Today was a real sanity check for the SAP. It was referencing against glow engines (1 2 stroke and 1 4 stroke...the other 7 or 8 were electric). I went to the first contest with this comination...SAP/ES30G turning a cut down wood carbon hybrid prop. I didn't try the 17x12.....

Bottom line, engine and the cut down version of this prop was noisier than I had observed in earlier runs. My set-up is not quite where I want yet.

The dominant noise maker sounded like the flapper intake valve to me. Curious to know if a rubber lining on this valve could reduce the noise. I will discuss this with Todd as soon as I have the opportunity.

Nevertheless, the sound of the SAP gas engine was totally unique out there...completely different than anything else flying