Today's Message Index:
----------------------
1. 12:31 AM - wing root fairings (craig bastin)
2. 07:44 AM - Antennas for Europas (Fergus Kyle)
3. 09:52 AM - Re: tank support layups (Rowland Carson)
4. 09:52 AM - Re: Antennas for Europas (Rowland Carson)
5. 11:06 AM - Antennas for Europas (Fergus Kyle)
6. 04:18 PM - Re: tank support layups (Greg Fuchs)
7. 04:18 PM - Sun N Fun (Erich Trombley)
8. 05:57 PM - wing root fairings (Fred Klein)
9. 06:36 PM - Re: Sun N Fun (grroberts3@juno.com)
10. 06:55 PM - Re: wing root fairings (JR Gowing)
Message 1
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Subject: | wing root fairings |
Fred you mentioned in the antenna discussions, you have made some more
progress
on wing root fairings. I am sure must of the guys would be interested in
those pics.
craig
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Subject: | Antennas for Europas |
Hi,
Frans Veldman did a superb job of explaining the practicality of the
half-wave dipole in particular for a Europa because of its great vertical
fin area.
As he said, the 'gain' attributed to other forms is always at the
cost of overall effectiveness where contact with ground stations is a
concern. The flashlight ( 'torch) is the perfect example. It doesn't light
up areas behind it very well, but the forward gain is excellent.
Perhaps another antenna could be a fullwave circular wire inside the
aft fuselage and fed at the fuselage join halfway up, but then you'd need to
point the Europa to fire ahead or behind.
Thanks, Frans
Ferg
Message 3
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Subject: | tank support layups |
At 2009-02-23 22:46 -0800 Greg Fuchs wrote:
>I would suggest (if you haven't already) making sure to soak the tank with
>fuel for awhile, before fitting and glassing it, since it will expand
>slightly
Greg - I thought the gassing process was supposed to prevent this.
Certainly the new tank I have has been subject to that process.
In my conversation with Roger at the factory yesterday about several
aspects of tank mounting he was careful to mention that one
side-effect of the treatment is to make the epoxy more likely to
stick to the tank. He recommended a layer of polyethylene or similar
film between tank and layup to allow relative movement. However, he
didn't suggest soaking the tank with fuel beforehand.
Looks like another call to check could be worthwhile.
Thanks for all your tips about where interference between tank and
other structures might arise.
>I am sorry about your loss
Thanks for your kind words. It's a big change being without someone
who's shared your life for 40 years, and even worse (for the
survivor) when it comes rather suddenly. The period of adjustment
appears open-ended at present. As well as getting back to aeroplane
work, I am thinking about how Wilma's paintings might be published,
as inspiration to others who might be on the same spiritual journey.
regards
Rowland
--
| Rowland Carson LAA #16532 http://home.clara.net/rowil/aviation/
| 1190 hours building Europa #435 G-ROWI e-mail <rowil@clara.net>
Message 4
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Subject: | Re: Antennas for Europas |
At 2009-02-24 10:42 -0500 Fergus Kyle wrote:
>Perhaps another antenna could be a fullwave circular wire inside the
>aft fuselage and fed at the fuselage join halfway up, but then you'd need to
>point the Europa to fire ahead or behind
Fergus - apparently the directionality of a loop is not quite as
strong as one would assume. The "Morris Loop" has been around for a
while; see info at:
http://www.davemorris.com/dave/MorrisDFLoop.html
The author reckons that the theoretical null abeam may not be a real
disadvantage in practice. It's certainly another interesting
possibility for composite fuselages.
regards
Rowland
--
| Rowland Carson http://home.clara.net/rowil/
| <rowil@clara.net> ... that's Rowland with a 'w' ...
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Subject: | Antennas for Europas |
Rowland,
Quite right - not as critical as a flashlight, but my full-wave quad
on 7 megs got 15db less off the sides, made it worthwhile to aim. I once
flew a piper J3 which was equipped with an antenna that made it almost
impossible to contact without aiming - made the tower elves furious, as I
had to swivel to talk on ground control.
Cheers, Ferg
PS: The owner was an antenna designer for Bombardier's daddy, Canadair, and
kept playing with things.
Message 6
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Subject: | tank support layups |
Rowland,
>Greg - I thought the gassing process was supposed to prevent this.
>Certainly the new tank I have has been subject to that process.
My tank only swelled a few millimeters (on the back face of the tank).
If the swelling is constant over the entire surface of the tank, then the
long straight faces would give the worst-case example of tank expansion.
Hence the back face of the tank is the extreme example. I wish I knew how
much the old tanks expanded, then it would be easier to know for sure.
(If anyone has measured their tank expansion who had the old tank, feel free
to contribute).
I can only assume that I have the new tank, since a few millimeters is not
much. Some might consider it negligible. Still (if I DO in fact have the new
tank) a few extra millimeters of clearance to the controls will be
necessary, if you don't soak the tank, initially. Actually (based on my
experience), if allowances are given, and the tank is not bonded directly,
you would probably be fine without pre-soaking the tank. I will try to
measure it today, to see if I can get a better idea on the amount of
shrinkage.
>Thanks for your kind words. It's a big change being without someone
>who's shared your life for 40 years, and even worse (for the
>survivor) when it comes rather suddenly. The period of adjustment
>appears open-ended at present.
My thoughts are with you. I don't have much experience in this area. My
'separation' experience has to do with that ugly divorce word, and that was
very tough on me too, but no passing away was involved.
The memories stay, and the acute emotional pain does diminish, and the
sunlight shining through the clouds can be seen again, eventually.
Greg
Message 7
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Folks,
With less than two months to go before Sun-N-Fun I was wondering if we c
an start a list of who all will be attending, when, and contact info. I
can start off with myself and others can join in.
Erich Trombley
Classic 914
April 22nd - 26th
Flying into Tampa commercial
Camping
702-682-0219
Do not archive
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Message 8
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Subject: | wing root fairings |
> >
>
>
> Fred you mentioned in the antenna discussions, you have made some more
> progress
> on wing root fairings. I am sure must of the guys would be
> interested in
> those pics.
>
> craig
Sure Craig:
The "news" on my fairings follows:
The design remains the same; they mate with the stock fairing at the
spar, and would be able to be easily added to a completed aircraft.
As these photos show, there is now a companion piece which deals with
the underside and tucks under the trailing edge of the stock Europa
fairing...at the trailing edge of the wing (underside) and the leading
edge of the flap. Of course, the airflow in flight is just as
interested in the underside of the wing as it is the upper
surface...the more I looked at the stock situation, the more I
realized that something had to be done.
I am currently (very cautiously) trial fitting a set on my aircraft,
attempting to assure that, as the fairing is cut into the portions
which bond to the wing, the flap, and the aft fuselage, the smooth and
continuous curvature is maintained. (Thank God for clecos, hot glue,
and tongue depressors!). Note that the flap drive slot is now covered.
I am also dealing with the issue of air flow over and around the aft
portion of the fairing when the flaps are deployed. Just how to close
the volume opened up when the flaps are deployed and configure the
resulting surface is not yet resolved.
I have shipped a full set (uncut) to a fellow flyer (tri-gear) who is
going to use some magic adhesives and tape to attach them to his wing
and fuselage. (He plans to do some zero flap takeoffs and landings.)
He will fly some specific profiles with and without the fairings so we
will have some idea how they affect performance and efficiency of
flight...I'm hoping these tests will be performed prior to Sun N Fun.
I've been holding back on offering them to builders until I have some
idea of performance. Also, I've wanted to go thru the installation
process so I could write up some recommendations on how to position
and install them.
At this point, it seems clear to me that the positioning of the
fairing can only be accomplished w/ reasonable precision and symmetry
when the top molding is in one piece; thus, I expect to make up the
top and bottom moldings, trim them, mark them for cutting, and ship
them so. It will be up to the builder to do the cutting, make up and
fit the flanges, and do the finishing, etc. They come off the molds
pretty smooth, they are within a gnat's a__ of being perfectly
symmetrical, but they are not vacuum-bagged. Off the molds and
trimmed, the upper and lower shells (together) weigh just under one
pound port and starboard.
I will be bringing a fairing to Sun N Fun.
So...that's where things stand at the moment,
Fred
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Message 9
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On Wed, 25 Feb 2009 00:13:34 GMT "Erich Trombley"
<erichdtrombley@juno.com> writes:
Folks,
With less than two months to go before Sun-N-Fun I was wondering if we
can start a list of who all will be attending, when, and contact info. I
can start off with myself and others can join in.
Erich Trombley
Classic 914
April 22nd - 26th
Flying into Tampa commercial
Camping
702-682-0219
Do not archive
Gary R. Roberts
Conventional 914
April 21 to 25
Flying into Tampa commercial
520 307-7231
Do not archive
____________________________________________________________
Click to get free auto insurance quotes from top companies.
____________________________________________________________
Click to get free auto insurance quotes from top companies.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTImHaCNYbrVWqigpaHmscpcG9v2ylSCdxwrsiXQuiiNH6aL4kCE1q/
Message 10
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Subject: | Re: wing root fairings |
Fred
Thank you for the inspiring photos......
That is unbelievable work!
JR (Bob) Gowing 327 in Oz
Do not archive
----- Original Message -----
From: Fred Klein
To: europa-list@matronics.com
Sent: Wednesday, February 25, 2009 12:53 PM
Subject: Europa-List: wing root fairings
au>
Fred you mentioned in the antenna discussions, you have made some more
progress
on wing root fairings. I am sure must of the guys would be interested i
n
those pics.
craig
Sure Craig:
The =22news=22 on my fairings follows:
The design remains the same; they mate with the stock fairing at the spar
, and would be able to be easily added to a completed aircraft.
As these photos show, there is now a companion piece which deals with the
underside and tucks under the trailing edge of the stock Europa fairing..
.at the trailing edge of the wing (underside) and the leading edge of the f
lap. Of course, the airflow in flight is just as interested in the undersid
e of the wing as it is the upper surface...the more I looked at the stock s
ituation, the more I realized that something had to be done.
I am currently (very cautiously) trial fitting a set on my aircraft, atte
mpting to assure that, as the fairing is cut into the portions which bond t
o the wing, the flap, and the aft fuselage, the smooth and continuous curva
ture is maintained. (Thank God for clecos, hot glue, and tongue depressors
!). Note that the flap drive slot is now covered. I am also dealing with th
e issue of air flow over and around the aft portion of the fairing when the
flaps are deployed. Just how to close the volume opened up when the flaps
are deployed and configure the resulting surface is not yet resolved.
I have shipped a full set (uncut) to a fellow flyer (tri-gear) who is goi
ng to use some magic adhesives and tape to attach them to his wing and fuse
lage. (He plans to do some zero flap takeoffs and landings.) He will fly so
me specific profiles with and without the fairings so we will have some ide
a how they affect performance and efficiency of flight...I'm hoping these t
ests will be performed prior to Sun N Fun.
I've been holding back on offering them to builders until I have some ide
a of performance. Also, I've wanted to go thru the installation process so
I could write up some recommendations on how to position and install them.
At this point, it seems clear to me that the positioning of the fairing c
an only be accomplished w/ reasonable precision and symmetry when the top m
olding is in one piece; thus, I expect to make up the top and bottom moldin
gs, trim them, mark them for cutting, and ship them so. It will be up to th
e builder to do the cutting, make up and fit the flanges, and do the finish
ing, etc. They come off the molds pretty smooth, they are within a gnat's a
=5F=5F of being perfectly symmetrical, but they are not vacuum-bagged. Off the
molds and trimmed, the upper and lower shells (together) weigh just under o
ne pound port and starboard.
I will be bringing a fairing to Sun N Fun.
So...that's where things stand at the moment,
Fred
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