Classic cars forum & vehicle restoration.
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Rick
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Joined: 27 Apr 2005
Posts: 22449
Location: UK
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buzzy bee
Joined: 23 Nov 2007
Posts: 3382
Location: South Cheshire
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 Posted: Sat Feb 02, 2008 10:42 pm Post subject: |
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Hi
You would need a fir truck after playing with one of those in the garden!
Seriously why do jet cars make smoke and flames like that, never saw a plane at the airport doing that?
Cheers
Dave |
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Rick
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Location: UK
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Scotty
Joined: 23 Nov 2007
Posts: 883
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| Posted: Sat Feb 02, 2008 11:03 pm Post subject: |
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| buzzy bee wrote: | | Seriously why do jet cars make smoke and flames like that, never saw a plane at the airport doing that? |
Hi Dave,
What you're seeing is a system usually fitted to military aircraft only called "Afterburners", although the Concord fleet had them as well, but I believe no other civil aircraft have been fitted with them - no need.
An afterburner is a way of dumping raw fuel into the exhaust of a jet engine which immediately ignites producing a huge amount of extra thrust - and a spectacular flame cone that shoots many metres out of the rear of the engine. Military fighter aircraft use it to give then very rapid acceleration when they need to get out or into a situation rapidly. The down-side is the large quantities of extra fuel an afterburner uses, hence they are limited as to their use. The other down-side is the resulting noise when an afterburner is in use, one of the factors that held back the development of the Concord routes into the American market - they are very, very, very loud!
Jet cars and trucks use it for the same reason to gain rapid acceleration, although many of them its limited to all show, not much go. I've seen "real" jet cars on the drag strip at Gainsville in Florida and they are the fastest accelerating and loudest things I've ever seen on 4 wheels! 
Some Hot Rodders use something that could almost be likened to an afterburner, where once again fuel is pumped in the exhaust system near its tail-pipe end, but instead of the super heated exhaust igniting the fuel like a jet engine does it needs a specially fitted "spark plug" that's screwed into the exhaust pipe to ignite it - result - a spectacular cone of flame shooting out of the exhaust tail-pipe(s), but that's all it is, just for show, no go.
Scotty.
Edit: I was still writing this when Rick added his reply, but since mine is a "War & Peace" length reply I'm going to leave it in as I sweated blood over it!  |
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Scotty
Joined: 23 Nov 2007
Posts: 883
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| Posted: Sat Feb 02, 2008 11:10 pm Post subject: |
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| Rick - I wouldn't have minded sitting in one of these coming out of the appliance room in the old Central Fire Station in Glasgow city centre at rush hour, boy that would have cleared the streets! |
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buzzy bee
Joined: 23 Nov 2007
Posts: 3382
Location: South Cheshire
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| Posted: Sun Feb 03, 2008 12:55 am Post subject: |
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Hi
Thanks both for the replies! he he
I supose you don't notice them on figthers, visually as a by stander, as they are moving along a bit!
Cheers
Dave |
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Rick
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pigtin
Joined: 23 Nov 2007
Posts: 1879
Location: Herne Bay
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| Posted: Sun Feb 03, 2008 4:50 pm Post subject: |
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Anyone old enough to have used one of the old paraffin blowlamps? it (sort of) reminds me of one of those... They used to have a thin bit of wire on the of a tin strip for 'pricking' the jet. Wonder what they use on the fire truck? 
Don. |
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