Search found 3570 matches

by mark.f
Sun Aug 16, 2020 6:09 am
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 1034

Re: Arduino automated spudgun fuel injector

Let's do the math for puff metering a hybrid with a closed chamber. We'll use numbers a bit different from mine, to make the example clearer. I've sanity checked the result and double checked some of the math, but if someone wants to check and verify (both thinking and actual math) it's appreciated...
by mark.f
Wed Aug 05, 2020 8:02 pm
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 1034

Re: Arduino automated spudgun fuel injector

Nice job on the circuit. I'm a man that can appreciate the work required to compact something onto perfboard. If you're interested (probably not given the work put into the current iteration) an ATTiny takes up even less space but that's not always a priority. The TMBA's meter is pretty much it. You...
by mark.f
Wed Aug 05, 2020 7:48 am
Forum: Combustion Cannons
Topic: Arduino automated spudgun fuel injector
Replies: 9
Views: 1034

Re: Arduino automated spudgun fuel injector

Nice! I had dreamed up something similar in the shower, but using a fuel injector and alcohol since it would be easier to measure the amount of fuel injected vs. pulse width. Your idea of placing the outlet underwater under an inverted graduated cylinder was a good idea, maybe I could look into doin...
by mark.f
Thu Jul 16, 2020 11:25 pm
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 283759

Re: "Offtopic-posts-topic" NSFW

I don't know about you but no amount of fancy ARs or AKs, custom built or exotic auction win will ever seem to replace the feeling you get after completing a big "spud" launcher and firing it off for the first time. I've even had the honor to shoot .50 BMGs out here in Colorado at truly long ranges...
by mark.f
Thu Jul 16, 2020 7:20 am
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 283759

Re: "Offtopic-posts-topic" NSFW

I need to get back to building. :/ I've had AR parts lying around since last fall but I finally got around to getting a lower a month ago and have been building that instead of the cannon I need to be finishing.
IMG_0682.JPG
by mark.f
Fri Jun 19, 2020 12:15 pm
Forum: Combustion Cannons
Topic: Complete Plans for Advanced Combustion
Replies: 39
Views: 27850

Re: Re:

The fan should be placed on the other side of the spark gap or it is at large risk of being blown apart. Fan at the back is problematic? Mine is mounted about 2 inches from the rear, never had a problem or had to replace it... Sgort has been gone for several years. Last I checked his channel on you...
by mark.f
Tue Jun 02, 2020 9:45 am
Forum: Pneumatic Cannons
Topic: Calculations related to pneumatic cannon.
Replies: 9
Views: 2105

Re: Calculations related to pneumatic cannon.

I am doing a school project regarding a pneumatic cannon which able to shoot baseballs. Unfortunately, i could not find any starting calculations to it. My teacher asked me to do the calculations looking at Bernouli's equation but other than that , he is not helping much. Can you guys help ? Thank ...
by mark.f
Mon Jun 01, 2020 9:48 am
Forum: Off-Topic Hobbies
Topic: My current hobby: Cowboy Action Shooting
Replies: 12
Views: 3936

Re: My current hobby: Cowboy Action Shooting

Looks good! My mosin is earlier than 45 (barely), it's about the only gun that old I was willing to eat the cost of. :D
by mark.f
Thu May 14, 2020 8:09 am
Forum: General How-To & Discussion
Topic: Canada prohibits spudguns over 20mm
Replies: 11
Views: 2231

Re: Canada prohibits spudguns over 20mm

jackssmirkingrevenge wrote:
Thu May 14, 2020 4:57 am
The real question is what will become of my .223 stockpile without a Mini-14?
Shoulda stockpiled .308. :) I don't see anything in the new bill about something like a PTR-91 although I'm certainly no expert on Canada's firearms laws and it may have already been restricted/prohibited.
by mark.f
Wed May 13, 2020 1:58 pm
Forum: Pneumatic Cannons
Topic: Small pirate cannon
Replies: 2
Views: 673

Re: Small pirate cannon

Nice job, good to see some more of your youtube creations over here. Only criticism I really have is against the two DWV fittings you have on there. The bell reducers are the only ones I can see (you can tell because all the pressure rated fittings have longer spigots than the reducers' sockets), so...
by mark.f
Wed May 13, 2020 1:34 pm
Forum: Combustion Cannons
Topic: Potato Howitzer
Replies: 5
Views: 1018

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
Thu May 07, 2020 8:30 pm
Forum: General How-To & Discussion
Topic: Canada prohibits spudguns over 20mm
Replies: 11
Views: 2231

Re: Canada prohibits spudguns over 20mm

SpudBlaster15 wrote:
Thu May 07, 2020 5:43 pm
It won't help much if at all with the crime problem when most of the crime guns are smuggled from the US.
My bad bro. :mrgreen:
by mark.f
Sun May 03, 2020 9:06 am
Forum: SpudFiles Discussion
Topic: GGDT and HGDT
Replies: 17
Views: 5551

Re: GGDT and HGDT

PCGUY wrote:
Fri Jan 03, 2020 1:57 pm
D_Hall, do you have any of the old documentation that went along with these? Or perhaps you or someone else is willing to help create some?
No need to reinvent the wheel indeed. :mrgreen:
https://web.archive.org/web/20190321135 ... index.html
by mark.f
Fri May 01, 2020 8:12 pm
Forum: General How-To & Discussion
Topic: Canada prohibits spudguns over 20mm
Replies: 11
Views: 2231

Re: Canada prohibits spudguns over 20mm

Boooo. When did that happen?

Edit: did they bundle it with the assault weapons ban? I can't find anything.
by mark.f
Thu Apr 30, 2020 7:35 am
Forum: Hybrid Cannons
Topic: Cooking up a little something else...
Replies: 8
Views: 1015

Re: Cooking up a little something else...

Moonbogg wrote:
Wed Apr 29, 2020 11:25 pm
However, what I am trying to avoid is running over the o-ring with any kind of holes to avoid shredding it over time
Good catch.
Moonbogg wrote:
Wed Apr 29, 2020 11:25 pm
I'm excited about this project. It has double the surface area for flow from the port as my last one
Even more surface area for lightweight discarding sabots. :mrgreen: