Andrew;

Thanks for the data. It looks like the Klotz would be the issue then with that fuel. I think it a good fuel, but for the 1/2a Cox engines a full castor is the ticket. I am going to find a shop that can get the raw parts and mix a 25% all Castor fuel.

The fuel may not have caused this failure, it may have been a week part or whatever, Am still going to look into that full castor based fuel blend.

Thanks to all the input guys!