Flywheel R21 Marine Direct Drive Short

This is a short aluminium marine flywheel for our O.S.Speed R21-M05 & R21-M06 engines. It’s used in applications where you don’t use a gear-reduction gearbox = direct drive. Such as a outrigger hydroplane etc.

Features:

• Fits all 3.5cc racing car engines with a SG-pilot crankshaft
• Diameter: 32mm
• Length: 12mm
• Made for O.S.Speed flywheel cone #OS71801110 (the correct cone is included with all our O.S.Speed R21-M05/06 engines)
• Recommended Flexwire Collet: Speedmaster 1/4-28 3/16″ collet without pilot flange (#SPDNC-1428-P0 – not sold by us)
• Recommended Flexwire Collet: Octura 1/4-28 3/16″ collet without pilot flange (#OCFH1414 – not sold by us)

Notes:

• The 5mm protuding part of the crankshaft needs to be cut off by an experienced racer/hobbyist.