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rsrandazzo(at)precisionma
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 Posted: Fri Jul 27, 2007 8:32 am Post subject: SPAM-LOW: fore and aft loading vs. performance |
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Steve-
When racing our T-6, we shift the CG all the way to the rear limit. This adds a significant amount of speed vs. allowing the CG to remain where the designers put it.
That being the case- I’d expect to see the same on any airplane’s CG range….
We are currently “Weighing” the pro’s/con’s of the CG location on N414C when we finally get her on the scales. So much equipment came out of the empennage mounted racks that the CG has likely come forward some. This is a good thing for single engine control- but a bad thing for cruise speeds…. This airplane already had 70lbs of lead ballast weight bolted to the very tip of the tail….
Robert Randazzo
From: owner-commander-list-server(at)matronics.com [mailto:owner-commander-list-server(at)matronics.com] On Behalf Of Steve (at) Col-East
Sent: Friday, July 27, 2007 6:03 AM
To: commander-list(at)matronics.com
Subject: SPAM-LOW: fore and aft loading vs. performance
Gang,
I know in THEORY that an aft loading affects cruise and stall speeds, and the book answer as to why.
Has anyone messed around with loading configurations and seen a real world difference? How much?
Seing as how we're well to the front, and could go out of the envelope in certain configurations, I'm curious as to whether ballasting could actually pay off by increased efficiency.
Was it cmd Gordon that mentioned something about ballast a couple threads back? What's the history on that?
Steve
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steve2(at)sover.net
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| Posted: Fri Jul 27, 2007 10:20 am Post subject: SPAM-LOW: fore and aft loading vs. performance |
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This stuff is good information. When I did some calcs of loading scenarios I thought I had to be wrong..... We too have now removed most of the stuff from the 'radio room'.
I added a line to my spreadsheet for 'ballast' and I am surprised at how much the ship can usefully add out at the tailcone bulkhead location. (Where we would really put it, I'm not sure.... I'd want to look at what has been done in the past.)
We got to kick this around some, check my numbers, and decide what we want to do. But its good to know that I'm not making this up and there is a history of some of these aircraft using ballast.....
T-6's are up to what nowadays, 225mph or better? I've played a little with rudder trim, and I'm pretty sure tweaking that even after a centered ball can gain a couple knots.
Steve
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dowens(at)aerialviewpoint
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| Posted: Fri Jul 27, 2007 12:43 pm Post subject: SPAM-LOW: fore and aft loading vs. performance |
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We also have the lead ballast in the tail of the 500A...
David Owens
Aerial Viewpoint
N14AV
AC-500A-Colemill
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dowens(at)aerialviewpoint
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| Posted: Fri Jul 27, 2007 12:44 pm Post subject: SPAM-LOW: fore and aft loading vs. performance |
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What does SPAM LOW MEAN???
David Owens
Aerial Viewpoint
N14AV
AC-500A-Colemill
[quote][b]
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