i need a quick reply about flameholders

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Zippiot
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i need a quick reply about flameholders

Post by Zippiot » Sun Jan 22, 2006 4:21 am

finger styled flameholder, in front of behind fuel injection? fuel is liquid gasoline diameter of ram is 2 inches
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re: i need a quick reply about flameholders

Post by Zippiot » Sun Jan 22, 2006 4:42 am

the entire ejt is about 8 inches long, i havent made the nozzle yet i plan on moulding it out of cement or clay
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Najm
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re: i need a quick reply about flameholders

Post by Najm » Sun Jan 22, 2006 6:43 am

can u tell the dimensions of the ramjet? like intake dia & length,exhaust dia and length.
i made a 2 inch dia ramjet and its less than 6 inches long

flameholder cross section should not be more than 30% of cc area

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re: i need a quick reply about flameholders

Post by Zippiot » Sun Jan 22, 2006 5:35 pm

its a finger styled flameholder, the intake is around 1 inch diameter and i havent made the exhaust yet, but i can form it to any shape and such once i get some cement
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!

Najm
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re: i need a quick reply about flameholders

Post by Najm » Mon Jan 23, 2006 2:54 pm

DONT make a ramjet's exhaust with ordinary cement ,it breaks under extreme heat conditions.

Zippiot
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re: i need a quick reply about flameholders

Post by Zippiot » Mon Jan 23, 2006 2:57 pm

wut do you recomend i use? i cant find anything that will take the heat except some clay but it shrinks considerably once dry. i gues si cud make it larger and shave it down after
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!

Najm
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re: i need a quick reply about flameholders

Post by Najm » Mon Jan 23, 2006 3:05 pm

sheet steel?
from those air freshener cans . they are easy to bend and as i dont have any welding equipement i fixed the sides together with staple pins, the cc was also made from that steel and it was all fixed by staple pins.
not for very small cones

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re: i need a quick reply about flameholders

Post by Zippiot » Mon Jan 23, 2006 3:09 pm

i can try it, anything that is free is worth a shot
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re: i need a quick reply about flameholders

Post by Zippiot » Tue Jan 24, 2006 5:59 am

ive been takin pic sof the project so far. i tried it without a nozzle and it worked great untiil the flameholder broke away. if i can secure it and get in a decent nozzle it looks like a success. btw i was out of gasoline and all other fuel, so it got it running off of paint thinner, its hard to light but it does burn (noxious fumes are a problem)
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larry cottrill
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re: i need a quick reply about flameholders

Post by larry cottrill » Tue Jan 24, 2006 1:32 pm

For a steel flameholder for such a small jet, you could cut one from the nose end of an empty 8 or 12 gram CO2 cylinder. They are hiogh strength steel, can be cut and filed easily (they are only about 1 mm thick) and will weld beautifully, though you need a light touch.

Here's a little guide for cylinder cutting and/or lathe turning you can print out and mark up as needed.

L Cottrill
Attachments
CO2 Cylinder.gif
CO2 cylinder planning guide for cutting or lathe turning. I think the diameters are the same for the smaller 8.5 gram cylinders. Drawing Copyright 2006 Larry Cottrill
CO2 Cylinder.gif (8.63 KiB) Viewed 7246 times

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re: i need a quick reply about flameholders

Post by Zippiot » Tue Jan 24, 2006 3:13 pm

thank you very much, i happen to have a few of those lying around.
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Sailing Student- Yes
Me- Then its too loose!

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re: i need a quick reply about flameholders

Post by Najm » Thu Jan 26, 2006 2:37 pm

any pics and dimensions of the ramjet u are making available?

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re: i need a quick reply about flameholders

Post by Zippiot » Thu Jan 26, 2006 3:33 pm

scroll up, but ill say them anyways.

8 inches long (have not made nozzle, can be either inside or outside depending...)
about 2 inches wide.

intake is formed but hole is only drilled to about 1/4 inch, can be made larger but best to leave it till after making nozle

it is an aerosol bottle, all steel. i have already heat tested it, it glows very nicely and i predict that it can take much more heat than gasoline and alcohol can make
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!

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