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carlossa52(at)gmail.com
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 Posted: Sun Apr 04, 2010 3:37 pm Post subject: 601HD(S): bottom fuse skin |
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As I examined the fuselage plans, I noticed the bottom skin sides aren't straight: where the front (6F1-1) and rear (6F1-2) parts join, there is an angle.
This raised a concern: as the bottom longeron is straight, won't I have problems with edge distance when I drill holes on the longeron?
(see attached drawing - obviously not on scale - where the blue part is 6F1-2, the blue part is 6F1-1 and the longeron is the long blue rectangle).
Or I could make the bottom ski straight, but this could have a ripple effect (i.e., 6F1-2 (front H.T. frame) might need to be wider, which would in turn affect 6F2-6 (rear panel, top) and God know what else...).
I would appreciate any comments from those that have been there (and still remember).
Carlos
CH601-HD, plans
Montreal, Canada
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John Livsey
Joined: 03 Jun 2009
Posts: 1
Location: Melbourne Australia
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| Posted: Mon Apr 05, 2010 12:53 am Post subject: Re: 601HD(S): bottom fuse skin |
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Hi Carlos,
I had trouble figuring out the question but looking at the plans I finally realised what your problem is. From memory (My CH601HDS has been flying 5 years) the longerons arn't straight (Well mine arn't) they actually have a slight bend at 6F2-1. Again from memory when I built the tail section I came up against the same problem you have but just pulled the longerons into the right position. Other builders may disagree with this however, will be interested to see if you get other replies.
I could try and get a picture of mine if you are interested.
Regards John.
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CH601-HDS Flying
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godobcn(at)gmail.com
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| Posted: Mon Apr 05, 2010 1:25 am Post subject: 601HD(S): bottom fuse skin |
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Carlos,
My experience was the same and I had the same doubts...
Of course Larry holds a masters degree in workmanship, that I wish I
had, so instead I just fit the longerons with some tension, and it
turned fine.
Once done, feeling the strenght of the box, I must confess I thought
it was meant to be a design feature to strengthen the bottom section
of the fuselage...
Cheers!
Godo... ...just to pages ahead of you...
601HD TD
Barcelona (Spain)
On Mon, Apr 5, 2010 at 1:36 AM, Carlos Sa <carlossa52(at)gmail.com> wrote:
| Quote: |
As I examined the fuselage plans, I noticed the bottom skin sides aren't straight: where the front (6F1-1) and rear (6F1-2) parts join, there is an angle.
This raised a concern: as the bottom longeron is straight, won't I have problems with edge distance when I drill holes on the longeron?
(see attached drawing - obviously not on scale - where the blue part is 6F1-2, the blue part is 6F1-1 and the longeron is the long blue rectangle).
Or I could make the bottom ski straight, but this could have a ripple effect (i.e., 6F1-2 (front H.T. frame) might need to be wider, which would in turn affect 6F2-6 (rear panel, top) and God know what else...).
I would appreciate any comments from those that have been there (and still remember).
Carlos
CH601-HD, plans
Montreal, Canada
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naumuk(at)windstream.net
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| Posted: Mon Apr 05, 2010 5:46 am Post subject: 601HD(S): bottom fuse skin |
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Carlos-
I had the same trouble visualizing your problem, but my fuse is the same
as John's, if that's any help. The bend isn't as extreme in reality as it
seems on paper.
Bill
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entecrj(at)sbcglobal.net
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| Posted: Mon Apr 05, 2010 7:06 am Post subject: 601HD(S): bottom fuse skin |
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Carlos:
The attached picture is one I took of the bottom of my fuselage several years ago.
If you look close you can see that the rivet line is not exactly parallel to the edge of the longeron.
I could take another look at it the next time I am out at the shop where the plane is stored, and let you know how much deviation there is between the rivet line and the edge of the longeron.
Russell Johnson
601-HDS
[quote] ---
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