The BT-50SB is a 2.84 cubic inch [46.5cc] engine manufactured by FUJI-IMVAC INC. It has a horsepower of 5.2 hp @ 9,000 rpm and features CDI ignition style with automatic timing module. The engine operates in the RPM range of 1,200 – 9,000 rpm and uses gas/2-cycle engine oil fuel. It weighs 4.8 lb [2.2kg] with the muffler. The document also provides safety tips and warnings including the use of balanced spinner and prop, securely tightening the spinner and prop, not using a prop that has hit the ground, and keeping foreign objects away from the propeller.
This document is the Operator's Manual for the Fuji-IMVAC BT-50SB, a 2.84 cu in (46.5cc) 2-cycle engine designed for use in model aircraft. The manual provides detailed specifications, including a maximum horsepower of 5.2 hp at 9,000 rpm, and outlines critical safety warnings regarding propeller balance and fuel handling.
| Displacement | 2.84 cu in [46.5cc] |
|---|---|
| Horsepower | 5.2 hp @ 9,000 rpm |
| Ignition Style | CDI Automatic |
| RPM Range | 1,200 — 9,000 rpm |
| Fuel Type | Gas/2-cycle engine oil |
| Weight | 4.8 Ib [2.2kg] w/muffler |
The recommended spark plug is a Champion RCJ-6Y.
The plug gap should be 0.016" to 0.024" [0.4mm to 0.6mm].
You need to run the engine with a fuel mixture that contains a 25:1 (4% oil) fuel/oil ratio.
Once the engine is broken in, use a 40:1 (2.5%) fuel/oil mix.