Rear-mounted updraft carburetor
Helix gear-driven camshaft supported by bronze bushings
Ball bearing-supported crankshaft
Two Year Warranty
One FS-30 Four-Stroke engine
#F Four-Stroke Glow Plug
One Muffler w/Header Pipe
Fuel: 5%-15% nitromethane with 18% lubricant. Synthetic, castor, or
a synthetic/castor blend may be used.
NOTE: Certain four-cycle fuels cannot be used due to low oil content.
However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15%
(CATP9109) may be used because it has a 18% oil content.
When choosing fuels for this engine, the modeler must be sure to
select a fuel with at least a 18% lubricant content.
Starting and Field Equipment.
Propeller (see SPECS)
Displacement: 4.89cc (.299 cu in)
Bore: 19.5mm (.767") Stroke: 16.4mm (.648")
Power Output: 0.5 PS, 0.49HP at 10,000 RPM
Weight with muffler: 10.4oz (295g)
Weight without muffler: 9.8oz (278g)
Practical RPM Range: 2,500 - 13,000 RPM
Crankshaft Thread Size: 1/4-28
Valve Clearance: Between .04mm and .1mm (.0015" and .004"),
Measured between the valve tip and rocker arm.
Length: 84mm (3.31") from backplate to front of Drive Washer.
Width: 29mm (1.14") width of engine neglecting the mounting flanges
36mm (1.42") mounting holes side-to-side on-center
Height: 86.5mm (3.41")
Suggested Prop(s): 9x6, 9x7, 10x4, or 10x6
Construction: Aluminum and aluminum alloys
Needle Settings: High Speed: 2 - 2.5 turns out from fully closed
Low Speed (air bleed screw): tip of screw 1/2 way
across the small hole in the back of the
Some differences between a 4-stroke and 2-stroke engine:
A 4-stroke is quieter
A 4-stroke gets better fuel economy
A 2-stroke generates more RPM (11,000-13,000 RPM with prop
while 4-strokes rev to around 9,500 RPM)
A 4-stroke generates much more torque and will swing a larger prop
4-strokes sound realistic (sounds like a REAL aircraft engine)
upd NNA 10/27/02
updt jxs 2/25/03
updt lmm 3/31/09