ive just bought a 2014 Blade 4.5, it recommends rigging on a 370 mast and it says a 400 mast can also be used, but the head isn't adjustable. Any ideas?

Example:
370 + extension 34

400 + extension 4cm

Pretty simple really

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russh said..
Example:
370 + extension 34

400 + extension 4cm

Pretty simple really

I think it's 370 + 32. My chinook extension only goes down to 10.

I take the chinook collar off completely and it sits on the curve / cone shape.

Its abouit as close as you get - alternative is a maybe a severne zero extension

Like this?

Yep - thats what I do - dont know if it adds any extra pressure around base of mast / adversely effects things but that's the way I have been rigging my 4.5 2015 blade for past 6 months and haven't had an issue - using a gorilla 400 & Powerex 400 - 97 carbon.

Someone with a bit more carbon mast knowledge may say use a flat collar without the pin to prevent damage

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russh said...
Yep - thats what I do - dont know if it adds any extra pressure around base of mast / adversely effects things but that's the way I have been rigging my 4.5 2015 blade for past 6 months and haven't had an issue - using a gorilla 400 & Powerex 400 - 97 carbon.

Someone with a bit more carbon mast knowledge may say use a flat collar without the pin to prevent damage

Yeah I thought this was a no no, but could be wrong.

I'd not do it.....driving a wedge up something that sometimes splits at the bottom anyway.....
Make a washer out of a bit of stainless or ally to sit on the taper first would be a lot safer and you will only lose a few mm

yeah I think I'll get a zero base extension instead. Sailed Margs yesterday completly over powered on my 5 as I couldn't use my 4.5..

I've just bought the exact same sail and used it first time last week.
Rigs on a 400 Gorilla mast with a severne grenade ext at 4 with no probs.
Sweet sail, nice and light but with plenty of grunt