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Wing Spare Angle

 
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alsmith



Joined: 04 Oct 2009
Posts: 12

PostPosted: Mon Oct 12, 2009 6:04 am    Post subject: Wing Spare Angle Reply with quote

We are building a CH 650.

Drawing 6B14 shows the Spar angle of 83 Degrees. which is how we set ours up.

Drawing 6W8 for the wing shows the Spar angle of 81 Degrees.

It sounds like we should use the 83 Degrees angle.

Input is appreciated.


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bryanmmartin



Joined: 10 Jan 2006
Posts: 1018

PostPosted: Mon Oct 12, 2009 7:24 am    Post subject: Wing Spare Angle Reply with quote

My 601XL plans show the center spar set at 81 degrees to the
horizontal, which puts it 78 degrees to the cabin floor. The cabin
floor slopes up 3 degrees from the horizontal. The lower flanges on
the center spar are set at 78 degrees for the front flange and 102
degrees for the rear. These are the same angles used on the wing spars.

The 650 uses the same wings set at a slightly greater angle of
incidence, so the 83 degrees sounds about right. That would put the
center spar at 80 degrees to the cabin floor. The wing spar should be
the same as the 601XL.

On Oct 12, 2009, at 10:04 AM, alsmith wrote:

Quote:

>

We are building a CH 650.

Drawing 6B14 shows the Spar angle of 83 Degrees. which is how we set
ours up.

Drawing 6W8 for the wing shows the Spar angle of 81 Degrees.

It sounds like we should use the 83 Degrees angle.


--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.


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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.
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aussiech650



Joined: 04 Oct 2009
Posts: 25
Location: Sydney, Australia

PostPosted: Mon Oct 12, 2009 6:09 pm    Post subject: Re: Wing Spare Angle Reply with quote

I am also building the 650 but I originally started building the 601 so I do have both sets of plans.
The error I believe is in the notation on the 650 plans 6-W-8 that says "To install top rear skin: support skeleton, use spar template from 6-B-13 to hold the spar at 9 degrees............." The template that they are referring to is actually on 6-B-14 (no big deal) but it is 83 degrees and would not be suitable for this purpose, you will need to make a new template at 81 degrees. This is because the angle of the spar in relation to the wing rib has not changed from the 601 to the 650 so the 81 degrees here remains correct it is only the angle of the wing spar in relation to the fuselage that has changed, hence the increased incidence by 2 degrees and the lower attachment position for the rear spar. I will advise ZAC of the issue with the drawing 6-W-8.


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