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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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 Posted: Thu May 01, 2008 3:28 pm Post subject: Fuselage width at Instrument Panel |
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Looking at the plans and the photo guide I ran into something I couldn't reconcile. It looked like the plans wanted the fuselage width set at 990 mm at the panel face (with the panel web 475 mm from the firewall web, measured along the longeron) with the ends of the panel 36 mm from the outside of the longeron to allow for the canopy rails, etc.
Well, the piece that fits atop the longeron and against the panel end (6C1-1) is only 30 mm wide which left a gap of 6 mm between it and the panel. I asked ZAC about this and they said the plans and photo guide need correction. With the panel at 475 mm, the width of the fuselage at the panel face should be 978 mm. At the aft end of 6C1-1 it will be 990 mm. This allows for a snug fit between the inst panel and 6C1-1.
I'm sure many of you had figured this out on your own but I like to be sure of my facts before I drill holes. I'm sure someone will run into this and have the same questions I did 
Tim Juhl
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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| Posted: Thu May 01, 2008 5:12 pm Post subject: Re: Fuselage width at Instrument Panel |
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Tim,
My plans show the fuselage as 495 x 2 = 990 at the panel face. (6-B-14) It shows the panel as 469 x 2 = 938 (6-B-12). The difference is 52/2 = 26 mm. It shows the Panel Side Angle as 28mm wide. 6-C-1. OK my plans are 2003 vintage, but at least on these it pretty much adds up. Maybe if I knew where you got the 36mm from I'd understand your puzzlement.
Dan
| Quote: | "Tim Juhl"]Looking at the plans and the photo guide I ran into something I couldn't reconcile. It looked like the plans wanted the fuselage width set at 990 mm at the panel face (with the panel web 475 mm from the firewall web, measured along the longeron) with the ends of the panel 36 mm from the outside of the longeron to allow for the canopy rails, etc.
Well, the piece that fits atop the longeron and against the panel end (6C1-1) is only 30 mm wide which left a gap of 6 mm between it and the panel. I asked ZAC about this and they said the plans and photo guide need correction. With the panel at 475 mm, the width of the fuselage at the panel face should be 978 mm. At the aft end of 6C1-1 it will be 990 mm. This allows for a snug fit between the inst panel and 6C1-1.
I'm sure many of you had figured this out on your own but I like to be sure of my facts before I drill holes. I'm sure someone will run into this and have the same questions I did :-)
Tim Juhl |
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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Thu May 01, 2008 7:42 pm Post subject: Re: Fuselage width at Instrument Panel |
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Dan,
If you check the panel on 6B12 (DATED 3/06) the panel is 2 x 459 mm (not 469) or 918 mm. Subtract that from 990 and you get 72. 72 divided by 2 is 36 which explains why the photo guide says to make a mark 36 mm in from the edge of the longeron on the gusset which should line up with the end of the panel. Sounds reasonable but if you look further ahead in the plans you will find the problem.
Take a look at page 6C1 in the plans. 6C1-1 sits atop the longeron from the back of the firewall to just beyond the instrument panel. It's outside edge is flush with the longeron's outside edge. The instrument panel is supposed to butt up against 6C1-1 on the inside, BUT the bottom flange of 6C1-1 is only 30 mm wide whereas if you follow the plans and photo guide the gap there would be 36 mm! That is why I contacted ZAC. The actual end spacing should be adjusted so that the instrument panel and 6C1-1 fit together. IF you reduce the width at the front of the instrument panel to 978 mm as recommended by ZAC, everything fits. The 990 mm width will actually be achieved at the aft end of 6C1-1 because the longerons diverge outwards as you go towards the rear before taking a bend in as you move towards the tail.
Did I do a better job of explaining it this time?
Tim
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Thu May 01, 2008 7:59 pm Post subject: Re: Fuselage width at Instrument Panel |
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Dan,
I re-read your email and picked up on the fact that your plans were from 2003.
On a hunch I went to the builder's pages and checked for changes to page 6B12 since your plans came out. Here is what I found:
2/2005 width of instrument panel changed from 938 mm to 934 mm
7/2005 width of instrument panel changed from 934 mm to 918 mm.
My panel measures 918 mm - perhaps yours does not. In that case, I may be dealing with a problem that doesn't exist for you.
One thing for others to take from this is that if you buy updated plans you better check to make sure that your parts match the current plans in dimension if they were purchased earlier.
Tim
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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| Posted: Fri May 02, 2008 5:04 am Post subject: Re: Fuselage width at Instrument Panel |
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Tim
You're right my plans don't have the problem. Plus i get 20 mm instrument panel :)
You didn't say if you are building from plans or kit. But building from plans I had no problem in the area you are reporting. Good luck getting it straight.
Dan
| Quote: | ="Tim Juhl"]Dan,
I re-read your email and picked up on the fact that your plans were from 2003.
On a hunch I went to the builder's pages and checked for changes to page 6B12 since your plans came out. Here is what I found:
2/2005 width of instrument panel changed from 938 mm to 934 mm
7/2005 width of instrument panel changed from 934 mm to 918 mm.
My panel measures 918 mm - perhaps yours does not. In that case, I may be dealing with a problem that doesn't exist for you.
One thing for others to take from this is that if you buy updated plans you better check to make sure that your parts match the current plans in dimension if they were purchased earlier.
Tim |
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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