In article said:I was wondering if anyone has seen or ridden a Varna Recumbent -
varnahandcycles.comcycle.htmOpen ↗ Recumbent
The design is striking. The wheelbase is so short that it appears as if a 'comfort bike' handlebar
has been directly attached to the front fork - surely the most elegantly simple USS ever devised.
There are several bikes with this form of USS:
Turner Vision The late, unlamented Blackbent The Hypercycle (possibly the first "modern" SWB?)
HPVelo Street machine (I think) Probably others as well.
Electing to do this type of USS carries with it many consequences, not least of which is an extreme
forward weight bias. So much of your body mass (everything from your upper thighs down) is ahead of
the headset that the front tire gets very heavily loaded. This has interesting handling
implications.
The only one of these bikes I've ridden is the Vision R40, in its original form. I really didn't
like it... I felt as if I could actually do a stoppie on it if I tried (opposite of a wheelie, where
you stand the bike on its front tire).
I note that soon after I rode that bike, Vision changed the design and (I think) lengthened the
wheelbase. I do know that they altered the bike to improve the handling... exactly what they did
escapes me at the moment.
By all accounts, the Hypercycle (which had a wheelbase of something like 36 inches!) was a
real handful.
If you do USS like that and move the headset forward to get a better weight distribution, you wind
up having to offset the handlebar with a stem... which means that when you turn, the handlebar moves
side to side as well as pivoting. Which means you need to make the bar wide enough that your hands
won't run into your hips as you turn. Which splays your arms way out, which is decidedly
un-aerodynamic.
The designer could also do a fork with extreme rake and a very shallow head tube angle to get the
front wheel out farther, but then you could wind up with a lot of fork flop which, given the forward
weight bias inherent in the SWB configuration, could make the handling (especially at low speeds)
questionable. This is what Rotator does with the Pursuit, only the reason for it on that bike is
different: The Pursuit is a LWB, and it's done to get the handlebar back where the rider can reach
it without having a lot of tiller.
I'm not saying that all of these things WILL happen and cannot be dealt with by proper design, but
they certainly can happen.
I have no experience with the Varna Recumbent. Perhaps Georgi has designed a superb machine; he's
certainly capable of it. But that bike has been around for years, and it's not exactly taking the
world by storm.
I'm not quite sure where you're coming from with your "model of simplicity" statement. The bike
doesn't look any simpler than many of the others I've ridden.