Author: "Dan Checkoway" <dan@...> Time: Tue Oct 1, 2002 5:20 am PDT Link
Anybody have any online (or emailable) pictures of bending the longerons?
I've got a half decent picture in my head of how I'm going to do it, but a
photo or two would help complete the picture a bit. Any tips and tricks or
advice are much appreciated.
Thanks in advance,
)_( Dan
RV-7 N714D (fuselage)
http://www.rvproject.com
Author: "Phil Birkelbach" <phil@...> Time: Tue Oct 1, 2002 7:13 am PDT Link
Hey Dan,
Here is a picture that I have of one of the longerons in the vice. I don't know if it will help much...
http://www.myrv7.com/viewimage.php?pictureid=165
This is log page where I recorded the ordeal...
http://www.myrv7.com/viewlog.php?chapterid=11
It's really not that bad. Just be patient and go slow. I had those things in and out of that vice so many times I almost got a blister. Just work from one end to the other nice and slow and don't be afraid to HIT that longeron. After you get it about where you think it ought to be you'll look and it will curve the other direction. Turn it 90 deg and pull on it a little here and there. Then you will have to go back and hit on it some more because taking the bend out one way also takes it out the other. It'll get there, and it's really not all that difficult but take your time and get it right.
Godspeed,
Phil Birkelbach - Houston Texas
RV-7 N727WB (Reserved)
http://www.myrv7.com
Fuselage
Airplanes never win battles with the ground. The best the airplane can hope for is a draw.
----- Original Message -----
From: Dan Checkoway
To: rv-list@m... ; RV7and7A@yahoogroups.com ; rv7-list@m... ; SoCAL-RVlist@yahoogroups.com
Sent: Monday, September 30, 2002 11:02 PM
Subject: [RV7Yahoo] pictures of bending longerons?
Anybody have any online (or emailable) pictures of bending the longerons?
I've got a half decent picture in my head of how I'm going to do it, but a
photo or two would help complete the picture a bit. Any tips and tricks or
advice are much appreciated.
Thanks in advance,
)_( Dan
RV-7 N714D (fuselage)
http://www.rvproject.com
Van's Air Force - World Wide Wing
www.vansaircraft.net
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
Author: "dimplemaster" <johnsiebold@...> Time: Tue Oct 1, 2002 7:13 am PDT Link
Dan,
I just happened to be beating my longerons into compliance last
night. The pictures in the manual are sufficient. What's tough to
describe is calibrating the varying forces and masses of your
situation. A pix can't do that. I used a rubber mallet, too lightly
at first, then overcompensated and, of course, over bent the shallow
curve. Go slowly. What really helps is heavy anchorage and a mighty
vise for stability and mass, otherwise it's like trying to drive a
nail through a board held in your hand. Forming the shallow curve is
mainly a matter of pecking away until you match the template, BUT,
when you remove the bow (curl) that forms in the other flange, the
curve opens a bit, so back to the hammer. It's iterative.
I think the least controlled job is removing the bow and twist.
There doesn't seem to be much for it except grab that sucker, one
hand as a fulcrum, and the other applying force, tweaking along the
length of the curve, and massaging out the bow. I left the aft end
clamped just behind the terminus of the curve while doing this. Then
I used an adjustable crescent wrench just forward of the forward
terminus to untwist.
Then back to the curve for more tweaking. And so on. It gets easier
as you literally get a feel for it, balancing the hammer
style/mass/density with the mass/stability of the vise/bench and your
strength/disposition and change increment. Watch out that the inside
radius of the angle isn't clamped by the vise and that you use thin
but sturdy enough padding to prevent jaw marks. Also, whether or not
it's a matter of the template being drawn on paper or some other
introduced distortion, my template makes the bend a teeny tiny bit
flatter midway, with maybe a slightly tighter radius within 10" of
the rear terminus. No, matter, the forward bend must match F721's
curve.
You want the whole mess flat along the top flange with the desired
curve in the other.
Then there's the sharp downward bend and twist. That's tonight. But
after establishing the shallow curve, this operation looks more like
brutality instead of finesse, much more to my liking.
Cheers.
John Siebold
Author: "Cary Rhodes" <rhodeseng@...> Time: Tue Oct 1, 2002 11:17 am PDT Link
Dan
The horizontal bend is not that difficult.
I made a template for the bend, actually I just cut out the shape
from the plan sheet and taped it to a piece of 1/8 paneling.
The vertical dive at the carry thru spar is more difficult to keep in
a vertical plane. After you get it clecoed to the fuse witht he side
skins on, you can fine tune the bend to match the shape of forward
fuse.
The angle stiffeners and such in the forward fuse tend to hold it all
together nicely.
But it looks like #*%% laying on the table by itself. Kinda looks
like its been in a car crash or been delivered by a ups driver.
Cary
fuse
--- In RV7and7A@y..., "Dan Checkoway" <dan@r...> wrote:
> Anybody have any online (or emailable) pictures of bending the
longerons?
> I've got a half decent picture in my head of how I'm going to do
it, but a
> photo or two would help complete the picture a bit. Any tips and
tricks or
> advice are much appreciated.
>
> Thanks in advance,
> )_( Dan
> RV-7 N714D (fuselage)
> http://www.rvproject.com
Author: "Dan Checkoway" <dan@...> Time: Tue Oct 1, 2002 11:17 am PDT Link
Can you avoid the twist by bending both longerons clamped together?
)_( Dan
----- Original Message -----
From: "dimplemaster" <johnsiebold@a...>
To: <RV7and7A@yahoogroups.com>
Sent: Tuesday, October 01, 2002 7:08 AM
Subject: [RV7Yahoo] Re: pictures of bending longerons?
> Dan,
>
> I just happened to be beating my longerons into compliance last
> night. The pictures in the manual are sufficient. What's tough to
> describe is calibrating the varying forces and masses of your
> situation. A pix can't do that. I used a rubber mallet, too lightly
> at first, then overcompensated and, of course, over bent the shallow
> curve. Go slowly. What really helps is heavy anchorage and a mighty
> vise for stability and mass, otherwise it's like trying to drive a
> nail through a board held in your hand. Forming the shallow curve is
> mainly a matter of pecking away until you match the template, BUT,
> when you remove the bow (curl) that forms in the other flange, the
> curve opens a bit, so back to the hammer. It's iterative.
>
> I think the least controlled job is removing the bow and twist.
> There doesn't seem to be much for it except grab that sucker, one
> hand as a fulcrum, and the other applying force, tweaking along the
> length of the curve, and massaging out the bow. I left the aft end
> clamped just behind the terminus of the curve while doing this. Then
> I used an adjustable crescent wrench just forward of the forward
> terminus to untwist.
>
> Then back to the curve for more tweaking. And so on. It gets easier
> as you literally get a feel for it, balancing the hammer
> style/mass/density with the mass/stability of the vise/bench and your
> strength/disposition and change increment. Watch out that the inside
> radius of the angle isn't clamped by the vise and that you use thin
> but sturdy enough padding to prevent jaw marks. Also, whether or not
> it's a matter of the template being drawn on paper or some other
> introduced distortion, my template makes the bend a teeny tiny bit
> flatter midway, with maybe a slightly tighter radius within 10" of
> the rear terminus. No, matter, the forward bend must match F721's
> curve.
>
> You want the whole mess flat along the top flange with the desired
> curve in the other.
>
> Then there's the sharp downward bend and twist. That's tonight. But
> after establishing the shallow curve, this operation looks more like
> brutality instead of finesse, much more to my liking.
>
> Cheers.
>
> John Siebold
> Van's Air Force - World Wide Wing
> www.vansaircraft.net
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/