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by mark.f
Fri Apr 10, 2020 9:50 pm
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Re: "In the world of spuds today"

ITWOST (and I realize nobody asked) The last holdout from my pre-Marines-days got decommissioned today because I haven't bothered to replace the mixture fan in it since 2014~ish, and I needed the 3" (pressure rated) pipe for another project (managing so far to build everything with stuff I had alre...
by mark.f
Sat Apr 11, 2020 9:42 am
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Re: Self contained airsoft, pump action.

Ah, that makes sense. I should probably invest in making some of those since all I have are rings and buckets of sand to use until the gyms open back uip.
by mark.f
Wed Apr 15, 2020 10:14 pm
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Re: Question regarding spigot mortar style ammo.

Not only do you have the dead space to contend with, but the pressure will be acting on a smaller surface area than it would with a barrel which fit the same sized projectile (if that makes sense), so you would almost always be better served (performance-wise) making a barrel larger than your projec...
by mark.f
Sat Apr 25, 2020 6:14 am
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Re: New member... my baby, Big Red

What's the construction? Using pure oxygen + fuel in plastic piping isn't a great idea. Maybe that's why you didn't actually fire the thing in the video.
by mark.f
Fri Apr 03, 2020 8:21 am
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Re: Pnuematic Cannon Making Very Loud Noise....!

The valve is "honking", which happens when your pilot doesn't let out enough air and the diaphragm attempts to reseal itself rapidly. The included solenoid is usually very low flow, designed to pilot the valve at normal water pressure. Since air is compressible, you usually need more flow for your p...
by mark.f
Mon Apr 27, 2020 11:35 am
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Re: New member... my baby, Big Red

"pure oxygen" and fuel? Maybe you noticed the vacuum pump hidden in the battery box that evacuates the chamber before filling it with "pure oxygen and fuel". I didn't notice much of anything since you just posted a video. ;) You sound pretty smart, we just tend to get nervous when people post pictu...
by mark.f
Wed May 13, 2020 1:34 pm
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Re: Potato Howitzer

Nice! I'm very impressed by all the "errata" like the homemade scrap elevation adjustment and frame. I can tell a lot of persistence was required to get all of that to fit together, good job! Few suggestions: 1.) As far as the recoil springs, they probably won't do much with light projectiles like l...
by mark.f
Mon Apr 13, 2020 10:10 am
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Re: "Offtopic-posts-topic" NSFW

drac wrote:
Mon Apr 13, 2020 1:37 am
my ex-wife decided to sell them on me. :cry:
I think JSR just had an aneurysm. :mrgreen: