The advantages of stretched frames for me are:
Lower center of mass = more stability, less drag.
Longer wheelbase = more momentum.
Being able to easily get my feet on the ground.
More comfortable placement of pressure-points.
Being a longboard-skateboarder, i like the feeling of steering with my weight.
That said, you cant use your weight to pedal, because you cant stand
on them, so all the propulsion has to came from your legs.
A backrest could be an advantage.
Heres a few of mine:
I built them lightweight for speed and function, both are 3spd nexus,
nmbr2 is my daily ride on the streets of Amsterdam,
It is fast accelerates great and i have driven it for a lot of km a
day without problems.
A short history of stretching bicycles:
H. Jarvis 1902:
1932 Mochet Velocar
Modele Sport Recumbent Prototype
On the 7th of July 1933 Francis Faure rode a velocar 45.055 km (27.9 miles) in one hour on a Paris velodrome and thereby smashed the almost 20 year old record by Oscar Egg.
The following rules would be in effect in UCI (Union Cycliste International) sanctioned racing from after that point in history on:
- The bottom bracket had to be between 24 and 30 centimeters above the ground.
- The front of the saddle could only be 12 centimeters behind the bottom bracket.
- The distance from the bottom bracket to the axle of the front wheel had to be between 58 and 75 centimeters.
In other words:
The geometry of racingbicycles is not based on effectiveness,
but on rules set almost a century ago by persons who had an interest
in maintaining their standard.
Its funny that some people get almost angry when confronted with
these facts, and it is a bit of a pity that innovation of and research into
the effectiveness of frame-geometry has halted ever since.
https://www.youtube.com/watch?x-yt-...03534&feature=player_detailpage&v=l_tXuvsfuEU
http://www.helsinki.fi/~tlinden/winforb.html
http://www.oldbike.eu/museum/1930s/...elo-velocar-modele-sport-recumbent-prototype/
http://www.recumbents.com/wisil/misc/velocar.htm
https://quarterlybicycle.wordpress.com/2013/04/30/charles-mochet-and-the-velo-velocar/