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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Randy Powell on October 12, 2015, 05:02:02 PM

Title: Cobra motor question
Post by: Randy Powell on October 12, 2015, 05:02:02 PM

So, I have an E-Flite Power 32 motor (I'll get to the Cobra). It is possible to take off the collet and set screw and use a arbor press to push the shaft through the can facilitating either front or rear mount. There is a flat spot on both ends of the shaft to accommodate the collet and set screw.

On the Cobra, it uses a little set ring set into a groove in the shaft to hold the can on. But looking at it, it seems if you press the shaft to allow rear mount, there is no groove to put the ring retainer in and so, no way to retain the can. I know you can use the bolt on propeller shaft and rear mount it with the main shaft sticking out the other end, but is there a way to press the main shaft through or is the only option to use the provided bolt on shaft?

Hope that's clear.

Title: Re: Cobra motor question
Post by: CircuitFlyer on October 12, 2015, 06:00:20 PM

Sorry I don't have experience with Cobra motors, but it sound like your only option is to remove the shaft, reverse it end for end and re-install it.  Can someone with a Cobra motor confirm that?

http://innov8tivedesigns.com/parts/motor-parts/c-2808-shaft-kit

Paul

Title: Re: Cobra motor question
Post by: Mark Scarborough on October 12, 2015, 07:41:08 PM

you might email Paul,, he has used cobras

Title: Re: Cobra motor question
Post by: Fred Underwood on October 12, 2015, 08:59:59 PM

Done with correspondence from Lucien at Innov8tive.  The shaft was removed and reversed.  The flat then is used for the collar that was included, tapered side toward the bearing.  C-clip not used unless you want to make a shaft ring to seat it.  You then need to grind flat(s) for the case to shaft screws.  I have done it, but not used it yet.  It was the last winter project and the weather stayed too mild to finish the build, but great for flying.

I believe Paul and Howard have them reversed and in use, so you could check with them.  Please post back if you get better/more information.

Title: Re: Cobra motor question
Post by: Howard Rush on October 12, 2015, 11:13:02 PM

I didn't remove the shaft.  I just removed the clip, then pulled the shaft-magnet assembly off (careful not to get your fingers pinched when the magnets pull the parts back together), then pressed the shaft to the new position with an arbor press.  It takes a lot of force.  As Fred said, you have to grind a flat, which is not a big deal.  A collar and set screw come with the motor. I have a bunch of those set screws now.  I'll give you some. 

Don't try using an arbor press to reposition a Plettenberg shaft.  Don't ask.

Title: Re: Cobra motor question
Post by: Russell Bond on October 13, 2015, 12:27:28 AM

Hahahaha, Yes Howard, I know all about that as well..... ;D ;D ;D

Title: Re: Cobra motor question
Post by: Randy Powell on October 13, 2015, 11:09:19 AM

Thanks, Howard. That should work.

Title: Re: Cobra motor question
Post by: Fred Cronenwett on October 16, 2015, 10:24:47 AM

Look at this video I found on youtube on how to reverse the shaft on the E-flite motors

https://www.youtube.com/watch?v=O6GbYir8fCs

Fred