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fklein(at)orcasonline.com
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 Posted: Fri May 11, 2007 2:05 pm Post subject: Votex Generators |
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Graham,
Sorry I was not clear in my email to you. My references to Ted's radii
were to his trailing edge fillet were to the fillet at the rear of the
flap as viewed in plan form, not in cross section...I would not be one
to mess with Don and David's leading edge!
Fred
On Friday, May 11, 2007, at 02:05 PM, Graham Singleton wrote:
| Quote: | Fred
The stall on the Europa is critically affected by the position and
size of the LE radius, Don and his aerodynamicist friend David tweaked
the leading edge, it's quite a sharp radius and there is a minute
bulge underneath. Hard to spot it but it does have a marked effect if
it isn't accurate.
On a couple of Europas I was involved with (both Classics) I made
templates of the first 10 inches of section at about 8 stations and
the builders spent many hours sanding to these templates. The stalls
on both these aircraft are relatively benign, unlike that of G-KWIP.
Both are fast too. It is all too easy to sand off the bumps in the
section which are meant to be there.
I have tried to attach a dwg file of the section coordinates/
Graham
Fred Klein wrote:
>
> On Thursday, May 10, 2007, at 02:41 PM, Graham Singleton wrote:
>> VGs were applied to the wing and canard of a Long EZ, which has
>> laminar sections on both, to reduce stall speed, the VGs re energise
>> the laminar boundary layer and help to prevent separation after the
>> max thickness point of the section. Stall was reduced by 7 kts.
>> Graham
> So here's a question...
> Is it conceivable that adding VGs to the Europa could reduce the
> stall speed sufficiently to meet the LSA requirements?
--
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<aerofoil47in.dwg>
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grahamsingleton(at)btinte
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| Posted: Fri May 11, 2007 3:52 pm Post subject: Votex Generators |
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Neither would I! I was replying to your earlier email Fred, asking about
stall speeds & VGs
Graham
Fred Klein wrote:
| Quote: |
Graham,
Sorry I was not clear in my email to you. My references to Ted's radii
were to his trailing edge fillet were to the fillet at the rear of the
flap as viewed in plan form, not in cross section...I would not be one
to mess with Don and David's leading edge!
Fred
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rowil(at)clara.net
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| Posted: Sun May 13, 2007 2:33 pm Post subject: Votex Generators |
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At 2007-05-11 22:05 +0100 Graham Singleton wrote:
| Quote: | I made templates of the first 10 inches of section at about 8 stations
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| Quote: | I have tried to attach a dwg file of the section coordinates
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| Quote: | Content-Type: application/octet-stream;
name="aerofoil47in.dwg"
Content-Disposition: attachment;
filename="aerofoil47in.dwg"
Attachment converted: PowerBook HD:aerofoil47in.dwg (????/----) (0034C255)
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Graham - your attachment came through but won't open in TurboCAD Mac
(it just crashes the application, which is a bit unexepcted). What
version of .DWG is it made in? Is there any chance of creating a .DXF
export of it?
I'm replying off-list as I suspect this may not be an issue many folk
will want to follow in detail - but if others also report problems
opening your file, by all means take the correspondence back onto the
list if you wish.
regards
Rowland
--
| Rowland Carson PFA #16532 http://home.clara.net/rowil/aviation/
| 750 hours building Europa #435 G-ROWI e-mail <rowil(at)clara.net>
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jrgowing(at)bigpond.net.a
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| Posted: Sun May 13, 2007 3:04 pm Post subject: Votex Generators |
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Rowland
I am interested in checking my leading edge with a profile but I could not
open the file either because I don't have any special programs.
I guess if we had say an Excel file of coordinates covering the front few
inches we could all plot it on some cardboard or 3-ply and do our checks!
Mind you, I did not look in my build manual to see if the details were
there!
JR (Bob) Gowing UK Kit 327 in Oz
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ptiller(at)lolacars.com
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| Posted: Mon May 14, 2007 1:43 am Post subject: Votex Generators |
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Two nice variations of wing / root fillets there. I've also been sent a picture from John Lawton as well who has done something different yet again. May have to use one of these ideas on mine!!
Phil
Visit - www.EuropaOwners.org
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