> > Yes the idle might be a problem.  Power Sport and others put
butterflies close

 > to the rotor housing and claimed the idle was much better but I don't
 > have any numbers. On the other hand with a 2.85:1 PSRU the engine can idle
 > at 1750 RPM while the prop is turning only 600 RPM. About the same
 > as most direct drive AC engines can idle. I am almost certain a
P-port with
 > the throttle close to the rotor housing will idle at 1700 RPM.
 >
 > Here is a P-port slide throttle that is worth 10 or 15 HP over
butterflies.
 > I am working on designing a sheet metal version that will be cheaper to
 > makes.
 >
 > Paul Lamar

 > "Echo Lake Fishing Resort (Georges Boucher)" wrote:
 >
 > Hi! Paul
 > Ivopro's site shows an electrical in flight adjustable prop &
Warp drive doesn't  show a controlable prop.
 >  Did you have it mixed?
 > Thanks.

 >  & Gail Boucher
 > 2126 Creighton Valley Road
 > Lumby, British Columbia
 > Canada  V0E 2G1
 > (250) 547-6434
 > www.echolakefishingresort.com
 > www.echolakefishingresort.ca

 Yes that is correct. IVO is not really a variable pitch prop
however. The blade
 is twisted rather than pivots like a true adjustable pitch prop.

 The Warp Drive is ground adjustable. Also as Ken mentioned you can add
 more blades for more blade area. Ken has years and years experience
 with rotary powered Coots. Here are a couple of pictures of Ken's Coot.

 Apparently blade area pays off in high static thrust for getting you
 up on the step and off the water. Sensenich makes air boat props with
 lots of blade area. Here is a shot of a Sensenich air boat prop.
 This one is also ground adjustable.

 There are other ways to go. You could use a Mistral gear box that
has provisions
 for a hydraulic constant speed prop. Cost is around 7,000 as I
recall and another
 500 to 1,000 for a governor used or new. Then there is the prop it
self at 2,500
 to 6,500 used or new.

 Another way is to use the Tracy Crook gear box and a German
Hoffman or MT electric
 prop.  About 3,000 for the gear box and 10,000 for the prop all US dollars.

 Frankly with a Christavia sea plane on floats take off and cruise
speed are pretty
 close together due to the high drag so a ground adjustable prop
like the Warp Drive
 or Sensenich is the low cost way to go. You will see little advantage with
 a true adjustable pitch prop.

 Paul Lamar

 David Staten wrote:

 What kind of plane is this, Paul?


 Dave

It is a Coot amphibian.

BTW Ken, what is your new web site URL?

Paul Lamar

  It is,

  http://homepage.mac.com/rotarycoot/

   Ken

Thanks Ken.

Paul Lamar
 
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