BMW Take Off Aircraft Motor


TakeOff Specifications / Datasheet

Boxer – Propeller drive

As new flat Boxer engines the 1100 RS/ GS/ have been introduced years ago into the quantity production. It is now time to let this technological top performance of the engine building fly.

As a result of our experiences with the Boxer-engines as aircraft engines since 1988, according to the state of the art we realized our ideas about a modern, high-performance propeller drive.

For ultralight planes this drive has been certified since 4/98. It runs with very few vibration, is quiet, extremely economical and strong.

The Highlights;

  • Enormous power weight (to 0,77 kg/hp)

  • Extremely economical consumption (225 g/kW/h)

  • Processor controlled injection

  • Non-polluting due to regulated 3-way catalytic converter

  • Height compensation by crusher gauge sensor

  • Continuous duty depending on motor 43 – 74 kW (70 – 100 hp)


Type Volume Compression Power
R 1,1 RS 1085 ccm 10,7:1 66 kW/90PS/7200 min-1
R1,15 RS 1130 ccm 11,3:1 70 kW/95PS/7250 min-1
R 1,1 S 1085 ccm 11,5:1 72 kW/99PS/7500 min-1

Consumption: 7 – 10L unleaded at 75 %.

Cooling system: 65% oil – 35 % air.

Four-valve-technology: separate oil cooling (50 l/h) for the outlet valve.

Ignition system: Motronic (characteristic control) with emergency running control in case of breakdown of sensors.

Ignition release mechanism: 2 independent Hall generators controlled by the crankshaft.

Mixture control: characteristic controlled injection system with sensors for rotational speed, oil temperature, throttle control position, air temperature, air pressure and lambda probe 3 bar pressure system in the injection system to avoid vapor lock.

Environmental compatibility: 3-way catalytic converter, HC-reduction about 85%; NOx-reduction about 80%.


Helical, with hardened and ground gearwheels.

Gear reduction: (2,46; 2,75; 3,05, 3,46 :1 possible)

Springless, one-piece centrifugal automatic-clutch (rotational speed of action 2800 1/min)

Rotational oscillation damper (absorbs rotational oscillations of approx. +/- 10°)

Total weight when ready for take off including exhaust system, gear and coolant: approx. 80 kg

No other two-cylinder four-stroke engine has – caused by the pistons working in an opposite manner – a so perfect mass balancing so that the flat engine works without much vibrations even without weight increasing compensation shafts.

The mass balancing gets more optimal at higher rotational speed. For the lower speed range the unfavorable traction combination of the degree of non-uniformity of the engine and the moment of inertia of the propeller is decoupled by a centrifugal clutch. A rotary oscillation damper prevents resonances between engine, gear and propeller.

Two-cylinder four-stroke engine with spur gear and centrifugal clutch

Price list

3/2003 – price in €URO

Order-No. Description without VAT / with 16% VAT

TBM 10 – BOXER-flat engine R 1100 S (72 kW at 7200 1/min) with Motronic – characteristic controlled ignition and lambda probe, starter, alternator (600 W ), oil cooler, unleaded and leaded fuel

WEIGHT: 61 kg

PRICE: 5490,- 6368,40

TBM 11 – BOXER-flat engine R 1150 RS/RT (70 kW at 7200 1/min) with Motronic- characteristic controlled ignition and lambda probe, starter, alternator (600 W), oil cooler, unleaded and leaded fuel

WEIGHT: 61 kg

PRICE: 5490,- 6368,40

TMGo 3,5 – Spur gear, helical, hardened and ground gearwheels, gear reduction (3,5; 2,96; 2,75 and 2,46:1 is possible) matching for BOXER 1100 series

WEIGHT: 7 kg

PRICE: 1230,- 1426,80

TMGu 3,5 – like TMGo 3,5 but prop line downside

WEIGHT: 7,5kg

PRICE: 1325,- 1537,-

TFD 02 – Centrifugal clutch, spring less, rotational speed of action approx. 2400 1/min includes integrated torsional elastic vibration damper
WEIGHT: 4 kg

PRICE: 795,- 922,20

TEK 11 – Cable harness with motor sided wiring and 4m long 12-core line to the cockpit

WEIGHT: 1 kg

PRICE: 340,- 394,40

TNG 02 – Air filter made out of glass fiber-reinforced plastic

WEIGHT: 1 kg

PRICE: 299,- 346,84

TRA 11 Exhaust system with 2 intakes, 1 outlet

WEIGHT: 3 kg

PRICE: 435,- 504,60

TRA 12 – Exhaust system with 1 catalytic connector intake, 1 outlet

WEIGHT: 3 kg

PRICE: 435,- 504,60

TKT 12 – Component parts for manifold system

WEIGHT: 1,5 kg

PRICE: 230,- 266,80

TMK 72 – Catalytic converter optional, integrate into the exhaust system

WEIGHT: 0,5 kg

PRICE: 234,- 271,44

TKM 03 – 4 Vibrating element for the drive seat

WEIGHT: 1,5 kg

PRICE: 185,- 214,60

TPM 01 – Electrical fuel pump, 3 bar pressure system

WEIGHT: 0,5 kg

PRICE: 135,- 156,60

TNL 03 – Adjustable 3-blade air propeller in pull- and push-version, ∅ 1730 mm

WEIGHT: 5,6 kg

PRICE: 1180,- 1368,80

TNL 02 – Adjustable 2-blade air propeller

WEIGHT: 4,5 kg

PRICE: 840,- 974,40

TEP 02 – Setting gauge for propeller

PRICE: 49,- 56,84

TMA010 – Oil temperature indicator with sensor ( ∅ 52 mm)

PRICE: 92,- 106,72

TMA020 – Oil pressure indicator with sensor ( ∅ 52 mm)

PRICE: 134,- 155,44

TMA030 – Revolution counter ( ∅ 52 mm)

PRICE: 95,- 110,20

TMA040 – Operating hours counter ( ∅ 52 mm)

PRICE: 92,- 106,72

The BOXER-engine 1100 with the TAKE OFF gear variant has been developed for land vehicles. This drive does not conform to the standard of aircraft industry. The drive is not tested or certified for the operation in aircraft.

After tests the manufacturer or experimental manufacturer of the air sports equipment has to decide on his own responsibility, how far this drive concept can be used in air sports equipment (UL) with safe gliding flight characteristics, that can safely land in case of engine failure.

The BOXER-manufacturer and TAKE OFF do not assume any liability for consequential damages that are caused by a drive breakdown of an aircraft or air sports equipment.

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