how do you flare a pipe?

Esser · Post by **Esser** » Mon Nov 05, 2007 5:31 pm

Just a simple question... How do you flare the end of a pipe? Like on the intake pipe... So the jet can suck in the air more easily. I just made a quick 3D model of what i mean

You can press the image so it will be bigger.

metiz · Post by **metiz** » Mon Nov 05, 2007 6:31 pm

Get a piece of pipe that has a similair diameter of the pipe you want to flair. put your pipe in a vice with the end that needs to be flared sticking out of the side of the vice about 3 cm. get your similar tube and hold it against the pipe in your vice at an angle - and then start hitting the living shit out of it, slowly rotating the pipe as you go

alternatively, get a piece of thick rectangular steel, like a strip of 1 cmm then hold one of the short edges aginst is at a similar angle as you would with the pipe and slowly start hitting it until it starts bending out. Rotate as you go

Esser · Post by **Esser** » Mon Nov 05, 2007 6:35 pm

Thank you

That's a great idea! But the jet will suck the air in more easily if the intake is flared, right?

Johansson · Post by **Johansson** » Mon Nov 05, 2007 6:51 pm

If you use a propane torch to heat the metal red hot it will be much easier to flare.

Esser · Post by **Esser** » Mon Nov 05, 2007 7:06 pm

Johansson wrote:If you use a propane torch to heat the metal red hot it will be much easier to flare.

Yes, i'm going to do that too

metiz · Post by **metiz** » Tue Nov 06, 2007 4:30 pm

Esser wrote: But the jet will suck the air in more easily if the intake is flared, right? :)

iy you don't flare it, it might nog even run at all - if you do you might even hit full throttle! FLARE FLARE FLARE :P

Esser · Post by **Esser** » Tue Nov 06, 2007 4:45 pm

metiz wrote:
Esser wrote: But the jet will suck the air in more easily if the intake is flared, right?
iy you don't flare it, it might nog even run at all - if you do you might even hit full throttle! FLARE FLARE FLARE

That's what i heard too

And i think that's the problem with my pulsejet. It will almost run when i remove the compressor. It will run on VERY little pressure from the comressor. So i think it's gonna work when i flare the pipe

Should i flare the exhaust pipe too?

Esser · Post by **Esser** » Wed Nov 07, 2007 5:29 pm

I've flared it now

but i had to cut it off the jet so i could hold it in the right way and stuff like that. But i can't borrow some welding gear right now and i haven't tested it. But i just have a question. Does it matter that it isn't a perfekt flare all the way arround? It's got the basic shape pretty nice, but since i did it with a hammer and a small steel thing it isn't totally perfekt. Is that going to have an effect?

Johansson · Post by **Johansson** » Wed Nov 07, 2007 7:31 pm

No, the flare doesen´t have to be perfect.