Wing root drilling

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Includes: Highlander, Escapade, Summit and SuperSTOL.
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BlainS
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Joined: Fri Aug 07, 2020 4:45 pm

Wing root drilling

Post by BlainS »

SSXL
Having problems grasping the instructions. How to find the position of doubler placement. I don’t see how these could be drilled with any accuracy on the bench or rotisserie. Not to mention the correct sweep which is vaguely referenced. On my previous plane there were hours of plumb bobs, measurements, digital angle finders etc involved.

Anyone with a couple good pictures and descriptions of what worked?
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BDA
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Joined: Mon Aug 22, 2016 11:25 am
Location: Kenai Alaska

Re: Wing root drilling

Post by BDA »

Put wings on plane without doublers

Then put doublers on the outside of spar with bolts

Mark and drill for rivets,

Then disassemble, put doublers on inside with clecos to check alignment
Then rivet and hysol with a waxed bolt through the spar mount holes

Then put wing on plane and ream to match the headrack fitting.
SuperStol XL Alaskan With Titan 340
N331AK. Shawn Taplin
Wing extensions,Symetrical Airfoil tail ribs (NACA 21)
Mods in progress: Heavier struts, Double slotted flaps
Goal: 15mph no wind
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BlainS
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Joined: Fri Aug 07, 2020 4:45 pm

Re: Wing root drilling

Post by BlainS »

Thanks Shawn. How are you locating the hole location in the spar? I have hole finders but not one the large.
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BDA
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Joined: Mon Aug 22, 2016 11:25 am
Location: Kenai Alaska

Re: Wing root drilling

Post by BDA »

Spars should have come with starter holes???

When you fit the wing to the plane- with strut - line starter hole up with head rack holes then ream to match.

I use a tapered punch to line everthing up
SuperStol XL Alaskan With Titan 340
N331AK. Shawn Taplin
Wing extensions,Symetrical Airfoil tail ribs (NACA 21)
Mods in progress: Heavier struts, Double slotted flaps
Goal: 15mph no wind
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BlainS
Seasoned Member
Posts: 50
Joined: Fri Aug 07, 2020 4:45 pm

Re: Wing root drilling

Post by BlainS »

No starter holes. There is a 1/16" dimple that faces the leading edge (90 deg to the spar pin) but nothing else. Might be time to check with factory.
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BlainS
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Joined: Fri Aug 07, 2020 4:45 pm

Re: Wing root drilling

Post by BlainS »

Ok, I was way overthinking this. Once I read the manual over and over it started to sink in. Got right wing rigged. The first image is the hole finder I made from a random brace from some other project. Notice the jongle offset. Never throw away random crap.
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BDA
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Posts: 707
Joined: Mon Aug 22, 2016 11:25 am
Location: Kenai Alaska

Re: Wing root drilling

Post by BDA »

Drill starter holes small so that when you ream to match the headrack any missaligment will be reamed out
SuperStol XL Alaskan With Titan 340
N331AK. Shawn Taplin
Wing extensions,Symetrical Airfoil tail ribs (NACA 21)
Mods in progress: Heavier struts, Double slotted flaps
Goal: 15mph no wind
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