I couldn't find a great deal on this subject.

Motor shafts look shiny and smooth and absent of parts needed to mount spinners and props. I don't see threads either?

I'd like to learn about mounting methods of what parts onto the motor shaft?

Also, reversing the shaft for front mounting?

Any information, especially if accompanied with photos will me much appreciated.

Thanks in advance.

Charles

Hi Charles:

This will have to be fast as my mother in law has made pork chops with stuffing for dinner and it's almost ready to serve...

A front mount system uses a prop adapter that fits onto the motor shaft and is held in place via a collet type attachment As you tighten the prop nut the collet squeezes down on the motor shaft. This is especially nice since it allows you to set your spinner gap to the nose ring perfectly. Like everyone else who sees this mounting system for the first time, I was highly skeptical that the collet arrangement would grip sufficiently to the motor shaft. Well, I'm several years into using this setup and have long since forgotten those fears. There is no way it will let go if properly tightened.

The prop adapter has the prop shaft and threads on it and operates just like any other prop shaft.

Your motor came with reversing instructions. If it didn't, it was probably already setup for front mounting. Lately I've been using some of the Cobra line of motors with great success. They come with the shaft setup for front mounting, and they provide a bolt-on adapter for use with rear mounting. Very nice stuff!

I highly recommend front mounting. It halves the cantilevered loads on the motor by placing the rotating can behind the mount and the prop and spinner and prop loads in front of the mount. The main bearing is located right in the center. The only problems I've had with electric power is when I tried rear mounting of my motor. I got a great deal of "armature scuff" and the main bearing "coned out" its mount and it spun... making an awful noise in the process. I switched to front mounts and haven't had a problem since! I know that there are those who use and swear by the rear mount system. That's fine by me, but you won't see one in any of my planes...

Later - Bob Hunt

       

Dean,

8mm, that's a lot of shaft and is probably overkill for the model I have in mind and for my first electric model.

Most of the motors I've researched have 5mm shafts.

The model I'll build for electric has only 543 sq's, 55" in span.

Thanks for the reply.

Charles