brad1 said...
ok now let's talk about the differrence between Np X3 and X6, lets say180-230cm
both the same diameter, however the X6 is 100g heavier. Personally I just don't see the point of the hybrid assembly. If you want stiffness go for all carbon. From an engineering point of view I really can't see that the tail piece in carbon is going to offer much, if any more stiffness, I think it's just a nice piece of marketing. To get picky one really needs to mount both booms to a bench and load test them, or can anyone verify the difference in feel?
I've not used the pryde's but can comment on the prolimit hybrid vs standard. The hybrid is an improvement but I feel this is mainly noted by heavier sailors who notice less draft movement in gusts, so unless you sail quite powered up you wont notice a great deal between the two. Personally I have quite a few booms, but generally if I go over the half way point on the extension I will use a carbon back end. Looking at my carbon, hybrid and alu booms when sailing it isn't so much the back end that bends rather the rear of the front section, the carbon backend reinforces that area better. But yes beefing up one part such as using stiff carbon extension tubes moves the weak spot to either the aluminium arms or the bend in the carbon back end.
For the prolimits the carbon backends also have the pulley system set up for adjustable outhaul whereas the standard aren't suitable.
I don't know about those booms from Italy, there are a few design features which point towards a stiffer boom, most of these can be seen on the Mauisails carbons:
Backend- as said above alot of flex occurs at the bend point, this is reduced by widening the curve or going to a reinforced non-curved section such as the mauis.
Main section tubes- stiffened by thicker tubes, larger diameter tubes or elongated tubes.
Front end- monocoque, wider more progressive curve.
The italian booms feature a few of these and do look good, but I don't know whether they would be more durable than other booms. Dunky doesn't sail formula and that is where I would be looking to see which booms last.