No mounting hole horseshoe backplate

That’s a pretty cool find!! Good eyes there Jason! OK now ya gotta Print a mount for it!

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.

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 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.

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

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!

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.

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





Backplate, heat shield, 128tpi needle!  Goodies!

Cool Beans! I always get a buzz from stumbling across something
I've heard about, but never seen.
Bob

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



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.

@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 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