Craig,
The spar strap has no role for fitting the wings correctly. Its purpose is
to prevent twisting of the spars under heavy load during flight. I followed
the BM sequence, and experienced no problems with pins locating in the
bushes after making the spar strap.
The really important step is to fit the pin sockets correctly. Their
location must not be influenced by any priority given to the spar strap - if
the strap should inadvertently be made such that the wings get different
angle of incidence, this is not what you want. Follow the build
instructions, however, and the strap should cause you no problems.
////
Setting the correct angle of incidence: I followed the manual, and have no
noticeable difference in wing lift during flight (the small left wing drop
when solo is gone when having a passenger). Others have recommended setting
the angle not at the root but further out on the span, as this is a more
important part of the wing (you may search the archive), but I do not know
how they have adjusted for wash-out when establishing the angle to set.
When you set the wings at the correct angle to bond the lift pin sockets,
you will of course somehow lock the wing's leading and trailing edges. I
locked the wing to the fuselage rather than to the floor of the workshop, by
clamping pieces of wood to the fuselage sides (clamp going over the door
sills). If you use a digital angle meter rather than a bubble level, I
recommend that you anyway check with a bubble level that the last wing does
get the same angle as the first one (mark the bubble position on the glass)
- the level is more accurate and does not change its calibration.
Good luck!
Svein
LN-SKJ
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Fra: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] P vegne av craig bastin
Sendt: 13. august 2008 10:48
Til: europa-list@matronics.com
Emne: Europa-List: Spar Strap layup vs lift pins
I now have my spar pins fitting beautifully and I am up to fitting the lift
pin sockets/drag bar and I was reading
further through the chapter about the spar strap I have concerns about
fitting the pin sockets etc and then
doing the spar strap after that, mainly that the strap may hold the wings at
a slightly different angle to
the rigged position in the AC. I feel i should probably do the spar strap
first effectively locking the
wings together for when i do the lift pins/drag bar.
Rather than doing the pin sockets, then the spar strap, only to find that
the pins no longer
locate in the sockets easily.
Has anyone had an issue with this or am i worrying about nothing
craig
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