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Aeleron tips

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pilot4pay

Joined: 01 Jan 2007
Posts: 171
Location: Louisville, KY

Posted: Sat Jun 25, 2011 2:56 pm Post subject: Aeleron tips

Does anyone have any tips on the aileron tips?

The skins come bent pretty tight, I followed the new pictorial assembly guidance. When I got to trimming for the outboard tips, the dimensions in the drawing (640-a-1) just didn't make sense. The rib 4 rivet line is 195mm inboard of the untrimmed edge, the detail says add 15 mm to the rivet line and start the cut, which should be no more than 135mm from out board edge. 135+15 is 150mm, not 195.

Anyway, cutting in 135mm would have you cutting into the hinge. So I made a conservative add of 15mm from the end of the hinge, then drew straight lines to the corner of the bottom trailing edge and to a point 40mm back from the top bend. that is something on the order of 120mm cut back.

Started to try to fit the aileron tip cap on and it just isn't going to fit. Cutting deeper would make the problem worse.

Did anyone have any trouble figuring out how to trim the tip, or did you trim it to match the finished wing?

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_________________
Craig Smith
CH640 builder
SN: 0078

"Just think how stupid the average person is,
and then realize that half of them are even stupider!"
--George Carlin

Christian Tremblay

Joined: 22 Aug 2008
Posts: 25
Location: Montreal

Posted: Sun Jun 26, 2011 5:18 am Post subject: Aeleron tips

I Craig



Second email,



First, after wings tip assembly done, (my special conception) with a metal

wing tip, I understand ailerons where not sufficiently long anyway. I added

a small extention piece and fix the aileron tip on it.



I also do some minors adjustments on mesurement  for the paper tip stencil

to reflect minors differences on my aileron assembly. I think the zenith

mesurements are not very accurate for any assembly.



All that finishing job must be done when the aileron is assembly is fix on

the wing with clecos and the wing tip itself installed. Sure, It's an artist

job of trimming and assembly, but alum metal is a good an easy rework

material.



Good luck Craig.



See photos. 



Notes to buiders:  my own project wings, tail wings, rudder and center web

spars are for sale . Asks for photos.



Christian



 



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_________________
Christian Tremblay - Montreal, Qc
A guy who build a CH640 from plan - SN0059
www.zodiac640.com

Christian Tremblay

Joined: 22 Aug 2008
Posts: 25
Location: Montreal

Posted: Sun Jun 26, 2011 6:01 am Post subject: Aeleron tips

I Craig,



First email,



Yes, there are 3 photos about the tips. This is not a simple task, intall

and trim the tip for fitting. 

I started from mesurement from plan and made some adjustment. 



Check next photos for assembly



Christ

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_________________
Christian Tremblay - Montreal, Qc
A guy who build a CH640 from plan - SN0059
www.zodiac640.com

pilot4pay

Joined: 01 Jan 2007
Posts: 171
Location: Louisville, KY

Posted: Sun Jun 26, 2011 6:15 am Post subject: Re: Aeleron tips

Thanks for the information Chris. I figured there was something more to this. The tip blank supplied by Zenair appears to be for the AMD-2000. I don't know how different the ailerons are from the 2 models, but the blank looks nothing like the one in the plans or the one you made.

Will be setting aileron subassemblies on the shelf until the wings are finished. Will very likely have to make new tips anyway. They are easy parts anyway.

Thanks again.

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_________________
Craig Smith
CH640 builder
SN: 0078

"Just think how stupid the average person is,
and then realize that half of them are even stupider!"
--George Carlin

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