O.S. GT60 Gas w/Muffler

Tower Stock# LXCVPX  •  Manufacturer Stock# 38600
O.S. GT60 Gas w/Muffler (large view)
Notes from our tech department:
This is the O.S. GT60 Gasoline Large Scale Airplane Engine
with Pitts Style E-6020 Muffler.


Linerless cylinder with the cylinder head integrated with the
cylinder, this arrangement allows for extremely precise intake/
exhaust timing and very high scavenging efficiency resulting in
higher output
IG-02 electronic ignition system can be powered by 4-6 cell NiCd/
NiMH batteries or 2-cell LiPo batteries
Custom designed Walbro carburetor mounted to rear of engine with
integrated choke rod guide
Two year limited warranty through Hobby Services beginning at date
of purchase


O.S. GT60 Gasoline Engine, IG-02 Electronic Ignition. E6020 Muffler,
CM6 Spark Plug


Propeller: Break-In 23x8
Acro/Scale 22x10-12, 23x8-10, 24x8-10
Unleaded regular gasoline (no need to use high octane)
Two-Cycle Oil: Break-In, Klotz Modelube recommended, mix at 30:1
gas/oil mixture for 10 flights, 1.3 - 1.6 gallons (5-6 liters) of
After Break-In: mix at 50:1 ratio, See COMMENTS below
Electric starter NOTE, The propeller must be brought up to at least
100RPM in order for the electronic ignition to work


Displacement: 3.656 (59.91cc)
Bore: 1.732" (44.0mm)
Stroke: 1.551" (39.4mm)
RPM Range: 1,600-8,000 RPM
Output: 6.00 hp @ 7,000 RPM
Weight: Engine, 49.38oz (1400g)
Ignition module, 3.7oz (105g)
Muffler: 6.28oz (178g)
Suggested Propeller Size and RPM Data:
22x10 6,900 RPM
23x8 7,000 RPM
24x8 6,550 RPM
24x10 6,150 RPM
Distance/Vertical Mounting Hole Centers: 2.6" (66mm)
Distance/Horizontal Mounting Hole Centers: 3.1" (78mm)
Height of Mounting Tabs: 3.4" (85.6mm)
Height Lower Mounting Tab/Top of Cylinder Head: 6.9" (175mm)
Height Lower Mounting Tab/Crankshaft Center: 1.7" (42.8mm)
Height Crankshaft Center/Top of Cylinder Head: 5.2" (132.2mm)
Cylinder Head Width: 6.6" (168mm)
Width at Mounting Tabs: 3.8" (97.6mm)
Center of Muffler Mounting Holes: 1.6" (40mm)
Distance/Crankshaft Center to Muffler Hole Center: 2.7" (69.5mm)
Length from Carburetor to Backplate: 1.5" (38.8mm)


If using a different brand of oil other than Klotz, OS recommends
their own mix ratio which may differ from the manufacturers'
For 40:1, and 50:1 oils, OS recommends a 30:1 gas/oil mixture
25:1 is 5oz of pre-mixed 2-cycle oil or 151 ml per gallon of fuel
30:1 is 4.3oz of pre-mixed 2-cycle oil or 126 ml per gallon of fuel
40:1 is 3.2oz of pre-mix 2-cycle oil or 95 ml per gallon of fuel
50:1 is 2.6oz of pre-mix 2-cycle oil or 76 mll per gallon of fuel

jxs 10/29/12

See Tower Catalog page 173.
Easy RC: Engines
‐ Manufacturer's Web Page ‐
‐ Mailing Address ‐
‐ Additional Contact Information ‐