Author Topic: Spar fitting angles  (Read 5937 times)

Offline Richfroh

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Spar fitting angles
« on: November 22, 2014, 11:03:10 PM »
Is the angle of the Double Eagle wing strut fittings critical? I cannot find any reference to the installed angle and I am ready to drill my spars for them. Should they be inline with the stut? If so, how do I get the proper angle since my fuselage is not built yet?
Rich
Rich Frohmiller

Offline Steve

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Re: Spar fitting angles
« Reply #1 on: November 23, 2014, 08:56:21 AM »
Is the angle of the Double Eagle wing strut fittings critical? I cannot find any reference to the installed angle and I am ready to drill my spars for them. Should they be inline with the stut? If so, how do I get the proper angle since my fuselage is not built yet?
Rich
Rich:
All the DE builders I'm aware of have built the fus first - I think you probably have a question for Leonard - there may be some slack in how the fitting lines up to the lift strut angle with designer approval...
Steve

Offline rfeenstra

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Re: Spar fitting angles
« Reply #2 on: November 23, 2014, 03:08:54 PM »
I built the wings first.  I calculated the angle using distances derived from the plans and some geometry equations.  I also figured the effect of dihedral on the fitting angle.  It came out within a degree or so. 

Rob

Offline Kiwi55

Re: Spar fitting angles
« Reply #3 on: November 25, 2014, 04:15:22 PM »
On page 42 of my copy of the plans it shows an angle of 30 degrees for the spar to fuselage fitting.
Leonard has mentioned that the angle is different for the Cabin Eagle.
...Paul

Offline Richfroh

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Re: Spar fitting angles
« Reply #4 on: November 25, 2014, 09:33:29 PM »
My plans show 30 degrees for the fuselage attach fittings too, but no angle is specified for the strut fittings. I emailed Leonard and am waiting for a reply.
Rich Frohmiller

Offline Leonard

Re: Spar fitting angles
« Reply #5 on: December 03, 2014, 03:06:07 PM »
Hi All,
 The wing strut fitting angle for he cabin Eagle is 25 degrees

Offline Richfroh

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Re: Spar fitting angles
« Reply #6 on: December 03, 2014, 08:41:52 PM »
Leonard,
What about the angle for the Double Eagle?
Rich Frohmiller

Offline Richfroh

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Re: Spar fitting angles
« Reply #7 on: December 11, 2014, 10:19:20 PM »
Any Double Eagle builders have any input on this. I really would like to continue building my wings.
Rich Frohmiller

Offline Tom H

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Re: Spar fitting angles
« Reply #8 on: December 12, 2014, 07:57:56 AM »
Rich, on my set of DE plans #C-51, page 42 (4/17/10) shows the angle to be 30 degrees.  That is what we used when building the wing.  I have not measured the actual angle between the wing and strut.  But, from visual observation, the alignment between the strut and the strut attach fitting on the wing seems right on.
Tom H
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Offline Steve

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Re: Spar fitting angles
« Reply #9 on: December 12, 2014, 09:14:10 AM »
Sheet 42 from DE package I originally reviewed attached:

Offline Sam Buchanan

Re: Spar fitting angles
« Reply #10 on: December 12, 2014, 12:24:54 PM »
Sheet 42 from DE package I originally reviewed attached:
Seems Rich is trying to find the attachment angle for the strut fittings, not the root fittings. I could not find that dimension in the DE plans I checked.

If no angle dimension can be found I would probably drill only the bottom hole and locate the other holes after the plane is rigged. Access to the bolts could be through a lightening hole in the spar web.

Offline Richfroh

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Re: Spar fitting angles
« Reply #11 on: December 12, 2014, 12:42:54 PM »
Yes, it is the STRUT fitting angle I am looking for.
Rich Frohmiller

Offline Steve

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Re: Spar fitting angles
« Reply #12 on: December 12, 2014, 01:02:20 PM »
Sheet 42 from DE package I originally reviewed attached:
Seems Rich is trying to find the attachment angle for the strut fittings, not the root fittings. I could not find that dimension in the DE plans I checked.

If no angle dimension can be found I would probably drill only the bottom hole and locate the other holes after the plane is rigged. Access to the bolts could be through a lightening hole in the spar web.

Thanks Sam,
We've sure have been off the mark with the response to that question - see DE Sheet 41 attachment that accompanied my request for assistance from Leonard & Tom Hubbuch that I just sent out...
Happy Holiday's,
Steve

Offline Tom H

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Re: Spar fitting angles
« Reply #13 on: December 13, 2014, 09:23:50 AM »
Yeah, I just got a private reaming from Steve K for not paying enough attention to the question.  I could not find the angle for the spar/strut fitting in the plans, either. 

And, now, I wonder how we did install the fittings.  We finished the wing before the fuselage was finished.  Maybe just made some measurements, allowed some dihedral, and installed.  

I'll go to the airport and measure the angle.  Even though Stubby is a "bastard" DE, these parts are built to the plans.  May take several days to get it.
Tom H
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Offline Tom H

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Re: Spar fitting angles
« Reply #14 on: December 14, 2014, 04:21:45 PM »
I got out to the airport and measured the angle between the bottom of the spar and the main strut.  It was 30.5 degrees.  Checked both sides, they agree.
Hopes this answers that question, finally.   Maybe this info can be put onto DE Plans P41 (Spar Plate 4 Req) and put into the downloads for perpetuity.
Tom H
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