Rules on use of Axe

[cidade]

Rules on use of Axe

Ok, destructing the other bot doesnt seem like a problem to me anymore, as long as I stop when the other bot doesnt move anymore.

Second, will the weight cause any trouble? Say the total engine will take 40 kg, there is still 60 left for armour, the weapon (axe, hammer, etc) and other stuff.

Does anyone know something about the limitations of an IC engine? Think of what happens when the bot and therefore its engine is turned upside down - not uncommon with all those flipping bots. What is a reasonable thickness of what kind of steel for the armour, protecting the IC engine? Further I am concerned about the volume the engine with all its side parts will demand.

[leorcc]

Rules on use of Axe

I agree on the IC engine advice, it is not worth the bother and goes against the KISS principle. Plus there will be a lot of events where you couldnt compete since they are indoors and most venues dont allow IC engines there.

[typhoon_driver]

Rules on use of Axe

Paul you are going to struggle to fit in any single component weighing 40kg into a 100kg machine. Believe me when I say that 60kg will not be enough for the rest of the machine.

I struggle to fit single motors into my machines that weigh 15% of the total weight whilst giving enough weight to other components.

For 10kg you could look at using an etek motor (http://www.robotmarketplace.com/products/ETK-ETEKRT.htmlhttp://www.robotmarketplace.com/prod...TK-ETEKRT.html) or something on a similar scale. Huge amounts of torque, all you would need is a gearing and locking mechanism.

I am not saying that this is the route to take but if you look above there is no one saying the IC engine is a good route to take and there is a reason that there are no active robots that I know of that use them.

[cidade]

Rules on use of Axe

Following your advice would probably be the best, but maybe I have to experience it myself. Does anyone has some building plan about a robot with a IC engine and its limitations (e.g. weight, torque etc)?

How much does a ETEK motor produce compared to a typical IC engine? For example how much HP does a 250 cc produce compared to the ETEK motor from the site.

[maddox]

Rules on use of Axe

Comparing an Etec to a smallish IC motor

A good tuned 2stroke 250CC does easely 25Hp. But will run up to 20Krpm to get it. Weight, after adaption, 10-12 kg, and thats with a nice enginering feat.

A tuned to the max 50 cc moped engine-inside a reasonable limit and not using unobtanium piston and such can deliver 12-14 hp, but runs even over 25Krpm. Weight 7 kg, and no useable torque.

An engine specificly build for RW, a 140cc aircoled boxer with starter motor, was 7 kg, and ment to drive an hydraulic pump. but that one was never finished, because the crankshaft did prove a problem to make. (comparable engines can be found at the model shop, the largest engines used in model planes, and if you dont want chinese slave labor el cheapo stuff, youre looking at ‚+/-1500)

The larger, more powerfull model engines. forst of all ‚‚‚‚‚‚, and fragile for the application youre looking, but weight for power, you cant do better.

The old data I have from an Etec is that it does 11 Hp at max.But that means, on 36V you need batteries that can supply 305 amp for more than a flash. Meaning, youre looking at or very heavy SLAs of a good brand (Hawker Genesis pure lead technology or simular, like the Odyssee, Datasafe or SBS, all Hawker brand.) Or a serious amount of batteries like 3000mAh high grade NiMH or NiCD batteries. Another, equaly expensive solution is to have at least 8 10 cell A123 packs parallel.

Leo has a very valid point in the venue- comustion engine rules. Most venues are things like leasure centers, and those are not lenient towards fuel driven appliances indoors.