[TR] 6 cyl plastic cooling fan - yellow or blue for best air flow?

[aribert neumann]

Greetings all:

My '71 GT6 came w/ an 8 bladed yellow (off white) cooling fan.  I bought a
2.5L TR6 engine, from a '73 TVR, that came w/ a 13 bladed blue cooling fan.
  The blue fan has a larger hub / shorter blades.  Any idea as to which fan
draws the most air thru a radiator?   TIA - off in digest mode awaiting
your responses.
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