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Engine ground runs

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dcheever(at)bak.rr.com
Guest

Posted: Thu Jun 02, 2016 8:25 am Post subject: Engine ground runs

Hi all,

 

I posted over on GG about dynamic propeller balancing and got overwhelming positive comments, particularly from Jim Shafer at Power Flow.  Obviously all of us with Jaguar cowlings do have the Power Flow exhaust.  There is a YouTube video of a Tiger getting balanced and I noticed that with the original cowling  they are running it with the top removed but the bottom still in place.  My question to other Jaguar cowl owners (and more specifically to Gary) is, would it be safe to do this with the Jag cowl?   I would think completely removing it prior to an engine run would be better, but thought I would ask.

 

 

Dennis Cheever

N3752W (at) L45

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teamgrumman(at)yahoo.com
Guest

Posted: Thu Jun 02, 2016 11:26 am Post subject: Engine ground runs

You can’t get any engine cooling with the cowling off.

I really don’t know why the cowling needs to come off.  Unless it’s for an accelerometer.  I had a prop balance and they didn’t take the cowling off.



Keep in mind that any post balancing nicks, or filing of the nicks in your prop, negates the prop balance.



Gary



 	  Quote: 	
		  On Jun 2, 2016, at 9:13 AM, Dennis Cheever <dcheever(at)bak.rr.com (dcheever(at)bak.rr.com)> wrote:

Hi all,

 

I posted over on GG about dynamic propeller balancing and got overwhelming positive comments, particularly from Jim Shafer at Power Flow.  Obviously all of us with Jaguar cowlings do have the Power Flow exhaust.  There is a YouTube video of a Tiger getting balanced and I noticed that with the original cowling  they are running it with the top removed but the bottom still in place.  My question to other Jaguar cowl owners (and more specifically to Gary) is, would it be safe to do this with the Jag cowl?   I would think completely removing it prior to an engine run would be better, but thought I would ask.

 

 

Dennis Cheever

N3752W (at) L45

- 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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flying-nut(at)cfl.rr.com
Guest

Posted: Thu Jun 02, 2016 11:49 am Post subject: Engine ground runs

Actually, the final run(s) should be       done with the airplane ready for flight.  I've taken the test set       on a flight when we couldn't get static RPM close to cruise RPM.        I've always attached the accelerometer to the engine.  The       accelerometer is sensitive enough that it will pick up motion of       the airframe from winds making the final run(s) tough to nail       down.

       I don't agree that filing knicks negates the balance ..... but it       will change it a little ...... and not enough to tell on a       re-balance.  Any nick/filing large enough to negate the balance       job would probably render the prop unairworthy .... unless at the       very tip.

       No, I don't do dynamic balances any more. 

       Linn

       

       On 6/2/2016 3:26 PM, Gary L Vogt wrote:

     

      	  Quote: 	
		                You can’t get any engine cooling with the cowling off.              

       I really don’t know why the cowling needs to come         off.  Unless it’s for an accelerometer.  I had a prop balance         and they didn’t take the cowling off.

              

       Keep in mind that any post balancing nicks, or         filing of the nicks in your prop, negates the prop balance.

              

       Gary

              

                            	  Quote: 	
		               On Jun 2, 2016, at 9:13 AM, Dennis Cheever               <dcheever(at)bak.rr.com (dcheever(at)bak.rr.com)>               wrote:

                                                          Hi all,

                  

                 I posted                   over on GG about dynamic propeller balancing and got                   overwhelming positive comments, particularly from Jim                   Shafer at Power Flow.  Obviously all of us with Jaguar                   cowlings do have the Power Flow exhaust.  There is a                   YouTube video of a Tiger getting balanced and I                   noticed that with the original cowling  they are                   running it with the top removed but the bottom still                   in place.  My question to other Jaguar cowl owners                   (and more specifically to Gary) is, would it be safe                   to do this with the Jag cowl?   I would think                   completely removing it prior to an engine run would be                   better, but thought I would ask.

                  

                  

                 Dennis                   Cheever

                 N3752W (at)                   L45

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teamgrumman(at)yahoo.com
Guest

Posted: Thu Jun 02, 2016 12:58 pm Post subject: Engine ground runs

I stopped doing prop balancing 20 years ago. 	  Quote: 	
		  On Jun 2, 2016, at 12:48 PM, Linn Walters <flying-nut(at)cfl.rr.com (flying-nut(at)cfl.rr.com)> wrote:

                   Actually, the final run(s) should be       done with the airplane ready for flight.  I've taken the test set       on a flight when we couldn't get static RPM close to cruise RPM.        I've always attached the accelerometer to the engine.  The       accelerometer is sensitive enough that it will pick up motion of       the airframe from winds making the final run(s) tough to nail       down.       I don't agree that filing knicks negates the balance ..... but it       will change it a little ...... and not enough to tell on a       re-balance.  Any nick/filing large enough to negate the balance       job would probably render the prop unairworthy .... unless at the       very tip.       No, I don't do dynamic balances any more.        Linn              On 6/2/2016 3:26 PM, Gary L Vogt wrote:     

      	  Quote: 	
		                You can’t get any engine cooling with the cowling off.              

       I really don’t know why the cowling needs to come         off.  Unless it’s for an accelerometer.  I had a prop balance         and they didn’t take the cowling off.

              

       Keep in mind that any post balancing nicks, or         filing of the nicks in your prop, negates the prop balance.

              

       Gary

              

                            	  Quote: 	
		               On Jun 2, 2016, at 9:13 AM, Dennis Cheever               <dcheever(at)bak.rr.com (dcheever(at)bak.rr.com)>               wrote:

                                                          Hi all,

                  

                 I posted                   over on GG about dynamic propeller balancing and got                   overwhelming positive comments, particularly from Jim                   Shafer at Power Flow.  Obviously all of us with Jaguar                   cowlings do have the Power Flow exhaust.  There is a                   YouTube video of a Tiger getting balanced and I                   noticed that with the original cowling  they are                   running it with the top removed but the bottom still                   in place.  My question to other Jaguar cowl owners                   (and more specifically to Gary) is, would it be safe                   to do this with the Jag cowl?   I would think                   completely removing it prior to an engine run would be                   better, but thought I would ask.

                  

                  

                 Dennis                   Cheever

                 N3752W (at)                   L45

- 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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