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BMW 8025

BMW Triebwerkbau GmbH, Munchen-Allach

BMW 8025 small turbojet engine developped by BMW Triebwerkbau GmbH., Munich Allach, is based on the company's BMW 6002 portable gas turbine powerplant introduced in 1959.

The 8025 has a dry weight of 77 lb. Takeoff thrust is approximately 79 lb. which, without any change in basic engine weight and dimensions, will be increased to about 93 lb. 

The engine is fitted with an electric starter and operates on any standard fuel, but for economy and safety the use of light fuel or diesel oil is recommended. Fuel also is used for lubrification. 

Prototype of the BMW 8025 was shown for the first time at the 1960 Hanover Air Show. 8025 had proved most successful installed in the Allgaier H.30TS.

BMW 8025 Technical data

ManufacturerPBS, První brnenská strojírna Velká Bíteš, a.s
Initial testing
TypeCentrifugal-flow turbojet
Nb. built


Diameter380 mm14.96 in.
Length713 mm28.07 in.


Not equipped45 kg99.2 lb


Max RPM45,000 rpm
Idle RPM rpm  
Thrust at Max46 kg101.4 lb
Thrust at Idlekglb
Pressure ratio / 1
Max Flow kg/s

Fuel Comsumptions

At max RPM1.2 kg/daN.hr1.2 lb/lbf.h
At Idle RPMkg/N/Hroz/oz/h

J.E.T Cobra Technical data

ManufacturerJames Engineering Turbines Ltd
Initial testing1997
TypeCentrifugal-flow turbojet
Nb. built


Diameter197 mm5.12 in.
Length with nozzle444 mm7.76 in.


Not equippedg oz
equipped3100 g 109.34 oz

Performance Ratings

Max RPM105.000 rpm
Idle RPM33.000 rpm
Thrust at max226 N50.70 lb
Thrust at IdleNlb
Pressure ratio3 / 1
Max flow0,31 kg/s

Fuel Consumptions

At max rpm0,8 kg/N/Hr28.2 fl oz/N/h
At idle rpmkg/N/Hroz/N/h

BMW 8026

BMW Triebwerkbau GmbH, Munchen-Allach

BMW 8026 Envisaged chiefly as a means of making gliders and  sailplanes independent of winches or tugs, the 8026 turbojet weighs 84 lb. and consumes 4.4 gal of diesel oil in 25 min. 

BMW suggested 15 min for take-off and climb to 6,600 ft, there after soaring with 10 min power always available should lift be absent.

Electric starting is provided for operation from the cockpit, lubrication is effected by adding oil to the fuel, and BMW claimed that "in service no maintenance is necessary except refuelling."