OVERVIEW
The FA-91 is one of the most popular selling engines in Saito's extensive line of four-strokes. The .91 fits perfectly into most airplanes designed for .60-size two-strokes offering the ability to swing larger diameter props with more thrust than the two-stroke. Many pilots simply prefer the powerful sound of a four-stroke. Now Saito is offering a new engine that offers even more power than the .91 but that's similar in size and weight.
The FA-100 will turn an APC 14 x 8 prop 300 to 700 rpm more than either the Saito .91 or O.S. .91. At only 19.2 ounces (less muffler), it weighs nearly 2 ounces less than the O.S as well! The Saito FA-100 is not just a punched out .91. It features a newly tooled case that shares the mounting dimensions of the O.S. 91. This allows it to be used with the many after-market engine mounts already available to fit this engine.
The Saito 100 idled and transitioned beautifully from the first start due to the included new Hangar 9 Super Plug (HAN3011) that now comes with all Saito engines. This plug greatly improves idle and transition in all four-stroke engines. After a short slightly rich break-in, we peaked the needles at 3-5/8" out on the high-speed and a� turn in from flush on the low-speed needle.
Our staff commonly uses 30% heli fuel in Saito engines, as it not only gives better top-end performance but it runs smoother, gives a better transition, and runs cooler.
In flight the FA-100 was one smooth operator. Transition and idle were clean and crisp with instantaneous response. No dead sticks occurred in the first six test flights, despite purposefully long high-altitude idles, followed by rapid full-throttle transitions. The 30% helicopter fuel gave a noticeable boost in power, plus the added oil in the fuel adds a nice trail of smoke.
If you're looking for a powerful lightweight four-stroke to power your latest .60 through .90-size project, you don't have to settle on a 91. Check out Saito's new FA-100.
SPECIFICATIONS
Muffler Type:Cast
Mounting Dimensions:115 x 60 x 128 mm
Fuel:10% - 30% Synthetic
Benchmark Prop:14 x 8 APC
Total Weight:21.1 oz
Cylinders:Single, Chrome Plated
Type:4-stroke
Displacement:1.10 cu in (17.10 cc)
Bore:1.14 in (29.0 mm)
Stroke:1.02 in (26.0 mm)
Engine (Only) Weight:19.5 oz
Muffler Weight:1.6 oz
Crankshaft Threads:M8x1.25mm
Prop Range:13 x 9 - 14 x 10
RPM Range:2,000 - 11,000
Cylinder Type:AAC
