By W. E. Johns
A lifeless murmur, like far away thunder, reached their ears and taken Biggles to his ft with a hurry. 'What is it?' he gasped.-At the 1st sound Dickpa had leapt for the flashlight. 'Quick,' he snapped, because the flooring of the cave sagged sickeningly. 'Get out - it's an earthquake! Ah - stop!' he screamed. a trip to Biggles' uncle, Dickpa, lands Biggles, Algy and mechanic Smyth in a deadly experience trying to find an historic Inca treasure hoard.
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Extra resources for Biggles and Cruise of the Condor
They are five times longer than they are wide). Round spokes on non-disc wheels have also been replaced by ovalized aero spokes. The reasoning behind using airfoil sections for spokes and frame elements is understood by considering how air flows around these shapes. A round cylinder creates a turbulent wake with a trailing low-pressure region that generates high drag. The coefficient of drag (see the equation of motion) for such a cylinder is 1 . 2 . An ovalized airfoil section in an air stream creates a smooth surface over which the air flows, without turbulence.
H-1). Many bicycle components, such as cables, water-bottle cages and seat rails, resemble pencil-like shapes. 9 BIOMECHANICS Standard double-diamond frame u Hotta TT Lotus SDOft Australian Superbike US Superbike I I Fig. 21 Various bicycle frame configurations designed for time-trial events. Aerodynamic superbikes attempt to (i) minimize the number of times the air stream crosses frame structural elements; [ii)limit drag-producing interactions between the air stream, the frame and the rider’s legs; and (iii) incorporate smooth transitions between frame elements.
Sharp in a book entitled Bicycles and Tricycles. However, it was not until 70 years later that this subject was reported again. Subsequently, results of a two-dimensional force pedal analysis were presented in numerous studies and all follow the same pattern presented in Fig. 8(a). As observed in Fig. 8(a), peak force perpendicular to the pedal surface (Fz) is approximately 350 N o r 60% of the subject’s body weight. This percentage is about the same for all seated cycling under steady-state conditions.