Vampire Trim Tabs
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Join Date: May 1999
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Vampire Trim Tabs
Hello, Today I was looking at two Vampires that had dropped into Christchurch on their way north and while they were being refuelled I was looking at the Elevator and noticed that the Trim tab on the elevator was offset quite a bit to the left and was wondering if anyone on this forum knows why this would be as I could not think of a reason why.
Regards Barry
Regards Barry
Here's a wild guess, anyhow.
If it was in the middle, it would get the turbulent airflow off the fuselage pod, particularly at high AOA.
Being out to one side would give it cleaner flow and therefore better effectiveness and consistency of operation. (??)
See, if I don't know, I can make it up with the best of them!
If it was in the middle, it would get the turbulent airflow off the fuselage pod, particularly at high AOA.
Being out to one side would give it cleaner flow and therefore better effectiveness and consistency of operation. (??)
See, if I don't know, I can make it up with the best of them!
Join Date: Dec 2000
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Originally Posted by Arm out the window
See, if I don't know, I can make it up with the best of them!
Last edited by Ultralights; 17th Apr 2006 at 09:23.
Same idea with a full-span elevator, move it to the side to avoid dirty airflow from the fuselage.
With split elevators (ie one each side of the fuselage), cheaper and easier to set up just one tab, and the slight rolling moment caused by trim changes not enough to worry about. Sound fair?
I like Sunfish's concept though.
With split elevators (ie one each side of the fuselage), cheaper and easier to set up just one tab, and the slight rolling moment caused by trim changes not enough to worry about. Sound fair?
I like Sunfish's concept though.
Join Date: Feb 2001
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My turn;
Yes it was offset to alleviate potential tubulent flow from the pod @ high AOA.
Yes it was offset to keep it clear of jet efflux to alleviate the effect changes in power settings would have.
Yes it was offset to allow a simplified control mechanism down one boom.
The left however was selected over the right due to the symbiotic effect the slight rolling moment had on the gyroscopic effect induced by the large centrifigul compressors on both the NENE & Goblin engine variants during pitch changes.
The Coriolis effects although minor were compensated for by adjusting the magnetic fields using the flux valve. This was usually done on the compass swing when carrying out the southern hemisphere compensation bias on the compasses.
The latter of course was not required on Vampires fitted with Australian built NENE engines.
Doing my apprenticeship on these aircraft I discovered one of the above statements is not true. This would of course be apparent to the instructor seated in the two seat variant.
Next.
TT
Yes it was offset to alleviate potential tubulent flow from the pod @ high AOA.
Yes it was offset to keep it clear of jet efflux to alleviate the effect changes in power settings would have.
Yes it was offset to allow a simplified control mechanism down one boom.
The left however was selected over the right due to the symbiotic effect the slight rolling moment had on the gyroscopic effect induced by the large centrifigul compressors on both the NENE & Goblin engine variants during pitch changes.
The Coriolis effects although minor were compensated for by adjusting the magnetic fields using the flux valve. This was usually done on the compass swing when carrying out the southern hemisphere compensation bias on the compasses.
The latter of course was not required on Vampires fitted with Australian built NENE engines.
Doing my apprenticeship on these aircraft I discovered one of the above statements is not true. This would of course be apparent to the instructor seated in the two seat variant.
Next.
TT
I've a feeling it was to reduce the chances of nosewheel shimmy. Could be mistaken, though. The pattern wasn't peculiar the Vampire/Venom, I've seen it on the Dove, Heron and also on the Mosquito tailwheel.
