Roland, on 23 December 2013 - 10:17 PM, said:
Bipedal movement doesn't have the same restrictions that wheeled movement does... that's generally why you would want to have legs instead of wheels.
The chief difference is that legs are able to direct force at different angles, instead of perpendicular to the ground's surface. This is how you're able to do stuff like shuttle runs.
The chief difference is that legs are able to direct force at different angles, instead of perpendicular to the ground's surface. This is how you're able to do stuff like shuttle runs.
For rapid accel/decal in short bursts of accel/decal, yeah. Legs are not so good for trying to hit higher top speeds, or sustained acceleration. Legs can get incredible bursts of accel because you can lower your center of gravity, and get an enormous vertical push into the ground. You see athletes doing this in preparation for a strong movement of footwork. The resulting increase in friction from the increased pressure with the ground then lets you push laterally very very hard and very fast. But this raises your center of gravity after a few steps, and your ability to accelerate goes down.
Not unlike fighter aircraft, actually. There's a certain maximum sustainable turn rate of aircraft at their "cornering speeds". They can keep up that turn for a long time. But it's not their max. They can do a hard break turn, their maximum g-force turn, but they can't hold it for long, because it bleeds so much energy with the high angle-of-attack. With this loss of energy, they can replenish it by trading potential energy for kinetic energy.... losing altitude.
At least, that was the case for 4th generation planes. I think the latest 5th generation, with vectored thrust and greater than 1 thrust-to-weight ratio (allowing attitude control even with the wing stalled) can still keep going. "Supermaneuverability" and all that jazz.