I originally built this unicycle to ride in my 24 Hour World Record event, but unfortunately Guinness does not allow custom equipment, so it has to sit on the sidelines. The V-unicycle was made by Anders Waiker for C3 cycles, a custom frame builder who also built my C3 stainless racer,  I talked about this years ago on the unicycle forums, but others made the leap well before me, so I’m playing catchup!
The idea with a V-frame is that it allows the rider to distribute their weight like a bicycle, which means a less upright position, less saddle soreness, and greater power.   For distance riding, most riders use long extension handlebars to achieve this, but it is not the greatest engineering design, as there is nothing to brace the bar.  Luckily, for my 24 Hour Record attempt, the Mad4One handle-saddle is sufficiently stiff that I can use the TT position without any flex.  However there is minimal adjustability and the cockpit is very narrow.  Here is a comparison of the two setups:

My v-frame is made from cromoly steel with fillet brazed joints.  The small diameter tube resulted in some flex, so we brazed a second set of tubes to stiffen things up.   There is a steel tube which sits in the front fork. This can be moved up or down to adjust handlebar height.  Likewise, I’m using a regular bicycle stem which means some adjustability in terms of reach. 
I omitted disc brake tabs- it’s not something I use unless on a geared unicycle or riding off-road.  This is purely for time-trialing!  Finished off with a bright yellow paint job and it looks as fast as it rides. 

It takes a while to get used to the TT-position, but once you’re familiar, it allows you to pull on the bars for power, and steer by weighting the arms.   The balance axis is quite different to a regular unicycle, but similar to my 24hr world record unicycle with Mad4One Handle-saddle with URSLI extension bar.  It takes a few rides to get used to free mounting and going over bumps.  Once this ‘clicks’ into the brain, the TT position is comfortable and very fast.  This years’ unicon 54km road race was won on a V-frame, so there has to be an advantage!
Overall weight is slightly higher than a single fork unicycle, but it’s not noticeable.  The stability and adjustability of the riding position more than makes up for this. 
I’m disappointed it can’t be used for my 24 Hour record attempt, but I will be training on this unicycle and you may well see me at the next Unicon on board a V-frame. 

For more pics, here is the full Flickr album