Now I have 3 engine variants and I can't decide which one is best. Time for a Poll >>>
EDIT: I'm interested in which of the three basic designs you prefer. None of these engines is finished (especially C which has no surface detail and just pen lines to indicate an air intake!). If you've already voted and want to change your vote, then do so. Thanks.
Comparison shots alongside.
Left to right - engines A,B and C.