Well what was your top speed on a landboard??
Mine 40.5mph (GPS)

Board:
13ply Trampa with skate trucks

Kite:
7m Frenzy

My top speed is like 39.7 mph
on a Landyachtz urban assault
skateboard with seismic trucks
and 110mm Abec wheels
on cement
the kite was likely the 2m ozone samurai 1
in super high winds

50.9 mph GPS'ed out at Ivanpah

Dirtsurfer 16" Flexi Freestyle and a Kitewing Rage 5.5 in about 30+ winds.

I have a video of me hitting 49.something a few weeks later on the same board with a Kitewing IV8. I was towing a rider on a dirtsurfer behind me in about 35+ winds. We headed upwind for as long as I could manage and then we peeled off on a far reach. He let go off the tow rope and I slingshoted downind incredibley fast. What a ride that was, I gained 25 mph in the blink of an eye

On a dirt surfer you crazy fool!!!!!

Never tried one but seem really unstable???

WOW - - That is just nuts going that fast on something standing up. I can just picture hitting something, anything, and going over forward. Maybe its just because I am close to 40 and don't heal as fast. I'll leave those speeds to guys that are much younger and way more guts than I do.

Not once at 50 did I feel unstable or out of control. Speed=stability on a dirtsurfer. I'd be more scared to ride those speeds on a 4 wheel board

Top speed for me so far is 62mph (Garmin e-Trex venture gps) on the Ivanpah buggy at Ivanpah about 3 weeks ago. Looking to go faster!

51.7mph on skis is my personal best.

I've only been up to 28 mph with my Dirtsurfer and that is fast enough for me

29.1 on skis 51.1on buggy ,backwards 25mph sweet but not as good as ziggy.had a wicked good time at nabx this year.dirty buffet gang lives on

48.7 mph on sand on a Dirtsurfer with Kitewing - here's what it looked like

http://www.vimeo.com/1108127

This next one is just 40mph but it shows how stable a dirtsurfer is.

http://www.vimeo.com/1070323

dirtsurfers have an advantage: Gyroscopic force , with a bigger wheel and being inline like a bicycle or motorcycle. You gain the benifit of gyroscopic force , the faster you go the more it wants to stay in a plane 90 degrees to its axis. so you get the opposite of speed wobble. I don't have one but they look cool.Is it hard to carve at high speed?

i have no idea, but have easily hawked the beach patrol down and they cruise about 25mph in the open. really hard to judge. i don't have a GPS. 12m kite and 15-20mph on a MBS core 16. i would assume maybe 25-30mph. i may have hit forty a few times but hard to say. i knew more by distance a 2 mile stretch, with dead onshore, i can return to my pack in less than 5min. maybe even less. i really haven't paid that much attention to it. higher winds usually puts me on the water.

what GPS would be a good start and waterproof too?