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T400 Gear Boxes are available in two ratios. The 1.7:1 ratio unit features a bushing supported shaft while the 3:1 ratio unit features a ball bearing supported shaft. Both are designed for 400-size motors and feature an aluminum frame, brass pinion for strength and a nylon spur gear for reduced noise.
This is a T400 Gearbox with 3:1 Gear Ratio and uses Ball Bearings. For use with the Great Planes Park Flyers. FEATURES: Designed for low noise and low maintenance, Park Flyer gearboxes used with 400-sized motors get the maximum climbing power and flight time from each mAh. A bronze pinion gear is used for strength and a nylon main gear for quiet, low friction operation. Compatible with APC's light, durable Slo-Flyer Propellers Utilizes smooth-running, long-lasting ball bearings Lightweight, aluminum, open gear case resists damage Aluminum propeller adapter and washer One year warranty INCLUDES: One assembled T400 gearbox 3:1 ratio (includes 34 tooth nylon gear) One brass 11 tooth pinion gear (not carried separately) One 3 x 3mm pinion set screw Two 2.4 x 5mm phillips head mounting screws REQUIRES: Attaching the gearbox to the motor with a small phillips head screwdriver. Install pinion onto motor shaft with a 1.5mm hex head wrench Installing propeller onto shaft with a medium sized phillips head screwdriver. (Use threadlocking compound to hold screw tight.) Assembly of gearbox/motor unit onto an aircraft SPECS: Overall Length: 35mm (1.4")(back of gearbox to front of adapter) Overall Height: 37mm (1.5") Overall Width: 32mm (1.2") Mounting Holes On-Center: 16mm (.67") Propeller Adapter Shaft Diameter: 6mm (.24") Propeller Adapter Shaft Length: 9mm (.35") Main Shaft Diameter: 4mm (.16")(the adapter mounts onto this one) COMMENTS: For T-400 motor, use GPMG0325. There was some question whether this is really a 3:1 ratio. Not to worry. That is because 34 teeth to 11 teeth equates to 3.09090909 to 1 thus rounded to 3:1 JAL 6/1/01 ir/jl up tjt 6/29/01