Robin Ream wrote:

    I'm building a Velocity, and that's one of the airplanes with the

propeller on the wrong end

;-)    A unique problem we have is the relatively small prop diameter

necessary to give us

adequate clearance on rotation, and here comes the can of worms:  The

factory recommends no larger

than 67 inch prop diameter to give reasonable clearance on rotation and

landing.  --  I'm using

the exact same 20B engine set up as Tracy Crook so there is a lot of

horsepower to absorb.  --

Since I can't swing a big prop, it opens up the debate on redrive ratios

again (however I've

already got the 2.17, so that's what I have to work with anyway, but in

this case it might turn

out the best ratio by default because of the short prop length.)
    What speaketh the engineers?  How do you turn a whole lot of HP, the

limitations of a short

prop, and a thin wallet into something useful?  ----  I'll bet this makes

the RV look like a lot

less work doesn't it :-)

Thanks guys,
Robin

More blade area.

Paul Lamar

Vaughn Mann wrote:

Some I would consider Robin, MT's electrically controlled pitch three blade
as first choice but expensive, then the Catto composite ground adjustable
three blade and finally the "Performance Propeller" wood three blade.  In
fact I think it is around $2,600 currently.  It is very strong, as it is
used on 300hp IO 540's for aerobatics and has never failed unless something
broke away and flew into it.  I think they are in Arizona.  I'm Certainly
not an Engineer but I've met Ed (Stir up the pot) Anderson.  Does that
count?  Vaughn.

 
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