Search results
Results from the WOW.Com Content Network
The use of bevel gears allows the axis of the drive torque from the pedals to be turned through 90 degrees. The drive shaft then has another bevel gear near the rear wheel hub which meshes with a bevel gear on the hub where the rear sprocket would be on a conventional bike, and canceling out the first drive torque change of axis.
According to a study a human at 70 kg (150 lb) requires about 60 watts to walk at 5 km/h (3.1 mph) on firm and flat ground, [6] while according to a calculator at kreuzotter.de the same person and power output on an ordinary bicycle will travel at 15 km/h (9.3 mph), [7] so in these conditions the energy expenditure of cycling is about one-third ...
Most bikes have positive trail, though a few, such as the two-mass-skate bicycle and the Python Lowracer, have negative trail. [ 12 ] Trail is often cited as an important determinant of bicycle handling characteristics, [ 13 ] [ 14 ] and is sometimes listed in bicycle manufacturers' geometry data.
It can also be a challenge for touring bikes that carry a heavy load of gear over or even behind the rear wheel. [37] Mass over the rear wheel can be more easily controlled if it is lower than mass over the front wheel. [11] A bike is also an example of an inverted pendulum.
Augercast piles are not generally suited for use in contaminated soils, because of expensive waste disposal costs. In cases such as these, a displacement pile (like Olivier piles) may provide the cost efficiency of an augercast pile and minimal environmental impact. In ground containing obstructions or cobbles and boulders, augercast piles are ...
Hunting oscillation is a self-oscillation, usually unwanted, about an equilibrium. [1] The expression came into use in the 19th century and describes how a system "hunts" for equilibrium. [ 1 ] The expression is used to describe phenomena in such diverse fields as electronics, aviation, biology, and railway engineering.
One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...
Hunting equipment. Subcategories. This category has the following 8 subcategories, out of 8 total. B. Black-powder pistols (1 C, 42 P) C. Clubs (weapon) (5 C, 35 ...