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This 21m2 tube is 6% lighter weight than a 21m2 foil
That right there is quite an achievement in itself
Not much to pump...3 struts + leading edge....2 1/2 minutes at most by hand pump to inflate
Deflating a big LW tube is quite faster than getting that huge amount of pillow air (1 psi).......
....trapped between the twinskins...and get it "all out" of those 2 small deflate velcro valves flaps
I did the test with my 19 Core vs SP3 21...i timed myself using both..tube wins overall
Setting up and "on water riding" with 19 tube = 5 min.....same thing with 21 foil filled up = 4 min
I can pump my 19 in 80 seconds at 6 psi
Packing down and leaving beach = 5 min.......same thing with 21 foil = 9 min.
9 minutes is a very long time especially when a thunderstorms is coming
The reason for using a large foil for LW is becoming virtually unnecessary in this day an age