About the Tandem Calculation:
The values of "Rider's Height", "Rider's Weight" and "Power" refer to just one of the tandem riders. If Captain and Stoker differ in any of these values, take the mean value of the couple. (The program will internally multiply the given values by 2 .)
Adequately, if calculating the power the program will deliver the mean value of the two persons, i. e. the half of the added total input power.
The type of tandem the calculation is based on:
Cannondale Aluminum frame. High performance equipment. 28 inch wheels. Equipped with lightweight mudguards and carrier, total weight is 39.2 lb (17.8 kg). Quite big timing rings (40 teeth) to reduce chain friction losses. Racing handle bars for Captain and Stoker. Riding position: hands on the drops (bottom section of the handle bars) front and rear, the upper part of the riders' bodies not being extremely bent, about 40 degrees to the ground.
 In reality, the total frontal area of a tandem riding team is not twice that of a single rider. The program's algorithm regards this fact.