I had a TT 61 Pro two stroke in mine for a while but it wasn't a success. Could only just hold a hover with it and it was damn noisy too. More nitro would help, but we're pretty much limited to 5% here on cost grounds. Have an ASP 91 four stroke in it now but have yet to get out and fly it, just can't get the right combo' of free time and good weather! It should be a nice combination though, fingers crossed.