Search found 4904 matches

by Mike Everman
Fri Jun 22, 2018 6:41 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

pressure is irrelevant. I've never used a heat gun, personally. Have a compressor and a blow-off gun with a nice smooth trigger? Fine low-end control is required. I've seen a leaf blower used on a tiny motor, but it was a study in getting just the very fringe of the flow to sneak in the outer edge o...
by Mike Everman
Fri Jun 22, 2018 4:22 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

You do have the BBQ igniter that has a battery, right? The manual pushbutton type is a pain. I usually put a rubber band around so it tiks without an assistant, though it is a fun way to get my kids involved.
by Mike Everman
Fri Jun 22, 2018 2:46 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

You’ve made me dredge up other pipe fitting work, the weldless chinese:
viewtopic.php?f=3&t=2786&start=30#p34181

That one was fun.
by Mike Everman
Fri Jun 22, 2018 4:21 am
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

Ah, a trickle of everything is needed until you start getting BANG! Everything open but the needle valve. Slowly crack that, and i mean minimal. Trickle air, like a badger fart. Every pop in the pulsejet cycle, when you actually get a cycle, is a small amount of fuel. You need to get some good ol ca...
by Mike Everman
Thu Jun 21, 2018 11:08 pm
Forum: Valved pulsejet forum
Topic: 100mm Zanin Z26
Replies: 2
Views: 719

Re: 100mm Zanin Z26

Got a pic of it running, Nitro?
by Mike Everman
Thu Jun 21, 2018 11:05 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 5
Views: 684

Re: Annular M20

I think I've boiled the "why annulars suck" to three things. 1. It violates a simple axiom of having the least surface area for a given volume, the king there being a cylindrical tube. Annular skin drag on the flow is always higher in the all important intake (2x+). 2. If you could, you'd have your ...
by Mike Everman
Thu Jun 21, 2018 12:18 am
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

I see what I had was a 3/32" fuel stinger, bent and pinched a little. You really want a little exit hole for the fuel injector, like 1mm is the upper end, and there are several positions and angles that work and many that don't. did you see this post? http://www.pulse-jets.com/phpbb3/viewtopic.php?f...
by Mike Everman
Wed Jun 20, 2018 9:02 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 365
Views: 1732159

Re: Please put your "I am new and need help" question here.

The only fuel tube I got to work on that was 1/8" dia copper, with a little bend at the end (or was it nipped at 45?) murky memory, have to read my own thread on it. Did you do the rounding of the intake edge, making the flare? Till you heat it up some, less air and less fuel until you get some real...
by Mike Everman
Wed Jun 20, 2018 8:09 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 33
Views: 3654

Re: Valveless pulsejet-computational fluid dynamics

Loving that first animation, Zono. Wish it went longer to see the pressure peak happen again in the CC. Love the way it shows the rarefaction waves colliding in the tail, where it would love to collapse if we use too thin a material!
by Mike Everman
Wed Nov 01, 2017 4:49 am
Forum: Off topic forum
Topic: youtube
Replies: 1450
Views: 148077

Re: youtube

I want to make a big putt-putt boat. have a meet and do races or something
by Mike Everman
Thu Oct 26, 2017 7:36 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 269690

Re: Odds and ends

yeah, go Mark! When you settle on a good vendor, I want to send them a drawing of a pocket jet and see how much they'd charge. I might be talked into bankrolling a quantity of these little guys... noodge noodge, wink wink!
by Mike Everman
Tue Oct 03, 2017 2:14 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 269690

Re: Odds and ends

Love those little guys! Trying to catch up after a long work stint. Some weeks away from experimentatation still, unless I check responsibility at the door one day!
by Mike Everman
Tue Oct 03, 2017 2:05 pm
Forum: Jet Vehicles, All Types
Topic: New Vehicle Forum
Replies: 8
Views: 5754

Re: New Vehicle Forum

Ha! Do tell...
by Mike Everman
Tue Sep 19, 2017 11:55 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 269690

Re: Odds and ends

Hey, I was watching the budweiser snorkeler, and it runs well! Years ago I was trying meth soaked disks of fabric in the bottom to try and eliminate slosh wierdness. What do you think of a disk of sponge, again soaked, kind of acting like a wick? In other news, I did a jamjar lid out of silicone she...