bushes
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@doctors.org.uk> wrote:
>
> 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
> ----- Original Message ----- From: "Andrew Sarangan" <asarangan@gmail.com>
> To: "Europa List" <europa-list@matronics.com>
> Sent: Tuesday, November 29, 2011 6:57 PM
>
> Subject: Europa-List: Setting angle of incidence for bonding spar alignment
> bushes
>
>
>>
>> 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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