Most of the Japanese dive bombers and torpedo plans had fixed gear. The airplanes you are refering to were probably Vals. Most fighters had retracts, but there were a few with fixed gear at the start of the war. There was the A5M Claude (predessor of the Zero) and it was the subject of a building article in the November 03 issue of Flying Models magazine. It was designed at around 80" to use small gas engines. There is also the Nakajima Ki27 Nate for which plans and a laser cut wood package are availible from Reid's Models http://www.reidsmodels.com/products/products_set.html but it is also designed for gas engines around the 35 to 40cc range. There are probably more out there, but those and the Skyshark kits are all I can thik of.

-Bob George