While Saito, Magnum, and O.S. Max all make fine 4-stroke engine products, don't overlook Thunder Tiger's wonderful F-91s four stroke engine. This engine may provide the ideal fit for most .60-sized warbirds. The TT F-91s is real stump-puller of an engine and its 25.7 ounce weight will help balance out models that might otherwise tend to be a touch tail-heavy.

The Thunder Tiger F-91s comes with a 3-year warranty and will provide many, many years of powerful and reliable service. The only disadvantage to using the F-91s on your F-6F Hellcat instead of a Saito or O.S. Max 4-stroke is you'll have to figure out what to do with all of your leftover money. The folks at www.thundertiger4u.com sell the F-91s for $194.99 and will provide free ground shipping within the contiguous United States. The folks at www.infinitehobbies.com offer the F-91s for $184.99 and ship all orders over $100 via ground for free.

Good luck and good shopping!