Bigger spinners !?

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Dan Thomas

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Well I wasn't joking. It would be a possibility if you run a fuselage prop at the front with electric engines ( 4 engines running a ring propeller ).
Plexiglass spinners won't be seen anywhere, in any size, IMHO. The centrifugal forces would tear them apart, not to mention the assymmetric drag loading of the spinner at higher AoAs. Aluminum spinners suffer enough as it is, and if they crack they can come apart catastrophically. People have been killed by busted spinners coming through the windshield.
 

Retroflyer_S

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Plexiglass spinners won't be seen anywhere, in any size, IMHO. The centrifugal forces would tear them apart, not to mention the assymmetric drag loading of the spinner at higher AoAs. Aluminum spinners suffer enough as it is, and if they crack they can come apart catastrophically. People have been killed by busted spinners coming through the windshield.
Fairly large spinner with enormous sized props would rotate very slowly.

Plexi could be bullet proof.
 

Sockmonkey

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Actually if it's an electric prop the spinner can be stationary while the prop encircles the front of the plane on a sort of maglev track thing.
 

Kiwi303

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the magnets would be too heavy on a true Maglev system, and plain bushings would have too high a friction loss, you'd need roller bearings, ball bearings at the minimum.
 

Dan Thomas

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Right it would not have to be rotating...due to pressurization. It could be organized.
It couldn't pressurized without being very thick. I have worked on pressurized airplanes, and the windows are kept small to reduce the area the pressure is working against, and the windows are thick and of several layers. Lots of weight. Not something that makes sense for a huge spinner, rotating or otherwise.

Small pressurized airplanes, like the Cessna P210, suffer an enormous weight penaly for the privilege of flying high. The whole cabin structure is beefier, including the skin, firewall, framework, floor and its inspection panels (they're all sealed, too), the windows are smaller and much heavier, and the pressure source, it heating and cooling and controls add more weight and complexity. All that cuts into the airplane's performance and useful load.
 

autoreply

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It couldn't pressurized without being very thick. I have worked on pressurized airplanes, and the windows are kept small to reduce the area the pressure is working against, and the windows are thick and of several layers. Lots of weight. Not something that makes sense for a huge spinner, rotating or otherwise.

Small pressurized airplanes, like the Cessna P210, suffer an enormous weight penaly for the privilege of flying high. The whole cabin structure is beefier, including the skin, firewall, framework, floor and its inspection panels (they're all sealed, too), the windows are smaller and much heavier, and the pressure source, it heating and cooling and controls add more weight and complexity. All that cuts into the airplane's performance and useful load.
Aircar once started talking about transparant glassfiber. Should be feasible, even Lexan has enough strength for fairly light-weight pressure vessels.

As for big spinners... my design has a really big once, being almost 20" in dia. Pushers have different rules.
 
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