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Engine ground runs

 
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dcheever(at)bak.rr.com
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PostPosted: Thu Jun 02, 2016 8:25 am    Post subject: Engine ground runs Reply with quote

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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PostPosted: Thu Jun 02, 2016 11:26 am    Post subject: Engine ground runs Reply with 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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flying-nut(at)cfl.rr.com
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PostPosted: Thu Jun 02, 2016 11:49 am    Post subject: Engine ground runs Reply with quote

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. Sad
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
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PostPosted: Thu Jun 02, 2016 12:58 pm    Post subject: Engine ground runs Reply with quote

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. Sad 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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