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Which Prop

 
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peter.rees01(at)tiscali.c
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PostPosted: Fri Feb 03, 2006 12:37 pm    Post subject: Which Prop Reply with quote

I know that this may descend into the mono vs tri-gear, 912s vs 914
arguements but I'll ask the question anyway:

G-MFHI is fitted with a 912 fitted with a coursly set (18 degrees)
warpdrive - This returns a respectable 118-120kts and a rate of climb that
doesn't cause concern over the trees at Rochester.

The course setting of the prop limits the engine RPM to about 5100 so we
can't legally use the weight upgrade.

If we were to fit a VP/CS prop, we would see the requsite increase in RPM
and could therefore use the 1370 limit.

My question is - would a change to (what looks like) a prop with a more
spohisticated blade design such as the Kremen give me any advantage in the
cruise? If so, does anyone have any comments (positive or negative) which
prop (Rospellor, Kremen etc) may be more suitable to fitting to a Classic
912 - which is about to have the engine removed for sprag clutch replacement
Surprised(

Peter


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terrys(at)cisco.com
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PostPosted: Fri Feb 03, 2006 3:15 pm    Post subject: Which Prop Reply with quote

We flew over 100 hours with a Whirlwind 2-blade prop which looked much 'heftier' than the Warp Drive/Airmaster props. We later-on converted over to the Airmaster prop with Warp Drive blades. We were able to measure no difference in climb or cruise performance, but did see an increase in braking effect with the throttle closed, with the Warp Drive producing greater drag.

Just a random comment, for what it is worth.

Terry Seaver
A135/N135TD
Mono-wheel XS with 912S


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bryan(at)blackballclub.co
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PostPosted: Fri Feb 03, 2006 3:29 pm    Post subject: Which Prop Reply with quote

Hi Peter,

I do not know the Rospellor prop, and can make no comparisons.

I have converted my XS to Kremin CS. This enables more efficient, smoother
performance in cruise, but does not seem to seriously improve take off
performance. You should note that the extra weight involves will seriously
detract from useful payload, possibly by as much as 20 pounds.

The consensus is that the conversion is worthwhile with the 80 horse 912 on
short fields. The 100 horse 912S makes the conversion les relevant,
particularly when using longer strips.

You will get plenty of conflicting advice on this I am sure, but my personal
opinion is that the fixed pitch did not come a poor second place. I would
not convert back now that I have spent my money (2300), but perhaps I could
have installed autopilot, or something else to more advantage with the
money.

Cheers! Bryan. G-BYSA XS Mono.
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rholder(at)avnet.co.uk
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PostPosted: Fri Feb 03, 2006 3:48 pm    Post subject: Which Prop Reply with quote

Quote:
The course setting of the prop limits the engine RPM to
about 5100 so we can't legally use the weight upgrade.

If we were to fit a VP/CS prop, we would see the
requsite increase in RPM and could therefore use the
1370 limit.

My question is - would a change to (what looks like) a
prop with a more spohisticated blade design such as the
Kremen give me any advantage in the cruise? If so, does
anyone have any comments (positive or negative) which
prop (Rospellor, Kremen etc) may be more suitable to
fitting to a Classic 912 - which is about to have the
engine removed for sprag clutch replacement Surprised(


You will end up with the catch 22 position. The extended
baggage bay which increases the MTOW by 70 pounds to 1370
itself weighs at least 20 pounds !

The upgrade from Warp Drive to Airmaster with WarpDrive
adds another 10 or 15 pounds - I don't have the actual
figure in front of me.

So the extra expense and effort will only increase your
carrying capacity by 35 pounds !

Two steps forward and one step back. Net progress one step
at about 2500 !

Richard


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lmorgan822(at)aol.com
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PostPosted: Fri Feb 03, 2006 8:43 pm    Post subject: Which Prop Reply with quote

Look for Vari-Prop at space 26, Sun'n'Fun. You will be pleasantly surprised!!!!!!!!!!!

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william(at)wrmills.plus.c
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PostPosted: Sat Feb 04, 2006 12:18 am    Post subject: Which Prop Reply with quote

Hi Peter,
If you are considering a Kremen / Woodcomp CS prop, they are currently
developing a new blade with more twist, designed to suit higher cruise
speeds like the Europa. It may be worthwhile to wait a few months for the
new product to be released.
Best wishes,
William

Do not archive

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ami(at)mcfadyean.freeserv
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PostPosted: Sat Feb 04, 2006 3:41 am    Post subject: Which Prop Reply with quote

The Aerosail prop at
http://www.aero-sail.com/aero-sail/offer.xml/propellers/air
claims to be aero-elastic.
Whether it is to the extent that it would give sufficient increase in
take-off revs for an 80hp Europa, I can't answer; In any case, blade shape
usually needs to be far more scimitar-like to have a useful amount of pitch
change on loading.
There is an example installed on an AT-3 in the UK (based at North Weald);
there's a fly-in there on 22 April (could be the last fly-in there ahead of
2000 houses).

This is what the owner reported after changing from a 2-blade fixed pitch:

"In any case, the figures for the AT-3 are quite impressive. The take-off
run reduced from over 200 metres to 145 metres, while the cruise speed
increases by up to 5 knots for the same RPM setting. Rate of climb is also
significantly better than with the 2-blade propeller".

PFA approvals for use of this prop are currently on 912 and 912S engines,
but none specifically on an Europa at the moment.
I've no further info. short of going to look at the prop; which is intended
on 22 April.

Duncan Mcf.

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lmorgan822(at)aol.com
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PostPosted: Sat Feb 04, 2006 12:28 pm    Post subject: Which Prop Reply with quote

Look for Vari-Prop at Sun'n'fun space 26. Blades custom made for your application, lightweight, CS, and tough enough for direct drive engines.

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