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quinn_tom(at)tqiinc.com
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 Posted: Sun Feb 13, 2011 4:26 am Post subject: What is that noise???? |
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I swapped my McCauley prop with a Sensenich prop during my last annual and I did notice a significant performance improvement. During cruise I noticed a loud almost shrieking noise in the cockpit over 2500 rpm. It was loud enough to trigger the mike on my headset! I returned the aircraft back to the mechanic complaining of the nose and they took a look to make sure everything was properly installed and tight, and it was. After spending a few minutes looking around the A&P half jokingly said “maybe you are going so fast that the wind is causing the noise?”, yeah right. Then I got to thinking about it. I took a look at the weather stripping around the canopy and it looked like original equipment (34 years old) meaning that all that was left was the tape that the foam used to be attached to. I removed all the old material and replaced the weather stripping. Now not only did the noise disappear but cold air no longer enters the cockpit during flight. I could tell the difference right away when closing the canopy because now it actually takes some pressure to latch the canopy closed. I am also going to look around and take a look at other items such as hoses, ducting, and other weather stripping to make sure that they are in good working order.
Tom Quinn
249RR
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teamgrumman(at)yahoo.com
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| Posted: Sun Feb 13, 2011 10:37 am Post subject: What is that noise???? |
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What pitch? Do you have any other mods? What do you true at?
On the Project X plane, flat out it will barely turn 2700 rpm at 5000 feet with a 63 in pitch prop. The engine is tired. It does TAS at 134 knots without wheel pants.
From: Tom Quinn <quinn_tom(at)tqiinc.com>
To: teamgrumman-list(at)matronics.com
Sent: Sun, February 13, 2011 4:14:38 AM
Subject: What is that noise????
I swapped my McCauley prop with a Sensenich prop during my last annual and I did notice a significant performance improvement. During cruise I noticed a loud almost shrieking noise in the cockpit over 2500 rpm. It was loud enough to trigger the mike on my headset! I returned the aircraft back to the mechanic complaining of the nose and they took a look to make sure everything was properly installed and tight, and it was. After spending a few minutes looking around the A&P half jokingly said “maybe you are going so fast that the wind is causing the noise?”, yeah right. Then I got to thinking about it. I took a look at the weather stripping around the canopy and it looked like original equipment (34 years old) meaning that all that was left was the tape that the foam used to be attached to. I removed all the old material and replaced the weather stripping. Now not only did the noise disappear but cold air no longer enters the cockpit during flight. I could tell the difference right away when closing the canopy because now it actually takes some pressure to latch the canopy closed. I am also going to look around and take a look at other items such as hoses, ducting, and other weather stripping to make sure that they are in good working order.
Tom Quinn
249RR
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[quote][b]
| | - The Matronics TeamGrumman-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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quinn_tom(at)tqiinc.com
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| Posted: Sun Feb 13, 2011 11:11 am Post subject: What is that noise???? |
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Gary,
No mods (except the new Sensenich prop), 62 pitch prop, and I haven’t done a scientific speed test yet but I can tell you it climbs a lot better.
Tom Quinn
249RR
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Sunday, February 13, 2011 1:34 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: What is that noise????
What pitch? Do you have any other mods? What do you true at?
On the Project X plane, flat out it will barely turn 2700 rpm at 5000 feet with a 63 in pitch prop. The engine is tired. It does TAS at 134 knots without wheel pants.
From: Tom Quinn <quinn_tom(at)tqiinc.com>
To: teamgrumman-list(at)matronics.com
Sent: Sun, February 13, 2011 4:14:38 AM
Subject: What is that noise????
I swapped my McCauley prop with a Sensenich prop during my last annual and I did notice a significant performance improvement. During cruise I noticed a loud almost shrieking noise in the cockpit over 2500 rpm. It was loud enough to trigger the mike on my headset! I returned the aircraft back to the mechanic complaining of the nose and they took a look to make sure everything was properly installed and tight, and it was. After spending a few minutes looking around the A&P half jokingly said “maybe you are going so fast that the wind is causing the noise?”, yeah right. Then I got to thinking about it. I took a look at the weather stripping around the canopy and it looked like original equipment (34 years old) meaning that all that was left was the tape that the foam used to be attached to. I removed all the old material and replaced the weather stripping. Now not only did the noise disappear but cold air no longer enters the cockpit during flight. I could tell the difference right away when closing the canopy because now it actually takes some pressure to latch the canopy closed. I am also going to look around and take a look at other items such as hoses, ducting, and other weather stripping to make sure that they are in good working order.
Tom Quinn
249RR
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