Hi,
I'm using a 52"x44" home-made wooden prop with my VW-1835.
Max rpm is 3300 if my memory serves.
Regards
Jan Hed�n, SE-XFR, Dfly Mk.2FA
[EMAIL PROTECTED] skrev:
> Hi all:
>
> My Dragonfly was built in CA and most of the hours were flown in CA.
> I need some input on props. The previous owner had 2 props, the one he flew is
> a Great American 52X42. The other one is a Sturba 52X44.
>
> Max RPM with the 42 is 2900, and for the 44 is 2600 at 4500 MSL, at these
> RPM's I am below peak output for the VW.
>
> I have a HAPI 1835 with Mosler individual heads , total time less than 300
> hrs.
>
> I talked to Great Plains and they said that they like to run their VW's at
> 3400 to 3600 RPM.
>
> I have calculated the tip speed at these RPM's and it is close to 900 fps.
> Is any one running a 52X40 prop and if so any problems with that pitch?
>
> I am based at 4470 MSL and have 11,000 ft MSL mountians all around me and need
> to be able to climb well. The ballpark calcs show that top speed should also
> improve a bit with a lower pitch prop.
>
> Any advice or experiances with selecting the right prop would be appreciated.
>
> To date 5 hours and 25 landings
>
> One Sky Dog
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