Are tandems really more efficient than regular bikes (continued)?

A triplet bike is lighter and has less resistance per person, so is more efficient than a tandem, which is more efficient than a regular bike. Does this trend hold however long the bike? (continued)

Hilary Johnston, Perth, Western Australia

At a cycling event in Perth 30 years ago, a group of men brought out a 10-seater bike.

Despite much sprinting with the bike to gain enough speed to jump on and start pedalling, the men never successfully rode it because the minimum speed to maintain balance couldn’t be reached. It proved impossible to keep the centre of gravity under…