larry(at)macsmachine.com
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 Posted: Fri May 08, 2009 6:19 am Post subject: [Probable Spam] Prince P-tip propeller |
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Hi Ben,
Differences between a 80 hp Rotax and a Jabaru 2200 is apples and
oranges. The Rotax is a redrive which is heavier and needs to use the
rpms best for torque.
The Jabaru is lighter and with the extra rpm, smaller prop it's a draw
but for being lighter. I believe the lighter Jabaru has the edge here
for best flight characteristics.
There are quite a few Prince P tip props for sale everywhere which
suggests that the long diatribe on prop efficiency may be more sizzle
than steak.
Good marketing does not make an efficient prop. Warp drive probably has
a better STOL answer for you.
Larry McFarland 601HDS at www.macsmachine.com
Benjamin Q wrote:
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I am going to put a Jabiru 2200 on my 701. I have been looking into using a Prince P-tip propeller. Supposedly the p-tip allows a blade of smaller diameter to be as effective as a larger propeller because the tips "delays the tip vorticies which cause drag and turbulence within the propeller arc." They also claim that "a 72" diameter propeller without a P-TIP will give a volume of air from the propeller of approximately 68" in diameter; a P-TIP propeller will provide 72" of air volume."
Additionally the propellers are said to include automatic pitch changing. "The propeller has a fixed pitch that relies on the forward pull of the propeller to automatically provide pitch change proportional to the amount of force being applied to the propeller disk."
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