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dougsnash(at)yahoo.com
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 Posted: Wed Nov 01, 2006 10:41 am Post subject: slats vs no slats |
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Hey guys, I'm still a ways away from having to worry
about VGs on my 701 project but figured I'd add a
little to the thought process.
Two years ago I attended one of Chris' design seminars
at Oshkosh. One of the statements he made with regard
to the CH-701 airfoil was, the leading edge of the
slat (not the leading edge of the main wing) is the
leading edge of the airfoil. Although the slat is
built as an add on to the wing to simplify
construction, it is actually more like cutting a slot
in a "normal" wing a few inches back of the leading
edge. This would suggest in my mind that the airfoil
shape of the CH-701 without the slat is actually a
totally new and untested airfoil.
The fact that the airfoil appears to be performing
well without the slat but with VGs suggests to me that
VGs are a very successful way to correct airflow
issues. I personally still would be concerned about
the stall characteristics of this new "unknown"
airfoil since it was not the airfoil Chris intended
when he designed the plane.
Just some food for thought.
Doug MacDonald
NW Ontario, Canada
CH-701 scratch builder
Working on cabin
do not archive
We have the perfect Group for you. Check out the handy changes to Yahoo! Groups
(http://groups.yahoo.com)
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billmileski
Joined: 07 Aug 2006
Posts: 68
Location: Ledyard, CT
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| Posted: Wed Nov 01, 2006 8:44 pm Post subject: Re: slats vs no slats |
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Yeah, it seems that way. I guess part of the reason I brought it up again, and am so curious about it, is that I was shocked to find a few people swearing by the results. It does seem like a huge configuration change, an afterthought on a design that has proven to be well balanced. Sure lights up the list a little, talking about it.
Maybe a few others would be scratching their heads if they read the claims and experiences of the author of stolspeed.com, regarding testing with and without slats, with and without VGs, and with the gap between the slats and airfoil sealed. The fact that he sells the VGs makes one want to seek addtional opinions. Anyway, interesting food for thought.
Sorry if I've seemed a little discourteous in some of my recent posts, I've been in a bit of a mood since a Bell 407 helicopter pilot blew my parked 701 onto its wing tip and nose, only two days after completion of a flawless 40 hour flight test period.
Bill
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NYTerminat(at)aol.com
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| Posted: Wed Nov 01, 2006 8:55 pm Post subject: slats vs no slats |
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Bill,
I am sorry about your mishap, I hope that tings work out for you. I believe that many of the posters have not visited the website and have only thrown out their own opinions without any facts.
Bob Spudis
do not archive
In a message dated 11/1/2006 11:47:18 P.M. Eastern Standard Time, mileski(at)sonalysts.com writes:
| Quote: |
Sorry if I've seemed a little discourteous in some of my recent posts, I've been in a bit of a mood since a Bell 407 helicopter pilot blew my parked 701 onto its wing tip and nose, only two days after completion of a flawless 40 hour flight test period.
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[quote][b]
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secatur
Joined: 02 Nov 2006
Posts: 50
Location: New Zealand
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| Posted: Fri Nov 03, 2006 2:40 am Post subject: Re: slats vs no slats |
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Oh god! don't u just hate it when u push the wrong button and have to start again? never as good the second time either lol!
OK newbie (120hrs ga, no UL exp), not sure where to post so don't kill me if I'm wrong! (Although Doug, I'm now in Australia, but orig from Montreal...so go easy eh?)
I'm (will be shortly) building 701..Having perused web extensively, I will build WITHOUT SLATS and use VGs...READ the site (stolspeed.com.au) thoroughly! IF you don't agree S'ok but good info anyway! I have talked to people associated and not associated and they have DONE THEIR HOMEWORK! ( Read AvWeb from 2003 if you want!) The kicker for me was ICP Savannah (still not sure I made the right choice! lol) Tested stolspeed's stuff and look on the site.."""Savannah VG"""
To make matters worse, I will be using Simonini 2st/2cyl/H2O cooled/105hp/ 115lbs allup....on the basis that 701 was originally designed for 2cyl/2st (Rotax 503/580)( Only changed when Rotax said 300hrs and replace crank as well!) I think slow speed and stol MUST suffer using heavier engine!
My 2 cents feel free to !$#(at)!#^^
Best Regards,
Steve
WA
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