The materials are the same as use on catamarans, but the frame it is mounted on is not as stiff and can not be tensioned like a catamaran trampoline. Regardless of a bit of sag... these are light weight, comfortable and large unlike the Hakas I have seen described in the forums.
Matt you didn't think that comment would be left alone did you?
so by inference the hakas are heavy, uncomfortable and small. Well, having built some hakas I do agree that they are heavier than tramps, but from a comfort level hakas are definitely more comfortable as they get your rear end up out of the " car wash" that's the main discomfort with tramps - that constant wetness - its a ton of fun when you first get them and then that wears off (when your clothes are dry)
, however hakas don't need to be tensioned and re-tensioned, they are very quick and simple to install compared to tramps, hakas can actually cost about half the price of tramps to build yourself, hakas allow a better hiking out experience and hakas are far more useful for lashing down any gear. Hakas also provide a more stable surface if you need to stand to move around the boat, as in landing at a dock - I know I have tried standing up on the trampolines and true to their name got bounced around the boat. And small? yes hakas generally cover a smaller surface area but they also usually extend forward and aft of the AKAs making the boat more versatile in creating load balance. And perhaps the most redeeming feature of hakas over trampolines is safety - hakas won't act like a sail and de-stabilize the boat under harder conditions. I was out in the water this last weekend with my trampolines on when the wind came up to 20-25knots - had the sail reefed in 60% and sailing with the wind at my beam and the biggest tipping force was being applied to the tramp when coming over a wave . Now, that's not to say trampolines are not good - they are great and if you have kids they will just love them. Also great for pets. I use them myself but I just wanted to bring a little balance to the comparison between tramps and hakas
Life is the Journey - not the Destination