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Thread: Platinum Pacer Wings

  1. #271
    mmoyle's Avatar
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    Default Re: Platinum Pacer Wings

    Yeah...that was fun! The tedious part was centering the #40 drill bit at each punch mark on the drill press for the first 300+ drill holes in the first flat bar..then match drill the second flat bar with a cordless, then drill the spar through both plates.....then another 300+ holes at 1/8”...1200+ drill holes. Deburred after each drill size........My fubar’d right hand felt wonderful after all that.


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  2. #272
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    Default Re: Platinum Pacer Wings

    Little something done. Milled 3/8” by 1” aluminum flat bar to .345” thick to maintain proper rear wing strut mount spacing.


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  3. #273
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    Default Re: Platinum Pacer Wings

    Tank bay false spar version 2.0 Didn’t like the flush rivet results from the first go-a-round.. part of the problem was the .014” to .016” thick false spar material. Decided to use Dakota Cub false spar material...it’s.020” thick. Use flush stainless cherry pull rivets. Final results much better.


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  4. #274
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    Default Re: Platinum Pacer Wings

    Mark,

    always best to dip those pull rivets in just a taste of proseal or other polysulfide sealant before pushing them into the hole and pulling.

    Working out your hand might be the best thing for it?

  5. #275
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    Default Re: Platinum Pacer Wings

    Quote Originally Posted by mmoyle View Post
    I can’t say what the numbers are....the bending load on the rear spar is increased due to the additional leverage exerted on the rear spar inboard of the wing strut attach point by the outboard end of aileron being moved out to 160”....which is the same distance as the outer radius of the wing tip bow. When Eddie and I talked about the thickness of the spar reinforcement I thought .050” or .063” 2024T3 on both sides of the spar would have been sufficient. Eddie wanted 1/8”. Maybe his DER made that recommendation?

    You’re not the only person that has asked me this... I’m tempted to buy the aeronautical engineering books to learn this stuff.. I can easily calculate bending loads on steel and aluminum if the dimensions are nominal or listed in one of my mechanical engineering books.... but this aircraft engineering stuff is beyond me.. I don’t have a good grasp of how air pressure acts at a given speed to calculate force or weight on the structure... I’m hoping Eddie’s DER can get his STC done...

    If it doesn’t happen my fall back is to generate Cad drawings in Cadkey, send the drawings to a Boeing Engineer who owes an attorney friend in Stockton Ca...who gifted that debt to me... That attorney being Marc Bourget who I believe owns the Thorp experimental. Marc was partnered with John Thorp. Anyway...I’ve spoke with the Boeing engineer a few times...


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    For load calculations the weight increase is multiplied by maximum g loads 3.8. I agree with you that .125 is massive and overkill. The Bushmaster uses .50 reinforcing plates (44 inches long) as does the approved Piper splice. Also, Bushmaster's original straight plates were later modified to contoured adding more material at the top and bottom of the rib which saved weight and increased strength when they went to 2100 lb GW. When I was engineering a similar mod to Trimmer's the wing was stiffened at the leading edge and with extruded 1/2 inch angle aluminum at the top and bottom spar around the strut attachment. The rear spar is most critical. This brings back memories of last winter bucking hundreds of AD rivets in my spar.

    It sounds like Eddie is still designing this STC. Are you his test platform?
    Last edited by Stephen; 01-23-2018 at 05:48 AM.
    "You can only tie the record for flying low."

  6. #276
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    Default Re: Platinum Pacer Wings

    Quote Originally Posted by rocket View Post
    Mark,

    always best to dip those pull rivets in just a taste of proseal or other polysulfide sealant before pushing them into the hole and pulling.

    Working out your hand might be the best thing for it?
    Yeah...pushing the hand....gets frustrating at times..pinky likes to hump the ring finger.. will wait until next fall to get that corrected..should have good bone density by then for the surgeon to get it right.
    Why use the sealant? Dissimilar metals or preventing something?


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  7. #277
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    Default Re: Platinum Pacer Wings

    Quote Originally Posted by Stephen View Post
    For load calculations the weight increase is multiplied by maximum g loads 3.8. I agree with you that .125 is massive and overkill. The Bushmaster uses .50 reinforcing plates (44 inches long) as does the approved Piper splice. Also, Bushmaster's original straight plates were later modified to contoured adding more material at the top and bottom of the rib which saved weight and increased strength when they went to 2100 lb GW. When I was engineering a similar mod to Trimmer's the wing was stiffened at the leading edge and with extruded 1/2 inch angle aluminum at the top and bottom spar around the strut attachment. The rear spar is most critical. This brings back memories of last winter bucking hundreds of AD rivets in my spar.

    It sounds like Eddie is still designing this STC. Are you his test platform?
    Eddie hasn’t mention using my Pacer as a test platform. Testing was supposed to take place last fall. Will ask him the next time we flip each other err stuff.


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  8. #278
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    Default Re: Platinum Pacer Wings

    Mark,
    Dipping pull rivers was SOP for Boiing and MD when I played with them, ditto Bell choppers. Guessing for all the usual reasons. Don't worry that you didn't but they are less likely to smoke or drop the center and of course the corrosion proofing always is a plus if you have chromated polysulfide


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  9. #279
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    Default Platinum Pacer Wings

    Wee bit of progress. Flap and Aileron hinges fit and riveted to the false spar...should have waited to secure the trailing edge of the aileron...washout matches/aligns perfectly with the wing tip...cept...see picture. Ran the wires for the wing tip Nav/strobe light. 14 ga wire for the land/taxi lights...ground next. IS there any reason to run another wire/s...like say installing a magnetometer for a future wizbang instrument upgrade...a Garmin or Aspen like multi-function display. Tomorrow build the stall fence mount and stall fence.


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  10. #280
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    Default Re: Platinum Pacer Wings

    Question: I’m installing PA18 flap gap seals. Needed to open up the angle a bit, then use the leaf brake make it fit to the concave surface of the false spar. I’d like to permanently install....after painting the internal/hidden surfaces (false spar and gap seal) to prevent corrosion....I’d like cover the wing with the flap gap seal installed.


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