Hi Wouter
Sorry if you think I give the wrong impression on the HC17. I wrote about my experience sailling it.
Concering the weight. According to the specs at http://www.nahca.org/hobies/hobie17_specifications.htm#Top the max load of the wings are 350 lbs.= 158 kg, which could be the weight of 2 persons. I admit: It is not stated anywere that it is intended to be doublehanded!

Concerning the volume: It was compared to the HC16, which was mentioned alot in the tread prior to my input. Sorry for not stating that clearly

And yes I have sailed it doublehanded,- with my wife being pregnant in 3rd month.

Finally I appreciate the different inputs. That's what make this site so great.