Search found 4972 matches

by Mike Everman
Mon Jan 16, 2023 5:32 pm
Forum: Valveless pulsejet forum
Topic: More free plans: 40 pound Chinese
Replies: 184
Views: 803105

Re: More free plans: 40 pound Chinese

Great! Nice run to start a year that can only be better than last year!
I gotta get out and make some flame and noise. Thanks for the inspiration.

Hope all is well otherwise, Joost!
by Mike Everman
Tue Jan 03, 2023 9:19 pm
Forum: Ramjet forum
Topic: The Great Ramjet Challenge!!!
Replies: 311
Views: 241782

Re: The Great Ramjet Challenge!!!

Great, can't wait!! Not much else going on around here.
by Mike Everman
Sun Nov 27, 2022 3:33 pm
Forum: Ramjet forum
Topic: The Great Ramjet Challenge!!!
Replies: 311
Views: 241782

Re: The Great Ramjet Challenge!!!

I reminisce often. Wish there were more going on with this forum! Hope all is well!
by Mike Everman
Thu Mar 24, 2022 10:24 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

It's the 90-90 rule:
The first 90% of the job takes 90% of your time.
The last 10% takes the other 90% of your time.

Sad to say, I've got to hit the road for the weekend tomorrow morning to visit a dear and terminal friend, so our collective jollies will have to wait...
by Mike Everman
Wed Mar 23, 2022 4:01 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

GAaa, well, I've got to get more serious about my plumbing. I've always used the tank valve, so me little push fittings and plastic tube never developed any appreciable pressure. Now, I'm valving in two places at the motor, and multiple shenanigans have ensued! I am running into this a lot these day...
by Mike Everman
Tue Mar 22, 2022 1:54 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

I am GMT -7
Best I can do is about 5pm today my time, sorry!
by Mike Everman
Tue Mar 22, 2022 4:10 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

All ready to go! I found some tiny tapered carbide endmills in the “box of woe”, looks like the nose of it is .025”. Punched in quite nicely. 27906E6A-53E2-46F7-BDA3-885A5B929489.jpeg D770F15D-1751-451D-9F51-9BB6BC77DF09.jpeg The starting stinger has metering and a pushbutton switch. I’ve got a valv...
by Mike Everman
Sun Mar 20, 2022 6:49 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

It’s definitely going to work.. I hooked up the stinger and got a great starting resonance and grumble.
Bad news is the stainless has work hardened somehow, and is just undrillable. I need some carbide bits to continue.
by Mike Everman
Sun Mar 20, 2022 2:26 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

So, about to drill five fueling holes in the CC. I’m torn between tiny, like .03”, but my 1/16” drills look quite tiny as well. I don’t think it is any simple area/flowrate calc, because the fuel jet velocity is a huge variable. The question is: Better to be smaller, energetic and turbulent delivery...
by Mike Everman
Wed Mar 16, 2022 1:53 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

Mark, if you look at the first photo, they are freshly printed and still in the powder bed. The support is the comb like support features that must be removed by hand. Nick, yes it is the same material. They printed the “stomach” (tough not to call it that now!) u-bend up, and so I find support ribs...
by Mike Everman
Tue Mar 15, 2022 4:45 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

So, I've got the 5 fueling access ports tapped and pluggable, and now I'm down to selecting the fueling hole diameter that will shoot inward at a 45 deg angle. Too big and I can't fix it, so I'm torn. pjsls full.PNG pjsls cutaway.PNG I've taken to thinking I want tiny holes, but stiff jets seems dis...
by Mike Everman
Tue Mar 15, 2022 1:44 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

Mark wrote:
Tue Mar 15, 2022 5:21 am
I was wondering how many bananas does it weigh?
Hi Mark,
It is approximately 3.5 bananas, if bananas are 3/lb. ha
by Mike Everman
Mon Mar 14, 2022 3:29 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

Yeah, I’ll do a few tests at nipping it to make a Rosscojector, but when you think about the area we are talking, the holes i was experimenting with were around .5mm. A nip or slit just seems too hard to replicate, or hit any specific area in production. Maybe it’s not that finicky…. I’m pointing do...
by Mike Everman
Sun Mar 13, 2022 9:14 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

Well, only one didn't have support material in the CC. And the fueling holes are clogged with support material too. I’ve gotten it just far enough to try the starting stinger: 8DE4670B-F8B0-4F55-93F6-8604E9BBCCD0.jpeg Need to find my dinky drills. I think a good starting point for this stinger is .5...
by Mike Everman
Sat Mar 12, 2022 5:41 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 434
Views: 285151

Re: Mike's Build Log

Here you go, Simon, bananarama:
banana.PNG