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Contra rotating propellers

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Dave Hodges

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Reidsville, GA
Does anyone know where I can find a contra rotating propeller mechanism? This is a setup that has two propellers on the same axis. One drive shaft is inside the main pipe. The other drive shaft is outside the main pipe. The drive shafts are coaxial and each has its own pulley and propeller. Each pulley has its own engine.
 

blane.c

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capital district NY
ENGINES FACING EACH OTHER.PNG Wouldn't it be simpler to just mount the two engines with the propellers facing each other?
 
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Dana

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For what size engines?

The old Paraplanes had a setup like that with two 15HP Solo engines. It's not a popular setup because the complication usually isn't worth the advantages, if any.
 

Dave Hodges

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Jun 29, 2014
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Reidsville, GA
For what size engines?

The old Paraplanes had a setup like that with two 15HP Solo engines. It's not a popular setup because the complication usually isn't worth the advantages, if any.
It would be for a couple of Suzuki 993 cc engines.
 

Jimstix

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Sep 29, 2012
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LAS CRUCES NM
Why? The added weight and complexity will overcome any performance advantages of a dual-rotation propeller. Simplicate and add lightness.
 
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