On Oct 8, 10:35*am, MarkW wrote:
I have not been able to locate the yahoo ac4 group...

Here's the URL:

http://groups.yahoo.com/group/ac4/

...I have found an 8" dia plastic hub wheel that may do
the job. *It looks like a lawnmower wheel, and has a weight
limit of 55 lb...

I think that is unlikely to give satisfactory service, even with
revised bearings.

Thanks, Bob K.
http://www.hpaircraft.com/hp-24