Roycroft Trophy 2013

[AMCO72]

Thank you Nodiff for your explanation. However I need someone, you perhaps, to explain it further to a dummy like me.

You see I always thought that was the object of a variable throat carburettor like the SU, to maintain velocity over the jet, so why would you need to complicate the issue by adding another smaller carb to help at low engine speeds ? With the blower increasing the flow anyway from low revs, and the fact that this is a race car where things other than air/ fuel flow are a factor......camshaft design etc, to low engine revs, one has to ask.....what is the point?
Or was it Mr Green thinking outside the square again.