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asarangan(at)gmail.com
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 Posted: Tue Nov 29, 2011 11:57 am Post subject: Setting angle of incidence for bonding spar alignment bushe |
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Hi Pete,
Thanks for that response. It is good to know that the drilled holes
are predetermined for the correct angle. My concern actually arose
from reading others' posting that the the pins were difficult to
engage, which I assumed came from small twists during the angle
setting process. These are long bolts, so I suspect even a fraction of
a degree rotation would cause the holes to become misaligned. If I
could somehow verify using some reference points inside the cockpit
module that the bushes I am about to bond are actually at the correct
angle, that would be a great relief.
On Tue, Nov 29, 2011 at 2:24 PM, Peter Jeffers <pjeffers(at)talktalk.net> wrote:
[quote] Hi Andrew,
The wing incidence is pre determined by the pre drilled bushes in both the
wing spars and the fuselage. The angle of attack does need to be set by
you. Parallel to the front of the seat back refers to both spars being
parallel to the seat back when viewed from ABOVE.
Hope this will give you a different view on the problem
Pete Europa club LAA inspector
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pjeffers(at)talktalk.net
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| Posted: Tue Nov 29, 2011 12:25 pm Post subject: Setting angle of incidence for bonding spar alignment bushe |
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Hi Andrew,
It is a long time ago that I did this bit so my memory is a little hazy but
the pins are not actually a tight fit and the bushes themselves are quite
short. I have worked with a number of builders through this phase and none
have had a problem. To be quite honest none of them have really raised any
questions, they followed the instructions in the manual and all worked OK.
It is good that you have thought through and anticipated problems but in
this instance it probably seems worse than it is.
Pete Europa Club LAA inspector
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asarangan(at)gmail.com
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| Posted: Wed Nov 30, 2011 6:01 am Post subject: Setting angle of incidence for bonding spar alignment bushe |
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So, if I am understanding it correctly - set the spars firmly against
the seat-back, then set the seat-back perfectly square against the
canoe side walls when bonding the cockpit module, then all should be
ok.
If the manual had a stated that the seatback is already set at 2.5
degrees inclination this question would not have come up at all. I
have found this in several areas of the manual. It tells you what to
do but leaves out the why. It might be useful someday to create a user
commentary addendum for each chapter, based on the insights and
experience from other builders. May be that is something I can work on
in the future.
On Wed, Nov 30, 2011 at 5:29 AM, David Joyce <davidjoyce(at)doctors.org.uk> wrote:
[quote]
Andrew, A couple of points possibly of value :
1) When setting up the wings the manual (or at least my version of it) talks
about checking that the distance from wing tip to tail on each side is the
same. This manoevre led me to all sorts of confusion, which was only settled
when I realised that there is only one sensible location for the spars and
that is tight against the seat back. You definitely do not want the spars
set back from the seat back with the spar pins bridging the gap, which would
be asking the spar pins to do more than they are designed for. I would
advise setting up the spars with some pieces of wood jammed behind them in
the tunnel to ensure they are tight aginst the seat back. If one wing tip is
a 1/2" closer to the tail than the other it is because the fueslage or your
fixing of the cockpit module is less than absolutely symmetrical, but it is
of no consequence.
2) The location of the spars gives an approximation to the right rigging
angle for the wings, but the precise angle is set by your positioning of the
lift pins. I would strongly recommend buying or borrowing a Smartool (which
measures to 1/10 degree, to ensure that you get the two wings set as close
the same angle as possible. Even a small difference in rigging angle will of
course leave you with an irritating lateral trim issue and quite possibly to
a built in tendency to drop a wing in the stall.
Regards, David Joyce, G-XSDJ
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