Peter,
I have an IO-360 (180 hp) and a 200G from the other Whirlwind company. That is definitely not the prop for you. There are two Whirlwind propeller companies.
http://www.whirlwindaviation.com/index.asp and
https://www.whirlwindpropellers.com/ I think that Bill Bellmore at Crow Island has a Sensenich ground adjustable on his Legend with an O-200? check this one:
http://www.sensenich.com/products/item/138 I believe that it's simpler to adjust than the Whirlwind GA200.
Back on the C90 prop topic -
In between trying to winterize boats I'm still on the hard hunt for a better prop, and it's sadly made me a bit bitter(?) or frustrated (?). I always find it amazing that it's so hard to spend money with a company that you think would be very interested in both an educated customer and a happy customer. I'm not negotiating price, I'm trying to buy the right item!
Although I've tried to get some response from them, it seems Catto has pretty much written me off as a customer. No response at all since taking the prop back, and no comments on why their suggested prop was so far off.
In the meantime I've reached out to both Whirlwind and Sensenich. No response from Whirlwind yet, but Sensenich did get back with me, and I learned a few things.
If someone knows better please correct me.
~ The 2EK/C72AE prop is no longer produced, as I understand it. Continental had pretty much disavowed use of it due to harmonics, and so Sensenich moved to a different style hub and prop. No issues, just felt it was the right thing to do, and all good.
~ They had been talking about it for awhile, but they have come out with a 76" ground adjustable composite prop.
He didn't have numbers, but he guessed it would probably be adjustable in the 34-42 inch pitch range, although they use a pitch pin gauge for adjustment over the previous cartridge style.
He mentioned that Legend loves the 76", (but that may be a fixed pitch 76"), as he also said that he didn't have any of these out in the field yet. The ground adjustable prop number is a
2F0K6C76AF-0.
One other thing of note which makes sense.
A laid up prop with a varied twist, that takes advantage of the hp at different parts of the blade at different speeds, is the best way to do things, such as what Catto does. And on an RV, fast LSA, etc, at 130+ speeds that may make a 1-2% difference. But at 85-90-100 mph, in a Cub.... probably not worrying about if the blade pitch is optimum design for the speed you are running. Close the door for your 2%.
So, I told him if he could get me one in time to use for the WAD event, I'd be his guinea pig. He checked and thinks they can do it, so looks like he'll be happy to take my money.
I'll let you know at the WAD.
pb
