carl(at)flyers.freeserve.
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 Posted: Wed Jan 11, 2012 3:39 am Post subject: Europa-List: Re: VP prop, good idea? which one? |
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Hi All,
Having recently fitted a CS prop (in the last 9 months) I am inclined to
agree with Peter when he says the VP prop is either optimised for take-off
or cruise performance - although it gives much more flexibility when
compared to a fixed pitch.
We fitted our Woodcomp prop in the belief that it would significantly
improve the take-off but IMHO it has made little difference compared to the
original fixed pitch Warp Drive prop. I have concluded this is because we
have an 80 hp engine and there is a limit as to how much power you can get
out of the setup. The limiting factor is of course the maximum RPM (5,700 on
take-off).
Where we have noticed a significant improvement is in the cruise. Previously
the maximum indicated speed in cruise was 135 kts - this has now increased
to about 145 kts. The reason I say indicated speed is because I believe our
ASI over reads by about 5 kts. There has been no increase in fuel burn and
if anything it is better (which is what you would expect).
Using a 912S or 914 there should be greater benefits/ improvements using a
VP prop especially with regard to take off performance.
Regarding our choice of propeller (ie: Woodcomp) there have been some
adverse comments posted in the past. All we can say is that overall are very
pleased with the Woodcomp and fitting a VP prop has certainly transformed
the performance of the aircraft (in many ways - also much smoother running)
. The controller we are using is the Smart controller which is very easy to
setup and use.
Just my 10p worth!
Carl Pattinson
G-LABS
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