I've heard the "grass, snow, water" wrt to wheel-less full-lotus floats, but it always seems to be in reference to landing. What about takeoff? I'm evaluating fitting them to a pusher trike (airborne 582 xt 2 seater) with MTOW ~1000lbs. I wouldn't feel to bad about losing pavement capability, but not being able to takeoff from grass would be a real bummer.

It’s all about power available, weight, and surface friction.

If you can find a really smooth turf surface, wet it down thoroughly, and maybe have a little help to start you moving (break that initial surface friction), it MAY work.

Frankly, a better bet would be a trailer launch.

MTV

We did 185's and Beavers off the grass with great success. We took a line with a very small eye in the end and slipped that end over the point on the backside of the bow cleat, ran the other end to a pickup with an automatic transmission and away we went. The instant there was any slack in the line, it slipped off the back of the cleat. Worked great quite a few times.
We did the trailer ride too, but I was more comfortable with a dolly than that, but we all preferred the line.

John

Lots and lots of KY jelly.

I've been doing a fair bit of e fat bike riding, with a ski fitted to the front, not to mention ski flying. As the snow starts to go on the terrain I ride/fly, it's always a bit surprising to me how well the skis tolerate the occasional bare ground spot. Just a little moisture seems to be the key, even a light frost makes a huge difference. On the other hand, when I taxi up my ramp to the hangar, onto dry concrete, there is no give at give, so, duhhh, avoid dry concrete.