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[Reaper]

I took a couple of pics of the frame.  I plan on mounting an etek-r motor on the swing arm and putting the batteries inside the engine compartment.  Anybody have any ideas or insight?

[Bogan]

you mean on the side of the swingarm, or in front of the shock?

[Reaper]

I was thinking of putting a custom motor mount plate on the swing arm proper like this:

[picasso]

Your going to mount it sticking out of the side of the swing arm?

[Bogan]

eeewwwwwwwwwwwwwww, thats gonna look huckory as. What appears to be the easy way, isn't the right way. Figure out the right way, then figure out how to do it, goes for the whole build, you'll end up with a vastly superior bike that way.

[Reaper]

Hmmm....  I didn't think that it looked too bad.  The swing arm mounted motor was proposed in the book "Secrets of El Ninja" by John Bidwell.


This guy did it: http://www.evalbum.com/2793 and since it's closer to the rear sprocket I'd think that it'd be more efficient.  Would you disagree?

I've given myself a full year dedicated just to planning and design so I have time to change this idea if I want to.

Here's some other options:

[Bogan]

don't think it would be any more efficicent as there is no friction losses in a straight peice of chain, only when it goes around a sprocket.

I think it does look quiet bad, but it's you bike, so if you like the look then go for it. Have a look at what I did with mine and see what you think http://electricmotorcycleforum.com/boards/index.php?topic=53.0

[Reaper]

WOW. 

Yeah man, you've got a great looking bike build there.  If you're looking for me to say that it doesn't look good, and the swingarm mount is better, you'll be quite disappointed.  You'll get no argument from me!  Excellent looking bike.

But of course, your engineering skills significantly exceed mine.  I am looking to build one with very little or no machining or welding.  For this purpose, (and since I am a newbie, this is my first bike build) the swing arm mount seems like it would work.   I am worried about a little off balancing though.... with an Etek-RT motor (which I understand weighs 36lbs, the bike could be a little off balance...) 

I'll also need as much room in the engine compartment as I can for batteries, so I'd like to shift that motor out of that area if possible. 

I guess now that I think about it, the swing arm mount has it's advantages and disadvantages.  6 of one... a half a dozen of another...

[Bogan]

hmmmm, no machining or welding will make things difficult, the swingarm mount is a simple solution, but it increases the unsprung weight which affects suspension action, and still must be made rigid enough to ensure it won't rattle around and wear out its mount during riding. But as you say, without welding or machining your options are limited.