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NSW Scrapheap Challenge 2010
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Nick
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Sounds OK, if we can get a short-list of the 5 most popular, then we draw one at random to decide the final challenge.

Post Thu May 13, 2010 11:52 pm 
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Glen
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1) petrol karts
2) power tool drags
345678910) couldnt care less Razz
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Post Fri May 14, 2010 12:16 am 
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DumHed
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Elly had a good idea, what about R/C jousting?

It can go on the normal jousting rules, where different hits and / or broken sticks score differently.
We could have a kill switch that gives an instant win if it's hit (same location on each bot)

I'm not sure if these should be normal wheeled robot type things, or something extra difficult like R/C converted motorbike frames Razz
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Post Sun May 16, 2010 8:25 pm 
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dyrodium
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Haha, i had that same idea but was tentative to suggest it. Big workshop kill switch mounted somewhere. How about we make them walkers Laughing
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Post Sun May 16, 2010 8:53 pm 
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Nick
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quote:
If we did develop a good and reusable car RC control, that opens up things like car jousting


Looks like our attention span is less than one page! Razz

That's 3 votes for RC jousting then.

Post Sun May 16, 2010 10:06 pm 
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DumHed
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heh true.

I'm thinking something more ridiculous, like motorised pushbike frames, or old motorbikes.

They'd be easy enough to transport and find a place to run them too vs cars.
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Post Sun May 16, 2010 10:49 pm 
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Nick
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True, the easier to transport them, the better! Wouldn't bikes be rather hard to keep upright? Or were you already thinking of having an outrigger/ side car? The other problem I can see with bikes is that it will need a tougher steering set up - no power assist on a bike! No auto gearbox for that matter.

I just salvaged a heap on good steel tubing from a bunk bed that was being thrown out - there is some nice rectangular tubing just waiting to be cut & welded into a junkyard knight

Post Sun May 16, 2010 11:00 pm 
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DumHed
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Bikes don't need that much control effort.

I'd use a stabiliser for takeoff, then they'll balance ok.
Steering can be weight shift (actuator, or pendulum on a gearbox) or you can control the steering directly.

It'll be a bit harder to do than car steering, but it needs to be a challenge right? Also it might be pretty amusing Razz

For power I think electric would be easiest, but centrifugal clutched whipper snipper / chainsaw engines would also be good.
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Post Sun May 16, 2010 11:25 pm 
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Nick
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OK, I was seeing some 600cc bikes chucking wheelies as they charged each other. EV would certainly be easiest and would not need constant restarts aftr stalling.

About a page ago, I was imagining that we just got a pair of compact cars like Barinas and fitted them with an RC kit.

Also remember that I have a van with a perfectly good motor and transmission, just needs a starter solenoid to get it going. Chop off the upper body and you have a lovely platform for many different tasks. Its definitely junk and completely free!

Post Sun May 16, 2010 11:40 pm 
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DumHed
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that's true!

full sized cars add a lot of difficulty and danger though (and it's harder to find somewhere to run them!)
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Post Sun May 16, 2010 11:48 pm 
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Nick
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I am not so sure. Its true that cars have more mass and could be more dangerous if they 'ran away', but on the other hand they are more stable and probably easier to fit controls to (think 'power steering, brakes and automatic gears'). Running them could take more space depending on their stopping distance and turning circle, but I think all we need is an embankment that they cannot drive up to keep us safe. It would definitely be a good safety idea to limit speeds to something sane.

Its becoming clear that several of our more interesting ideas need special venues - jousting, submarines and climbing, just to name a few. perhaps we should think of some venues before we get too excited about them?

One really 'out there' possibility for jousting is to have a test run, film it, then see if we can run it as a demo at a car racing event - possibly too ambitious, but it would definitely be exciting if we pulled it off. I will ask an amateur racing friend about venues next week.

Post Mon May 17, 2010 12:13 am 
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Glen
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quote:
Originally posted by DumHed:

Steering can be weight shift (actuator, or pendulum on a gearbox) .


ahhh not so! http://www.youtube.com/watch?v=3nRUeEkS644

if the bike has a steering damper just make a linear actuator to replace it Smile

sounds like the comp is getting pretty serious Shocked
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Post Mon May 17, 2010 12:24 am 
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Nick
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serious but scrappy Smile

Post Mon May 17, 2010 12:28 am 
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dyrodium
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quote:
Originally posted by Glen:

sounds like the comp is getting pretty serious Shocked

Don't push it out of the reach of some of us... Laughing
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Post Mon May 17, 2010 12:28 am 
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Nick
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Definitely not, we want this to be relatively cheap and spread across a team of at least 4 builders. I was thinking about a generic rule that imposed a penalty related to the quantity of new parts VS scrap. IE If a device was 50% new parts, it would be penalised 50% of the criteria for that event. That could apply to time, weight, outright score, speed or whatever and would make an expensive new build quite unattractive.

The message I want to convey is that big things don't really have to cost more than smaller, lighter scrapheap machines. For every free van I have, I am sure there are several $100 cars available. If we can't afford to do something with cars or bikes, then EVs are still interesting and stationary devices like siege engines are even cheaper - I just salvaged about 50% of the frame for either option for the cost of a walk down the street Smile

Post Mon May 17, 2010 12:47 am 
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