zeus45601(at)yahoo.com
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 Posted: Thu Jul 23, 2009 4:47 am Post subject: 4 bladed Props |
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JG;
I was browsing your VG website and came across your propeller study. I saw the pictures of the bright orange 4 bladed Brolga propeller for UltraLights and really liked its looks. Do you know of any manufacturers who make them to fit an 801? I believe I'd need a propeller with shorter blades as I am considering getting the Rotec R3600 radial, 150 hp engine which has its shaft central compared to other engines like Lycoming, Franklin or Jabiru which place it's hub higher up on the engine's frame. The centrally placed hub of the Rotec will lower the distance to the ground, so I'm going to need shorter blades. Zenith recommends an O-360 engine fitted with a fixed-pitch Sensenich 76-EM8-0-54 metal propeller. It's hub appears to be about 6 inches higher on the Lycoming in relation to the plane than it would be on a centrally placed hub of a Rotec R3600 engine, making the blade length around 70 inches on a Rotec instead of the 76 inch on the Sensenich.
Propeller science is new to me and I was surprised that the different propellers you used in your tests and studies achieved all pretty close to the same results. Anyhow, I haven't started this CH-801 yet, but I'm diligently doing as much research as possible before I start this project. I'm pretty much convinced now to buy the VGs for both the wings and elevators instead of investing in a leading edge slat kit (I can always add them later if needed), but I just couldn't find much information for a layman regarding propeller characteristics, proper pitch, lengths, materials, etc, until your study. Thanks for all your work and effort. That was why I was happy to read your section on props even though it was research on the blades for a 701/Savannah and not the 801, it pretty much told me that propellers are propellers, you just need to know if you want better cruise or climb abilities. Do you or any of the readers know of a manufacturer of props who can make a 4 bladed, 70 inch blades, set for best cruise performance, composite material and rated for 150hp engines? I know you are asking...why 4 blades instead of 3 or 2. I just want 4 blades.....heard they are quieter and I believe it would look better with the radial engine.
Thanks;
Jay
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