Mark, Sounds as though you really have it figured out now with the 3100.
My guess on the prop is this; you have lost some flat plate area (drag) with the Sterba but the increased pitch is just a little too much for the engine. I'm sure you already know this though. It would seem to me that a 54X56 or a 54X57 would be the perfect ticket. The larger diameter prop is better for climb and a slight increase in pitch would slow your RPM down slightly (200-250) and still provide you with that 170MPH you are getting. But again, I'm sure you already know this. Sure want to see the numbers after you've cleaned up though. Probably won't help the climb much but your top end and fuel consumption should change quite a bit. It might even make the Sterba look good. After all, you should see a 7-10mph or possibly more in top end depending on how much it's cleaned up. Fred Johnson Reno, NV -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Monday, April 02, 2007 7:35 PM To: KRnet Cc: Corvair engines for homebuilt aircraft Subject: KR> Sterba prop data vs Sensenich NetHeads, I should have waited for a 59 degree day, but it was pretty much gorgeous this afternoon, so I flew the 52x60 Sterba prop on the new 3100cc engine for the first time today. Although I didn't really plan it, I did a 0' AGL to 7500' climb test, then leveled off at 7500' for a wide open throttle test, then pulled the throttle back to idle and did a glide test / simulated engine-out thing just to see how far I could glide.
