Velocity stacks ?

[JohnZissler@aol.com]

Hi All, 
          Can someone put me in the picture please.......
               What on earth is a Velocity Stack ?

Happy Spitting..................John  (In the UK)

Spitfire MkII in bits. (Others call it restoration)
Spitfire Chassis MkIV (awaiting a spot of welding) I am nearly a collector 
!!!!!!!
Spitfire Mk III (for spares)   I 'am' a collector !!!!!!

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