### Subject: How to get a 1000lb robot 10 feet into the air

Date: Thu Jan 5 08:25:47 2006
Posted by No name entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Biophysics
ID: 1136474747.Bp
Message:
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If I were designing a robot that had a 400lb torso (waist and up) and 300lb
(each) legs( because of the hydraulic system in the foreleg of each) and I
wanted it to jump 10 feet into the air (of course not land, there is no
suspension!!!) :) how much force (in psi I guess) should the plantar flexor
(artificial gastrocnemius) produce. And how much force (in psi I guess) should
the knee extendor (Artificial Quadriceps) produce. The said robot's legs are
based on our own anatomically. I think I remember reading a fact sheet about
olympic athletes that said a good 2 legged jump was made up of 40% Quadriceps,
20% Gastrocnemius, X% Hamstrings, etc. This may seem like a vague question
that does not address the complexity of the problem so I will clarify. I want
to know what amount of force would be needed from the Gastrocnemius and
Quadricep to lift a person that weighed 1000 lbs. 400 lb torso, no arms, 600
lb (300 each) legs.  About "How Many psi should be produced by hydraulic pumps
in each leg (regardless of orientation as the psi force will be translated
into pulling artificial tendons) for a two legged jump that takes the 1000lbs
frame 10 feet into the air?" The only other question would be what equations
would be most useful for answering this question.

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Re: How to get a 1000lb robot 10 feet into the air

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