IMO, compared to a composite shape, one could manufacture "the same shape" with a roto-, blow- or thermoform mould using the associated processes. These moulds (except for the thermoform mould) are expensive though compared to composite moulds and you need the corresponding machines. All three mould netshapes for thermoplastics would differ a bit from a composite mould in that they have to take into account the different shrinkage characteristics of the different processes and materials used > how to do that is normally well known these days and simulated via CAD/CAM. These processes deliver products for many industries that are often way more sophisticated than surfskis/kajaks when it comes to keep/achieve designed dimensions. In my opinion, for thermoplastics, thermoforming (Raptor) should be capable to deliver the most light weight skis paired with using highly stiff and impact resistant materials with best wall thickness control.
So why would one differ from the composite shapes when going thermoplastic?
For example, what I have read here, it was assumed that the V7 was made shorter than the V8 for weight reasons. Also, a more than double the weight for a tupperware vs. a composite could also mean than one would have to refine the hull shape to not have a completely detoriated behavior on the water compared to the underlying composite shape concept. For example, shorter also means more manouverable for a heavy boat, e.g. 510 PE vs. 520 FRP, V7 PE vs V8 FRP, etc. >> Just my thoughts.
All the thermoplastic models below seem to have gotten a shape refinement and are not
simple copies of a FRP-model (OK, except for the Spirit Fury maybe) IMO,
however, all carry a brand specified shape DNA or share
distinct shape concepts of the FRP models they relate to, imo:
FRP: Vajda Hawx 52, 553.5cm, 51.8cm, 15/11.5/9.5kg
TP: Vajda Raptor, 535cm, 53cm, 19.5 kg (I can confirm it), thermoformed ABS
A dealer said: "The Raptor is based on Vajda's hugely successful Hawx 52 shape."
In my opinion: "Ahem not really, look at the nose and chines"
FRP: Think Eze, 520cm, 51cm, 15.5/12.5/10.5kg
TP: Think Nitro / Piranha Octane, 518cm, 53cm, 20.8kg, rotomolded PE
A dealer said "Coming from the Eze, the Nitro ...".
Really?
FRP: Epic V8, 548cm, 54cm, 17.5/16/12.5/9.4kg
TP: Epic V7, 520cm, 54cm, a dealer's website says 23.7kg (fits as mine is 24kg)
A dealer said "Plastic version of the V8"
In my opinion, "No it's not simply that, despite all similarities".
FRP: Nelo 520, 520cm, 52cm 10.5/11.5/14.5kg
TP: Nelo 510, 510cm (I'd guess so), width?, 19kg (one will see), rotomolded PE (I'd guess so)
One will see.
However:
FRP: Spirit Fury, 566cm, 47 cm, 11kg
TP: Spirit Fury, 570cm, 47cm, molded weight 17.6kg (elite version), 19kg, rotomolded PE
First there was the PE Version, then they made a FRP Version, I think. Anyone can confirm that?