A couple more points regarding the Charity Race in Parkersburg, WV:
The club NORMALLY runs stock and 19turn (they call it modified) on FOAMS.
For these larger events, they require a minimum of 6 entries to make a class. They will be allowing stock and 19turn rubber if there are enough people for it.
Basically, if you're going to run 19turn rubber...bring friends and organize yourselves for 6 entries. There should be no problem getting 6 for stock rubber. As a backup plan, the 19turn rubber crew should bring along a stock motor, just in case.
For the stock class, they allow all the ROAR approved stock motors, and the Binary2 as well. Might want to ask about the Integy KOS.