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Building Tips and technical articles. => Building techniques => Topic started by: Bootlegger on August 07, 2018, 04:41:30 PM
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Guy's what way have you found best to mount the bell crank in a foam wing, and please be specific, I need all the help that I can get..
and THANK'S...It will be suspended between upper and lower b/c mounts...
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https://stunthanger.com/smf/open-forum/how-do-you-mount-belcrank-in-a-foam-wing-core/msg388732/#msg388732 (https://stunthanger.com/smf/open-forum/how-do-you-mount-belcrank-in-a-foam-wing-core/msg388732/#msg388732)
Reply #7 answers all your questions, plus the ones you forgot to ask.
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litle different solution
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then the glass goes over the all and joins all together
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Igor, that bellcrank is a work of art. I assume from the soldering that it's steel with brass tubing soldered on. Is the body plain steel or some fancy hard steel? How much does it weigh?
Interesting use of ball joints, BTW :).
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It is steel used for car caroseries, so standard, not hardened, not plated, but high tensile, not soft.
BTW I do not use ball bearings, it is standard bent pushrod from welding wire in brass tube bearing.
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https://stunthanger.com/smf/open-forum/how-do-you-mount-belcrank-in-a-foam-wing-core/msg388732/#msg388732 (https://stunthanger.com/smf/open-forum/how-do-you-mount-belcrank-in-a-foam-wing-core/msg388732/#msg388732)
Reply #7 answers all your questions, plus the ones you forgot to ask.
Okay, forgive the obtuse question. If the wing and fuselage are built separately, you have to cut a slot in the fuselage to clear the top and bottom of te pins when you slide the wing in place. Looking at the photos of Bob's plane, I don't see how he did that. The fuselage and ply doubler look intact. How did he do it?
Mark
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Slid the fuse sides onto the wing separately (from each tip) then built the fuse jigged to the wing on his bench?
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It is steel used for car caroseries, so standard, not hardened, not plated, but high tensile, not soft.
I usually understand Igor just fine, but "car caroseries" has me puzzled. ??? Steve
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body bodywork chassis frame coachwork (of a car ) car body
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"Not hardened but high tensile" sounds like a bit of an oxymoron to me -- but car body steel is weird stuff these days. It comes out of the mill soft, and age hardens. The idea is that it's soft for the punching process, and then hardens itself by the time the car gets out of the factory. That way you can have a strong, lightweight car body without having to even think of heat-treating sheet metal (which would be nuts).
I don't know where you'd get flat pieces of the stuff -- steal the tailgate off of Helmick's truck, maybe. There should be several bellcranks in that.
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My solution is:
https://plus.google.com/photos/117790355930193335731/album/5715088163776972593/5715089616610138770
Can it be more simple? :)
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Okay, forgive the obtuse question. If the wing and fuselage are built separately, you have to cut a slot in the fuselage to clear the top and bottom of te pins when you slide the wing in place. Looking at the photos of Bob's plane, I don't see how he did that. The fuselage and ply doubler look intact. How did he do it?
Mark
The very worst part of that question is that you made me realize that I have this beautiful fuselage, and this beautiful wing with the bellcrank axle sticking about 1/2" from the top & bottom. The project has been idle for a couple of years so I can't remember my plans, but I think I'll take a Dremel Dangerous Disk and whack the axle down so it's sticking out about 1/8", and then just notch the wing opening on one side. That'll be easily covered by the wing fillet, so everything should be just fine.
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"Not hardened but high tensile" sounds like a bit of an oxymoron to me -- but car body steel is weird stuff these days. It comes out of the mill soft, and age hardens. The idea is that it's soft for the punching process, and then hardens itself by the time the car gets out of the factory. That way you can have a strong, lightweight car body without having to even think of heat-treating sheet metal (which would be nuts).
It is material for cold molding of car body - especially that which must surive and to break during molding process and also during crash (must bend, not break, but still must be strong and not heavy)
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Bob, thank you very much for the description and the photos. It is clearer now. I hope to one day be able to build close to your level. I have a set of foam wings in the corner that I need to build a fuselage for, and this will help greatly.
Thanks,
Mark