Author: Clifford Dow <cdowjr@...> Time: Wed Dec 26, 2001 7:05 am PST Link
I have reached the point on my rudder where I have to
curl up the leading edge - the part where you tape it
to a pipe and curl it. Question - one side of the
skin has a bent 90 degree lip on the end of it. The
other side is just flat. It is my belief that the one
with the bent 90 degree lip is wrapped ON TOP of the
one without the lip. This might not seem intuitive
but that was what I got from the Ornoff video -
although it was not entirely clear. The theory being
that if you just wrapped the two and had no 90 degree
lip, then the very end of the top one would never lie
flat but curl up a bit. Maybe I have confused the
issue here, but if someone has an answer that would be
great.
Thx
cliff dow jr
cdowjr@y...
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Author: "Brian Peterson" <brian@...> Time: Wed Dec 26, 2001 7:38 am PST Link
Cliff,
I believe the plans show the 90 degree lip to be on the inside, acting likea small spar. even so, the flat outside lip will not lay completley flat. what i did was carefully but a small kick inward on the outside flat skin about 1/4 inch in from the edge of the skin so that it had a tendency to close the small gap.
For rolling the edge, i used a 1" piece of PVC and drilled it to the skin and put a cleco in every hole, bending only one section of skin at a time. work your way out of the upper portion of the rudder. it gets a little tricky once one skin is rolled and in the way of rolling the other skin. just have someone hold it out fo the way and try not to put a crease where the skin leaves the rear spar of the rudder. after i had cherrymaxed the two skinstogether, i used a rubber mallett to make some small adjustments to the completed leading edge of the rudder.
Hope this helps.
Brian
-7a Fuse
>>> Clifford Dow <cdowjr@y...> 12/26/01 10:05AM >>>
I have reached the point on my rudder where I have to
curl up the leading edge - the part where you tape it
to a pipe and curl it. Question - one side of the
skin has a bent 90 degree lip on the end of it. The
other side is just flat. It is my belief that the one
with the bent 90 degree lip is wrapped ON TOP of the
one without the lip. This might not seem intuitive
but that was what I got from the Ornoff video -
although it was not entirely clear. The theory being
that if you just wrapped the two and had no 90 degree
lip, then the very end of the top one would never lie
flat but curl up a bit. Maybe I have confused the
issue here, but if someone has an answer that would be
great.
Thx
cliff dow jr
cdowjr@y...
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Author: rsamuelson@... Time: Wed Dec 26, 2001 8:09 am PST Link
Cliff - I am about to roll these edges in a day or two. Definitely going to
rolll the 90 deg. lip inside the flat lip. Haven't decided on a method yet.
Clecos on the PVC pipe sounds interesting.
Avery sells an edge rolling tool (P/N 1042 at $14 ea) for prebending skins
edges on lap joints. I think Orndorff uses it in the Video.
Roy Samuelson
Alameda CA
Author: "Brian Peterson" <brian@...> Time: Wed Dec 26, 2001 8:39 am PST Link
i hadn't seen this tool, probably would have been nice. the pvc works good,steel pipe may be better if you wanted to drill it, but that would make oblonging the aluminum holes a possibility.
Brian
>>> <rsamuelson@a...> 12/26/01 11:09AM >>>
Cliff - I am about to roll these edges in a day or two. Definitely going to
rolll the 90 deg. lip inside the flat lip. Haven't decided on a method yet.
Clecos on the PVC pipe sounds interesting.
Avery sells an edge rolling tool (P/N 1042 at $14 ea) for prebending skins
edges on lap joints. I think Orndorff uses it in the Video.
Roy Samuelson
Alameda CA
Van's Air Force - World Wide Wing
www.vansaircraft.net
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Author: "Freddie Hegler" <MaxHegler@...> Time: Wed Dec 26, 2001 8:55 am PST Link
Actually, the one with the 90 degree flange goes closest to the spar. The
no-flange side lays on top of that. The flange gives the bend a stiffener
to keep the bend from being wavy.
Take Care,
Max
>From: Clifford Dow <cdowjr@y...>
>Reply-To: RV7and7A@yahoogroups.com
>To: RV-7A YAHOO GROUP <RV7and7A@yahoogroups.com>
>Subject: [RV7and7A] Rudder Leading Edge curling
>Date: Wed, 26 Dec 2001 07:05:45 -0800 (PST)
>
>I have reached the point on my rudder where I have to
>curl up the leading edge - the part where you tape it
>to a pipe and curl it. Question - one side of the
>skin has a bent 90 degree lip on the end of it. The
>other side is just flat. It is my belief that the one
>with the bent 90 degree lip is wrapped ON TOP of the
>one without the lip. This might not seem intuitive
>but that was what I got from the Ornoff video -
>although it was not entirely clear. The theory being
>that if you just wrapped the two and had no 90 degree
>lip, then the very end of the top one would never lie
>flat but curl up a bit. Maybe I have confused the
>issue here, but if someone has an answer that would be
>great.
>Thx
>cliff dow jr
>cdowjr@y...
>
>__________________________________________________
>Do You Yahoo!?
>Send your FREE holiday greetings online!
>http://greetings.yahoo.com
>Van's Air Force - World Wide Wing
>www.vansaircraft.net
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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Join the world’s largest e-mail service with MSN Hotmail.
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Author: "rp10294648" <rpflanze2@...> Time: Thu Dec 27, 2001 7:59 am PST Link
Cliff,
Personally, I wouldn't do the cleco trick, especially on the short
pieces that have to be bent pretty good. The key to getting a good,
flat skin joint is to evenly bend the skin along the ENTIRE joint
line. Really, Van's suggested way works very well. Just tape the
heck out of it with duct tape and bend agressively while pushing the
skin down on the table (to prevent bending at the spar line.)
BTW, you should always put a slight crease in the top edge to get it
to seat snugly against the bottom skin. Avery sells a tool for
this. Also, work the bend several times until the skin lays flat
with just the clecos holding it together. It if gaps with the
clecos, it will gap once it is riveted. The plans call out for
aluminum pop rivets here and they don't exert that much pull when
they set.
Of course, the only one to see this joint will be you and your
painter (same person in my case). Once the rudder and ailerons are
mounted, this joint is invisible so don't sweat it if it doesn't turn
out perfect.
Randy Pflanzer
RV-6 (N417G) sold
RV-7A (N524RP) empennage
--- In RV7and7A@y..., Clifford Dow <cdowjr@y...> wrote:
> I have reached the point on my rudder where I have to
> curl up the leading edge - the part where you tape it
> to a pipe and curl it. Question - one side of the
> skin has a bent 90 degree lip on the end of it. The
> other side is just flat. It is my belief that the one
> with the bent 90 degree lip is wrapped ON TOP of the
> one without the lip. This might not seem intuitive
> but that was what I got from the Ornoff video -
> although it was not entirely clear. The theory being
> that if you just wrapped the two and had no 90 degree
> lip, then the very end of the top one would never lie
> flat but curl up a bit. Maybe I have confused the
> issue here, but if someone has an answer that would be
> great.
> Thx
> cliff dow jr
> cdowjr@y...
>
> __________________________________________________
> Do You Yahoo!?
> Send your FREE holiday greetings online!
> http://greetings.yahoo.com