MOTOR OS 70SZ-H RING HELICOPTERO 17000

This is the .70 SZ-H Ring Engine from O.S. designed with the FAI F3C Pilot in mind.

FEATURES:

Ringed for long life. 3-needle carb for ultimate tuning precision. (Settings are covered on pages 14 & 15 of the manual)

High Speed:

2 turns OUT Medium Speed: 1 tunn OUT Idle Mixture: Refer to picture on page 14

Two extra mounting lugs on front allow modelers to mount engine securely in helis. Designed with the FAI F3C competitor in mind, allowing 3D pilots an edge over the standard .60 size engine. Throttle assembly reference marks make it easy to note and restore finely tuned settings after maintenance. Front and rear ball bearing-supported crankshaft reduces friction and wear. Large heli cylinder head offers generous cooling fin area, with increased webbing on crankcase front for heat dissipation. Installs in the same space as a .61 engine.

INCLUDES:

One .70SZ-H Ringed Helicopter engine #8 OS Glow Plug and Decals

REQUIRES:

Muffler & Fuel

SPECS:

Displacement: 11.50cc (.702cu in)

Bore: 25.8mm (1.016in)

Stroke: 22.0mm (.866")

Power Output: 2.5PS, 2.47 HP at 16,000 RPM

Weight: 553.5g (19.5oz)

Practical RPM Range: 2,000 - 18,000 RPM

Crankshaft Thread Size: 5/16-24

Length: 81.3mm

Backplate to the front of the crankcase

Width: 42.6mm width of engine neglecting the mounting flanges 25mm

Distance between mounting hole centers 60mm

Distance from rear mount to front mount centers 52mm

Side to side centers of rear mounting holes 42mm

Side to side centers of foremost mounting holes 42mm

Distance between mounting holes for exhaust