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Dimensioning Question

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Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Fri Sep 18, 2009 12:32 pm Post subject: Dimensioning Question

Hi All,



I am trying to position the F4-3 horizontal tail attach plates.  On page F4 of the plans, it shows a vertical dimension of 150 mm from the centerline of the rivets into the upper longeron to the centerline of the F4-3 horizontal tail attach plate.  Yet this puts the attach plate low in the opening between the upper and lower rear side skins.  To center the attach plate in this opening, this dimension should be closer to 135 mm.



I have found a couple of places in my new computer-generated plans where the dimensions were typed incorrectly during the transition, and I am concerned this is another case.



Could someone help confirm the vertical dimension to use for positioning the plates?  Thanks!

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Fri Sep 18, 2009 10:01 pm Post subject: Re: Dimensioning Question

Please disregard the last question.  I calculated the correct distance to be 143 mm from the top of the upper longerons based on the required stabilator deflections shown on page M50 and the position of the F27 stops.

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

pilot4pay

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

Posted: Mon Sep 21, 2009 3:53 am Post subject: Re: Dimensioning Question

You have computer generated plans??????

when did this happen?

_________________
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

Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Mon Sep 21, 2009 10:18 am Post subject: Re: Dimensioning Question

Hi Craig,



I took delivery of my plans in January 2008.  Presumably to change to computer-generated plans happened some time in late 2007, because I don't know if anyone else on this list who has them.



BTW, I sent my dimensioning question to the factory.  They replied saying they checked their assembly fixture, confirmed that my numbers were correct, and that they have updated the F4 drawing.

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

pilot4pay

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

Posted: Tue Sep 22, 2009 3:21 am Post subject: Re: Dimensioning Question

I'm glad to hear that Zenair has decided to start tending to the ch-640 again. For a while there it seemed the 640 had become the unwanted step child of the Zenith line. Did you notice if the wing spar error that Chris Tremblay had found is now updated in the drawings?

I had tried in an earlier post to coax folks to help keep track of updates on this list so everyone all had the latest information, as Zenair does not care to inform the 640 crowd of any changes. The only thing that's changed on the website since 2005 is the price of the kit.

Hopefully they include an updated set of drawings with my fuselage kit.

_________________
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

Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Tue Sep 22, 2009 9:23 am Post subject: Re: Dimensioning Question

All they did was transfer the hand-drawn plans to computer-drawn.  The wing spar error is still in the plans.  



They also added a few typographical errors in the transfer.  Luckily in a couple of places, I could compare a picture of the hand-drawn plans (e.g. P1010080.65.jpg in the Stage 2 fuselage directory) with my computer-drawn version and resolve the differences.  But most of the time I had to calculate the correct numbers.  I still plan on posting the corrections I have found so far, but I wanted to collect them into one document first.  I'll start a new thread when I get this together.



I wish we had a centralized web site (something like http://www.ch601.org/builder%20resources.htm) where we could post our collective knowledge about the CH640.  Searching through this email list is not optimal for future builders.

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

carlossa52(at)gmail.com
Guest

Posted: Tue Sep 22, 2009 9:39 am Post subject: Dimensioning Question

Matronics has a Wiki you could use for this purpose...



http://wiki.matronics.com/wiki/index.php/Main_Page



Carlos

CH601-HD,plans

Montreal, Canada

 

2009/9/22 Scott Stewart <scott_stewart(at)agilent.com (scott_stewart(at)agilent.com)>

 	  Quote: 	
		   --> Zenith640-List message posted by: "Scott Stewart" <scott_stewart(at)agilent.com (scott_stewart(at)agilent.com)>

 

 ..

	
 

[quote] I wish we had a centralized web site (something like http://www.ch601.org/builder%20resources.htm) where we could post our collective knowledge about the CH640.  Searching through this email list is not optimal for future builders.

  

 --------

 Scott Stewart

 s/n: 0092

 Building from plans

 Rudder and Stabilator complete.  Wings at 65%.  Fuselage at 40%.

 

 

 

[b]

Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Tue Sep 22, 2009 11:03 am Post subject: Re: Dimensioning Question

That's great !  I didn't know about the Wiki feature.



I have started the CH640 wiki at http://www.matronics.com/wiki/index.php/CH_640.  I will fill in the errata page with the items I have collected so far.

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

Scott Stewart

Joined: 29 Jul 2008
Posts: 30
Location: Windsor, California

Posted: Wed Sep 23, 2009 1:48 pm Post subject: Re: Dimensioning Question

I have populated the CH640 errata wiki page at http://www.matronics.com/wiki/index.php/Complete_CH_640_Errata with everything I have collected so far.  



This is a public page which can be freely edited by everyone.

_________________
Scott Stewart
CH-640 built from plans
Flying since August 2014

pilot4pay

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

Posted: Fri Sep 25, 2009 6:07 am Post subject: Re: Dimensioning Question

Great thing you've done there Scott. I don't know how many on this list received the e-mail yesterday from Zenair. Anita announced that anyone with a 640 serial number can upgrade their plans to the computer drawings for $150.

I think someone is finally reading this list at Zenair.

_________________
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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