Low-Speed Ram Jet

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brplatz
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Ragnarok wrote:
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.
i agree completely. this is just a fun project to screw around with till i get materials for my valveless pulsejet working.
"Any problem on Earth can be solved with the careful application of high explosives...the trick is, not to be around when they go off" Col. Mertz Von Quiriheim
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Pilgor
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jam jar pulse jet....... easy to make
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brplatz
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already made one but it didn't work as well as his. but all i had was gasoline and lighter fluid
"Any problem on Earth can be solved with the careful application of high explosives...the trick is, not to be around when they go off" Col. Mertz Von Quiriheim
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TurboSuper
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Well, it sure looks cool. If I were you I'd start the worlds first ramjet grill.
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brplatz
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look at gippetos siphon burner! that could heat a million grills! :D
"Any problem on Earth can be solved with the careful application of high explosives...the trick is, not to be around when they go off" Col. Mertz Von Quiriheim
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Gippeto
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That might be stretching it some. :)

I couldn't PM these so I guess I'll just put them here? Any problems, just let me know, and they're gone.
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The start. Version 1. Running on 50/50 used car oil and diesel. Had to use a fan to start it. Deafening is the best description.
The start. Version 1. Running on 50/50 used car oil and diesel. Had to use a fan to start it. Deafening is the best description.
Version 2 cranked up. No fan needed for start. Quieter due to smoother airflow. Burns further down the tube where it's supposed to. Big improvement!
Version 2 cranked up. No fan needed for start. Quieter due to smoother airflow. Burns further down the tube where it's supposed to. Big improvement!
My favorite shot of version 2.
My favorite shot of version 2.
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Ragnarok
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TurboSuper wrote:Well, it sure looks cool. If I were you I'd start the worlds first ramjet grill.
Ah, well, the Top Gear boys did once build a grill that used a pulse jet engine from a V1 doodlebug. :D
So the idea of a jet based grill couldn't be entirely original. (And no doubt it's been done for years already)

However, I doubt that that particular Top Gear offering been seen much outside the UK, because it was done for a charity show, so unlike the regular series, I don't think it'll have been sold out.
Does that thing kinda look like a big cat to you?
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trollhameran
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The top gear boys are awesome, love the way they turned up to the challenge against that German show in Spitfires :D
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brplatz
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@gippeto

what is your V2 made out of?
also what kind of nozzle are you using to spray or atomize fuel?

i have plenty of old SS coffee mugs from this last project just waiting to be used :D
"Any problem on Earth can be solved with the careful application of high explosives...the trick is, not to be around when they go off" Col. Mertz Von Quiriheim
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Gippeto
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I thought I mentioned that?

The burn tube is made from 2 1/2" exhaust pipe. The nozzle is a modified 175000btu unit from a Mr. Heater kerosene heater. (I think it's made by Delavan) The nozzle holder is stock.

The shape and length of the burn tube, especially the taper section, will determine how well the burner works.

Go ahead and try your coffee mugs, they might work fine. :)
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
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