Depends what the object is. If you'r testing it to see if it works properly, it can be a lot more convenient if it's tied down, so you can easily measure stuff, and you don't have to go and haul it out of the ocean afterwards.
"Christian McArdle" wrote | > I've got a New World Royale 600 gas cooker with a self-lighting | > oven - you turn the gas on and the sparker clicks away until | > the oven lights. | > First, how's it do that then? | Hardly rocket science.
Presumably there must be a similar mechanism on rockets to ignite them? I can't see NASA sending out for some two-furra-pound gas lighters every time they want to do a launch.
Actually, thinking about it, I think it might be rocket science. If the thing didn't light when you started spewing fuel out of the end, it wouldn't be good, would it?
Yes. Did you see that programme where they got some high up bods in the Soviet and US space programmes together? The American was boasting about how they'd spent millions getting an upside down anti-gravity pen working. When asking the Soviets how they solved that problem, they replied that they used pencils!
It varies. For example, the solid rockets on the shuttle are ignited by a small rocket motor mounted in the top. This is lit by a small pyrotechnic device. When it lights, it fills the chamber of the rocket with hot pressurised gas, and rapidly lights off the main engine.
The main engines do almost use gas-lighters. They are basically really big spark plugs, hooked up to a high power ignition system.
Ah, well that's half of it. That could explain why it works better when I've given it a good scrubbing.
It just doesn't spark at all and we have to push the ignition button. Not a problem, of course, but things that are supposed to work annoy me when they don't. Might there be a switch on the oven gas tap? I'll go and give it a prod (technical term)...
Aha! I've never played before...:) If I turn the knob just a few degrees, before the gas starts coming out even, it starts sparking. Switch?
OK. I'm not familiar with this model but other models which work like this do the following:
Attached to the spindle of the gas knob is a microswitch unit which powers the sparker. The electrodes of the sparker once the gas is lit are immersed in the flame this means the that although the sparker is running the mini bolt of lightning is shorted out by the flame and can't be heard. [2] All the rest of the operation (flame failure detection and regulo stuff) is the same as all other ovens.
[2] I beleive the Pott. Netaheat boilers work like this also.
Duff microswitch unit on the gas knob. Poor HT cabling, Poor/eroded electrodes...
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