Im probably the worst person to ask for electric motor stuff
But keeping in mind you do not need "flight" hardware, you should be able to locate a DC electric motor that is fairly cheap (ie, big fat and heavy) that will do the job. Im not sure a dimmer switch will handle the current though.
Perhaps ask that one in the electrics forum.... ??
As for props.....
http://pages.prodigy.net/gcleveland_...ls/index6.html
Try Cleveland.. see what they might have.
Also perhaps email Windy....
http://www.windyurtnowski.com/
He may have a few good sources for CL carbon props of the right size.
Also....
You can use good wood props. sometimes those are stronger than all others. Try and find rev-up 11x4 props.
And as long as you are very careful in your testing, and since the prop will not see a flight load, you can probably use the APC prop as well. (You will have to be careful regardless of the prop type and size...)
Bob