What tiny Cox engine is this?

Digging through my stuff and came across my OLD u-control engines (1950's).  I identified all except this one which is smaller than my Thimble Drome .049.
Some parts are missing and would like to make it whole again.

Yours is a .049 "190" product engine from the 1960's. They were made from 1962 to the late 1960's to power various Cox RTF's. Because your .049's nose taper is wider, I suspect it to be possibly from the latter half of the 1960's.

En-Academic Wikipedia - Cox Model Engines

en-academic wrote:* 1962 Series 190 Product Engine (Cat#190) Babe Bee with plastic backplate and brass needle valve. Various shapes were used depending on the model they were fitted to. Some had dual bypass port cylinders while others had single, it depended on the airplane.

It is commonly called a "postage stamp" engine. I have 2 of them salvaged from my RTF's while in high school, a Cox Piper Cub L-4 Grasshopper (WW2 observation plane) and a P-51 turtle deck (earlier version).

Carl Goldberg seeing a way to encourage sale of his half-A C/L kits, sometime not long after the 190 came out, designed and sold a nylon engine mount for it, to help owners salvage the engine when the RTF was destroyed and reuse them in balsa kit aircraft with a separate fuel tank. It had the same bolt pattern as the Cox .049 tank Bee engines, so they adapted readily, cost then $0.59 US each.





These are my 190's with the CG mount:





Some have made their own mounts out of pieces of sheet metal, cut fit, drilled and bent also.

There are two versions. One with Babe Bee like power, may be more is single bypass with sub-port induction (SPI, air gap with piston skirt when piston is at top dead center.) The stronger one with power similar to Black Widow was used in heavier / larger RTF plastic planes. It is dual bypass. The red (some were in white) back is made of a special durable nylon called Dupont Delrin. It is tough, doesn't harden with age, and is superior to the latest gray plastic horseshoe backs.

Yours looks like it only needs a prop screw and mount. The Goldberg EB-1 mount does occasionally come up in E-Bay, but although thousands were made, they are not as common. If in NOS packaging, some of the bidding lately has commanded ridiculously high prices for what used to be a $0.59 item.

Perhaps the easiest way to reuse the engine is remove the back, save it. Then buy one of the relatively inexpensive horseshoe back assemblies and install it, use it.