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Airmaster prop adjustment

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air.guerner(at)wanadoo.fr
Guest

Posted: Sat Jun 03, 2006 11:51 am Post subject: Airmaster prop adjustment

Hello all,

I recently installed an Airmaster prop.  I have increased the coarse pitch limit twice. Coarse blade angle is now 24 degrees 15 minutes measured at the tip and needs to be increased again. I would like to know what coarse limit the others with Monowheel/912S are flying with.

Remi Guerner

F-PGKL, XS S/N395 monowheel,  912S,  Airmaster, 391 hours

daseitz(at)cfl.rr.com
Guest

Posted: Sun Jun 04, 2006 12:05 pm Post subject: Airmaster prop adjustment

I have adjusted mine once to get more coarse. Not sure what the coarse pitch

is right now but I had noticed flying straight and level that about 32 inchs

manifold pressure got the prop to full coarse limit. I haven't seen it go to

full coarse since but have not been pushing it real hard since at 5000 ft I

have to run at less than 50% power to stay with them. At 5000 ft I've been

seeing 145 kts at 65% or less.



Dean Seitz

N284A Europa XS tri gear 914 Airmaster

91 hrs so far



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paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Sun Jun 04, 2006 2:03 pm Post subject: Airmaster prop adjustment

 	  Quote: 	
		   At 5000 ft I've been seeing 145 kts at 65% or less.


	


 	  Quote: 	
		   Dean Seitz

 N284A Europa XS tri gear 914 Airmaster

 91 hrs so far


	


Hi Dean,



Can you tell me the MP (at) RPM setting that you see that correlates to 65% ?

Is the 5000' value you have derived after compensating for barometric

pressure and temperature ?



How are you verifying your speed, 3 or 4 axis runs, or some other method.



Thanks,  Paul

daseitz(at)cfl.rr.com
Guest

Posted: Sun Jun 04, 2006 2:24 pm Post subject: Airmaster prop adjustment

I'm going by the rotax chart that shows 75% power is 31" MP and 5000rpm and

if I'm not mistaken 65% is 30" mp. I don't have the book with me right now.

The 5000' is right off the altimeter set at the closest airport altimeter

setting. Yesyerday we were at 6500' showing around 135 knots, to fly with a

Piper Archer and the MP was back to approximately 28" at 5000rpm.

Dean Seitz



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daseitz(at)cfl.rr.com
Guest

Posted: Sun Jun 04, 2006 2:25 pm Post subject: Airmaster prop adjustment

I checked the speed a couple times with the  three runs at more than 90 deg.

apart spreadsheet. Also was comparing groundspeed and airspeed with the

Archer we were flying with.



Dean



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garrys(at)tampabay.rr.com
Guest

Posted: Sun Jun 04, 2006 2:59 pm Post subject: Airmaster prop adjustment

Dean,



At 30" MP and 5000 RPM a Europa is roughly a 125 Kt airplane at sea level. 

To what do you attribute your amazing performance?



Garry Stout

914 Tri w/whirlwind prop & 450 hours.



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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Jun 04, 2006 3:22 pm Post subject: Airmaster prop adjustment

Dean Seitz a écrit :

 	  Quote: 	
		    At 5000 ft I've been

 seeing 145 kts at 65% or less.

   


	


Hi Dean,



Those numbers are most impressive.

If they are confirmed, then you're doing better than most Europas, and 

even faster than the smaller and lighter MCR 01 with its diminutive 

laminar flow wing.

Honest, I would have expected this power setting would yield the same 

numbers, but in mph. 145 mph is about 126 kt, quite in accordance with 

what I heard about the Europa.



I'd be interested in learning more about your speed measurements, and 

the mods you performed on the aircraft : any cooling drag reduction, 

hiding antennas, work on the wing, etc.



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

SPurpura(at)aol.com
Guest

Posted: Sun Jun 04, 2006 3:22 pm Post subject: Airmaster prop adjustment

Wow 145KTS (at) 65% is incredible for even IAS at that power setting,are you sure about that,my 914 mono would be about 110KTS IAS at 65% power

daseitz(at)cfl.rr.com
Guest

Posted: Sun Jun 04, 2006 3:23 pm Post subject: Airmaster prop adjustment

Yes, at sea level mine is doing 130 kts at 31" mp. At higher alt is is

performing really nice. I haven't been flying too much at high alt but the

last few weeks been flying with other planes at 5000 to 7500 ft and notice a

big difference in speed.



Dean



--

paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Sun Jun 04, 2006 4:52 pm Post subject: Airmaster prop adjustment

Hi all,



The only charts I have found for the 914 are a real "magnifying glass job"

and I have a heck of a time trying to do the interpolations



I'd be interested in what folks think 28" (at) 5000 RPM is in % of power.  I

have always though it was 65%, but I am not really sure.



Paul



do not archive



--

daseitz(at)cfl.rr.com
Guest

Posted: Mon Jun 05, 2006 12:43 pm Post subject: Airmaster prop adjustment

Here are the numbers out of the rotax operators manual:



Takeoff power     5800rpm      39"mp

Max cont power    5500rpm      35"mp

75% power         5000rpm      31"mp

65% power         4800rpm      29"mp

55% power         4300rpm      28"mp

I did once see another chart in the book that differed a little on the rpm's

but can't find it now.



Ever since I installed the wheel and leg fairings its flown a constant

130kts at sea level to around 2000'.  If weather permits I'll go up around

7500' this weekend and see what the different power setting give in speed.

Although I always fly at cruise on the prop which is 5000rpm.  



I do not have the europa speed kit. My main gear wheels are from aircraft

spruce and I made the nose wheel and all the leg fairings.

Dean Seitz

N284A





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paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Mon Jun 05, 2006 4:26 pm Post subject: Airmaster prop adjustment

Dean,



That helps, sort of.  I have a constant speed prop, and during cruise I run

at 5000 rpm, however from the charts I have I find it difficult to

interpolate what % power settings MP's from 24" through to 34" would

actually translate to.



I suspect that you are looking at a larger chart than the small one in the

engine logbook.  If so, are you able to tell me the following:



34" (at) 5000 rpm = xx%

33" (at) 5000 rpm = yy%

32" (at) 5000 rpm = ww%

.

.

24" (at) 5000 rpm = zz%



Thanks,  Paul



do not archive.





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