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Author Topic: mounting b/c in foam wing..  (Read 5022 times)

Offline Bootlegger

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mounting b/c in foam wing..
« on: August 07, 2018, 04:41:30 PM »
  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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Offline Tim Wescott

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Re: mounting b/c in foam wing..
« Reply #1 on: August 07, 2018, 06:24:22 PM »
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Offline Igor Burger

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Re: mounting b/c in foam wing..
« Reply #2 on: August 07, 2018, 10:46:37 PM »
litle different solution
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Offline Igor Burger

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Re: mounting b/c in foam wing..
« Reply #3 on: August 07, 2018, 10:47:38 PM »
then the glass goes over the all and joins all together
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Offline Tim Wescott

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Re: mounting b/c in foam wing..
« Reply #4 on: August 08, 2018, 12:54:17 PM »
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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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Igor Burger

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Re: mounting b/c in foam wing..
« Reply #5 on: August 08, 2018, 01:21:45 PM »
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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Offline Mark Mc

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Re: mounting b/c in foam wing..
« Reply #6 on: August 08, 2018, 04:56:20 PM »
Quote from: Tim Wescott on August 07, 2018, 06:24:22 PM
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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Offline Target

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Re: mounting b/c in foam wing..
« Reply #7 on: August 08, 2018, 09:34:29 PM »
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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Offline Steve Helmick

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Re: mounting b/c in foam wing..
« Reply #8 on: August 10, 2018, 08:01:41 PM »
Quote from: Igor Burger on August 08, 2018, 01:21:45 PM
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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Offline Mike Haverly

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Re: mounting b/c in foam wing..
« Reply #9 on: August 11, 2018, 12:07:39 PM »

body bodywork chassis frame coachwork (of a car ) car body
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Offline Tim Wescott

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Re: mounting b/c in foam wing..
« Reply #10 on: August 11, 2018, 01:04:51 PM »
"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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Offline Istvan Travnik

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Re: mounting b/c in foam wing..
« Reply #11 on: August 11, 2018, 03:57:08 PM »
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Offline Tim Wescott

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Re: mounting b/c in foam wing..
« Reply #12 on: August 11, 2018, 05:24:09 PM »
Quote from: Mark Mc on August 08, 2018, 04:56:20 PM
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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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Igor Burger

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Re: mounting b/c in foam wing..
« Reply #13 on: August 11, 2018, 10:39:15 PM »
Quote from: Tim Wescott on August 11, 2018, 01:04:51 PM
"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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Offline Mark Mc

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Re: mounting b/c in foam wing..
« Reply #14 on: August 12, 2018, 05:03:20 PM »
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
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