O.S. gasoline power for helis.
Its power is perfect for sport, 3D and scale pilots alike. But that’s only a part of what makes the GT15 super. It also offers superb fuel economy, a pumped carb to deliver fuel dependably, the ease of the IG-05 Ignition module and smooth running without constant adjustments. And since it’s about the same size as most .90 glow engines, it’s an easy retrofit, too.
Compact — fits most .90-size helis with only minor modifications.
Offers outstanding fuel economy.
Runs consistently without constant pre-flight adjustments.
O.S./Walbro®-developed pumper carb ensures consistent performance regardless of attitude, altitude or fuel level.
Features the IG-05 Ignition Module that is designed specifically for helis.
The IG-05 Ignition Module arrives with a straight plug cap for easy installation. It’s compatible with a wide range of battery chemistries, including NiCd or NiMH, LiPo and LiFe packs.
The carburetor was designed specifically for the GT15 — and developed with the combined know-how of O.S. and Walbro.
The squared heat sink head provides the cooling needed for top performance.
Optional E-4051 muffler (available separately) is a compact scale muffler.
The O.S. GT15HZ 2-Stroke petrol helicopter engine is also the first gasoline engine designed especially for 90 class engine/ 700 class electric helicopters. With an approximate runtime ratio of 1 minute per 10cc of gasoline, it offers astoundingly long flight times and low cost alternative to glow fuel.
This engine is designed to expressly be run by gasoline fuel. Use regular gasoline. It is not necessary to use high octane gasoline. Mix high quality commercially available 2 stroke engine oil with a 25: 1 ratio.
Gasoline engine generates larger amount of heat. To prevent overheating, large cooling heatsink cylinder head is employed which ensures steady power supply by cooling entire engine efficiently.
The Ignition unit has been designed with ignition timing specifically for helicopter engines and features a straight plug cap for easier installation in the limited space. Suitable for use with a 4.8-7.5V battery.
OS test data shows with a 300cc fuel tank you can achieve an approximately 25 minute long flight!
Same mounting dimensions as a .90 cu in engine
Large Cooling heatsink cylinder head
CDI Ignition unit IG-05
GT15HZ Helicopter Gasoline Engine
Spark Plug CM-6
Throttle Valve Lever
Choke Valve Lever
CDI Ignition Unit IG-05
English Instruction Manual
Displacement: 14.95 cc
Bore: 22.7 mm
Stroke: 24.8 mm
RPM Range: 2,000 - 16,000
Output: 2.8 ps @ 14,000 RPM
Weight: 706g Engine / CDI Ignition Unit 92g
0.912 cu in (14.95cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM: 2,000 - 16,000
Output: 2.76hp @ 14,000 RPM
Weight: Engine, 26.4oz (748g)
IG-05 Ignition Module, 3.2oz (92g)
Power Boost Pipe, 7oz (198g)
E-4051 Muffler5oz (144g)
Carburetor Adjustments; If engine responds sluggishly to increased
RPM, turn slow needle right 5° and advance throttle stick gradually
If engine hesitates before picking up speed, turn slow needle left
10° to richen mixture
Gasoline/Oil Mix: 25:1
Distance/Mounting Hole Centers Same Side: 1.02" (26mm)
Distance/Mounting Hole Centers Opposite Side: 2.1" (53mm)
Height/Mounting Tab Bottom to top of Cylinder Head: 3.5" (88mm)
Height/Crankcase Bottom to top of Cylinder Head: 4.3" (109mm)
Width at Mounting Tabs: 2.4" (61mm)
Width of Crankcase below Mounting Tabs: 1.7" (42.5mm)
Distance between Exhaust Mounting Hole Centers: 1.6" (42mm)
Length from Center of Engine to Front Bearing: 2" (52mm)
Length from Backplate to Front Bearing: 3.14" (80mm)
Length from Center of Engine to end of Crankshaft 3.5" (88mm)
Length from Backplate to end of Crankshaft: 4.75" (121mm