Re: Infantry marching closer [TANKS]

[<funkyneroc-at-ntlworld.com>]

Phil, you clearly know your stuff.

you might not like this idea,(and I imagine you`ve thought
of this already) but.. Why dont you join 3 of the little follows together in a 
triangle ?,by means of a drive shaft maybe!
They could all step together (thats what I call discipline)
All stabillity probs solved.
easyer for my tank to find/hit/(run over).

a simple solution to a complex problem.
Although it might look a bit funny!

neroc

> 

> From: strangebut-at-aol.com
> Date: 2007/02/12 Mon PM 12:17:50 GMT
> To: tanks-at-rctankcombat.com
> Subject: Infantry marching closer [TANKS]
> 
> To reply to your points:
>  
> i) Yes.  
> ii) I have spent a lot of time on that one! I racked my brains on trigonometry 
>from school days and did some calculations. The best foot shape is a hollow square 
>or rectangle (because the worst obstacle is one which affects the middle of the 
>foot). Witha hollow foot, the worst hazard is something like a pencil which affects 
>both sides of the foot, and which the robot stands on with the middle of its foot. 
>In that case, my calculations show it should be able to cope with 6mm (a pencil). 
>Larger obstacles will be fine so long as they affect only one side (and because the 
>foot is hollow may miss it entirely). Long grass may be the major hazard, but a 
>hollow foot means that we may have enough weight to crush it. It is a fine balance 
>between leg length (which affects centre of gravity) foot size, weight,and weight 
>distribution. i have even considered attaching the batteries to the lower leg to 
>get the centre of gravity down. If I'm not going to be able to cope with heavy mud, 
>but !
> if I can cope with say a football pitchthen I'll be content.
>  
> iii) My intention is that he should have a spring-loaded right arm, so that he can 
>fire overarm like a cricketer. That means the recoil creates a rotational moment 
>(ie twisting force) rather than a straight backwards recoil which should be easier 
>to adsorb. At all events, the forces will not be as powerful as you get with a 
>paintball gun. i would expect to set it to a range of about 10m (60m to scale). I'm 
>not quite sure how much range you can get on a grenade, but the world record for 
>the javelin is around 100m, so 10m would seem manageable if we are trying to be 
>reasonably authentic.  I need to do some experiments with this- I need enough force 
>to burst the paintball, of course. If he falls over too often then I'll a) ditch 
>the rifle and substitute a moving left arm to balance the forces (this is what you 
>do when you throw something) b) use a "rifle grenade" fired from the waist- less 
>problem than from the shoulder or c) Think about some sort of recoilless system- 
>like a b!
> azooka. i had an idea of using water/air like one of those rockets you pump up 
>with your foot...
>  
> As you can see, there's a lot of experimenting to be done. I'm looking forward to 
>that!
>  
> Phil P
> 
> -----Original Message-----
> From: funkyneroc-at-ntlworld.com
> To: tanks-at-rctankcombat.com
> Sent: Mon, 12 Feb 2007 12.17AM
> Subject: Re: Infantry marching closer [TANKS]
> 
> 
> yer ,very clever, like that.but:-
> i,    will he fire paint?
> ii,   what happens if he walks on a stone?
> iii,  if an incoming paintball knocks him over, then (as you`ll know from what 
> Newton say`s about equal and opposite force`s)he will fall over when he fires 
> one.
> 
> If you can overcome these points then good on you.
> 
>  
> > From: strangebut-at-aol.com
> > Date: 2007/02/10 Sat PM 03:54:48 GMT
> > To: tanks-at-rctankcombat.com
> > Subject: Infantry marching closer [TANKS]
> > 
> >  
> > View full size Neroc wanted photos- this is my revised test rig for a walking 
> robot. Note the Knee Technology. This serves to keep the foot horizontal at all 
> times. Seems relatively stable- I've just ordered a motor and some bits to make 
> a full size (ie 1/6th) version. 
> >  
> >  
> > Watch this space...
> >  
> > Phil The Optimistic
> > 
> > 
> 
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