humptybump
Well Known Member
About 18 months ago, I received a Catto propeller for my 150hp RV-8. Recognize that that particular combination is rare if not unique, Craig had to calculate the propeller.
He had imaged I would see 2750 max rpm and 4kts more speed - based on the data I had collected from my Aymar Demuthe propeller. He hit the 2750 perfectly and extensive testing (using Box Axom's test procedure) showered 3.75kts improvement. The engine CHTs dropped 15 degrees and oil temp dropped 10 degrees.
Fast forward 12 months and I had an issue with the paint on my propeller (likely because I had previously sent it back to change the paint scheme). Craig fixed the paint issue and went two steps beyond. First, he offered to change the paint color while fixing the issue. Second, when the prop came back, he had improved it.
Craig changed his nickel edge treatment slightly. When I unboxed my prop, he has added leading edge tape from the hub out to about 3/4" overlap of the nickel. As you can see in The pic, the nickel runs out and along the tip.
Craig makes an amazing propeller and he never stops trying to improve his product.
At the risk of posting prop-porn, here is a visual example of how "engineered" is the Catto propeller ...
top is a Catto propeller, bottom is an Aymar Demuthe
He had imaged I would see 2750 max rpm and 4kts more speed - based on the data I had collected from my Aymar Demuthe propeller. He hit the 2750 perfectly and extensive testing (using Box Axom's test procedure) showered 3.75kts improvement. The engine CHTs dropped 15 degrees and oil temp dropped 10 degrees.
Fast forward 12 months and I had an issue with the paint on my propeller (likely because I had previously sent it back to change the paint scheme). Craig fixed the paint issue and went two steps beyond. First, he offered to change the paint color while fixing the issue. Second, when the prop came back, he had improved it.
Craig changed his nickel edge treatment slightly. When I unboxed my prop, he has added leading edge tape from the hub out to about 3/4" overlap of the nickel. As you can see in The pic, the nickel runs out and along the tip.
Craig makes an amazing propeller and he never stops trying to improve his product.
At the risk of posting prop-porn, here is a visual example of how "engineered" is the Catto propeller ...
![20131216-211337.jpg](/proxy.php?image=http%3A%2F%2Fthesalmonfarm.org%2Fwp-content%2Fblogs.dir%2F1%2Fuploads%2F2013%2F12%2F20131216-211337.jpg&hash=aed2a69dca0095c3cd485ee33a4e6f1f)
top is a Catto propeller, bottom is an Aymar Demuthe
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