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Which Prop

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peter.rees01(at)tiscali.c
Guest

Posted: Fri Feb 03, 2006 12:37 pm Post subject: Which Prop

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 

(



Peter

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terrys(at)cisco.com
Guest

Posted: Fri Feb 03, 2006 3:15 pm Post subject: Which Prop

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
Guest

Posted: Fri Feb 03, 2006 3:29 pm Post subject: Which Prop

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
Guest

Posted: Fri Feb 03, 2006 3:48 pm Post subject: Which Prop

 	  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 (


	




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
Guest

Posted: Fri Feb 03, 2006 8:43 pm Post subject: Which Prop

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

 

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william(at)wrmills.plus.c
Guest

Posted: Sat Feb 04, 2006 12:18 am Post subject: Which Prop

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
Guest

Posted: Sat Feb 04, 2006 3:41 am Post subject: Which Prop

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
Guest

Posted: Sat Feb 04, 2006 12:28 pm Post subject: Which Prop

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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