Thunder Tiger - Pro 21M Outboard

Product No. 9567

A race-proven PRO-21M power head is mated to a lower unit that utilizes the best aspects of gear and flex-cable drive technology. A innovative design that is sure to increase the popularity of the 3.5cc Tunnel Hull class.

A special set of precision helical gears transfers power from the crankshaft to the flex-cable, resulting in substantially reduced cable wear and maintenance, while the integrated expasion chamber (muffler) reduces exhaust noise.

The Marine series are manufactured by automated computer-controlled machinery, resulting in a product that looks and performs better. The engine mount allows adjusment to both propeller depth and angle with a Prather S215 propeller which is included. Precision air bleed carburetor makes adjustments simple.

A Closer Look

Features

• Top grade CNC equipment, state-of-the-art technology are used.
• Improved quality; ISO9001 Certified which guarantees the maximum power and performance.
• Gear drive / flex cable.
• Prather S215 propeller which is included.
• Adjustable prop depth and running angle.
• Air bleed carburetor makes adjustments simple.
• Economic marine engine for the serious boat racer.

Requirements

• Fuel with at least 20% lubricant with 5-15% nitro content, fuels containing a blend of both castor and synthetic oils are best
• R/C long type glow plug such as the O.S. #8
• Glow starter
• Shore equipment

Specifications

• Displacement: 0.211 cu in (3.46 cc)
• Bore: 0.654 in (16.6 mm)
• Stroke: 0.630 in (16.0 mm)
• Practical RPM: 3,000 - 38,000
• Output: 2.10 hp @ 30,000 RPM
• Weight: 25.39 oz (720 g)
• Gear Ratio: 1.19:1

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