E, Ive been thinking of doing that very experiment, my most logical candidate for a fourstroke would be my Saito .72, my Saito .80 has really high compression but may be suitable. For a two stroke I would have to get some fuel, all I use is Fox 5% nitro with 20% lube and the only suitable candidate I have would be my OS LA .65 or Enya .50CX which is very loud. All the rest are Fox or European 0 to 5% nitro type engine. I shall theeenk upon it some more but keep it under the headache limit. Offer suggestions. For example, does a ST .51 run OK on 15% nitro?