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Flying 52 without cowling

 
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Bill1200



Joined: 19 Oct 2008
Posts: 111
Location: medford oregon
PostPosted: Sat Apr 11, 2015 2:54 pm    Post subject: Flying 52 without cowling Reply with quote
Just put on new engine, some adjustments left. Want to test fly it in the pattern without cowling, to facilitate work on the ground. Anyone have experience with this in regards to cylinder temps

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wlannon(at)shaw.ca
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PostPosted: Sat Apr 11, 2015 3:28 pm    Post subject: Flying 52 without cowling Reply with quote
Don't do that!

Any ground running of the engine without the cowling must be limited to idle
or very low power for a short period of time. Flight without the cowl may
well be suicidal.

The reason for this is simply that the cylinders cannot properly cool. Air
cooling depends on the cowl and cylinder baffle combination to force cooling
air under pressure to flow in close contact with the cylinder fins.
That worked for rotary engines and some early radials but without any
cylinder baffling.

Walt

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migfighter42(at)gmail.com
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PostPosted: Sat Apr 11, 2015 3:51 pm    Post subject: Flying 52 without cowling Reply with quote
Agreed, don't do it. Without the cowl, airflow is not properly contained/coltrolled. Aerodynamics are also different. I tried it once, made half a lap and was redline. 

Don't do it.


Bill Culberson
Red Star Aero Services

<div>-------- Original message --------</div><div>From: Bill1200 <billdykes52(at)hotmail.com> </div><div>Date:04/11/2015 5:54 PM (GMT-06:00) </div><div>To: yak-list(at)matronics.com </div><div>Cc: </div><div>Subject: Yak-List: Flying 52 without cowling </div><div>
</div>

Just put on new engine, some adjustments left. Want to test fly it in the pattern without cowling, to facilitate work on the ground. Anyone have experience with this in regards to cylinder temps




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http://forums.matronics.com/viewtopic.php?p=440676#440676

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Bill1200



Joined: 19 Oct 2008
Posts: 111
Location: medford oregon
PostPosted: Sat Apr 11, 2015 4:53 pm    Post subject: Re: Flying 52 without cowling Reply with quote
ok, thanks

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Viperdoc



Joined: 19 Apr 2014
Posts: 484
Location: 08A
PostPosted: Sat Apr 11, 2015 6:51 pm    Post subject: Flying 52 without cowling Reply with quote
Danged! Why take that risk?! It's such a simple cowling to put and take off.
Don't do it. Your CHT's are going to be all over the place! Run it without the cowling then check it with the LASE temp gun. You will be totally confused by the numbers you see. Walt and Bill are correct.
Doc

Sent from my iPad

On Apr 11, 2015, at 6:50 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:
[quote]Agreed, don't do it. Without the cowl, airflow is not properly contained/coltrolled. Aerodynamics are also different. I tried it once, made half a lap and was redline.
Don't do it.


Bill Culberson
Red Star Aero Services
-------- Original message --------
From: Bill1200 <billdykes52(at)hotmail.com (billdykes52(at)hotmail.com)>
Date:04/11/2015 5:54 PM (GMT-06:00)
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Cc:
Subject: Flying 52 without cowling
--> Yak-List message posted by: "Bill1200" <billdykes52(at)hotmail.com (billdykes52(at)hotmail.com)>

Just put on new engine, some adjustments left. Want to test fly it in the pattern without cowling, to facilitate work on the ground. Anyone have experience with this in regards to cylinder temps


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=440676#440676

========================== --> ============================================================================== -===========================================================

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Viperdoc
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jackpot



Joined: 13 Jul 2010
Posts: 65
Location: Las Vegas, Nevada
PostPosted: Sun Apr 12, 2015 9:55 am    Post subject: Flying 52 without cowling Reply with quote
Don't fly it with cowl off. You will be causing all of our War Bird insurance rates to increase ????
Gary G.

Sent from my iPhone

On Apr 11, 2015, at 19:50, Roger Kemp <f16viperdoc(at)me.com (f16viperdoc(at)me.com)> wrote:
[quote]Danged! Why take that risk?! It's such a simple cowling to put and take off.
Don't do it. Your CHT's are going to be all over the place! Run it without the cowling then check it with the LASE temp gun. You will be totally confused by the numbers you see. Walt and Bill are correct.
Doc

Sent from my iPad

On Apr 11, 2015, at 6:50 PM, migfighter42 <migfighter42(at)gmail.com (migfighter42(at)gmail.com)> wrote:
Quote:
Agreed, don't do it. Without the cowl, airflow is not properly contained/coltrolled. Aerodynamics are also different. I tried it once, made half a lap and was redline.
Don't do it.


Bill Culberson
Red Star Aero Services
-------- Original message --------
From: Bill1200 <billdykes52(at)hotmail.com (billdykes52(at)hotmail.com)>
Date:04/11/2015 5:54 PM (GMT-06:00)
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Cc:
Subject: Flying 52 without cowling
--> Yak-List message posted by: "Bill1200" <billdykes52(at)hotmail.com (billdykes52(at)hotmail.com)>

Just put on new engine, some adjustments left. Want to test fly it in the pattern without cowling, to facilitate work on the ground. Anyone have experience with this in regards to cylinder temps


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=440676#440676

========================== --> ============================================================================== -===========================================================

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