I wish I had had the chance when I was young. I am quite sure I would have taken to it.
Every unicyclist needs another uni.
The Australian UDC does that too and even got me in a 27.2 x 400 mm Nimbus seatpost I saw on the UK UDC. They brought in a few and now they are in stock here. No extra charges either.
I haven’t searched the proper thread about it so I will answer from memory.
Seems like such kind of seatpost are not designed for lateral forces as applied on a uni when it hits the ground. For a seatpost costing a couple of hundreds of $, it may be frustrating…
And on top of that, you will need to source a KH rail adaper or a Qu-ax rail saddle + you will have to have somewhere to put the adjustment throttle (so either under the saddle on a brake mount or on a handlebar).
I don’t really know if somebody really tested one or if it was educated guesses. It will still be a decent budget for a paperweight (if it ends up broken…).
I have used a couple of different dropper seatposts on bikes. The problem is fitting the inside trickery into a skinny 27.2mm post, meaning the actual sliding part is well under an inch. It’s hard to make it strong enough while not being overly heavy. That’s why the benchmark, the rockshox reverb, is only available in 30.9mm and 31.8mm. There are a few available in 27.2, but none in 25.4.
Also, they are very sensitive to seat clamp torque. Nip it up even a quarter turn too much & it just won’t slide properly.
I doubt they’d stand up to the abuse a uni seat gets. It’d be good if they did, but as with many things, uni is just too small a market for companies to put the money into development costs.
I guess that’s why we have qr seat clamps!
Strength is certainly a problem with dropper seatposts for unicyclists. The torsional twist on a unicycle is dramatically greater than you get on a bike and it would not be greatly practical. QR seatclamps especially the double quickrelease ones work well.