I havent heard of this 21cc engine from vv. Ill have to check it out. I thought about trying their 20cc engine. I dont like how the muffler points away from the head (for side mounting it on a 3d profile plane i assume).

I just got a reply from Southwest Aerovista hobbies the 26cc BM is available. Its not listed on their site so i dont know the price. Ill let ya'll know what i find out.

for the RCGF reputation, ive heard their old 26cc was junk, but the 20cc bm has been said to be good as well as some other bigger engines. And this looks like a larger bore version of their 20cc bm.