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vgstol(at)bigpond.net.au
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 Posted: Tue Dec 12, 2006 6:40 pm Post subject: VGs |
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Yes, removing the slats does improve the glide ratio.
The following figures are for a 701.
Speed is in Knots. Slats On / Slats Off
40 5.1 / 6.7
45 5.7 / 7.6
50 6.3 / 7.8
55 7.0 / 7.9
60 6.4 / 7.6
65 6.0 / 6.4
70 5.5 / 6.4
Cheers
JG
Savannah 19-4296
[quote][b]
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue Dec 12, 2006 7:38 pm Post subject: VGs |
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Those figures are significant. Especially for such a thick short wing. Could be the difference in making a good forced approach and just flying to the crash site.
Noel [quote]
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Eddie G.
Joined: 03 Nov 2006
Posts: 15
Location: Los Angeles, CA
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| Posted: Tue Dec 12, 2006 10:41 pm Post subject: Re: VGs |
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Question: When you remove the slats, you're decreasing the empty weight by X amount. So when you're doing these comparisons, do you need to add X amount of dead weight to the plane so that you're not comparing apples and oranges? I assume the weight has some effect on performance of the plane since for more weight you need more lift, which means more drag. At least it should affect the rate of climb and service ceiling, if nothing else.
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vgstol(at)bigpond.net.au
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| Posted: Tue Dec 12, 2006 11:32 pm Post subject: VGs |
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Good point Eddie. No I didn't take that weight difference into account. It
amounts to about 7 kg (15 lbs) for the two slats. That's about 10 litres of
fuel (less than 2 USgal). The standard onboard flight instruments wouldn't
be able to measure the effect of such a weight change.
JG
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jnjkimbell(at)HOTMAIL.COM
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| Posted: Wed Dec 13, 2006 4:58 am Post subject: VGs |
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Eddie, The slats weight(with paint) 14 lbs. They are so close to the C of G
that their effect will be Minimal (Johns word). Looking at the change in
structural integrity of the lift, about the only thing we agree on is that
the slats were designed to tunnel the wind for more lift, not supply lift
itself. Please note that the slats have no spar and they are attached to a
wing with a spar and has 4 attachments each side to hold the slat to the
wing, not the other way. I am removing my attachments today. My opinion is
"No loss in structural integrity", but this is not something I will test
till the wing comes off. Joe from FL
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raymondj(at)frontiernet.n
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| Posted: Wed Dec 13, 2006 6:16 am Post subject: VGs |
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Greetings,
The argument sounds like Engineers vs. Lawyers. It'll be interesting to see how it it works out.
Does anyone have any data on changes in the best angle of climb performance with only VGs.
Thanks,
Raymond Julian
Kettle River, MN.
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Avidmagnum
Joined: 18 Nov 2006
Posts: 19
Location: Wisconsin, Florida
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| Posted: Wed Dec 13, 2006 6:54 am Post subject: Re: VGs |
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hi John
My friend sugested that I bend some thin aluminum strips and tape them on each side of the old slat attachments as I cut and then ground them down. Sure helped me. Tom in Florida
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jnjkimbell(at)HOTMAIL.COM
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| Posted: Thu Dec 14, 2006 4:09 am Post subject: VGs |
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Tom Great Idea. I used the aluminum from some cans and it worked great. No
attachments so completely committed. What part of FL? I am close to Stuart.
Would like to look at your floats. Joe from FL
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Avidmagnum
Joined: 18 Nov 2006
Posts: 19
Location: Wisconsin, Florida
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| Posted: Thu Dec 14, 2006 5:30 pm Post subject: Re: VGs |
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Hi Joe
I'm up near Ocala. FA38 I'll be gone north for a bit but I'll let you know when I get back to Florida. Tried to send you a email but I must have goofed someting up. Merry Christmass from Tom in FL .....heading north. (Just wish I was taking my 701 with me!)
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