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  #1  
Old 04-08-2009, 01:34 PM
rv8_builder rv8_builder is offline
 
Join Date: Feb 2007
Location: Pretoria South Africa
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Question How do I extend front seat back

Hi Rv8tors,

I temporarily installed the front seat back last weekend and it just barely contacts the "tall pilot" weldment. I haven?t riveted it together yet and need to extend it about 1" if using the stock hinge location.

Anyone done this before that can offer some advice on how to extend it

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  #2  
Old 04-08-2009, 01:45 PM
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flyeyes flyeyes is offline
 
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Default seat back extension

This one, IMHO, is a no brainer.

the vertical rails are a very simple part and you should just make new ones. The time invested in scabbing on extensions just isn't worth it, and you will see it every time you get into the airplane.

You could try recutting the ones you have, but I suspect they'll still be too short ;-)
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  #3  
Old 04-08-2009, 02:04 PM
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If you move the bottom seat hinge a similar distance back, things should work out fine with what you have.
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  #4  
Old 04-08-2009, 08:26 PM
chaskuss chaskuss is offline
 
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Location: SE Florida
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Andre,
I had the same problem. I ended up doing two mods, for the most utility. First, I installed a second hinge, 1.5" further aft of the stock hinge mounting point. This will allow use of the stock seat back when placed in the rearward hinge. The second thing I did was to make an extra seat back, two inches taller than stock. This can be used in either hinge point. See photos
Charlie Kuss



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  #5  
Old 04-09-2009, 03:54 AM
rv8_builder rv8_builder is offline
 
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Quote:
Originally Posted by jthocker View Post
If you move the bottom seat hinge a similar distance back, things should work out fine with what you have.
Jon,

Can you please confirm that moving the bottom of the seat back aft doesn't create any interference issues with the rear control stick.

Quote:
Originally Posted by chaskuss View Post
Andre,
I had the same problem. I ended up doing two mods, for the most utility. First, I installed a second hinge, 1.5" further aft of the stock hinge mounting point. This will allow use of the stock seat back when placed in the rearward hinge. The second thing I did was to make an extra seat back, two inches taller than stock. This can be used in either hinge point. See photos
Charlie Kuss
Charlie,

Did you use normal "hardware store" aluminum angle to make your taller seat back?

Thanks for the advice guys.
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Last edited by rv8_builder : 04-09-2009 at 03:56 AM.
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Old 04-09-2009, 06:51 AM
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jthocker jthocker is offline
 
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Andre and Nico
Yes, there is an interference with the rear stick. It's very easily resolved by getting an RV4 rear stick. It's bent already and works perfectly, although it needs to be cut off slightly. Also, the front seatbelt anchors will need to be shortened if you move the seat back bottom the maximum distance aft. If the seat is placed as far aft as possible, then the top horizontal angle will have to be moved down to clear the seat back brace.
Good luck
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Old 04-09-2009, 07:43 AM
chaskuss chaskuss is offline
 
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Quote:
Originally Posted by rv8_builder View Post
Charlie,

Did you use normal "hardware store" aluminum angle to make your taller seat back?
Andre,
I purchased a length of 6061-T6 "structural" aluminum. You can identify structural aluminum, because it has a radius in the inner vertex. Architectural aluminum has a sharp corner on the inside. It should never be used on an RV.
You should be able to purchase it locally at a metal supply shop.
I'm 6'4" tall, so I added a "filler" aluminum sheet at the top.
Charlie Kuss
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Old 04-09-2009, 12:12 PM
rv8_builder rv8_builder is offline
 
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Quote:
Originally Posted by jthocker View Post
Andre and Nico
Yes, there is an interference with the rear stick. It's very easily resolved by getting an RV4 rear stick. It's bent already and works perfectly, although it needs to be cut off slightly. Also, the front seatbelt anchors will need to be shortened if you move the seat back bottom the maximum distance aft. If the seat is placed as far aft as possible, then the top horizontal angle will have to be moved down to clear the seat back brace.
Good luck
Quote:
Originally Posted by chaskuss View Post
Andre,
I purchased a length of 6061-T6 "structural" aluminum. You can identify structural aluminum, because it has a radius in the inner vertex. Architectural aluminum has a sharp corner on the inside. It should never be used on an RV.
You should be able to purchase it locally at a metal supply shop.
I'm 6'4" tall, so I added a "filler" aluminum sheet at the top.
Charlie Kuss
Thanks for the info guys. I'll try to source some "structural" aluminum locally to replace the side angles. I'm 6'7" tall so its important I get this one right
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  #9  
Old 04-09-2009, 05:16 PM
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jthocker jthocker is offline
 
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Andre
It looks like you'll need the seat as far aft as possible. In that case, you don't have to replace the angles. You will in fact have to move that top horizontal down and therefore your angles will be long enough.
Best regards
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  #10  
Old 04-10-2009, 12:23 PM
rv8_builder rv8_builder is offline
 
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Quote:
Originally Posted by jthocker View Post
Andre
It looks like you'll need the seat as far aft as possible. In that case, you don't have to replace the angles. You will in fact have to move that top horizontal down and therefore your angles will be long enough.
Best regards
Thanks Jon,

I'll try that before replacing the side angles.
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