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Post  Cribbs74 Wed May 20, 2015 9:16 pm

I have come across roughly 100 pkgs of CG postage stamp engine mounts.

Is this something anyone would be interested in? I would gladly grab some if anyone had a need for them.

Ron
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Post  gcb Wed May 20, 2015 9:27 pm

Cribbs74 wrote:I have come across roughly 100 pkgs of CG postage stamp engine mounts.

Is this something anyone would be interested in? I would gladly grab some if anyone had a need for them.

Ron

I could use two.

George
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Post  Cribbs74 Wed May 20, 2015 10:01 pm

I'll see what he wants for them. I didn't ask as I wasn't in the market.
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Post  Oldenginerod Wed May 20, 2015 10:24 pm

Cribbs74 wrote:I have come across roughly 100 pkgs of CG postage stamp engine mounts.

Is this something anyone would be interested in? I would gladly grab some if anyone had a need for them.

Ron

I'd be interested in a couple if you'd be willing to send to AUS.

Rod.
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Post  Marleysky Wed May 20, 2015 10:33 pm

Yes! I'd use a couple few of those. 2, 4 or 6. How expensive are they?
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Post  balogh Thu May 21, 2015 5:39 am

I could also use 2-3 but in Hungary...
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Post  KariFS Thu May 21, 2015 7:07 am

I would like a couple, maybe 3 also. Depends on the price of course. These might interest Cox International too?
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Post  Cribbs74 Thu May 21, 2015 8:33 am

I'll inquire about prices in the next couple days.
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Post  dckrsn Thu May 21, 2015 4:00 pm

Cribbs74 wrote:I'll inquire about prices in the next couple days.
I'd be interested in at least two Ron. Nice find.
Bob
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Post  Cribbs74 Tue May 26, 2015 4:54 pm

Guys,

Seems he wants me to pay what he has them listed on Ebay for. He claims that is what they sell for. I think that is a load of bologne and I don't wish to do business with him to be brutally honest.

He only has three listed on Ebay at the moment... None have sold.

He is asking $5 a piece for them his Ebay handle is: phpfeil

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Post  Oldenginerod Tue May 26, 2015 5:15 pm

Cribbs74 wrote:Guys,

Seems he wants me to pay what he has them listed on Ebay for.  He claims that is what they sell for. I think that is a load of bologne and I don't wish to do business with him to be brutally honest.

He only has three listed on Ebay at the moment... None have sold.

He is asking $5 a piece for them his Ebay handle is:  phpfeil

Would cost me $24.78 AUD each to go the ebay track.  I'm out DAMMIT!
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Post  dckrsn Tue May 26, 2015 5:29 pm

Cribbs74 wrote:Guys,
Seems he wants me to pay what he has them listed on Ebay for.  He claims that is what they sell for. I think that is a load of bologne and I don't wish to do business with him to be brutally honest.
He only has three listed on Ebay at the moment... None have sold.
He is asking $5 a piece for them his Ebay handle is:  phpfeil
I can't blame you, Ron.
Screw him. Let him sit on them forever.
Thanks for thinking of us though.
Bob
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Post  roddie Tue May 26, 2015 8:18 pm

dckrsn wrote:
Cribbs74 wrote:Guys,
Seems he wants me to pay what he has them listed on Ebay for.  He claims that is what they sell for. I think that is a load of bologne and I don't wish to do business with him to be brutally honest.
He only has three listed on Ebay at the moment... None have sold.
He is asking $5 a piece for them his Ebay handle is:  phpfeil
I can't blame you, Ron.
Screw him. Let him sit on them forever.
Thanks for thinking of us though.
Bob

Roddie still has mounts.. (2-piece alum. plate design).. although Eric (getback) reported a stress-failure on a bend in one of his mounts that I sent him last year. I mailed-out a few sets to CEF members.. but Eric is the only one to report testing. The failure could have been caused by the way I bent the angles in the brackets.. or the angle/speed at which the engine struck the ground.. Laughing (The FAA report was vague..) Postage to AU would be cheap.. if I don't bend the two opposing 90 degree angles required.. (they could mail flat in an envelope) You interested Rod? Anyone?
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Post  Oldenginerod Wed May 27, 2015 6:26 am

I have one of the CG mount kits N.I.P. Like the guy selling them, my balloon was toast but I've never tried a bladder fuel system so that didn't bother me. I have several postage stamp engines but don't have any particular plans for something to mount one on, so I don't have any real desire for any of your mounts Roddie. Sure I could knock something up myself if needed, but if I end up with a plane to use the CG mount on, that's what I'll do. My current build has taken over a year and the previous one took about 18 months, so I'm in no hurry. I have four new 1/2A kits in boxes, so at my rate, I'm set for the next decade.

Rod.
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Post  KariFS Wed May 27, 2015 8:26 am

Thanks for the kind offer Roddie, I only have two postage stamp engines and a bunch of tanked and horseshoe engines so, like Rod, I am pretty much set for a while too. Maybe, if they have the fine thread needles, and I want to play with pressure feed, I'll actually use them.

I do reserve the right to steal your design when I see fit lol!

Actually the CG mount looks pretty flimsy, not worth 5 dollars to me.

If/when I get a "Roddie-style" mount done, I'll report for sure.
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Post  roddie Wed May 27, 2015 10:17 pm

KariFS wrote:Thanks for the kind offer Roddie, I only have two postage stamp engines and a bunch of tanked and horseshoe engines so, like Rod, I am pretty much set for a while too. Maybe, if they have the fine thread needles, and I want to play with pressure feed, I'll actually use them.

I do reserve the right to steal your design when I see fit lol!

Actually the CG mount looks pretty flimsy, not worth 5 dollars to me.

If/when I get a "Roddie-style" mount done, I'll report for sure.

Kari, somewhere here.. (possibly in my mount thread).. there's a discussion on bending metal plate. I bent the mounts/brackets (.060" 1060 Aluminum) cold; in a slotted fixture clamped in a vise using a plastic-headed hammer and a small square aluminum block to square-off the 90 degree bends. This technique could have formed stress-fractures along the bend-line. The jaws in the fixture had sharp corners.

CG postage stamp mounts. 8-26-110
CG postage stamp mounts. 8-26-111
CG postage stamp mounts. 8-26-112

Perhaps rounding the jaws could have formed a less-sharp stress-corner to the joint. I may try that. This design does require a lengthened firewall.

CG postage stamp mounts. 5-27-110

My 1/2A Voo Doo (Phred's Phault) will use it horizontally on a 1/4" plywood firewall inset into its foam-wing. Mine is a narrower mount system; compared to a Bee engines'.. but comparable in length. Not so difficult to modify a traditional "Bee-mounting" on a profile-design; to use thinner/taller cheek-blocks.. and a more vertically-rectangular firewall. The firewall-mount pattern width (vertically) is actually the same as the 17/32" crankcase mount dimension.. and would fair-in much sleeker on a profile model, than a tanked-engine would.

These back-plates should not languish-away in a spare-parts bin. They were made in the beginning.. when Cox was making their mark on the hobby. Any reedy deserves to sport one!
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Post  getback Thu May 28, 2015 8:24 am

Roddie if you decide to smooth those edges for a better bend , I am willing to put it to the test for you I have quite a few PS engines , up to you brother. Huh...
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Post  roddie Thu May 28, 2015 9:39 pm

getback wrote:Roddie if you decide to smooth those edges for a better bend , I am willing to put it to the test for you I have quite a few PS engines , up to you brother. Huh...  

I'm getting ready to mail some stuff out to a few members. I'll send you some more mounts Eric. I've been meaning to do that since last winter.. Embarassed  When I was originally bending the mounts.. I was starting the bend by hand cold.. using my fingers to push the first 45 degrees of the 90.. followed by hammer-tapping; using an aluminum block to finish.

These first (prototype) mounts were bent in a slotted-block of PVC. The "counters" wore-down quickly with successive bends..

CG postage stamp mounts. 8-23-110
CG postage stamp mounts. 8-26-113

So.. I machined a wider slot in the PVC block to accept jaw-plates for repeatability.

CG postage stamp mounts. 8-26-114
CG postage stamp mounts. 8-26-115

I don't know how much this stresses the bend-points. Maybe a combination of smoothing the fixture-jaws and pre-heating the mounts, just prior to bending the angles.. would produce a more solid mount? I will try it before sending any more. I will also send you some unbent blanks. You could use those for the "290 Special" model.. should you choose to build it.. or something with a similar firewall construction.

CG postage stamp mounts. 290_sp10
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Post  Ken Cook Fri May 29, 2015 4:15 am

Roddie, do you know what kind of aluminum you have? I feel the cracking is going to be a constant. The aluminum probably already is tempered and your furthering the hardening by bending it. I had T-6 6061 do this many times in my search for a landing gear material. In order to stop the breaking, I had to really flare out the bends and not even think about putting a crease in the material. Repeated bendings caused an immediate failure on those creases. Ken
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Post  Davenz13 Fri May 29, 2015 6:44 am

How would it be if the mount was just a flat plate with the eight holes (inner four for the engine, outer four for the firewall mount) with a piece of square section alloy bar down each side with corresponding holes for the outer mounting screws giving the same spacing as the fold did. It would give exactly the same mounting pattern and depth without the fold. If more depth was needed use thicker section bar. The outer screws would be a fraction longer but if weight was to become an issue plastic could be used instead of the alloy bar. We use an industrial plastic as crash protectors on the race bikes, light, hard and extremely tough. Maybe I’m off track here but just a thought.
Dave  

CG postage stamp mounts. Postag10
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Post  getback Fri May 29, 2015 11:56 am

OK Roddie , sounds great yes some blanks too I have some kind of aluminum here but cant recall how thick it is ? Thanks ,Eric Babe Bee .049
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Post  Michpatriot Tue Jan 24, 2023 9:33 pm

I'd really like to find some of these Carl Goldberg mounts..
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Post  batjac Tue Jan 24, 2023 9:41 pm

Something that just occurred to me that for some reason I never thought about before. The C.G. postage stamp mount came with a balloon tank, obviously no good at this point. But, most postage stamp engines that I've found or heard about have fine needle valve assemblies in them. That means that instead of a balloon, they would be very good for a bladder setup.

The Oblivious Mark
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