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Re: Constant Speed

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PostPosted: Fri Jan 06, 2006 2:40 pm    Post subject: Re: Constant Speed Reply with quote

I have a blended airfoil Hartzell which, based on others' performance numbers (i.e. Vans, Randy Lervold, etc), seemed like the best bang for the buck. But I can't comment on performance yet myself as I'm waiting on FAA and weather to get flying...
One piece of advice I do have: If you decide to put a Sensenich on initially with a desire to upgrade to Hartzell later, leave a bit of extra gap between the spinner and the cowl when you fit your cowl to the Sensenich setup. Laird Owens made the swap a few years ago and found that the Hartzell installation reduced the gap by 1/8-3/16". I had a Sensenich at the time so I set my gap on the large side at 5/16". When I recently swapped it out and put a Hartzell on, sure enough, the gap was so tight I could hardly get the cowl on and off. The plans call for a spacer (I think it's 1/4" thick--it comes with the Hartzell prop) plus a washer to go between the prop hub and spinner backplate. I removed the washer and left only the 1/4" spacer. This moved the backplate forward a bit and resulted in a tight fit, perhaps 1/8", but allows me to get the cowl on and off and looks nice. If you were to set it up for a really tight fit with the Sensenich and later convert to Hartzell you'd be grinding paint and fiberglass off the front face of your cowl and I think we can all agree that would NOT be FUN.
Happy New Year and good luck with your decision.
--Mark Navratil
Cedar Rapids, Iowa
RV-8A N2D in T-6A colors, ready for final inspection...
From: "Dana Overall" <bo124rs(at)>
Subject: RV-List: Constant Speed
Anyone got any personnal choices for good C/S props for an O 360A1A? As you
can see, I've sold the rotary and am planning on putting a new 360 hollow
crank. The idea right now is to go fixed with the option of going C/S or
going hollow and just dropping the bucks and going C/S.
Gotta put some numbers together. Time to fly this think!!!!

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