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asarangan(at)gmail.com
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 Posted: Tue Nov 29, 2011 11:00 am Post subject: Setting angle of incidence for bonding spar alignment bushes |
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I am about to embark on bonding the spar alignment bushes into the
cockpit module (chapter 14). The manual says to set the wing spar
parallel to the front of the seat back, and that this is good enough
for now. That seems rather arbitrary to me, given that the tolerance
required later is 2.5 +/- 0.05 degrees. I am confused how the angle of
incidence can be adjusted in the future with the bushes already bonded
in. Would it not be best if the bushes are bonded after setting the
2.5 deg incidence? But then I am uncertain how to infer the angle of
incidence with the cockpit module sitting face down on the floor. Any
thoughts from experienced builders would be appreciated!
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pjeffers(at)talktalk.net
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| Posted: Tue Nov 29, 2011 11:27 am Post subject: Setting angle of incidence for bonding spar alignment bushes |
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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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kingsnjan(at)westnet.com.
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| Posted: Tue Nov 29, 2011 12:53 pm Post subject: Setting angle of incidence for bonding spar alignment bushes |
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Andrew,
I shared your dilemma when at the same stage.
A couple of pertinent points that may assist ......
1 When the cockpit module is installed, the seat back is reclined at 2.5 degrees to the horizontal axis of the aircraft hence the need to set up the spars parallel to the seat back..
2 You will find that the bushes you have to fit are quite a sloppy fit on the main wing pins which allows for considerable tolerance.
3 I'm fairly sure the 2.5 +/- 0.05 degrees reference is in relation to each wing rather than the incidence setting overall.
If you go ahead as per the manual taking as much care as you can, you can expect things to turn out like you hope.
All the best
Kingsley
Sent from my iPhone
On 30/11/2011, at 4:57 AM, Andrew Sarangan <asarangan(at)gmail.com> wrote:
| Quote: |
I am about to embark on bonding the spar alignment bushes into the
cockpit module (chapter 14). The manual says to set the wing spar
parallel to the front of the seat back, and that this is good enough
for now. That seems rather arbitrary to me, given that the tolerance
required later is 2.5 +/- 0.05 degrees. I am confused how the angle of
incidence can be adjusted in the future with the bushes already bonded
in. Would it not be best if the bushes are bonded after setting the
2.5 deg incidence? But then I am uncertain how to infer the angle of
incidence with the cockpit module sitting face down on the floor. Any
thoughts from experienced builders would be appreciated!
|
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davidjoyce(at)doctors.org
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| Posted: Wed Nov 30, 2011 2:33 am Post subject: Setting angle of incidence for bonding spar alignment bushes |
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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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