Lehmann engine, second attempt. This time, I again intended to achieve
transparency and a bigger accordance with the original engine. The water cooling
is realized by a closed jacket surrounding the displacer cylinder completely. Both parts are
joined by screwing at the rear end, and at the front they are sealed by an
embedded rubber ring. The big acrylic parts requiered special care during processing. Although I had annealed all parts
before gluing, some tiny tension cracks appeared. For mounting the engine
I used a special glue named ACRIFIX (available at Opitec).
"Heißluftmotoren VI", by Udo Mannek;
(Neckar-Verlag Villingen-Schwenningen; 2000 ISBN: 3-7883-0667-x)