Subject:
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Re: rocket powered LEGO vehicle
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Newsgroups:
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lugnet.loc.ca.bc.vic
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Date:
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Wed, 24 Nov 1999 20:40:44 GMT
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Viewed:
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2356 times
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James... try
http://www.webcom.com/legacysy/convert2/convert_old.html
James Powell wrote in message ...
>
> > As James said, a longer burn might best. The majority of the energy might
> > be spent breaking the momentum of rest. In a several gram cardboard tube
> > not as big problem, lego vehicle (LV)... substancial problem. One
> > suggestion might be engaging the engine after the LV has started moving. • I
> > am thinking of some sort of incline that the LV would roll down (two of
> > those Hot Wheel tracks maybe?) and the engine would be engaged once the LV
> > hit the flat (moving). This could incorporate the MS in a neat way; • sensing
> > when the engine should be engaged rather than just engaing it... touch
> > sensor tripped, light beam broken, excetera.
> >
> > The engery equivilant of, Randy lifting the LV to the top of an incline,
> > might be _several_ engines, depending on the mass of the LV.
>
> No, the engines have a fair amount of energy. I will have to go and dig up • my
> sheets on the engines...(goes away, comes back soon)
>
> First off, some physics.
>
> Ep=MGH
>
> Ek=1/2 mv^2 (thats V squared)
>
> Where,
>
> Ep= Potential Energy (gravity)
> Ek= Energy to get something to a speed (Energy Kinetic) Both in J
> M=Mass (in kg)
> G=9.8 (gravity)
> H=Hight
> V=Velocity
>
> Now, taking a look at my handy ESTES catalog, the motor I am suggesting has • a
> rating of
> C-5-3 Total Impulse=10 N/S
> Delay 3 sec
> Max Thrust 5 Lb
> Thrust Duration 2.1 Sec
> (average thrust is 4.76 N, appiled for 2.1 sec)
> (this is a very peaked graph, if you look at it it is like v- upside down)
>
> Now, if only I could find the conversion from N/S to J, then I could go and • do
> some calculations.
>
>
>
>
>
> >
> > As to the LV itself; four or three wheels might produce better initial
> > reuslts.
>
> Three, because then your friction is reduced.
>
>
> > Doesn't the Extream Team have a rocket car? That might be a cool
> > conversion. Other things I was thinking about... rear wheels behind • thrust
> > point; slight downward thrust rather that upward; I think that engines • have
> > a thrust value that could be used to calculate approximently, if you were
> > looking at launching a ABS projectile capable of penatrateing steel, or • just
> > zipping across a parking lot :).
>
> Yep. I don't think that we are in danger of breaking the speed of sound • with
> this one though...
>
> James
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Message is in Reply To:
 | | Re: rocket powered LEGO vehicle
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| (...) No, the engines have a fair amount of energy. I will have to go and dig up my sheets on the engines...(goes away, comes back soon) First off, some physics. Ep=MGH Ek=1/2 mv^2 (thats V squared) Where, Ep= Potential Energy (gravity) Ek= Energy (...) (25 years ago, 24-Nov-99, to lugnet.loc.ca.bc.vic)
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