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Aerocomposites propellers

 
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glcasey



Joined: 01 Jul 2007
Posts: 23
PostPosted: Sun Jul 01, 2007 5:49 pm    Post subject: Aerocomposites propellers Reply with quote
I have a parallel-valve IO540 with a 3-blade Aerocomposites prop (sorry, not on a Rocket, but I understand this is a common engine-prop combination). During the last runup the rpm came down when cycling the prop, but didn't go back up. After I parked it I noticed that the prop tips have a pitch of about 29 degrees, which seems to be more than previously. I'm thinking something is wrong with the prop. Anyone know the degree of pitch at the tips when in flat pitch position? I recall that it was practically zero, but I didn't measure it. Any suggestions? I am using the Czech governor and it has performed perfectly - so far, at least. Thanks for any information from this Lancair ES flyer.

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Gary Casey
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PostPosted: Sun Jul 01, 2007 6:11 pm    Post subject: Aerocomposites propellers Reply with quote
Check the Govenor...........the prop only does what the Gov tells it to
do....
Weav

glcasey wrote:
Quote:


I have a parallel-valve IO540 with a 3-blade Aerocomposites prop (sorry, not on a Rocket, but I understand this is a common engine-prop combination). During the last runup the rpm came down when cycling the prop, but didn't go back up. After I parked it I noticed that the prop tips have a pitch of about 29 degrees, which seems to be more than previously. I'm thinking something is wrong with the prop. Anyone know the degree of pitch at the tips when in flat pitch position? I recall that it was practically zero, but I didn't measure it. Any suggestions? I am using the Czech governor and it has performed perfectly - so far, at least. Thanks for any information from this Lancair ES flyer.

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Gary Casey


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LesDrag(at)aol.com
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PostPosted: Mon Jul 02, 2007 7:35 am    Post subject: Aerocomposites propellers Reply with quote
Hi Gary,

For a standard CS propeller, the blade should have about a 10 to 14 degree pitch at about 9 inches from the tip.

There should be no oil pressure to the propeller with the engine stopped.
The standard propeller goes to low pitch without oil pressure.
The counterweighted blade propeller goes to high pitch without oil pressure.

A standard propeller shouldn't "stick" in high pitch unless something bad happened inside the propeller hub.

Regards,
Jim Ayers

In a message dated 07/01/2007 6:52:18 P.M. Pacific Daylight Time, glcasey(at)adelphia.net writes:
Quote:
--> Rocket-List message posted by: "glcasey" <glcasey(at)adelphia.net>

I have a parallel-valve IO540 with a 3-blade Aerocomposites prop (sorry, not on a Rocket, but I understand this is a common engine-prop combination).  During the last runup the rpm came down when cycling the prop, but didn't go back up. After I parked it I noticed that the prop tips have a pitch of about 29 degrees, which seems to be more than previously. I'm thinking something is wrong with the prop. Anyone know the degree of pitch at the tips when in flat pitch position? I recall that it was practically zero, but I didn't measure it. Any suggestions? I am using the Czech governor and it has performed perfectly - so far, at least. Thanks for any information from this Lancair ES flyer.

--------
Gary Casey




See what's free at AOL.com.
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