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airsail said..
Hi JB, Is the new HM mast a worthwhile upgrade over the S27 100% carbon for use with the HA range of wings?
Hey airsail,
It's never as black and white as that, but in essence = YES!
I will try elaborate a little more so it is easy to understand from my point on view.
The S27 C100 mast is very nice and plenty stiff. The S28 added/changed some of the UD carbon layup and did achieve a slight stiffness increase, it is minimal but noticeable on larger foils. If is owned either of these masts and wasn't using the larger span foils majority of my time (over 100cm), then I would think I'd prioritize other items first as far as need for upgrade (like a new HA2 or Ultra Jet etc...). This said, if money wasn't really an issue and I had my foils up to date (fronts and rears) I would most definitely recommend upgrading the HM mast, again more so on the larger span foils, the HM is a very noticeable stiffness increase. The biggest difference between the S28 C100 and the 2024 HM Masts is in the torsional stiffness! Whilst the side bend is most definitely also stiffer on the HM, the torsional stiffness is pretty incredible. It is probably on fractional percentages but you can definitely feel it immediately.
When it comes down to it, I have come to the realisation that in most instances when you're paying for masts, the price reflects the materials used, and the better the materials, generally the better stiffness control (also a lot is design for sure, especially in torsional control). But this reflects with Naish' range. The S27/28 Alloy mast is excellent for the $$$. It is actually quite stiff side ways, but where you notice it (and this is across all alloy masts) is torsionally, this is normally what you're noticing when comparing to a composite mast. The Alloy mast structure work amazing in lineal front to back stiffness, and the section and "I" beaming make for great perpendicular bend stiffness, but the material limitation is in the twist/torsion. This is why going thicker but with the same amount of material creates a radically torsionally stiffer mast, but at the cost of drag and weight. When we step to our C35 and C55 masts which are composites using 35% and 55% carbon, they have great stiffness, comparable to the alloy in side bend, but more life and faster reaction than the alloy. Then going to C100 takes everything up a notch. Greater side stiffness and significantly more torsional stiffness than the C35 and C55 (and likewise the Alloy). But like in all things, the cost is somewhat reflective of what you get. Personally I would prefer have and Alloy mast and buy more front wings and tails first. I also like the 65cm option in Alloy which is nice and stiff (as the alloy masts are stiffer in the shorter sizes). Given the choice now, if I was on an alloy and had my foils up to date adn the money for the next step, I would likely go straight to HM (knowing what I know), I can not imagine anyone being disappointed in going HM so long as they can afford it and did not go without to do so.
A very long winded and cryptic answer, sorry, probably lost it in there somewhere

, but in simple, yes it is worth it

I can not go back now!
Ride safe,
JB