Dive brakes are meant to slow down an aircraft when in a dive. They usually consist of a metal part that is raised against the air flow, thus creating drag and slowing the aircraft. For a solid object moving through a fluid or gas, drag is the sum of all the aerodynamic or hydrodynamic forces in the direction of the external fluid flow. ...
They were mostly used on dive bombers, which needed to slow down in order to achieve some accuracy. With the disappearance of dive bombers, dive brakes have disappeared. However, most modern combat aircraft are equipped with air brakes, which are nearly identical in design. A dive bomber is a bomber aircraft that dives directly at its targets in order to provide greater accuracy. ... In aeronautics air brakes are a type of flight control used on aircraft to reduce speed during landing. ...
Dive tables are used to determine how long you can safely stay under water at a given depth, both for the initial dive and for subsequent dives.
All of that led to the "dive tables" that were first used by the Navy, and then, as recreational scuba diving became popular, modified for recreational use.
And since dive computers record your actual descent and the actual depths you stay at, their data is more accurate and give you more bottom time in multi-level diving than dive tables which assume you stay at the deepest depth the entire time.
This rake means that the braking force on the front tyre is split into two components when fed into the forks, one is in line with the sliders and hence tends to compress the springs (this force is approximately 42% of the braking force, for a rake angle of 25 deg.
The brake caliper is fitted to a floating bracket which pivots on a bush or bearing around the wheel spindle, the free end of this bracket is prevented from rotating by a pivoted rod usually fixed at it's upper end to the bottom triple clamp.
When the brake is applied the caliper bracket tries to rotate in the same direction as the wheel, but this is prevented by the rod which in turn pushes up under the fork yolk, thus acting in opposition to the diving tendency.
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