaft may be bent. Replacing the motor is no big deal. You really don't have to buy the same motor if it turns out that one is shot. You can put anything from an expensive motor to one of the cheaper ones in and still have a great flying plane. Nothing says you can't change out the motor with a different brand.

Ed
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Old 04-12-2012, 02:25 AM   #5
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Cool. I just was curiouse if you knew that a lot motors are repairable. Believe it or not I did not know this until a just a few months ago/ A good thing I did not throw those old motors away. Rebuilt them and now have plenty of spares but unfortunatly I do not have a spare 840KV motor.

Mred is also correct there are a lot of different options for a replacemnet

Happy flying may your crashes be limited and if they are not limited let them be cool.
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Old 04-12-2012, 10:59 AM   #6
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27.95 for a 550w, 30 amp 4.5 ounce motor. Throws a 11X5 prop and should work with the eflight speed contol.
http://www.headsuprc.com/servlet/the...5-Sport/Detail

Same for this one, but it is a more efficent motor, and also uses the 11X5 prop, but only draws 27 amps. Weighs 4.8 ounces
http://www.headsuprc.com/servlet/the...lectric/Detail

$29.95, 620w 900kv, 6.0 ounce and again, uses a 11X5 prop, pulls 31 amps.
http://www.headsuprc.com/servlet/the...5-Sport/Detail

$15 for a firewall adaptar that should work with any of the above motors.
http://www.headsuprc.com/servlet/the...unt-for/Detail

I would pull off the stock motor, weigh it and compare shaft sizes, then I would buy the motor that was closest as far as weight goes. That way you should have to change or add much weight. But this way if you do have to replace the motor, you might end up with a more powerful, more efficent setup, for about half what that $70 motor does. If you wanted to go cheaper and lighter, a 480 class motor might also work, but I honestly have no idea what the e-flight motor pulls, or anything weight wise.
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Old 04-13-2012, 10:19 AM   #7
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After 60 flights, I finally did the same as you and crashed (Crash #3) bad enough to damage my motor. I ordered this from HobbyKing:

http://www.hobbyking.com/hobbyking/s...dProduct=19022

It's 810Kv instead of 840Kv, but it is close. There is a higher Kv motor G15 on there that even has a review from someone that even used it on an Apprentice with good results. I chose this one as I rarely use full throttle, and this was closer to the factory rating, and i only felt more speed was going to stress my high mileage wings even more. Will post results after fitment.
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Old 04-13-2012, 11:48 AM   #8
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Originally Posted by NFA Fabrication View Post
After 60 flights, I finally did the same as you and crashed (Crash #3) bad enough to damage my motor. I ordered this from HobbyKing:

http://www.hobbyking.com/hobbyking/s...dProduct=19022

It's 810Kv instead of 840Kv, but it is close. ...
Thanks for the info. I have two questions:
First, did it fit the Apprentice motor mount?
Second, did you stay with the 11 x 8 prop?

Again thanks for your response
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Old 04-13-2012, 09:00 PM   #9
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Originally Posted by paxskipper View Post
Thanks for the info. I have two questions:
First, did it fit the Apprentice motor mount?
Second, did you stay with the 11 x 8 prop?

Again thanks for your response
The other G15 motor has a review that says it is a direct fit (This is also a G15 motor, I believe all dimensions are the same, just different Kv). I have not recieved mine yet. I will post results and pics, maybe video.
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