Hanging ebike from saddle.

Unlikely, I think the heaviest ebike is still lighter than the lightest rider. Is it just a tension load you plan on applying, or will there be a bending moment as well? Even if there is, got to be less bending moment than a rider bouncing up and down on it.

A fully extended dropper?  I wouldn’t give it a second thought.

I think you'll be fine. I wince when putting my ebike in the stand via the dropper with all that weight acting as a lever but it's never been a problem. As other people say humans are heavier than the weight of the bike.

Human weight is downwards pressure. Hanging it by the saddle is is pulling it upwards and levering it at full extension for a very long period. Not saying it won't work, but its not the same thing.

Human weight is downwards pressure

Its not. There is an positive axial component but also lateral. Unless your seatpost is vertical?

Hanging from the saddle loosely ie it find its own balance puts no lever arm through dropper portion. If its up fully ie resting on the stop what damage can be done.

I think. Certainly nothing big.

Its not. There is an positive axial component but also lateral. Unless your seatpost is vertical?

Thats quite nitpicky. OK predominantly down then. When you sit on a post your weight pushes it down. Hanging it by its seat is pulling it up.

Thats quite nitpicky

Yes, but its not the "up and down" forces that are going to cause problems its the lateral loads that add a bending moment that will do weird stuff.

Which a very present when the saddle crashes up your bum hole on a cased landing and not present when hanging from the saddle. When the saddle is up the forces are taken by the part of the dropper that stops the stanchion flying out, you are not imparting a long term pressure on something that may suffer. Its essentially a rigid post when fully extended and being "pulled" you aren't changing what is happening internally or introducing a long term loads that the dropper isn't designed for.

Possibly, yes. But the collar that (in part) stops the post popping out the top may be designed to take the force of the internal max psi . It may not be designed to hold max psi plus 25kg.

It may be totally fine and designed for way more than this, but my point was that saying it can take the weight of a human (pushing down on air pressure) is not the same thing as loading the collar at max pressure plus bike weight.

You also don't ride a bike 24 hours a day, 7 days a week.

Would I hang a heavy bike from the saddle for a few hours (with the dropper extended)? A few days? For sure.

Would I store my bike that that all the time? For months/years? No, I'd be worried about wobbly keys, and squished travel reducers.

Not sure on exact scenario (*but I’m gentle with my dropper) so could you just put a strap etc round the frame and use that.

ignore the bickering. The answer is "No"

Assuming the saddle is in good condition and attached properly to the seatpost it'll absolutely fine to suspend the heavy Ebike from the saddle be

As will suspending the bike in a workstand clamped around the dropper post's stanchion

Just make sure the dropper is fully extended before hanging/clamping the bike.