Stemming from the mid-1900's there existed a class of full-scale air racing called "Goodyear", evolving over the years and eventually being called called "Formula I".
In the 60's, a CL racing event was created and was called "Goodyear". That event still exists, now officially renamed as "Scale Racing" in the AMA rule book. Most still refer to it as "Goodyear", hence: "GY". The CL racing event requires a 1/8 scale profile of an actual Goodyear or Formula I airplane along with a number of other rules that define the event.
AMA GY (i.e., Scale Race) is not widely flown, for a number of reasons.
The "Sport GY" event, several similar versions around the country, is intended to simplify the event to attract the "casual" racers. The version we run in Texas can be found at
http://www.dmaa-1902.org/Rules/Sportsman_Goodyear.pdf This event is proving to be popular, flown unofficially at the NATS (sponsored by the DMAA or others). Performance is reasonable as is cost (no high $/high performance engines are allowed).
My model was built primarily for Sportsman Goodyear but also easily converted into an AMA Scale Racer for the one contest a year where the event is flown (the NATs). As a consequence, several concessions were made in the construction that would not have been made with a full-blown AMA GY.
Bill Bischoff had a great construction article (Margaret June aircraft) published in
Model Aviation a year or so ago that further describes what we're doing.
(Bill and I were obviously typing at the same time!
)