Search found 176 matches

by mrfoo
Fri Sep 11, 2020 5:40 am
Forum: SpudFiles Discussion
Topic: pages won't open
Replies: 17
Views: 470

Re: pages won't open

All appears to be working again for me, many thanks to @PCGUY
by mrfoo
Mon Sep 07, 2020 1:44 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Let's talk nerf blasters
Replies: 4
Views: 140

Re: Let's talk nerf blasters

I could always make my own, but it would be too powerful and might kill someone, so that idea is out.
I thought that was the idea?

Seriously, though, 150 bucks for a (high performance, admittedly) plastic toy gun? Tha fukk? I'd be far more inclined to try the nexus pro.
by mrfoo
Sun Aug 30, 2020 3:36 am
Forum: SpudFiles Discussion
Topic: pages won't open
Replies: 17
Views: 470

Re: pages won't open

It certainly seems that any access to viewtopic.php with the 'p' parameter set causes a 500. https://www.spudfiles.com/viewtopic.php?f=6&t=27162 gets me to this thread mostly OK, but https://www.spudfiles.com/viewtopic.php?p=388828#p388828, which should take me to the first post of the thread hard 5...
by mrfoo
Sun Aug 30, 2020 3:34 am
Forum: SpudFiles Discussion
Topic: pages won't open
Replies: 17
Views: 470

Re: pages won't open

could be a link thing, I had to try different links until I got here this time I thought so, and it seemed to be that for a while specifically with some more complex links (trying to access a particular post in a thread, for example), but I'm getting random 500s even on direct access to this thread...
by mrfoo
Sat Aug 29, 2020 3:50 pm
Forum: SpudFiles Discussion
Topic: pages won't open
Replies: 17
Views: 470

Re: pages won't open

Not just you. There's something very b0rked.
by mrfoo
Fri Aug 28, 2020 11:28 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Full auto airsoft pistol
Replies: 3
Views: 407

Re: Full auto airsoft pistol

Video or it didn't happen :)
by mrfoo
Sun Aug 23, 2020 4:17 am
Forum: Hybrid Cannons
Topic: Autonomous pistol .22
Replies: 5
Views: 295

Re: Autonomous pistol .22

Ooooh, I like that. I assume the part that eventually needs replacing is the o-ring?
by mrfoo
Sat Aug 08, 2020 1:07 am
Forum: Hybrid Cannons
Topic: Cooking up a little something...
Replies: 79
Views: 13830

Re: Cooking up a little something...

Wow, missed that update, came back here from the link you posted elsewhere. 100% success indeed. 1067fps for a golf ball means you're basically being maxed out by the shock wave, i.e you're hitting the sound barrier. This makes me wonder what could be done with a streamlined projectile of the same c...
by mrfoo
Sun Jul 19, 2020 1:59 pm
Forum: General How-To & Discussion
Topic: JSR's workshop chronicles
Replies: 32
Views: 7507

Re: JSR's workshop chronicles

that is my understanding, yes.
by mrfoo
Tue Jul 14, 2020 12:44 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 100032

Re: Short question topic

His explanation of how it works is dead wrong, the pressure in the two chambers will always equalise. The principle at work is exactly the same as that of a QEV, the force exerted on the piston at the "bulb" end is gas pressure * piston cross sectional area, and at the strut end it's gas pressure * ...
by mrfoo
Mon Jul 13, 2020 3:38 am
Forum: Off-Topic Hobbies
Topic: Interesting To Know
Replies: 3
Views: 338

Re: Interesting To Know

Interesting, but if you're talking about "shop sci-sc-sci-science!", you probably should spend the first part of the video talking about how much "power" you're getting from a screw press. Also, he keeps going on about friction being the killer, but it's clearly not, as shown by his grease test. In ...
by mrfoo
Sun Jun 14, 2020 4:12 am
Forum: Ammo & Parts
Topic: Ideas for biodegradable cannon-balls
Replies: 15
Views: 3477

Re: Ideas for biodegradable cannon-balls

I'd guess a simple flour / water paste would work. Plain flour, though, not self-raising.
by mrfoo
Fri Jun 12, 2020 6:10 am
Forum: Hybrid Cannons
Topic: Port size vs performance
Replies: 8
Views: 1010

Re: Port size vs performance

Quite. There's going to be a point of diminishing returns where, for a given design and geometry, going bigger will eventually slow the piston down. There's a lot of benefit to be had, for a port that's smaller than the barrel, from profiling the edges of the port, both chamber side *and* barrel side.
by mrfoo
Mon May 25, 2020 5:51 am
Forum: Combustion Cannons
Topic: I was hoping for some feedback on my oxy-propane combustion cannon.
Replies: 7
Views: 913

Re: I was hoping for some feedback on my oxy-propane combustion cannon.

Personally, I wouldn't use PVC for anything involving compressible fluids at pressure, certainly not for combustion chambers, and doubly not so for anything involving oxy-gas mixtures. But that's just me, I like to keep the parts of my body complete and attached where they are. For air and propane, ...
by mrfoo
Mon Apr 27, 2020 1:18 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with making a diy blowback system
Replies: 7
Views: 1197

Re: Help with making a diy blowback system

Boyle's Law tells us that, for a constant temperature, pressure is inversely related to volume, so for a fixed quantity of gas, if we reduce the volume by a factor of 2, we raise the pressure by a factor of 2. So, if we assume you have a 100mL chamber at atmospheric pressure, and you want to raise i...