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Low-Speed Ram Jet

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Low-Speed Ram Jet

Unread postAuthor: brplatz » Thu Aug 07, 2008 9:29 am

This is my low speed ram jet. Or thats its name but im not sure it if works exactly like a real one.

http://www.cottrillcyclodyne.com/Maggie ... aggie.html

That is where i got the idea from and I will test it later after i get off work.
If you look on the 3rd page it shows it when its running.

Here it is (its kinda dark)
Image
the copper pipe is the fuel injection
Image
this one you can see the diffuser/flame holder
Image

not quite done with it yet but i will be done today!
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Unread postAuthor: Sticky_Tape » Thu Aug 07, 2008 9:38 am

doesn't it have to be moving for it to work?
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Re: Low-Speed Ram Jet

Unread postAuthor: jackssmirkingrevenge » Thu Aug 07, 2008 9:39 am

brplatz wrote:This is my low speed ram jet. Or thats its name but im not sure it if works exactly like a real one.


From wikipedia:

Ramjets require considerable forward speed to operate well, and as a class work most efficiently at speeds around Mach 3, and this type of jet can operate up to speeds of at least Mach 5.


What's the practical application of this though? Jet booster for your BMX :D

doesn't it have to be moving for it to work?


...or you could blow air through it ;)
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Unread postAuthor: Sticky_Tape » Thu Aug 07, 2008 9:42 am

mach 3 windspeed yeah
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You can tell how awesome a cannon is by the pressure used.
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xnt rnm ne z ahtbg
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Unread postAuthor: brplatz » Thu Aug 07, 2008 9:43 am

yes it requires air to be blown from the front kinda fast. My big leaf blower will work. No real practical application, just looks.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 07, 2008 9:49 am

brplatz wrote:No real practical application, just looks.


Shame, an engine that doesn't go anywhere is just a fancy propane burner. Surely there's something moving you can mount it on, scooter, skateboard, family dog, younger sibling, the possibilities are endless :D
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Unread postAuthor: Sticky_Tape » Thu Aug 07, 2008 10:06 am

I say mount it to a scateboard push it a bit ignite and see if it reaches mach 5 before it blows up. I am pretty sure that is what happened to those nasa planes that used ram jets.
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Re: Low-Speed Ram Jet

Unread postAuthor: Ragnarok » Thu Aug 07, 2008 10:39 am

jackssmirkingrevenge wrote:From wikipedia:

Ramjets require considerable forward speed to operate well, and as a class work most efficiently at speeds around Mach 3, and this type of jet can operate up to speeds of at least Mach 5.

Normally a ram jet can work slower than that, Mach 3 is just the most efficent range, but they all need the advantage of supersonic air flow.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: brplatz » Thu Aug 07, 2008 10:43 am

i might attach it to my RC car and see if i can get it to run.
it should put out a little bit of thrust if im correct.
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Re: Low-Speed Ram Jet

Unread postAuthor: Sticky_Tape » Thu Aug 07, 2008 10:58 am

Ragnarok wrote:
jackssmirkingrevenge wrote:From wikipedia:

Ramjets require considerable forward speed to operate well, and as a class work most efficiently at speeds around Mach 3, and this type of jet can operate up to speeds of at least Mach 5.

Normally a ram jet can work slower than that, Mach 3 is just the most efficent range, but they all need the advantage of supersonic air flow.

Don't you mean subsonic?
Why not make a hover craft like base and power the jet with the leafblower and inflater the skirt with the leaf blower then it would be off of the ground and it would be jet powered
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You can tell how awesome a cannon is by the pressure used.
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Unread postAuthor: brplatz » Thu Aug 07, 2008 11:08 am

that actually sounds like a good idea!

possible use hair dryers though because of the weight issue
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Unread postAuthor: brogdenlaxmiddie » Thu Aug 07, 2008 11:30 am

Sticky_Tape wrote:I say mount it to a scateboard push it a bit ignite and see if it reaches mach 5 before it blows up. I am pretty sure that is what happened to those nasa planes that used ram jets.


I'm not sure about the ram jet planes, but I am certain that none of the SCRAM jets blew up. I thought that they all worked w/o explosion.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 07, 2008 11:31 am

...and you'll need a flame-proof skirt ;)
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Unread postAuthor: Sticky_Tape » Thu Aug 07, 2008 11:35 am

The engine would be mounted on back so why would the skirt be effected?
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: Ragnarok » Thu Aug 07, 2008 11:50 am

Sticky_Tape wrote:Don't you mean subsonic?

Sorry, afraid not..

A true ram jets can't work at all when the air flow is under Mach 1 - below that speed, it's just a glorified blowtorch, which won't provide any trust.
"Low speed ram jet" is a total misnomer. Unless that RC car is impossibly fast, this won't be able to provide thrust.

If you really want a subsonic jet engine with a minimum of moving parts, a valveless pulse jet is the best bet.
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