Kolb Twinstar Mark-III Pilot Operating Handbook page 3

Engine: The Rotax-912ULS engine is a four cylinder, air- and
water-cooled, normally-aspirated 4-stroke powerplant.
Displacing 1211cc (74 c.i.d), the engine is rated at 81
horsepower. Maximum engine speed is 5800 rpm, limited to 5
minutes. Maximum continuous rpm is 5500, yielding 79 hp.
Normal cruising range is 4500-5500 rpm. The engine employs
a 2.27-to-1propeller speed reduction gearbox. The engine uses
a dry-sump (i.e., separate oil tank) oil system, and circulates oil
through an external radiator (oil cooler). Cylinder heads are
water-cooled (50/50 water/glycol mix), utilizing a coolant
radiator. Oil capacity is 3.2 quarts. Dual, altitude-compensating
constant depression carburetors are effective up to 18,000 feet
MSL without need for adjustment or mixture control.
Recommended fuel is 87 octane (or higher) automotive
gasoline, or 100LL aviation gas.
Ignition System: The Rotax 912ULS engine utilizes a
breakerless, capacitive-discharge type ignition system. Dual
and independent solid-state ignition modules provide spark
energy to each of the two spark plugs per cylinder (8 spark
plugs total). This magneto-type ignition allows the engine to
operate independently of the aircraft electrical system (i.e.,
engine will still run with the master switch "off"). Two ignition kill
switches are located on the instrument panel, allowing for test
and shutoff ("kill") of each ignition circuit.
Throttle: Engine power is controlled through a conventional,
single-lever throttle setup. No mixture control is necessary.
Moving the throttle lever forward increases engine power; aft
lever movement decreases engine power. The throttle is
accessible on the pilot's side only.
Instruments: [ Diagram - See Appendix ]
Propeller: The aircraft is equipped with a Powerfin ground-
adjustable propeller (model F-R372P). The 3-blade prop is 70
inches in diameter. The blades are of composite construction.
Torque value for all twelve 8mm bolts is 175 inch-pounds.
Oil System: The Rotax 912ULS engine utilizes a dry-sump,
forced lubrication oil system. The oil is stored in an external oil
reservoir, and an engine-driven oil pump circulates the oil
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