Cox 049 Delrin Back Plate Collection

Here is my collection of 049 Delrin back plates. As far as I know I
only need one more to have a complete set of those that actually went
into production, a first version clamp in type in white Delrin.
I know that a blue horseshoe version was made but they never
went into production. If anyone knows of any other variations please
chime in!

Here is the complete collection.


The first were made of aluminum and later Delrin.
They were clamped between the case and the firewall.
Used only on the Avion Shinn.
It is one of these in white Delrin that I think I need to complete the collection.



The next version is commonly known as the "postage stamp" back plate.
Believe it or not, the red one here was the most difficult for me to find.
It took me over 2 years of searching to find it! Are they that uncommon?


Next came the "postage stamp" with tabs on the sides. These were produced
in white, red, beige, grey, and cast aluminum. As far as I know grey was used
only on the Sandblaster car, cast aluminum on the Spook airplane and Spook engine.


Last came the "horseshoe" back plate. There were several colors and variations
produced. Colors were white, red, beige, grey, orange, and black. Some were
made in red without the 4 holes for mounting screws, these are somewhat
scarce. According to the Cox Model Engine Handbook only about 6,000 were
made. Black versions were produced with the standard metal reed retainer and
later with the separate reed carrier piece. The SureStart 049 came with the
matching grey choke tube.