Forking is the expression for a split in approach, a new way taken up next to the research that goes along according to a previous plan.
Bram de Vries, one of the people I recently met through the contact with LHUMP thought different about a method to create the draft of air through the stove.
Demotech proposed the use of a Stirling engine. Such a machine could have a very low efficiency, as heat was plenty available in a stove, while the energy needed to drive the ventilator was but a little.

However Bram asked himself the question how to reach the same effect with even less moving parts. Today he came over to our workshop to discuss and demonstrate his ideas.
He started experimenting with a tin can functioning as a vessel to heat up air. Over this vessel a rubber membrane is attached with an air valve in the middle. This valve should switch at reaching the top and the bottom of its stroke, thus creating a draft by sucking air in and pushing air out.
Bram realizes his forking concentrates on a mechanical train of thoughts. Next step is to discuss it with people who can make a proper calculation, as the expansion of air by heat can be properly calculated. To inspire these people he plans to make in his kitchen at home a new set up, clarifying his idea better. Such a contraption could even shown a first sign of life!