The planes that I was wanting to convert are in 2610 Combat ( http://rccombat.com/index.asp ), which are WW II 12th scale fighters, ( plus or mnus 10% ). so they are scale streamlined to go fast, I thought with a full cowl ( usally partly open to non-exsitint on the nitro ones ) would be even better.The AUW averages 2.5-3.25 lbs., average WS 39-48 inches..Thanks for your help