The effect of your seal is not much different to the standard set-up on
the Classic wing, which has a similar but narrower (about 1" rather than
1.25") rearward-projecting 'seal' built in, because of hte method of
construction.
I asked Don Dykin about this a few years ago (mainly in relation to a
question about the smoothness of the inner duct formed in the TE of the
wing, which is provided in the XS but not in the Classic). His view was
that the geometry of the duct was not critical to its operation. I guess
because it is a converging duct designed to merely 'blow' across the top
of the flap to delay or prevent its stall.
Duncan McF.
----- Original Message -----
From: Jeff B
To: europa-list@matronics.com
Sent: Tuesday, May 08, 2007 6:51 PM
Subject: Re: Europa-List: Thank you, John Lawton.
Pete and all,
I finally found the time and the photos. You can see the process and
end result here:
http://www.europaowners.org/modules.php?set_albumName=Flap-Seals-Baby-B
lue&op=modload&name=gallery&file=index&include=view_album.php
Jeff - Baby Blue
285 hours
Pete Lawless wrote:
Jeff
That rather suggests that this 'gap seal' does not just block the
gap with the flaps up but improves the airflow over the flap though the
gap when the flaps are down.
Is there a picture of it anywhere?
Regards
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Jeff B
Sent: 07 May 2007 16:06
To: europa-list@matronics.com
Subject: Re: Europa-List: Thank you, John Lawton.
Flaps down...
Jeff
Pete Lawless wrote:
Jeff Are you talking about landing flap up or flap down? Regards Pete
-----Original Message-----From:
owner-europa-list-server@matronics.com[mailto:owner-europa-list-server@ma
tronics.com] On Behalf Of William MillsSent: 07 May 2007 08:10To:
europa-list@matronics.comSubject: Re: Europa-List: Thank you, John
Mills"<william@wrmills.plus.com> Jeff,Why does the tape need to be so
wide, or does it just come in 2 1/4" widths? If you get a chance,
perhaps you could publish a photo.Best wishes,William ----- Original
Message ----- From: "Rman" <topglock@cox.net>To:
<europa-list@matronics.com>Sent: Sunday, May 06, 2007 3:51 PMSubject:
Europa-List: Thank you, John Lawton. --> Europa-List message posted
by: Rman <topglock@cox.net> Last year, I had the pleasure of flying into
John's airstrip, in Tennessee and visiting with him and his near
finished bird, for a while. In our conversation, John mentioned how
sealing up the aircraft would clean up the lines, resulting in better
speeds. As John said, the glider guys do it and it works. Well, while
I had Baby Blue disassembled and was cleaning her up for Sun-N-Fun
(which she did not make, as she was still ailing from the weak carb
spring incident) I decided to add some gap seals to the wing, to
seal the flaps, upon retraction. What I used was a 2.25" wide piece of
.020" styrene, a product that I use, almost daily in my sign/graphics
business. I attached it to the wing using 1" hem tape (a very strong,
two sided tape, used to hem banners). Once the engine was restored to
normal operating condition, the results were immediate and astounding.
I haven't done a complete test, yet, but the results seems to have
yielded about 4-5 kph at cruise. It has also resulted in more float,
during landing, which I attribute to reduced stall speeds. I say
reduced stall speeds, because, by reducing my final approach from 65 kph
to 60 kph, across the numbers, Baby Blue lands like she used to. I'll
be doing more extensive tests, as the weather settles. However, I am
extremely pleased with the initial results of the simple and inexpensive
mod. Thanks again, John for your suggestion... Jeff - Baby Blue284 hours
-- 269.6.4/790 - Release Date: 05/05/2007 10:34
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