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thomphy(at)msn.com
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 Posted: Wed Sep 27, 2006 7:16 am Post subject: RV-List Digest: 48 Msgs - 09/26/06 |
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Hey Tim,
First, Congrat's on getting the airworthy cert!
Now, for the prop. Do you know for sure that you have a hollow crankshaft?
One of our local chapter members, had the same problem. Signed off, ready to
fly, can't cycle the prop!!!! Did every check known to man, only to find out
the engine guys put the wrong crankshaft in his engine!!! R&R engine,
replaced crankshaft, and the prop now cycles just fine.
Hope that's not your case. But you have to pull the prop to make sure.
Thomas Phy
RV-7 rotary
| Quote: | Hello Listers,
My -6 just got its airworthy cert today. I took it out and fueled it plus
taxi tested it. I did a run-up and found very little change when I cycle
the prop. How do I begin to determine the problem with this?
Thanks for any input
Tim
RV-6
N616TB
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Hopperdhh(at)aol.com
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| Posted: Wed Sep 27, 2006 7:47 am Post subject: RV-List Digest: 48 Msgs - 09/26/06 |
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Tim,
I am not an expert, but here's how I'd approach the problem. First I would give it plenty of time. The first cycle takes maybe 15 seconds to fill the prop. Go to at least 1800 RPM to be sure you're within the range of the prop/governor. Go to 2000 if that doesn't work. If that doesn't cause the prop to cycle, then I would put a pressure gauge in the prop line. My governor adaptor has a plug where this could be done. I would use 1/8 inch copper tubing to a 500 psi gauge into the cockpit. I don't know what the pressure should be exactly, maybe 150 psi or so. Perhaps someone else on the list knows. Or, a call to Hartzell would probably get you an answer. If you have pressure and the prop doesn't increase pitch and slow the engine RPM, then maybe Thomas is right -- the crank is wrong, or not set up for constant speed. Does it have a soft plug installed for a fixed pitch? Do you remember what the crankshaft looked like before you installed the prop?
Best wishes, and let us know what you find out.
Dan Hopper
RV-7A
In a message dated 9/27/2006 11:18:57 A.M. Eastern Daylight Time, thomphy(at)msn.com writes:
| Quote: | --> RV-List message posted by: "Thomas Phy" <thomphy(at)msn.com>
Hey Tim,
First, Congrat's on getting the airworthy cert!
Now, for the prop. Do you know for sure that you have a hollow crankshaft?
One of our local chapter members, had the same problem. Signed off, ready to
fly, can't cycle the prop!!!! Did every check known to man, only to find out
the engine guys put the wrong crankshaft in his engine!!! R&R engine,
replaced crankshaft, and the prop now cycles just fine.
Hope that's not your case. But you have to pull the prop to make sure.
Thomas Phy
RV-7 rotary
| Quote: | Hello Listers,
My -6 just got its airworthy cert today. I took it out and fueled it plus
taxi tested it. I did a run-up and found very little change when I cycle
the prop. How do I begin to determine the problem with this?
Thanks for any input
Tim
RV-6
es Day --> - NEW MATRONICS WEB FORUMS -
bsp; --> nbsp; - NEW MATRONICS LIST WIKI -
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_-= ; p; - List Contribution Web Site ; =========================
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[quote][b]
| | - 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:
http://www.matronics.com/Navigator?RV-List |
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n616tb(at)btsapps.com
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| Posted: Wed Sep 27, 2006 10:31 am Post subject: RV-List Digest: 48 Msgs - 09/26/06 |
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Thanks all for the input on this prop issue. I will be checking it out further when I get back in town on Saturday. This morning I went to do this, but had a dead battery. Building took it’s toll on it so now I get to have a new one.
I am a tail wheel guy so I will not allow the plane to go over on its nose. I can tie it down if need be. As I remember, the crank had a red plastic plug stuck in it when it arrived from Aero Sport. I removed it and installed the prop. I am pretty sure I would have noticed if they had a hard plug in there, but if I can’t get it to go then I will remove the prop to double check. I did hear it after a couple of times cycle start to drop the RPM, but it wasn’t as much as I was expecting. It must be getting at least some oil.
Anyway, I will update the list Saturday afternoon when I get a chance to check it with a good battery.
Thanks again
Tim
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Hopperdhh(at)aol.com
Sent: Wednesday, September 27, 2006 8:46 AM
To: rv-list(at)matronics.com
Subject: Re: Re: RV-List Digest: 48 Msgs - 09/26/06
Tim,
I am not an expert, but here's how I'd approach the problem. First I would give it plenty of time. The first cycle takes maybe 15 seconds to fill the prop. Go to at least 1800 RPM to be sure you're within the range of the prop/governor. Go to 2000 if that doesn't work. If that doesn't cause the prop to cycle, then I would put a pressure gauge in the prop line. My governor adaptor has a plug where this could be done. I would use 1/8 inch copper tubing to a 500 psi gauge into the cockpit. I don't know what the pressure should be exactly, maybe 150 psi or so. Perhaps someone else on the list knows. Or, a call to Hartzell would probably get you an answer. If you have pressure and the prop doesn't increase pitch and slow the engine RPM, then maybe Thomas is right -- the crank is wrong, or not set up for constant speed. Does it have a soft plug installed for a fixed pitch? Do you remember what the crankshaft looked like before you installed the prop?
Best wishes, and let us know what you find out.
Dan Hopper
RV-7A
In a message dated 9/27/2006 11:18:57 A.M. Eastern Daylight Time, thomphy(at)msn.com writes:
| Quote: |
--> RV-List message posted by: "Thomas Phy" <thomphy(at)msn.com>
Hey Tim,
First, Congrat's on getting the airworthy cert!
Now, for the prop. Do you know for sure that you have a hollow crankshaft?
One of our local chapter members, had the same problem. Signed off, ready to
fly, can't cycle the prop!!!! Did every check known to man, only to find out
the engine guys put the wrong crankshaft in his engine!!! R&R engine,
replaced crankshaft, and the prop now cycles just fine.
Hope that's not your case. But you have to pull the prop to make sure.
Thomas Phy
RV-7 rotary
> Hello Listers,
>
> My -6 just got its airworthy cert today. I took it out and fueled it plus
> taxi tested it. I did a run-up and found very little change when I cycle
> the prop. How do I begin to determine the problem with this?
>
> Thanks for any input
> Tim
> RV-6
> es Day --> - NEW MATRONICS WEB FORUMS -
bsp; --> nbsp; - NEW MATRONICS LIST WIKI -
Web Site ;
|
01234567890123
[quote][b]
| | - 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:
http://www.matronics.com/Navigator?RV-List |
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