Yankee was distributed by Waigo. French company. Won 1st offroad 1/8 world Championship. Yankee still maintains its business in 1/5 scale and there is quite good rc history carried in its webiste. Quite expensive and deluxe at that time in HK before the Taiwan cloned it. The very remarkable engine running sound with its special "birdy" exhaust pipe. One team from waigo and other team from 凱旋 had done well with it before the lightweight japanese buggies + OS engine appeared. Same situation as in the European market.
Yankee was difficult to build , you have to drill the holes to assemble the gearbox and bulkhead, not easy for students or drivers without drilling press !! The taiwan clones are much customer friendly.
I used to have a Yankee F1 long long time ago. I can't remember if it is 1/4 or 1/5. French car very hard to build, like polarbear brother said need to keep drilling holes and nothing fit properly.......