On 03/07/2019 11:50, Bill wrote:
Where I suspected a resonant frequency of the DMF flywheel masses and
springs, the effect was - for example - when waiting to turn right
across traffic, a gap appears and you let the clutch in sharply, there
is a bang and the engine stops dead. I wonder if there is some damping
on the springs which can fail.

Sounds like not enough revs and a too-light flywheel.
DMF is probably a good idea - like IRS - if done properly. I.e. not
swinging rear axles...I suspect the springs masses and damping need
careful tuning and more development that they have in fact had...


--
"In our post-modern world, climate science is not powerful because it is
true: it is true because it is powerful."

Lucas Bergkamp