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vgstol(at)bigpond.net.au
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 Posted: Mon Jan 28, 2008 1:15 pm Post subject: VG's |
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Gday Ben.
Yeh, taping up the slots on an 801 just might work. Depends upon your CofG. Closing those slots makes the slats really part of the lifting airfoil and moves the center of lift forward a bit. Evidence from the 701 experiments showed that at cruise the slats give no lift at all, since several of us have found that the pitch trim did not change at all on removing the slats. But I tried closing the slots on my Savannah and it caused an aft CofG enough to be of concern. On the 801 that could be no problem since I think you start with a more forward empty CofG.
That extra wing area, and more forward lift, may be really good for the 801. Bill Wilcox tried VGs on his 801 (and he certainly did comprehensive testing), and the results weren't nearly as good as we consistently get on 701s. We don't know why?? - but notable is the much higher wing loading of the 801 - at MTOW about 12.9 lb/ftft compared to 9lb/ftft for the 701. So this will be a really interesting experiment, and could bring some good results.
Just be aware that an aft CofG is insidious, in that the aircraft feels much better - quicker and lighter pitch control and flies really well at speed, but 'bites' when you get really slow.....
Looking forward to hearing your results!
Tailwinds always,
JG
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amyvega2005(at)earthlink.
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| Posted: Mon Jan 28, 2008 1:34 pm Post subject: VG's |
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in regular level flight the slats are allready part of the airfoil. Cutting them off redueces the cord.
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