Titus Theseira, via Facebook asked:
How does a jet engine get started?
Dave - A gas turbine jet engine is quite interesting in that it just doesnít work unless itís spinning - like a normal car engine. So basically, you've got to spin it up fairly fast, so you attach an electric motor into it - either itís integrated in there or you stick on the outside and spin it up. Then it gets going pretty fast, you inject some fuel, then you essentially have something like a spark plug inside it which ignites the fuel, then it starts it going and it basically then starts running, spins up to full speed, and you have a jet engine.
Chris - So itís not dissimilar to a diesel engine in a sense that you've got to get the engine spun up to start compressing air to get it hot so you can inject fuel to start it burning, and then once itís going, itís got its own ability to carry itself.
Dave - Yeah, pretty much! Also, there's nothing really to make the air explosion coming out of the back if the air is not coming in the front so you've got to have everything spinning for it to work at all.
or, you can simply plug it into a convenient leaf blower
I watched that video but you can't actually see anything! chris, Thu, 25th Aug 2011
That's not a hair drier, it's a hot air gun. There's a difference. Bored chemist, Fri, 26th Aug 2011
And you can jump start them.......... Not recommended though, as you just point the exhaust of another running one into the inlet of the non runner to spin it up enough to start. SeanB, Fri, 26th Aug 2011