Hello All:

      While flying the above engine I notice that it does not run in a nice 4 cycle mode.  There is no problem with running this engine in a wet 2 cycle mode.  I was wondering if this engine is not designed to run in a 4 cycle mode.  In the four cycle mode, it runs very rough but when leaned out a bit it runs in a very smooth 2 cycle.

      This is not a flying problem but just a question about the HP Gold Cup .40 engine.  This Gold Cup is a joy and pleasure to use.

      Comments?

                                                                                                                  Tia,

                                                                                                                  Frank McCune

     Hi Brett:

     I think that you got it correct!  This engine loves to operate in a wet 2 cycle.  So, why insist that it operate where it is not happy? Lol.

     I would like to use 11" props but the grass is a bit high for that where I fly.  Perhaps a good 3 bladed prop would be the answer. An 11-4 or an 11-5 prop appears to be a good choice for this engine.


                                                                                                              Be well,

                                                                                                              Frank