hmm thinking for your bike jousting you could just buy a chinese cag pocketbike for $100 off ebay (or well cheaper) and get at least a complete running bike with an auto clutch. just have to automate it.

and we could have RC bike races haha. that would be awesome havving an rc bike that you can sit on and have someone else control it. i may just do that for laughs anyway

http://www.youtube.com/watch?v=JlweKStu_Zc
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quote:

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Originally posted by Glen:

quote:

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Originally posted by DumHed:

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

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

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I'm thinking we should try and keep it to something fairly simple and against a clock or something like that.
jousting involves getting 2 non reliable contraptions moving and actually being able to hit each other, that sounds like a tough job even with all new parts.

Perhaps we should look at a "mini challenge" to warm up.
tabletop trebuche perhaps?
lob a cricket ball as far or as accurately as possible say?
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Mechanical engineers build weapons, civil engineers build targets

i sense too much overthinking going on

don't want to make things too complicated, it is meant to be a fun change from robots.. ie less stressful

simply a budget that need to stick to.. test everyones scrap salvaging and bargaining abilities..
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or on a slightly larger scale, a trebuche for a basketball and use it to play a game of ghost.
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They say that he crossed the fine line, from insanity to genius.

hmm RC basketball
only problem is its not Australian enough ;->
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Mechanical engineers build weapons, civil engineers build targets

A mini trebuchet would be excellent. Let's just keep the rules to this:

Standard ammo is a cricket ball (easy to get, not too heavy)

Maximum arm length of 1.5m (up for final decision)

Maximum budget $100 AND each team has to document their materials & costs.

That should be easy to stick to and is enough to make the competition fair; the winnesr will need to have good design and building skill to win. Let's leave the materials, weight, etc completely open to encourage innovation.

For safety. I propose we find somewhere with a very long open space and we do a safety test fire with a much lighter counterweight. Devices must be operated from at least 4 metres distance and out of the line of fire.

quote:

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Originally posted by Valen:
hmm RC basketball
only problem is its not Australian enough ;->

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quote:

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Originally posted by Nick:

Standard ammo is a cricket ball (easy to get, not too heavy)

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quote:

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Originally posted by Nick:
A mini trebuchet would be excellent. Let's just keep the rules to this:

Standard ammo is a cricket ball (easy to get, not too heavy)

Maximum arm length of 1.5m (up for final decision)

Maximum budget $100 AND each team has to document their materials & costs.

That should be easy to stick to and is enough to make the competition fair; the winnesr will need to have good design and building skill to win. Let's leave the materials, weight, etc completely open to encourage innovation.

For safety. I propose we find somewhere with a very long open space and we do a safety test fire with a much lighter counterweight. Devices must be operated from at least 4 metres distance and out of the line of fire.

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To clarify,
Trebuchet as in gravity powered?

Jason has a huge torsion catapault...
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( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Yep, good old dependable gravity - what could possibly go wrong?

RC Cricket ?

Ok, who's going to be first to build a scaled-down "Pitching Machine" ?
http://www.srl.org/machines/pitching/

Beat *that* fast-bowlers !
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god that's horrifyingly scary

Um, I have some design sketches for a small pitching machine. Its more of an electric ballista, launches 25mm arrows. With two Mag C40 motors @ 36V and 10" wheels, it has a theoretical launch speed of 180 mph.

So that looks like the mini challenge is on - I don't see any dissentions

Next thing to decide is when to hold it; I suggest we officially start right after the June 26th event and finish July 24th with the competition day. That fits between events and gives 4 weeks for building.

Before we pick teams, How many people are going to get involved - it would be nice to have 4 builders per team, but for a mini challenge, we can go with 2 or 3.

When you register for the mini challenge, please list the top 2 or 3 skills you can apply to making a trebuchet - something like "Nick - Machining, Carpentry"