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Re: Setting Whirlwind GA-RW3B pitch on 912ULS
IMO the Whirlwind recommendations do not make any sense and the Rotax requirement of keeping RPM above 5200rpm at wide open throttle upon climb is the important one to satisfy. Whirlwind says to set the WOT static rpm to 5100-5300 but if I set the static WOT to be anything less than 5200, I wont be able to satisfy the Rotax requirement. Here is what I found:
17.0 degrees: WOT static cant be tested without exceeding 5800rpm
19.4 degrees: 5450rpm WOT static, 5500rpm 65mph climb
20.2 degrees: 5330rpm WOT static, 5340rpm 65mph climb
21.0 degrees: 5050rpm WOT static, 5060rpm 65mph climb
Again, no idea why they recommend 17 degree pitch as the starting requirement because it does not meet their own recommendation of WOT static 5100-5300rpm. I'd rather keep at least 100rpm over the 5200rpm minimum specified by Rotax so I will be using the 20.2 degree pitch setting.
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