Postage stamp backplate mount?

nitroairplane Tue Dec 27, 2011 3:54 pm

http://www.ebay.de/itm/Cox-Motortrager-Babe-Bee-cm-unbenutzt-OVP-Nr-1627-/160705353712?pt=RC_Modellbau&hash=item256ac917f0#ht_500wt_1204
It looks like it.

**Cribbs74** Tue Dec 27, 2011 4:05 pm

Yep, looks exactly like the one I have. Works well.

nitroairplane Tue Dec 27, 2011 4:09 pm

Okay I may have to bid Smile

Don't ask what i was doing on German eBay Smile

mr_cox Tue Dec 27, 2011 4:16 pm

How do you use it?

nitroairplane Tue Dec 27, 2011 4:23 pm

mr_cox wrote:How do you use it?

you know that postage stamp backplates do not have screw mounts?
Yeah this uses crankcase crews to add a set of mounts to the engine.

Surfer_kris Tue Dec 27, 2011 4:24 pm

Lots of good stuff on the german bay, not many of them accept paypal though...

nitroairplane Tue Dec 27, 2011 4:28 pm

Yeah a lot of great stuff.
When I want translation I just call on our resident German speaker Smile

GermanBeez Smile

GermanBeez Tue Dec 27, 2011 4:32 pm

yes, do so lol Very Happy

nitroairplane Tue Dec 27, 2011 4:38 pm

Okay tell me what he says about it.

Jaspur_x Thu Dec 29, 2011 3:38 am

I`m going to make mine out of aluminum for weight savings,I like the postage stamp backplates.

nitroairplane Thu Dec 29, 2011 5:24 am

What is it your like about them?

Jaspur_x Thu Dec 29, 2011 6:07 am

I guess because they are less common and are compact compared to some others........and can be throttled with my mount Tired w/ Coffee Read

,experiments forthcoming

But my other mounts will be even nicer lol!

nitroairplane Thu Dec 29, 2011 6:09 am

Jaspur_x wrote:I guess because they are less common and are compact compared to some others........and can be throttled with my mount ,experiments forthcoming

But my other mounts will be even nicer

Cool and I suppose yeah they can fit in smaller airframes.

astronomer1 Thu Dec 29, 2011 9:05 am

Didn't Goldberg make an aftermarket Postage Stamp motor mount? Does anyone have any type Postage Stamp mount that they would like to part with? I have two PS Backplates that I have been wanting to do some experimenting with concerning drilling intake opening for enhanced performance. cheers

for the New Year!!!

nitroairplane Thu Dec 29, 2011 9:08 am

Yes look at t the first post it is a link to own on eBay . De

astronomer1 Thu Dec 29, 2011 10:23 am

The Ebay postage stamp motor mount shown, is I believe a Graupner product. I think the Goldberg aftermarket mount was made of sheetmetal and was probably stronger. The linked German listing is not available in the U.S. Have never seen a real cox one.
If I can't get a hold of a real mount after market or not, I may fabricate one out of .o20" alum.

Big Al Thu Dec 29, 2011 2:29 pm

The Graupner mount looks almost identical to the Goldberg. At least from the photo, I have never actually seen a Graupner mount. Here is a Goldberg on a Babe Bee (modified for crankcase pressure). At one time they were cheap and plentiful.
Al

Postage stamp backplate mount? Reed-p10

dckrsn Thu Dec 29, 2011 3:39 pm

nitroairplane wrote:What is it your like about them?

Imho, the best feature is the 128 thread per inch needle assembly.
Head and shoulders above the standard one. Wink

The Goldberg postage stamp mount came packaged with a balloon
bladder tank, 2 short pieces of fuel tube and a rubber band.
Good way to utilize an engine after the plastic plane
has crashed for the last time.
Bolt/screw hole pattern is the same as the reedie backplates, but horizontal-sideways.
Big Al's picture(above post) shows this better.

Bob

Postage stamp backplate mount? 00113

WingingIt74 Mon Mar 26, 2012 10:42 am

Jaspur_x wrote:I`m going to make mine out of aluminum for weight savings,I like the postage stamp backplates.

Jaspur, did you ever make one?

roddie Fri Nov 27, 2015 8:02 pm

It's been a while since anyone's mentioned running a postage stamp back-plate.. and I know that there's a lot of us who have at least one kicking around in a box somewhere. I noticed tonight that Cox International stocks "what I think" are the necessary parts to assemble a complete postage-stamp "back-end".

The back-plate w/spray-bar..

Postage stamp backplate mount? 049_ba10

The fine-thread needle..

Postage stamp backplate mount? 6189_n10

and an overhaul-kit with the necessary shorter 2-56 crankcase screws..

Postage stamp backplate mount? 049_ov10

This arrangement wasn't very popular after the production-model it was designed for was broken.. because it could not be mounted in a conventional way, in another model. The Cox Babe Bee reed-valve engine was readily available separately.. with integral tank and easy firewall mounting.. and these 190 product engines were either discarded.. or used for spare-parts. Sad... because they had a fine-thread needle, which offered much finer tuning and is essential for using a pressure-bladder. You can still find aftermarket mounts on ebay though. Carl Goldberg made them years ago.. as well as other firms.

I made my own 2-piece sheet-aluminum mounts on a CNC machine about a year ago.. and still have some. Eric (Getback) tried a set.. but experienced a stress-fracture on a bend-point on one of the mounts after a few flights. It may have been an isolated incident. I mailed out a few sets to others.. but didn't get any feedback.

coxaddict Sat Nov 28, 2015 4:20 am

This is my experiment with the postage stamp type mount. it is machined from 1 inch aluminum square tubing. The bolt pattern for the mount is the same as the tanked Bees. After all this I found that I have about half a dozen or more of the white and some red horseshoe backplates with the fine thread needle. So using this mount is moot unless it is used on a plane that has a tanked Bee bolt pattern on the firewall. I might try it with a bladder set up.

'addict
Postage stamp backplate mount? 00510

Ken Cook Sat Nov 28, 2015 6:07 am

I think your mount is nicely configured. I tried bending up a two part mount using 6061 T-6 and while it did work, it cracked on the radius. Seeing that your tubing is extruded, I don't feel that would be an issue. Very cool. Ken

KariFS Sat Nov 28, 2015 6:59 am

Oh yes that's a cool mount, addict!

I was thinking of using pieces of aluminum bar that I'd drill and mill (I wish) or file in such a profile that they would fit to the backplate and extend above or to the sides of the backplate and the extending parts would have the mounting bolt holes. Kinda like the ones Roddie made but from a solid billet instead of bending to avoid the stress fractures. Never got enough round-toits gathered to do that.

I like your solution, very well thought of Thumbs Up

coxaddict Sat Nov 28, 2015 10:02 am

Thanks guys,
After all the planning and work, I found that I don't need the mounts at this time. If any one wants one, PM me. I have 2 to send away.
Cheers

coxaddict Sat Nov 28, 2015 10:14 am

These mounts also act as a girdle to help seal the plastic backplate, which is prone to warping and leaking in air.

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