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#11
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Where do main pin holes come from?
On Nov 1, 6:59*pm, wrote:
On Nov 1, 8:10*pm, Bob Kuykendall wrote: On Nov 1, 4:44*pm, Martin wrote: That's a good way to make a one-off homebuilt. In production, they use a jig to make sure the parts are interchangeable. Yes, interchangability is a definite concern. But I didn't want to invest mondo dollars in locking down all of the interfaces until we'd finished one ship and made sure it all works. The tooling that I did build to ensure interchangability at the lift pin interfaces is shown in this Update on my Web site: http://www.hpaircraft.com/hp-24/update_1b_nov_10.htm It is similar in function to that used by Jonkers, except that as you observe it does not embody the locations of the main pin bores. Also, as I understand it, a lot of European ships aren't really all that interchangable. In fact, I don't know of a factory that would send you an entire brand new wing and guarantee that it would mount right up to an existing fuselage and opposite wing without at least some drilling or adjustment. What I've heard and read is that if you need to replace an entire wing they want to handle the fitment either at the factory or at their authorized service shop. And what they'll probably do there is either start with a blank spar stub and match-drill it to the good wing, or go ahead and bore out the bushings in the good wing and match drill and re-bush both of them together. And either of those techniques would guarantee "interchangability" for the ship at hand. Thanks, Bob K. I put 2 wings together on an ASW-19 which were 100 serial numbers apart and the only thing I had to do was shim the lift pins. But it don't always go that way. Answer to your question is that those holes come from the wing pin hole fairy. What an easy question. UH those fairy's are really boring too........... Brad |
#12
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Where do main pin holes come from?
On 11/1/2010 7:10 PM, Darryl Ramm wrote:
On Nov 1, 4:15 pm, Greg wrote: On 11/1/2010 4:07 PM, Bob Kuykendall wrote: Where do those big holes in the spars of composite gliders come from? You know, the ones where they put the bushings that you insert the main pins through? Somebody with a big drill drills them. http://www.youtube.com/watch?v=FZ3rISscO2I Thanks, Bob K. http://www.hpaircraft.com/hp-24 Interesting to compare your technique with the way it is done at Jonker Sailplanes: http://www.jonkersailplanes.com/factorypictures8.htm Impressive looking jig, but it also looks like they are using filter respirators for what they are spraying the wings with, which looks like a topcoat. Wonder what they are spraying... Polyurethane, it says. One hopes that in their new paint booth they have a healthier system. Darryl |
#13
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Where do main pin holes come from?
I have replaced a wing on; Libelle, K-21, ASW-20 and G-103. The only
one that fit without re-bushing was the Grob because their fittings are jig set and the aft lift pin can move laterally. On the K-21 we re- set only one bushing and held the wings in place with both main wing pins inserted..................rotated them every 15 minutes to insure they would come out when dry! Looking good Bob, did you glue in an uncut bushing and then cut the wings apart after the epoxy set? JJ |
#14
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Where do main pin holes come from?
On Nov 2, 6:33*am, JJ Sinclair wrote:
*...Looking good Bob, did you glue in an uncut bushing and then cut the wings apart after the epoxy set? Thanks, JJ! No, we inserted our bushings in pairs with the separation lines between the spars. It did get a bit of epoxy between the pin and the bushing, and the first removal was a bit hard. But after cleaning the pins and bushings with acetone and re-lubing them, the pins slid straight in. Bob K. |
#15
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Where do main pin holes come from?
On Nov 1, 6:08*pm, Martin wrote:
Btw, those two seat jet trainers at Mojave look like Impalas. *They are Aermacchi MB-326 built under license in South Africa. *The National Test Pilot School operates a few of them. Yes, that looks exactly right! Thank you! Here's the Wikipedia page: http://en.wikipedia.org/wiki/Aermacchi_MB-326 Bob K. |
#16
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Where do main pin holes come from?
On Mon, 1 Nov 2010 18:59:20 -0700 (PDT), wrote:
[snip] Answer to your question is that those holes come from the wing pin hole fairy. What an easy question. Dang! I thought it was done with explosives. rj |
#17
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Where do main pin holes come from?
On Nov 2, 8:28*am, Ralph Jones wrote:
Dang! I thought it was done with explosives. The stuff I used for the bearing blocks in the spar where the pins go is tough freakin' stuff, and made a mess of just about every sort of drill bit we threw at it. So, yeah, we did toss around the idea of det cord or shaped charges. But sanity prevailed in the end. Thanks, Bob K. |
#18
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Where do main pin holes come from?
On Nov 2, 3:57*pm, Bob Kuykendall wrote:
On Nov 2, 8:28*am, Ralph Jones wrote: Dang! I thought it was done with explosives. The stuff I used for the bearing blocks in the spar where the pins go is tough freakin' stuff, and made a mess of just about every sort of drill bit we threw at it. So, yeah, we did toss around the idea of det cord or shaped charges. But sanity prevailed in the end. Thanks, Bob K. the landlord nixed the idea of using explosives.............I better stop before echelon gets me! Brad |
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