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Thursday, July 26, 2012

ED Bee MK1



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ED Bee MK 1 Diesel
Circa Mid 1950's







Design History:
Manufacturer Electronic Developments (Surrey) Ltd in the mid 1950's;
Distributed by E.D. Kingston on Thames, Surrey, England;
This engine is the very successful MK1 Bee which was followed by the equally successfully MK 2




Design Features:
Diesel power class 2 stroke;
Fixed type carburetor without speed control;
Induction by rear rotary valve;
Non ball bearing crankshaft running in bronze journal bearing; and
Integral plastic fuel tank often missing from well used engines.




Specifications and Data:
Displacement 0.060 cu. in. (0.983 c.c.)
Bore 0.437 in diameter. (11.11 mm.)
Stroke 0.400 in. (10.17 mm.)



Observations:
This was my first diesel engine and it sat in a box for many years before getting around to running it. Installed in a single channel Keil Kraft high wing cabin model controlled via a rubber powered simple escapement hooked to the rudder (one pulse right two left). A perfect recipe for relaxing flying, until faced with a downwind fly away. The engine is pictured here sporting its new Kirby manufactured needle valve assembly and custom compression adjuster made with a special thread to match the thread restoring Helicoil insert that was used to repair the stripped head threads.  See this little gem run on homemade fuel, using a mixture of 33 % Kerosene, 33% Castor oil and 33% Cold Engine Quick Start (Ether) with the remainder Cetaine Boaster added to improve combustion.
It was not easy to start and I found that it was particularly sensitive to both needle valve and compression settings. Where, in the case of the compression, less than 1/8 turn meant the difference between running and not running.


http://youtu.be/H4Px10SPCIs
  



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