X-mailer: iolo System Shield 10.7.6.28
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
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Peter Jeffers
Sent: 11 January 2012 09:17
Subject: RE: Europa-List: Re: VP prop, good idea? which one?
--> <pjeffers@talktalk.net>
HI Graham,
What I had meant to infer was that the fixed pitch props work ideally for
cruise OR take off, depending on how you set them. They are a compromise
every where else.
Sorry for the confusion. It must have been the wine??
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of graeme bird
Sent: 10 January 2012 20:05
Subject: Europa-List: Re: VP prop, good idea? which one?
Thanks Pete, yes I know its 5800 for a brief period only (5min) - but thats
long enough to take a speed reading.
Why did you say TO performance OR cruise, surely you improve both by setting
fine for take off and course for cruise. What speed would you expect in the
cruise?
Regards
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Warp drive FP Just Test Flying to obtain permit
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=362968#362968
-----
No virus found in this message.
Checked by AVG - www.avg.com
_______________________________________
No infections found in this incoming message Scanned by iolo System Shield.
http://www.iolo.com
_______________________________________
No infections found in this outgoing message
Scanned by iolo System Shield
http://www.iolo.com
|