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Sensenich Prop

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dean.psiropoulos(at)veriz
Guest

Posted: Sun Feb 21, 2010 8:10 pm Post subject: Sensenich Prop

Sensenich Metal Prop users:



I have a 72FM85 (72 length x 85 pitch) metal prop for parallel valve 0-360.

I installed the prop a while back to solve what turned out to be a problem

with the FI system.  When the prop didn't fix the problem I did more testing

and static running with it to finally figure it out.  I discovered that at

full throttle (ground run) the tach showed only 2100 RPM.  I didn't get a

chance to fly with that prop because it was recalled before the FI system

was fixed and I had to take it off the airplane. I've been flying with my

Sterba wood prop which gives 2300 RPM static and 2550 RPM full power at 1000

MSL (level flight).  



I want to reinstall the Sensenich prop but am thinking that 2100 max RPM at

takeoff is a little low. Van's catalog listed this prop as the ONLY one they

recommended for the 0-360 engine.  The Sensenich website lists two other

(0-360) props (83 and 81 pitch) and if my Sterba is any indication, I

probably should have at least went with the 83 pitch instead of the 85.  



I know there are a lot of these props out in the RV community...those of you

that have them on 180HP O-360s:



Are you getting this low of RPM on takeoff (2100 static)?



What kind of takeoff distances are you seeing (light and fully loaded)?



Does the RPM pick up quickly as the plane starts moving on the runway?



By the time your at the end of the takeoff roll does the RPM exceed 2100?



Will there be any harm done to the engine running full throttle at 600RPM

below rated power RPM (detonation, overheating, etc, low power is a given)? 



How many of you with the 85 inch pitch props have gotten them re-pitched?



Would you have gone with 83 or 81 inch pitch if you'd known ahead of time?



Is anyone using the 83 or 81 pitch version and what is your experience with

those?



Thanks.



Dean Psiropoulos

RV-6A N197DM

Finally warming...S. Florida

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dale1rv6(at)comcast.net
Guest

Posted: Mon Feb 22, 2010 3:56 am Post subject: Sensenich Prop

I had same prop at 83" pitch. Static rpm 2200. Got about 2350 rpm at

rotation. Climb at least 1200 fpm warm day South Florida. Max level flight

rpm was 2950. Repitched to 86". Static rpm was 2100. 2250 at rotation. Climb

was only slightly reduced. Full power level rpm was 2750 up to 8000ft. My

cruise climb was 2500 rpm, 500 fpm at 140 knots indicated up to about 4000

feet in standard to 20 degrees warmer than standard. Take offs from Sedona

AZ in August heat were strong, elev 4800. If I had an 85" personally I would

not change it, unless you will be using gross weights above normal 1650 lbs.

Was a great prop, quieter than my new Hartzell, which I like even better.



Dale

RV6A, O-360 A1A, 1280 TT




<dean.psiropoulos(at)verizon.net>



Sensenich Metal Prop users:

How many of you with the 85 inch pitch props have gotten them re-pitched?



Would you have gone with 83 or 81 inch pitch if you'd known ahead of time?



Is anyone using the 83 or 81 pitch version and what is your experience with

those?



Thanks.



Dean Psiropoulos

RV-6A N197DM

Finally warming...S. Florida

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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brad.reak(at)verigy.com
Guest

Posted: Mon Feb 22, 2010 10:28 am Post subject: Sensenich Prop

I have an RV7 with a Superior O360,180hp with the same Sensenich prop.  My static RPM reads 2150 at my field elevation of 5000ft.  During takeoff, the RPM quickly comes up to about 2400 RPM and in climbout, I see about 2450-2500 RPM.  At level flight from 6000ft to the high teens the engine easily exceed 2700 RPM.  If I were to repitch the prop, it would be to a greater pitch, not less and would never go the 83 or 81.  Sorry but I don’t have much operational experience at sea level, however I would expect better performance than what I see here in Colorado and I am quite pleased with my performance.  During testing, I concluded Vy = 90 knots and that I expect about 1500 fpm at 1600 pounds.  

   

--Brad  

      [quote][b]

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at6c(at)bellsouth.net
Guest

Posted: Mon Feb 22, 2010 2:11 pm Post subject: Sensenich Prop

Hi Dean,

I have this prop on an RV-8 with a Mattituck O-360, and my experience is

that I need more pitch.  I can easily get to red line in level flight, say

8000 ft.  Our grass field has been under water since before Christmas so I

can't really say what static take off rpm is but as a guess I would guess

around 2200.  I would have it re-pitched but I am too lazy.



I looked on the Sensenich web site and didn't see anything about a recall,

what was that about?



Regards,

George



--

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joelhaynes

Joined: 11 Jan 2006
Posts: 19
Location: Bozeman, MT

Posted: Wed Feb 24, 2010 5:39 pm Post subject: Sensenich Prop

Dean,

   I spoke with Tom at Van's before selecting the 85" pitch prop. He said I would be unhappy with cruise speeds with any pitch lower than 85.  He was right.  At 8000 ft and full throttle I am right at redline at 2700 rpm and close to 175 kt TAS.  I don't want to have any throttle left when I hit redline.  85" pitch works perfectly for RVs with the 0-360.  I fly off a 5000 ft altitude strip and I am easily in the air in a few hundred feet.  Grossed out on a high density altitude day she will still climb much better than what would be prudent for proper cylinder cooling.  Normal climb out for me is at 2450-2500 rpm, 135-140 kts TAS and about 750 fpm, which keeps the engine cool, and that is throttled back significantly.  Performance is not a problem.  The 2100 rpm static is about what I get.  When the plane gets moving the rpms rise nicely.

    

   Joel Haynes

   RV-7A

   N557XW

   Bozeman, MT

   250 hrs - Gettin' paint soon

 

      	  Quote: 	
		  



=Time: 08:10:37 PM PST US

=From: "DEAN PSIROPOULOS" <=Subject">dean.psiropoulos(at)verizon.net>

=Subject: Sensenich Prop=



=Sensenich Metal Prop users:



=I have a 72FM85 (72 length x 85 pitch) metal prop for parallel valve 0-360.

=I installed the prop a while back to solve what turned out to be a problem

=with the FI system.  When the prop didn't fix the problem I did more testing

=and static running with it to finally figure it out.  I discovered that at

=full throttle (ground run) the tach showed only 2100 RPM.  I didn't get a

=chance to fly with that prop because it was recalled before the FI system

=was fixed and I had to take it off the airplane. I've been flying with my

=Sterba wood prop which gives 2300 RPM static and 2550 RPM full power at 1000

=MSL (level flight).  



=I want to reinstall the Sensenich prop but am thinking that 2100 max RPM at

=takeoff is a little low. Van's catalog listed this prop as the ONLY one they

=recommended for the 0-360 engine.  The Sensenich website lists two other

=(0-360) props (83 and 81 pitch) and if my Sterba is any indication, I

=probably should have at least went with the 83 pitch instead of the 85.  



=I know there are a lot of these props out in the RV community...those of you

=that have them on 180HP O-360s:



=Are you getting this low of RPM on takeoff (2100 static)?



=What kind of takeoff distances are you seeing (light and fully loaded)?



=Does the RPM pick up quickly as the plane starts moving on the runway?



=By the time your at the end of the takeoff roll does the RPM exceed 2100?



=Will there be any harm done to the engine running full throttle at 600RPM

=below rated power RPM (detonation, overheating, etc, low power is a given)? 



=How many of you with the 85 inch pitch props have gotten them re-pitched?



=Would you have gone with 83 or 81 inch pitch if you'd known ahead of time?



=Is anyone using the 83 or 81 pitch version and what is your experience with

=those?



=Thanks.



Dean Psiropoulos

RV-6A N197DM

Finally warming...S. Florida

	


 

   [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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