12
Chris Hoskins,
This particular Bolly configuration is our solution to overcome the
Bolly self-imposed limit of 125 HP per prop. With this setup, the
propeller system will absorb your 250 HP with ease. The Rotary engine is
very kind to propellers as well, unlike a Lycoming 0-540 260 HP direct
drive engine.
The Bolly guys make a great product and they will customize their
products to meet custom applications. Their blades are stiff and light
with a tough leading edge that is as hard as roller blade wheels. Craig
said they will use a blade profile that will favor a high cruise speed.
Warp Drive makes a similar propeller for airboats, but they won’t sell a
prop for an aircraft with a “canard”. We have been a distributor for
their props for over 18 years now. Attached is a picture of the Warp
Drive airboat prop that uses a similar configuration. The Bolly blades
run quieter and spin up faster due to their shape and lower mass.
Call or write if you have more questions.
Thanks
Ron
Hoverhawk Corporation
www.HovHoverhawk Corporation
www.Hoverhawk.com
www.WarpDriveProps.com
www.BollyPropellers.com
Telephone: 1-251-609-0969
Email:
hoverhawk@gnt.net
Telephone Business Hours:
8 AM to 6 PM Central Time
Monday through Saturday
In USA
INCLUDE A COPY OF THIS
EMAIL WHEN REPLYINGerhawk.com
www.WarpDriveProps.com
www.BollyPropellers.com
Telephone: 1-251-609-0969
Email:
hoverhawk@gnt.net
Telephone Business Hours:
8 AM to 6 PM Central Time
Monday through Saturday
In USA
INCLUDE A COPY OF THIS
EMAIL WHEN REPLYING
Hi Ron,
Sorry about the delay in replying (been busy). It seems like a
very interesting solution for sure. I have checked out the Bolly web
site. Do you have any other pics/sites for this prop ? i would like to
do some further research on it. There is no huge rush here, I have left
myself plenty of time to find out these sort of things.
Cheers Chris.
Chris,
We came up with a great pusher propeller to load your 250 HP at 2880
prop RPM for high cruise speed, based on the information you provided.
It is a 6-bladed 64” carbon fiber composite prop. It is a tandem 3-blade
with the aft 3-blade prop blades clocked 60 degrees offset/trailing the
forward blades for increased efficiency. The aft prop blades would be
set a few degrees higher in pitch than the forward blades. This
configuration is more efficient than having all 6-blades in the same
plane, or all in a row, equally spaced.
My company is a world-distributor for Bolly propellers and Bolly is the
manufacturer of all of this propeller’s components. The BOS3 blades will
include the Dura-Tuff leading edge protection, carbon fiber composite
construction and a custom blade profile for speed. Individual blades are
replaceable if damaged beyond repair. Blade pitch is infinitely
adjustable to load the engine at the RPM you want for takeoff and cruise.
The hubs are made of “the best aviation grade 7075 T6 series alloy plate
(not a cheap casting) and treated for corrosion resistance (hence the
gold colour).”
The prop would be shipped direct to you from Bolly Aviation in AU, if
you like this propeller. Your cost is $2,456 USD, plus $50 TNT shipping.
My company (Hoverhawk Corporation) will be using this configuration on
other customer applications world-wide (fast or slow movers) whenever a
reduction drive is between the engine and the propeller and the engine
power is greater than 125 HP.
We all believe you we be very happy with this propeller system. Thank
Peter and Craig at Bolly Aviation for making this propeller possible.
Let us know what you think about it!
Thanks
Ron
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If it is ground adjustable like the warp drive it will work.
You can make your own adjustable hub with as many blades as you
want. Buy just the blades. You can buy blades now from half a dozen
prop makers including Sensenich . They are all doing the warp drive hub.
So far the Sensenich blades are the best but there are other copies
out there. The warp drive blades have no twist so they are not good
for a wide speed range.
The prop on this coot really works. It pops out the water like a scolded
goose when the rotary runs on NOS. About 200 HP without NOS.
About 300 with NOS.
The front and back plates are about 13 mm thick.
Paul Lamar
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