Thanks, it looks as though not to many people are trying to do what I want to do. I have a Mamba Sidewinder (1/10) that I want to use in a TC for "stock" class. I already know that it won't drive a 17.5 to well.(cogging) So I'm looking for a Delta wind to get as close as I can. I was hoping the Feigao 16S (KV 2218) would suffice. The idea was to find a 540 size Delta wind motor that my Sidewinder would drive successfully and then hope that if I get to a race they would let me run it in "stock" class. Thanks, Don