Vertical Stab Aft Spar

Discussion for builders, pilots, owners, and those interested in building or owning a second generation Sonex or Waiex.

Vertical Stab Aft Spar

Postby pfhoeycfi » Sun Feb 25, 2018 8:17 pm

There are 8 AN3-6A bolts that secure the aft spar strap to the lower spar channel. The plans say to use 2 washers per but the bolts appear too long. ..at least 1 washer thickness too long when the nut is tightened all the way...allowing the bolts to spin. Easy enough to fix but it doesn't make sense that the plans would show bolts that are too long. I am wondering if there is something else added later. I only have the tail plans.
Peter Hoey
SEL Pvt, Comm Glider, CFIG, Pawnee & L19 Towpilot
Philadelphia Glider Council
Sonex B SNB0021, N561PH, Taildragger, Aerovee Turbo, MGL MX1, First flight Dec 18, 2022
Also built Sonerai IIL N86PH
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Re: Vertical Stab Aft Spar

Postby pfhoeycfi » Sun Feb 25, 2018 8:21 pm

...Sonex B tail
Peter Hoey
SEL Pvt, Comm Glider, CFIG, Pawnee & L19 Towpilot
Philadelphia Glider Council
Sonex B SNB0021, N561PH, Taildragger, Aerovee Turbo, MGL MX1, First flight Dec 18, 2022
Also built Sonerai IIL N86PH
pfhoeycfi
 
Posts: 377
Joined: Wed Jun 28, 2017 3:45 pm

Re: Vertical Stab Aft Spar

Postby gammaxy » Sun Feb 25, 2018 8:35 pm

I had the same problem with the A model plans. I substituted shorter bolts rather than additional washers.
Chris Madsen
Aerovee Sonex N256CM
Flying since September 2014
Build log: http://chrismadsen.org
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Re: Vertical Stab Aft Spar

Postby Bryan Cotton » Sun Feb 25, 2018 8:59 pm

I found Sonex tends to err on the long side for their hardware callouts. Not always but often.
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
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Re: Vertical Stab Aft Spar

Postby Area 51% » Mon Feb 26, 2018 8:58 am

I believe you should treat ALL of their hardware callouts as references, unless you're OK with adding 3lbs of washers to your plane.

Make notes on your plans for the next guy.
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Re: Vertical Stab Aft Spar

Postby pfhoeycfi » Sat Mar 03, 2018 4:20 pm

I've assemble my vert stab and noticed that the forward spar makes an angle of 57 degrees relative to the aft spar. This is a function of the pilot holes, rib length, etc in all of the components...it is what it is. The plans call for the forward spar fitting to be bent at an angle of 35 degrees...that means the larger flange part of the fitting is NOT parallel with the rear spar...it pitches back toward the rear spar 2 deg determined by math and measurement (35 + 57 = 92...not 90). My bent fitting is right on 35. Does this sound correct? I only have the tail plans and don't how this may or may not affect attachment in the future. Hope to order the rest this week w the sale. Please advise...
Peter
Doylestown, Pa
Peter Hoey
SEL Pvt, Comm Glider, CFIG, Pawnee & L19 Towpilot
Philadelphia Glider Council
Sonex B SNB0021, N561PH, Taildragger, Aerovee Turbo, MGL MX1, First flight Dec 18, 2022
Also built Sonerai IIL N86PH
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Posts: 377
Joined: Wed Jun 28, 2017 3:45 pm


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