One of the Zenair pilots at my field has been in contact with Craig Catto a
t Cattoprops.com. Craig confirms he is
testing a ground adjustable prop for the LSA market (think Rotax) and is te
sting it against the Kiev prop. He says
it is significantly better than the Kiev so this is great news. Catto make
s racing props so knows a thing or two
about prop twist. I have 45 deg twist on my fixed pitch 64x62 three blade
Catto. Craig is very hard to get ahold
of and is usually easier to get on the phone rather than emails.
Glenn
> From: fklein@orcasonline.com
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Constant Speed Props=2C etc.
> Date: Fri=2C 20 Mar 2009 18:12:56 -0700
>
>
>
> On Mar 20=2C 2009=2C at 2:00 PM=2C Paul McAllister wrote:
>
> > I am not an aerodynamicst=2C not even an amature one but I was
> > wondering why you didn't think the Kiev blades will be much of an
> > improvement over the Warp Drive blades.
>
> Bud=2C
>
> I too was surprised at your apparent skepticism as to whether those
> Kiev blades may offer improvement over the current WD blades in the
> Airmaster hub.
>
> I had several long emails w/ Martin on the subject...perhaps 2 years
> ago...and my recollection is that he was quite candid about the WD
> blades being less than optimal given the flight envelope and length
> limitations of the blades for the Europa. My understanding is that
> the WD blade stock is much longer=2C and when cut down to length
> required=2C they lose much of their twist...to such an extent I've read
> that the inner portions of the blades create negative thrust under
> certain conditions. I've speculated that the relative lack of twist
> may be a factor in engine cooling...just speculation=2C I have=2C of
> course=2C no direct experience.
>
> Assuming that the "432" references a new hub=2C I hope it's available
> with other than a Rotax flange.
>
> Fred
>
>
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