RE: Testing the new NV (Norvel) .40 size (6.5cc) gasoline glow engine
Have to agree with you on the AX 40 for the small, fast planes. Light weight and high rpm. I use it where I used to use a 32 or 28 and really haul.
Do you know which tuned pipe header fits it? I have 3 for my 25 NVs that work great (got them off fleabay from an ex-racer) I know the 40 responds like the OS with the increased exhaust volume. I played around by making a 1" extension to fit between the front and rear of the stock muffler using a longer bolt and picked up another 1200 rpm with the small props, so thinking it would do well with a tuned pipe too.