Last week I paddled the Greenlander in my weekly trip to the club on wednesday-evening.
I was a bit surprised on that occasion because I got the impression she was fast and effortless paddled.
Ofcourse, after a holiday of 2 weeks paddling at sea, it could be that I was in good shape. But as our holiday-paddling-pace was rather relaxed, it could well be that it is not in my shape but all in the Greenlander herself.
So yesterday I took the Greenlader again with me, but now I was accompanied by a GPS for measuring speed.
There was almost no wind, no waves and I started with about 8,5 km/h on shallow water.
Entering deeper water, while reaching the Zaan, this increased a bit and I ended up paddling between 9,0-9,5 km/h.
Quite fast to my opinion because the Greenlander has a hard-chine hull-shape. This type of hull has a greater wet-surface than a more rounded one and therefor I don't (excuse me: didn't) expect a hardchine hull to be fast. Certainly not because the AnasAcuta, also hardchine, is not fast at all.
Anyhow I could paddle effortless at this speed during the first 5 km of the trip to the club.
Than something strange happens. With another 4 kilometer to go I was experimenting a bit with my paddlestrokes and thanI discovered something that suddenly speeds up the kayak to 10km/h. Amazing! 
The stroke felt a bit awkward because I pushed the blades at the end of a stroke a bit down and outwards. This results in a very silent stroke being a bit shorter, without any tjoemp-tjoemp-noises and giving the illusion of a big spring between the blade and the water while the blade exits the water.
Because I could not relax my fingers while doing this, I tried to reproduce this for the next kilometers trying to integrate it fluently into my paddlingstyle.
I succeeded more or less in this and now my speed varied between 9,5-10,0km/h. Amazing: again.
And the paddle? It gave me the feeling that it was dancing in my hands, making no noise any more.
And the Greenlander? This being all about her: she did not give any sign that she was near to her maximum hull-speed.
Later, when I am fresh again, I will do some sprinting to get an impression where the maximum is.
After socializing at the club I started my return-trip and during the first half of the distance I could reproduce a 9,5-9.8 km/h; now having to work harder being a bit tired.
Later, when a ligth head-wind started, my speed dropped a bit to 8,9-9,2 km/h, rapidly increasing again when sheltered for the wind.
So at the end of the day I concluded that the Greenlander is fast, making an average speed of 9,5km/h possible.
During this trip, under calm conditions, I didn't pay any attention to any other characteristics of the Greenlander than speed. Later more on this.
Only one thing attracted my attention: while edging the Greenlander under these "very-flatwater-conditions" made her react very responsive in making turns.