speed tubes

[harpo]

Hello .
I have been assemble a futurs mk11 . I have a manual for it on how to put it together it also has a built in pressure gauge for the tubes . The thing is how much pressure do i put in the speed tubes and the tube in the bottom of the boat . It does not say in the book .
regards chris

[beerbelly]

the same as the main tubes only the floor is higher pressure everything else is 2.5 I think

[harpo]

thanks .
when using the gauge which fit the main tubes when thats green its got 5 psi in them ,
regards chris

[Peter_C]

Ironically my Futura Sport with speed tubes doesn't show a pressure on the transom for them, yet it does for the middle floor 2.2mb (3.1psi), and the main tubes at 2.4mb (3.4psi). I set the speed tubes to around 3-3.5psi as they never see the sun, but they do get to feel the cold water.

[harpo]

Thanks for you message the pressure is 3.4 main and 3.1 hull .
Regards chris