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OS GT15 HZ II Petrol with Powerboost Pipe Combo # OS38157 529,90 €

Mon, 01 Dec 2025 09:39:02 +0100

The O.S. GT 15 HZ II 15cc petrol engine is designed for helicopters of the 700 class. Thanks to the new enlarged cooling head and additional cooling ribs on the crankcase, the engine runs cooler by approx. 12 ° C and can be adjusted much better than the previous version. Likewise, the cylinder head has been revised, which is good for the running behavior.

Specification

Diameter of fixing hole [mm]:	4.2
Bore [mm]:	27.7
Width [mm]:	61
rpm range, approx.:	2000 -16000
All-up weight [g]:	1038
Height approx. [mm]:	109,6
Stroke [mm]:	24,8
Cylinder capacity [ccm]:	14,95
Cooling system:	Air
Length to hub:	90,2
Output [W]:	2.76
Output [kW / PS] at [rpm]:	14000
Carburetor :	WT-1067
Shaft thread:	UNF5/16-24

The O.S. GT 15 HZ II fits into the models:

Align 700N
Goblin 700

OS Max 105HZ-R # OS18750 434,90 €

Mon, 01 Dec 2025 09:39:02 +0100

These are the engines that precision aerobatic and 3D heli pilots have been waiting for! In order for 90-sized machines to nail huge maneuvers and hardcore, smackdown-style 3D it's all about power, and both the 105HZ-R have it in abundance. Displacement has been increased by 15%, while a huge venturi rams air into the carburetor, producing massive power. Plus, they fit in a .90-sized mounting pattern.

* Featuring the displacement of a 1.05 in the mounting space of a .90.
* More displacement means more power, and these engines boost displacement by 15%!
* A huge venturi boosts output even further.
* The machined, blue anodized heatsink head is light in weight, and cools the engine efficiently.
* An extra feature on the 105HZ-R is the DRS (Demand Regulator System), which ensures consistent fuel flow regardless of the heli's attitude.

Description
17.17 cc displacement
Twin-ballraced high-performance helicopter motor. For uniform fuel supply, a regulator is flanged to the carburettor.

Specification
Cooling system: Air
Width [mm]: 61 mm
Shaft thread: UNF 5/16-24
Distance of screw hole / longitudinal [mm]: 25 mm
Carburetor : 61G
All-up weight [g]: 608 g
Height approx. [mm]: 100,5 mm
Diameter of fixing hole [mm]: 4,2 mm
rpm range, approx.: 2000 - 16500 U/min
Bore [mm]: 29 mm
Distance of screw hole / crosswise [mm]: 52 mm
Cylinder capacity [ccm]: 17,17 cm³
Output : 3,8 HP @ 15000 RPM
Length to hub: 82,6 mm
Stroke [mm]: 26 mm

O.S.
Field of application: Helicopter
incl. silencer: No
Fuel: Nitro
Model: 2-Stroke Nitro
Item Number Manufacturer: 18750 / OSMG1961

OS Max 105HZ-R with Powerboost Pipe Combo # OS18751 589,00 €

Mon, 01 Dec 2025 09:39:02 +0100

105HZ-R Heli Engine
Enjoy huge power and performance with the compact 105HZ-R!

These are the engines that precision aerobatic and 3D heli pilots have been waiting for! In order for 90-sized machines to nail huge maneuvers and hardcore, smackdown-style 3D it's all about power, and both the 105HZ and 105HZ-R have it in abundance. Displacement has been increased by 15%, while a huge venturi rams air into the carburetor, producing massive power. Plus, they fit in a .90-sized mounting pattern.

- Featuring the displacement of a 1.05 in the mounting space of a .90.
- More displacement means more power, and these engines boost displacement by 15%!
- A huge venturi boosts output even further.
- The machined, blue anodized heatsink head is light in weight, and cools the engine efficiently.
- An extra feature on the 105HZ-R is the DRS (Demand Regulator System), which ensures consistent fuel flow regardless of the heli's attitude.

Spezifications:

Displacement: 1.048 cu in (17.17 cc)
Bore: 1.442 in (29 mm)
Stroke: 1.024 in (26 mm)
Practical rpm: 2,000-16,500
Output: 3.8 hp @ 15,000 rpm
Weight: 21.03 oz (596 g)

OS Max 105HZ # OS18700 379,90 €

Mon, 01 Dec 2025 09:39:02 +0100

* Featuring the displacement of a 1.05 in the mounting space of a .90.
* More displacement means more power, and these engines boost displacement by 15%!
* A huge venturi boosts output even further.
* The machined, blue anodized heatsink head is light in weight, and cools the engine efficiently.

Description
17.17 cc displacement
Twin-ballraced high-performance helicopter motor. For uniform fuel supply, a regulator is flanged to the carburettor.

Specification
Cooling system: Air
Width [mm]: 61 mm
Shaft thread: UNF 5/16-24
Distance of screw hole / longitudinal [mm]: 25 mm
Carburetor : 61B
All-up weight [g]: 596 g
Height approx. [mm]: 100,5 mm
Diameter of fixing hole [mm]: 4,2 mm
rpm range, approx.: 2000 - 16500 U/min
Bore [mm]: 29 mm
Distance of screw hole / crosswise [mm]: 52 mm
Cylinder capacity [ccm]: 17,17 cm³
Output: 3,8 PS @ 15000 RPM
Length to hub: 82,6 mm
Stroke [mm]: 26 mm

O.S.
Field of application: Helicopter
incl. silencer: No
Fuel: Nitro
Model: 2-Stroke Nitro
Item Number Manufacturer: 18700 / OSMG1960

OS Max 55HZ HYPER # OS15630 294,90 €

Mon, 01 Dec 2025 09:39:02 +0100

OS Max 55HZ HYPER

8.93 cm³ capacity
High-performance helicopter motor for helicopters in the 50 class.

Technical information

Distance of screw hole / longitudinal [mm]:	17,5
Distance of screw hole / crosswise [mm]:	44
Item Number Manufacturer:	15630
Model:	2-Takt Nitro
Diameter of fixing hole [mm]:	3,2
Bore [mm]:	23
Width [mm]:	52
rpm range, approx.:	2000~20000
All-up weight [g]:	408
Height approx. [mm]:	91
Stroke [mm]:	21,5
Cylinder capacity [ccm]:	8,93
Cooling system:	Air
Length to hub:	76,6
Output [W]:	1,57 (2,13)
Output [kW / PS] at [rpm]:	17000
Carburetor :	40L
Shaft thread:	UNF1/4-28

OS MAX-55HZ-R (40L-R) # OS15650 329,90 €

Mon, 01 Dec 2025 09:39:02 +0100

OS Max 55HZ-R with Demand Regulator System

8.93 cm³ capacity
High-performance helicopter motor for helicopters in the 50 class like T-REX 600N, OXY5 Nitro

Technical information

Distance of screw hole / longitudinal [mm]:	17,5
Distance of screw hole / crosswise [mm]:	44
Item Number Manufacturer:	15650
Model:	2-Takt Nitro
Diameter of fixing hole [mm]:	3,2
Bore [mm]:	23
Width [mm]:	52
rpm range, approx.:	2000~20000
All-up weight [g]:	429
Height approx. [mm]:	91
Stroke [mm]:	21,5
Cylinder capacity [ccm]:	8,93
Cooling system:	Air
Length to hub:	76,6
Output [W]:	1570
Output [kW / PS] at [rpm]:	1,57 (2,13) 17000
Carburetor :	40L-R
Shaft thread:	UNF1/4-28