Bit of trivia

I'd say they got near enough identical numbers to the the medallion .049

Dunno about that, free fighters rarely lose their planes.
Maybe a couple but not many.

Not sure where you got the idea the NFFS .051s were "fire breathing demon"....from what I read they were simply special order Medalions for Bob Beecroft. Medalions were poor mans TDs

The below information is copied in its entirety from this site:

http://www.mh-aerotools.de/airfoils/cox_frameset.htm


In 1996 NFFS president Bob Beecroft approached Cox to produce 300 Medallions for the NFFS (National Free Flight Society). The idea was to allow for easy swapping from ½-A to A for “Nostalgia Free Flight” events.

To make the illegal usage of Tee Dee .051 cylinders impossible, these Medallions were to have dual slot exhausts. The transfer system of the untapered cylinder consists of two bypass flutes each having a single boost channel (the Tee Dee hast two boost channels). The later Killer Bee .051 has exhaust slits of different size. The piston shows an added grove to indicate the .051 displacement.

Just at the same time Estes took over the reigns at Cox and they were not much interested in such a small and not very profitable production run. In the end, 258 engines were produced and shipped in December 1996. The small production run makes the Medallion .051 a quite rare engine - the much touted Venom was made in about 1000 samples.

In contrast to the standard production engines these engines bear engraved serial numbers ranging from 1 to 258 - a leading 5 was added to indicate the unusual displacement. All engines were sold through the NFFS to individual free flight enthusiasts. A complete record of the engines and their numbers exists. The pictures sample is #5238.

If I am all wet and know not of what I speak I am willing to learn. In my opinion a good running TD 049 ( I have several) is a better motor than my only running Medalion .051 (not a NFFS version)