Records of recumbent designs go back to the early days of cycling, however recumbent use was not widespread until the late 20th century. Recumbent riders hold world speed records for unpaced, human-powered vehicles. Tricycles form a substantial part of the recumbent market (far more so than they do for uprights); the generic term "bike" tends to be applied to these as well.
I have found a great website for Recumbent Riders called BentRiderOnline. Check it out for recumbent knowledge.
Here are some good Recumbent Links for you to have a look at:
Recumbent bicycle - Wikipedia, the free encyclopedia
As with upright bicycles, most recumbents are rear wheel drive. However, due to the proximity of the crank to the front wheel, front wheel drive (FWD) can be an option, and it allows for a much shorter chain. One style requires the chain to twist slightly to allow for steering, Another style, Pivoting-boom FWD (PBFWD), has the crankset connected to and moving with the front fork. In addition to the much shorter chain, the advantages to PBFWD are use of a larger front wheel for lower
rolling resistance without heel strike (you can pedal while turning) and use of the upper body when sprinting or climbing. The main disadvantage to all FWD designs is "wheelspin" when climbing steep hills covered with loose gravel, wet grass, etc. This mainly affects off-road riders, and can be ameliorated by shifting the weight forward, applying steady pressure to the pedals, and using tires with more aggressive tread. Another disadvantage of PBFWD for some riders is a slightly longer "learning curve" due to adaptation to the pedal-steer effect (forces applied to the pedal can actually steer the bike). Beginner riders tend to swerve along a serpentine path until they adapt a balanced pedal motion. After adaptation, a PBFWD recumbent can be ridden in as straight a line as any other bike, and can even be steered accurately with the feet only. Examples of PBFWD recumbents include Cruzbike, Flevo Bike, and Python Lowracer.
Modern recumbent bikes are increasingly being fitted with front and rear suspension systems for increased comfort and traction on rough surfaces. Coil, elastomer, and air-sprung suspension systems have all been used on recumbent bikes, with oil or air-damping in the forks and rear shock absorbers. The maturation of fully-suspended conventional mountain bikes has aided the development of these designs, which often use many of the same parts, suitably modified for recumbent use.
Starting, Looking Behind and Stopping on a Bent - Because the body position does not allow the rider to push the recumbent bike forward using his feet against the ground, the bikes can be a bit challenging at first. Looking over the shoulder at the riders behind you can be dangerous as it may draw your bike off the trail. There are quite a number of safety concerns when first taking on recumbent riding. All are learnable and just take time to get used to. Some Bent riders mount a small flag pole to the rear of their bikes to attract visual attention from oncoming bikers since the bent is lower to the ground. ...
Recumbent Bicycles, Bents, Trikes, Hpv!
Cycle America resource site featuring adult tricycles, three and four wheelers, dealers, streamliners, fairings, windscreens, recliners, laid back bicycles.
Why Ride Recumbent by Cycle America the NBG in Action
And the renewed interest these bikes are enjoying is far more than just about speed. Besides the fact that recumbents also hold the one hour and 4000 meter ...
Recumbent Bike Riders: Recumbent Bikes | Recumbent Trikes ...
Recumbent Bike Riders offers recumbent bikes and trikes including recumbents from Bacchetta, Catrike, WizWheelz, Optima, RANS, Challenge, Tri-Sled, ...
RANS Recumbent Bicycles
Offers a full line or recumbent bicycles to suit a wide spectrum of riding needs.