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Carl Goldberg mounts for red postage stamp backplate reedies

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Post  balogh Sat Jan 01, 2022 10:38 am

A rare auction here:

https://www.ebay.com/itm/Lot-of-16-RC-Airplane-Part-Packs-Carl-Goldberg-Engine-Mount-for-Cox-260-NIP-/373841086412?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0

16 pcs are just too many for me, but if we could form a bidding pool, I would definitely buy at least 4 of them. A US CEF member could be the prime bidder and re-sell some with handling and shipping fee added to others interested.

Would anyone volunteer to bid and arrange for the subsequent re- selling among CEF members? I would be glad to do but belonging to the distant, non US resident CEF minorities, I do not qualify for an economical distribution hub.
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Post  Cribbs74 Sat Jan 01, 2022 1:07 pm

Might be a tall order. Especially since Jason 3D printed a bunch of pieces that are much more robust than the CG originals.

How many do you need? I have some I am not using and have no future plans. I could spare a couple.

Ron
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Post  944_Jim Sat Jan 01, 2022 1:10 pm

Balogh,
I have no interest in these, but if you pull off a neat trick, I'll make sure to get a Dubro clip to "the stateside distribution point." Feel free to hit me up if you gain traction in your quest. Until then, I will try to find a way to get the clip to you.
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Post  balogh Sat Jan 01, 2022 1:54 pm

Ron, Jim,


Thanks for your generous offers.


I got a few 3D courtesy pieces from Jason Wi and also bought from Bernie some 3D printed mounts that Jason Wi produced, but I saw that the last pieces were sold out by Bernie some time ago, so I thought Jason's production run has been over.

My 3D units have been partly utilized but some also snapped...I boiled others in hot water in hopes they will soften up like the black COX props..

International shipments are unreliable during Covid times (it has been almost a month I have been waiting for Dick Russ' 1/2A Streaker to arrive here from Oklahoma, with no sign of its whereabouts whatsoever..in pre-Covid times it took 9days for Bernie to ship here from Canada or Matt to ship from US)  and I thought if someone on CEF volunteers to stock the 16 from ebay then later when Covid shipping miseries are over I could buy some from that stock...
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Post  Jason_WI Sat Jan 01, 2022 9:51 pm

I can try printing out of glass fiber and carbon fiber zytel. Standard zytel is brittle just off the printer. I do boil them to anneal them but that may not be enough as they will dry out again in arid environments.

Not sure I can add much more thickness anywhere without it fitting like the CG molded one. Where do these tend to break?

Carl Goldberg mounts for red postage stamp backplate reedies Cg_mou10
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Post  balogh Sun Jan 02, 2022 1:41 am

Thanks Jason, they mostly break where the thin plate intersects the thicker bracket. Some break already under the torque when the spring starter is wound clockwise, some later due to engine vibration. Some were cured well with boiling.

Maybe with a bit wider slot for the spraybar up and down you could afford a bit thicker plate with glass fiber?

Carl Goldberg mounts for red postage stamp backplate reedies 16411010
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Post  cstatman Sun Jan 02, 2022 3:47 pm

im good for 2, but not all of em...
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Post  balogh Sun Jan 02, 2022 3:53 pm

I could volunteer to buy the pack of 16 but a 27% Value Added Tax plus import duty is added in Hungary...plus I am not sure how long it takes to ship here...so someone in the US should better buy the package and resell it to whoever are interested on CEF in smaller lots. I am in for 3 or 4. The auction ends in a few hours though. The Goldberg mounts are rarities nowadays and I would regret to see this opportunity go...
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Post  Oldenginerod Sun Jan 02, 2022 5:39 pm

Same problem here. By the time they're shipped out here and are taxed they'd end up too expensive for most at what I'd need to sell/ship them for.
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Post  KariFS Mon Jan 03, 2022 12:42 am

@Jason_WI wrote:I can try printing out of glass fiber and carbon fiber zytel. Standard zytel is brittle just off the printer. I do boil them to anneal them but that may not be enough as they will dry out again in arid environments.

Not sure I can add much more thickness anywhere without it fitting like the CG molded one. Where do these tend to break?

Carl Goldberg mounts for red postage stamp backplate reedies Cg_mou10

Jason, do you think you could form a ”chamfer” into the inside corners between the thin part that faces the engine backplate and the thicker part that works as a spacer? Maybe between the triangular part and spacer part too?

Sometimes sudden changes in thickness of a structure cause stress concentrations, that combined with the vibration... A chamfer (not sure if it’s a correct term for the round ”fillet” shape that I mean) would spread the stress over a larger area.

Not sure if I could explain this in a way anyone understands, but imagine it being steel, about 20x the size and with a nice thick continuous weld seam done by a pro into all the inside corners of the part lol!
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Post  balogh Mon Jan 03, 2022 12:50 am

Kari,  yes this is what is called "stress relief by smooth transition " in stress analysis. I was also trying to add that chamfer or fillet from CA glue to relieve the stress, but CA does not adhere well to the material of the mount.
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