[EMS Discuss] Sand flea robot

Tue Nov 19 17:42:33 PST 2013

Lb is a force, weight - slugs are the mass unit in imperial system.  Not that slugs are used since if you are going to deal with mass-weight differences (differences in gravitational fields).

Yeah, if you go with SI units - 1kg with g being 10 m/sec^2.  A 20 N force would give 10 m/s at take off which gives a 5 m height of jump. 

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On Nov 18, 2013, at 7:28 PM, Bob Miller <EMAIL HIDDEN> wrote:

> It depends on the size of the piston you pressurize.
> psi: pounds per square inch.  If you have 100 psi pressure acting
> through a 1 square inch piston, it will generate 100 lb. of force.
> 100 psi through a 2 square inch piston would create 200 lb. of force.
> And so on.
> To make an object jump, you need a force greater than the
> gravitational force on the object.  A 10 lb.(mass) object has a
> gravitational force of 10 lb.(force).  So you need more than 10
> lb(force) to make it jump.  If I remember correctly, double the force
> of gravity, 20 lb(force), would make it jump 16 feet high.
> This will all become a lot clearer in (college) freshman physics.
> (And note that the Imperial measurement system uses lb. as both a unit
> of mass and a unit of force.  It's confusing, so I disambiguated them
> above.  Metric system FTW.)
> On Mon, Nov 18, 2013 at 7:07 PM, mark Weller <EMAIL HIDDEN> wrote:
>> Me and a friend are working on building a robot like that boston dynamics "sand flea" does anybody know how we could make a good piston to power the launch?? We want to make it cheap so all DIY. Any body know if 100psi whould be enough to launch 10 pounds?
>> Thanks,
>> Connor Weller
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