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Cox Engine of The Month
No mounting hole horseshoe backplate
Page 1 of 1
No mounting hole horseshoe backplate
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


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


Jason_WI- Top Poster
Posts : 3074
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Levent Suberk- Platinum Member
- Posts : 1186
Join date : 2017-12-24
Location : Turkey
Re: No mounting hole horseshoe backplate
That’s a pretty cool find!! Good eyes there Jason! OK now ya gotta Print a mount for it!
Marleysky- Diamond Member
Posts : 2868
Join date : 2014-09-28
Age : 68
Location : Grand Rapids, MI
Re: No mounting hole horseshoe backplate
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.
Oldenginerod- Top Poster
- Posts : 3285
Join date : 2012-06-15
Age : 58
Location : Victoria, Australia
Re: No mounting hole horseshoe backplate
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
I remember discovering my first. Kinda goes
hand in hand with the postage stamp backplate
without the tabs on the sides.
Bob
dckrsn- Diamond Member
Posts : 2512
Join date : 2010-10-21
Age : 68
Location : Long Island, New York
Re: No mounting hole horseshoe backplate
Roddie, Cox actually made 3 different height deflectors. I
guess it had to do with exhaust porting, per the Daniels/Sitter
handbook.
It took me a while to find the correct one for
a Spook restore.
Oh yeah, the "Radiator Clamp" deflector too.
Bob
guess it had to do with exhaust porting, per the Daniels/Sitter
handbook.

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
dckrsn- Diamond Member
Posts : 2512
Join date : 2010-10-21
Age : 68
Location : Long Island, New York
Re: No mounting hole horseshoe backplate
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!
Glad you got it though!
Cribbs74- Moderator
Posts : 11391
Join date : 2011-10-24
Age : 47
Location : Tuttle, OK
Re: No mounting hole horseshoe backplate
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.
Jason_WI- Top Poster
Posts : 3074
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Marleysky- Diamond Member
Posts : 2868
Join date : 2014-09-28
Age : 68
Location : Grand Rapids, MI
Re: No mounting hole horseshoe backplate
Cool Beans! I always get a buzz from stumbling across something
I've heard about, but never seen.
Bob
I've heard about, but never seen.
Bob
dckrsn- Diamond Member
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Join date : 2010-10-21
Age : 68
Location : Long Island, New York
Re: No mounting hole horseshoe backplate
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:

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.
KariFS- Diamond Member
- Posts : 1706
Join date : 2014-10-10
Age : 49
Re: No mounting hole horseshoe backplate
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:
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


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.

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.


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.


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

Re: No mounting hole horseshoe backplate
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
batjac- Diamond Member
Posts : 1929
Join date : 2013-05-22
Age : 57
Location : Portland, OR, USA
Had @ blue similar one...
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.
Happydad





happydad- Rest In Peace
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Location : Escondido, CA
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