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No mounting hole horseshoe backplate Empty No mounting hole horseshoe backplate

Post  Jason_WI on Sun May 03, 2020 1:55 pm

Scored my first no mounting hole horseshoe backplate. The Cox engine handbook mentions it and that very few were made. Doesn’t even have a picture of one. Top engine in the first pic. Pic 5 has a close up.

https://www.ebay.com/itm/153914791936

No mounting hole horseshoe backplate E4d9f810
No mounting hole horseshoe backplate 7943ad10
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Post  Levent Suberk on Sun May 03, 2020 2:28 pm

That mount plate is a part of Fokker Triplane, however I don't know how it can be mounted on model, perhaps it slides into a rail.

No mounting hole horseshoe backplate Img_2030
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Post  Marleysky on Sun May 03, 2020 5:11 pm

That’s a pretty cool find!! Good eyes there Jason! OK now ya gotta Print a mount for it!
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Post  Oldenginerod on Sun May 03, 2020 5:34 pm

I reckon I have one of those in my stuff. I'll have to dig it out. I seem to recall that it may have the two lower holes rather than none.
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Post  dckrsn on Sun May 03, 2020 6:58 pm

Good on you, Jason.
I remember discovering my first. Kinda goes
hand in hand with the postage stamp backplate
without the tabs on the sides.
Bob
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Post  roddie on Sun May 03, 2020 7:45 pm

I see that the Cox Fokker DR1 model's engine came with the protective steel tab that covered the engines' exhaust-port and had a mounting-flange that mirrored the crankcase gasket. I guess it was a later effort (following the mesh screen?) to prevent burns to the fingers whilst tuning the engine.

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No mounting hole horseshoe backplate Img_2010
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Post  dckrsn on Sun May 03, 2020 8:51 pm

Roddie, Cox actually made 3 different height deflectors. I
guess it had to do with exhaust porting, per the Daniels/Sitter
handbook. Huh... It took me a while to find the correct one for
a Spook restore.
Oh yeah, the "Radiator Clamp" deflector too.
Bob


Last edited by dckrsn on Mon May 04, 2020 5:17 pm; edited 1 time in total
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Post  Cribbs74 on Sun May 03, 2020 9:54 pm

Going to show my ignorance here, if it’s a Fokker engine how can it be rare? Was it changed somehow or was it just a short run in the Fokker.

Glad you got it though!
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Post  Jason_WI on Sun May 03, 2020 10:11 pm

6000 horseshoe backplates without mounting holes were made before switching to the version with holes. Not rare but hard to find. Kinda like windup drive plate engines.
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Post  Marleysky on Thu Oct 01, 2020 2:19 pm

Hey! Lookit was in the Ball jar of misc parts in my last purchase:



No mounting hole horseshoe backplate 3fd66a10

Backplate, heat shield, 128tpi needle!  Goodies!
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Post  dckrsn on Thu Oct 01, 2020 2:32 pm

Cool Beans! I always get a buzz from stumbling across something
I've heard about, but never seen.
Bob
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Post  KariFS on Thu Oct 01, 2020 2:34 pm

Oldenginerod wrote:I reckon I have one of those in my stuff.  I'll have to dig it out.  I seem to recall that it may have the two lower holes rather than none.

A two-hole backplate would fit on something like this:

No mounting hole horseshoe backplate 45e31310

Don’t remember anymore which plane this belongs to but found it interesting that it only had two screws and just a couple of plastic tabs to hold the top.
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Post  roddie on Thu Oct 01, 2020 7:11 pm

KariFS wrote:
Oldenginerod wrote:I reckon I have one of those in my stuff.  I'll have to dig it out.  I seem to recall that it may have the two lower holes rather than none.

A two-hole backplate would fit on something like this:

No mounting hole horseshoe backplate 45e31310

Don’t remember anymore which plane this belongs to but found it interesting that it only had two screws and just a couple of plastic tabs to hold the top.

Hi ya' Kari Smile My late 1980's vintage Cox PT19 has a similar lower-screws only arrangement with the horseshoe backplate fitting into upper-slots.

No mounting hole horseshoe backplate 1-11-110

sorry it's not a better image.. It's a rather ingenious multi-purpose firewall. The main landing gear-wire fits behind and is trapped by the back-plate; once it's installed. The whole assembly fit's up into the nose, held by rubber bands and is pitch-adjustable instantly for training-purposes.  Small Cox Logo

My Cox Cosmic Wind (also circa mid-late 1980's) uses no screws to hold it's .049 horseshoe-design back-plate/carb in place. Jason's no-mounting-hole back-plate would be a natural for it.

No mounting hole horseshoe backplate 12-20-10
No mounting hole horseshoe backplate 20190736

sadly.. my Cosmic-Wind has some wing-warp. I could try make a simple replacement-wing. It only has to fit the saddle at the fuse.. and have lead-out guides. The Cox OEM wing has the typical under-cambered airfoil. Neutral

No mounting hole horseshoe backplate 12-19-10

The airplane currently has an ExModel Engines "Black Lynx" high-performance .049 reed-valve engine installed.

No mounting hole horseshoe backplate 20181117
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Post  batjac on Fri Oct 02, 2020 12:40 am

Jason_WI wrote:6000 horseshoe backplates without mounting holes were made before switching to the version with holes. Not rare but hard to find. Kinda like windup drive plate engines.

Well, considering the total number of engines Cox produced, one could make the argument that only 6000 made would make it rare. How many product backplates total did Cox make in a month back in their heyday? 6K would be, what, a week's production?

The Rarefied Mark
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No mounting hole horseshoe backplate Empty Had @ blue similar one...

Post  happydad on Fri Oct 02, 2020 6:46 pm

batjac wrote:
Jason_WI wrote:6000 horseshoe backplates without mounting holes were made before switching to the version with holes. Not rare but hard to find. Kinda like windup drive plate engines.

Well, considering the total number of engines Cox produced, one could make the argument that only 6000 made would  make it rare.  How many product backplates total did Cox make in a month back in their heyday?  6K would be, what, a week's production?

The Rarefied Mark


Mark: I had a similar one that was blue, but had the pegs for the wing on the PT-19. Now I have a black one from a PT-19 late 1970’s.

The blue engine mount alone sold for $23.00. Someone wanted it bad.

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