www.robowars.org

RoboWars Australia Forum Index -> Technical Chat

Best weight to defence armour
Goto page Previous  1, 2, 3, 4, 5, 6  Next

Post new topic   Reply to topic
  Author    Thread
Spockie-Tech
Site Admin


Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia


 Reply with quote  

I hope thats an example of Philip humour. Shocked

You do realise he's talking about an LPGas bottle I believe ?

Flush it with water. I dont know from personal experience, but I would imagine the ones who *have* found out that you should have from personal experience probably arent around anymore to say you should flush.
_________________
Great minds discuss ideas. Average minds discuss events. Small minds discuss people

Post Fri Aug 11, 2006 4:06 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
Rotwang
Experienced Roboteer


Joined: 15 Jun 2004
Posts: 1589
Location: Vic


 Reply with quote  

Don’t think giving this sort of advice on public forum is a good idea but I have heard that after venting for a few days [remember propane is heavier than air]. Wave a long lighter near hole where you have removed valve. Best to wear gloves, earmuffs and safety goggles. You will either get nothing, a gentle woofey flame or a bang so point the opening away from you. Once it goes out it is safe to cut. Now remember this is not my advice I am only repeating something I heard.
Personally I would prefer not to mess around with water, that’s more for petrol tanks. And then it is best to use an air powered angle grinder and wait for a warm sunny day. Petrol seems to really work its way into the metal.

Post Fri Aug 11, 2006 5:15 pm 
 View user's profile Send private message
wilko



Joined: 25 Sep 2005
Posts: 133
Location: Ballina N.S.W


 Reply with quote  

but if u filled it with water all the gas would float to the top?
_________________
WHEN YOU GO TO COURT YOU'RE TRUSTING YOUR FATE TO TWELVE PEOPLE
WHO AREN'T SMART ENOUGH TO GET OUT OF JURY DUTY

Post Fri Aug 11, 2006 8:48 pm 
 View user's profile Send private message Send e-mail Visit poster's website
Glen
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect


 Reply with quote  

maybe he means if you just keep on filling it with water eventually all the gas will be displaced out of the tank..
_________________
www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Post Fri Aug 11, 2006 8:51 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
dyrodium
Experienced Roboteer


Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


 Reply with quote  

That would be the idea.
_________________
( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Post Fri Aug 11, 2006 8:57 pm 
 View user's profile Send private message Visit poster's website MSN Messenger
Totaly_Recycled
Experienced Roboteer


Joined: 15 Jun 2004
Posts: 1346


 Reply with quote  

Petrol tanks normaly have folded seams thats where the fuel gets traped ive welded and soldered on petrol tankls after takeing out all the bungs -tubes and any other places i can open to allow air in and fumes out then put them out in the hot sun for at least 3 days in a row and then either run warm air from a beaver spray paint blower or a reverse vacume cleaner into to it for another 10 minutes or so to make sure there's no fumes ..water makes petrol condense so any traped in the seams will usualy stay there if you flush it with cold water. Gas should be similar to petrol to difuse but with only one opening i would sugest leavinig it open upside downfor a couple of days to let the gas fall out and also subject it to a good flush of warm air before cutting .

Be carefull if it is an old gas bottle as they can get a build up of an oily scum inside them from the adidtive that is put into make the gas smell.

LPG naturely doesnt have an odour so the gas compaines add an oily substance to make it smell which can absorb some gas and then release it when heated with a grinder or oxy etc .

I have drilled and welded on gas botles before but what i did was let them air up side down for at least a week with out the valve then added a water based degreaser (koala brand or similar) (not fuel based )and flushed them out with water afterwards to get rid of the oils .Aother way which is hard to do but which some old timers did on fuel and gas tanks was to let them dry out then put the exaust from a diesle engine into them while welding so as to keep them flushing with a suply of basicly inert gas .

What ever way you try just be carefull and if you think there is any gas left dont cut it until you are sure there isnt .

Post Fri Aug 11, 2006 9:14 pm 
 View user's profile Send private message
Damien (not Damian)



Joined: 15 Sep 2005
Posts: 327
Location: The other side of The Wall...Melbourne


 Reply with quote  

This might be a bit late but...

What IS air armour? I've never heard of it.
_________________
It seemed like a good idea on paper...

Post Wed Aug 23, 2006 5:48 pm 
 View user's profile Send private message
Rotwang
Experienced Roboteer


Joined: 15 Jun 2004
Posts: 1589
Location: Vic


 Reply with quote  

It’s when you deliberately leave a space between the outer shell and the inner works so an enemy weapon can dent or penetrate your bot without hitting any thing vital. EG Jolt tore a hole in Bane adjacent the batteries but needed to penetrate another 50 mm of air Armour to hit the batteries. Smile

Post Wed Aug 23, 2006 6:52 pm 
 View user's profile Send private message
dyrodium
Experienced Roboteer


Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


 Reply with quote  

Basicaly if a spinner can't hit you, it can't do any damage, regardless of it's destructiveness... Razz
_________________
( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Post Wed Aug 23, 2006 9:11 pm 
 View user's profile Send private message Visit poster's website MSN Messenger
prong
Experienced Roboteer


Joined: 19 Jun 2004
Posts: 839


 Reply with quote  

It is slightly more complex than that Angus Razz

Its the idea of having an air gap inside your robot between an outer shell and your inner breakable bits.

So say if a robot with a saw has 5cm of reach with the blade, if you have 10cm of air armour the saw slices through the outer armour but the rest of the intact armour stops the robot from getting closer than the outer shell, so the blade only reaches halfway to your vitals.

Same thing against a spinner, the spinner rips chunks from yoru outer shell, but even with bits missing it stops the spinner getting close enough to damage your vitals.

It also applies to axes, spikes etc, they can penetrate your outer armour but not reach the vitals.


Usually using air armour you end up with a big bot and thin armour, but lots of it can get dented, torn off or filled with holes without damaging the internals.

My first robot, Robort, was like this, it has all sorts of lightweight armour, chicken wire, plastic, stell tube etc wired onto the outside and fighting Jolt it got most of it torn off, but Jolt could never reach anything critcal to kill me outright.

Air armour is great Smile, cheap too!


Last edited by prong on Wed Aug 23, 2006 10:12 pm; edited 1 time in total

Post Wed Aug 23, 2006 9:41 pm 
 View user's profile Send private message Send e-mail
Totaly_Recycled
Experienced Roboteer


Joined: 15 Jun 2004
Posts: 1346


 Reply with quote  

Sproing has its own type of air armour as well

Post Wed Aug 23, 2006 9:56 pm 
 View user's profile Send private message
NMO
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 486
Location: Melbourne


 Reply with quote  

For my new bot 6x7 I didn't have much weight left for some top armour, with robots around like scoopy doo and sceletor it was important to stop things comming throught the top into the vitals. I have there for setup a peice of air armour that will stop me being invertable but will stop the saw's from reaching anything vital. the armour is made from polystirene with a thin layer of plastic over the top. It would be usless against spinners, but it will stop any saw blades from getting at the internals, and we have yet to have a spinner with an overhead saw as well.

Post Thu Aug 24, 2006 9:13 am 
 View user's profile Send private message
maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


 Reply with quote  

Hannibalito uses a belt of 10mm UHMW PE, and that is scratched at best after a year of use. The bottom and bottom partially armored with 5mm UHMW PE

It's not expensive, easy to work with, and it floats in water.

Post Sun Dec 24, 2006 8:19 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
dyrodium
Experienced Roboteer


Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


 Reply with quote  

Very Happy I use UHMW.
Did you know it CAN crack? Jolt showed roadkill that on a couple of ocassions. Apart from that it's a very nice material, easy to work with. Smile

EDIT: well crack isn't the right word, it sort of tears like cardboard would I guess is the most similar thing to it.
_________________
( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Post Sun Dec 24, 2006 8:51 pm 
 View user's profile Send private message Visit poster's website MSN Messenger
maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


 Reply with quote  

Never seen UHMW PE crack or tear in any other way than like a chewing gum drawn out.

Maybe if it was in the sun for too long, all plastics degrade in sunlight.
Another way to do it, is to freeze it with liquid nitrogen, and even then it stays rather resilient.

But it is soft.

Post Sun Dec 24, 2006 9:00 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
  Display posts from previous:      

Forum Jump:
Jump to:  

Post new topic   Reply to topic
Page 5 of 6

Goto page Previous  1, 2, 3, 4, 5, 6  Next

Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

 

Last Thread | Next Thread  >
Powered by phpBB: © 2001 phpBB Group
millenniumFalcon Template By Vereor.