Search found 4928 matches

by Mike Everman
Sun Aug 26, 2018 8:32 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 106755

Re: Mike's Build Log

Hey Nick, hope all is well! Need to come out there in '19 for sure. I'd like to see this one too as it's been percolating for a long time, so am laying in some supplies. But anyone that reads this thread knows I'm all talk until I am not! I've had to scale back on work a bit for my sanity, so am ima...
by Mike Everman
Sun Aug 26, 2018 4:56 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 106755

Re: Mike's Build Log

So I've got this notion to make a PJ powered bike out of a 1L pocket jet I have. Just go for a simple free turbine and gear it all down. I do not care about how fast I go, gearing it for 10-15ish MPH(?), assuming 100m/sec achievable tangential velocity(?) I do not have any interest in using a PJ big...
by Mike Everman
Sun Aug 26, 2018 4:37 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 16354

Re: Quartz

I just ordered the diamond wire saw blade and holder as well. I also got a set of diamond files: https://www.amazon.com/gp/product/B00PAQWTI0/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 My clockmaking buddy says he cuts tube by scoring it with a triangular diamond file and snapping it with his hands...
by Mike Everman
Fri Aug 24, 2018 11:47 pm
Forum: Ramjet forum
Topic: Subsonic Ramjet Design Project
Replies: 15
Views: 1123

Re: Subsonic Ramjet Design Project

I don't know much about them, though I do know that getting a flow to stick to a wall that diverges more than 30 half angle would be a problem. Flat walls will need to be a honeycomb panel or otherwise greatly stiffened. You will be fighting drum head modes of vibration in flat walls.
by Mike Everman
Thu Aug 23, 2018 2:10 pm
Forum: Ramjet forum
Topic: Subsonic Ramjet Design Project
Replies: 15
Views: 1123

Re: Subsonic Ramjet Design Project

Better. That last one I thought had too steep a diffuser.
by Mike Everman
Thu Aug 23, 2018 2:08 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 16354

Re: Quartz

Cool. I get dibs when you go off to the hoarder’s hospital.
Ha
So, do you think the guys that did your quartz jam could blow a whole pulsejet?
Who did you use, and did you have a good experience with them?
by Mike Everman
Mon Aug 20, 2018 4:40 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 16354

Re: Quartz

Hey Mark, hope all is well! Getting ready to cut some of that Quartz tube you sent me lo these many years hence. I wonder if scoring it in the lathe with a glass cutter and break will work? I do need to grind the ends flush to a specific length, too. As I recall but can't find it was you were a fan ...
by Mike Everman
Wed Aug 01, 2018 1:16 pm
Forum: Valved pulsejet forum
Topic: dynamic modeling of a strip valve
Replies: 144
Views: 2848639

Re: dynamic modeling of a strip valve

You and me both. It was a fine piece of work. I made him a moderator so he could edit this thread to his heart’s content, hoping he’d embed his figures, but he hosted them all on free picture services that went away.
Tragic.
by Mike Everman
Sun Jun 24, 2018 5:41 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 374
Views: 1745363

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

Liking all this! So, what I liked about the Harbor Freight burner (I've had one for years) is it's a cheap way to get a nice high flow needle valve with all the hookup stuff to the tank. Though I mostly use just the tank valve which takes a fine touch when starting a small linear like this with comp...
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: 374
Views: 1745363

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: 374
Views: 1745363

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: 374
Views: 1745363

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: 374
Views: 1745363

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: 1326

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: 1348

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 ...