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frank goodnight
Joined: 27 Dec 2011
Posts: 126
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 Posted: Wed Jan 02, 2013 5:57 am Post subject: CG ? |
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[img]cid:1357134427154(at)dclient.mail.yahoo.com[/img] If one decided to use VGS in place of the slats
on a 701, where would the datum line be? More importantly
how far back from the leading edge of the wing--at what % of cord-- would the CG range start?
New to the 701 Frank
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jlatimer1(at)cox.net
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| Posted: Wed Jan 02, 2013 6:25 am Post subject: CG ? |
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Frank,
You might try looking through this website. I placed the vg's on my HDS per their measurements and have been very pleased.
http://stolspeed.com/slats-v-s-vgs
Jerry
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of frank goodnight
Sent: Wednesday, January 02, 2013 6:57 AM
To: zenith701801-list(at)matronics.com
Subject: CG ?
[img]cid:093032414(at)02012013-00F0[/img] If one decided to use VGS in place of the slats
on a 701, where would the datum line be? More importantly
how far back from the leading edge of the wing--at what % of cord-- would the CG range start?
New to the 701 Frank
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JohnDRead(at)aol.com
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| Posted: Wed Jan 02, 2013 7:43 pm Post subject: CG ? |
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VGs are not a replacement for slats. VGs will make a poorly performing airfoil work better. Find a copy of Abbot and Von Doenhoff (A&VD) and read the chapter on how slotted airfoils work. The slat on the front of the 701 wing are a part of the airfoil. The slot is "carved" through the wing to create doubling of the lift coefficient of the airfoil. When the slats are removed you are entering the area of "experimental airfoils. Listers - before you flame me read the chapter in A&VD.
Regards, John
CH701 - Colorado - Jabiru 3300
Cell: 719-494-4567
Home: 303-648-3261
[quote][b]
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ronlee
Joined: 25 Dec 2006
Posts: 141
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| Posted: Sun Jan 06, 2013 10:09 am Post subject: Re: CG ? |
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I took the slats off my 701 and installed VGs three years ago and never looked back. I love them. The position of my trim tab did not change so that tells me the CG did not change any significant amount. The plane takes off easier, lands easier and may have gained a few miles per hour at the same throttle setting. Does the plane get as much attention without the slats, no, but that isn't why I fly.
If you own a 701 and haven't tried VGs please do not knock them.
When I read various forums and someone says I don't own one and have never tried it but this is my opinion, it makes the forums less useful.
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Ron Lee
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