MM13 - The SCHAGER engine
Technical details | ||
Year of construction | 2001 | |
Power piston | stroke | 10 mm |
diameter | 14 mm | |
Displacer piston | stroke | 10 mm |
diameter | 72 mm | |
Flywheel | diameter | 85 mm |
material | PMMA | |
Idle speed | 80 rpm | |
Energy source | heat generated by laptop power supply | |
Mass | 160g |
Description:
The issues with my first LDT engine did not discourage me from attempting to build a second one. Udo Mannek's book "Heißluftmotoren V" (Neckar-Verlag Villingen-Schwenningen; 1998 ISBN: 3-7883-066-1) contains a very clear drawing of the engine built by Mr. D. Schager. I had a ready supply of suitable material and began to design a smaller version of this engine. The bottom and top plates are made of 3 mm aluminum sheet. A flat rubber ring running in a groove secures the plates to the short acrylic cylinder. After a lot of trial and error, I finally managed to make a spring from copper wire that would compensate the weight of the dispacer pistons. The outcome does come up to my expectations: Although it does not run on my hand (see MM06), the engine will happily run for hours off the heat generated by a laptop computer power supply.
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