Search found 70 matches

by ToasT
Fri Jun 19, 2020 3:36 am
Forum: Ammo & Parts
Topic: Ideas for biodegradable cannon-balls
Replies: 15
Views: 3475

Re: Ideas for biodegradable cannon-balls

I have used clay, it needs to be dried for several days, the larger, the longer it will require. If not dry, it tends to splatter and leave the barrel as a cloud. Clay will tend to shrink quite a bit, and depending on the clay, shrinkage is not consistent, so it can be a pain getting the size right....
by ToasT
Fri Jun 19, 2020 3:13 am
Forum: Hybrid Cannons
Topic: Port size vs performance
Replies: 8
Views: 1008

Re: Port size vs performance

Not that I have much to add to this, but It's threads like this that make me a fan of spudfiles.
by ToasT
Mon Dec 02, 2019 7:59 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Fridge compressor dead?
Replies: 5
Views: 3029

Re: Fridge compressor dead?

Stay safe friend. Mains voltage isnt something to play around with, or trial and error and i just want to let you there are potentially serious dangers here, its the second video in your first post that has me concerned. However you are doing the right thing by researching and asking others and have...
by ToasT
Tue Nov 05, 2019 5:14 am
Forum: General How-To & Discussion
Topic: Homebuilt PCP pump
Replies: 3
Views: 2394

Re: Homebuilt PCP pump

Looking good! My one concern would be the threaded rod rubbing against the endcap that will wear over time. Yea that will definitely happen. I could fill in the threads with epoxy to minimise the wear, but I'm happy to treat it as a sacrificial part as its easy to make another. It should last a rea...
by ToasT
Sun Nov 03, 2019 4:00 am
Forum: General How-To & Discussion
Topic: Homebuilt PCP pump
Replies: 3
Views: 2394

Homebuilt PCP pump

So, I moved to a bigger property, which has many places to shoot that are no where near a power point for the old fridge compressor. I don't fancy lugging a generator around or dealing with high pressure air, so I made a hand pump. The pump is a 20mm copper pipe brazed into a 20mm fitting with a cus...
by ToasT
Sun Nov 03, 2019 3:06 am
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 267483

Re: "Offtopic-posts-topic" NSFW

jackssmirkingrevenge wrote:the epoxy batcave will shortly become reality
Damn that's exciting, looking forward to seeing some epoxy marvels!

Mortgage life also happened here recently. Made sure to get a full 10 acres with a nice big hill backdrop. Or should I say backstop?
by ToasT
Fri Oct 25, 2019 4:24 pm
Forum: Pneumatic Cannons
Topic: French pneumatic mortars in WWI
Replies: 26
Views: 14135

Re: French pneumatic mortars in WWI

I found this great page Nice find, I had looked at this thread a few months back and wondered how these actually worked. Topically, I decided a while ago now that the game of p├ętanque could be vastly improved with the addition of a mortar and a bigger field of play. Hopefully in the next few months...
by ToasT
Tue Nov 06, 2018 4:04 am
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 267483

Re: "Offtopic-posts-topic" NSFW

Anyone here messed with drones? A few years ago I built a quad with the intent of long flight times and the ability to carry a camera, even autonomous flight on preset 'missions'. Can't really say it was a success, could never really get rid of vibrations affecting the image. Maybe if i spent a bit...
by ToasT
Mon Aug 01, 2016 4:50 am
Forum: Combustion Cannons
Topic: Slow Motion Combustion Video
Replies: 13
Views: 2253

Re: Slow Motion Combustion Video

Yea i forgot to mention that the effects here are maybe the last few things to optimise to get the best performance. These are still things that you might want to consider even after you have picked the low, and big fruits, of additional spark gaps. Id still be interested in seeing a simulation of s...
by ToasT
Thu Jul 28, 2016 4:04 am
Forum: Combustion Cannons
Topic: Slow Motion Combustion Video
Replies: 13
Views: 2253

Re: Slow Motion Combustion Video

My take away from this is you ideally want to minimise the surface area to volume, ie as spherical as possible, and ignite the mix from the centre ish. This gives you the greatest flame front area, which i take to mean the greatest rate of combustion and therefore pressure. I say ish, because maybe ...
by ToasT
Thu Jun 23, 2016 6:02 am
Forum: Combustion Cannons
Topic: Slow Motion Combustion Video
Replies: 13
Views: 2253

Slow Motion Combustion Video

Came across this on youtube.

[youtube][/youtube]

Several things here, that if not of general interest, could be useful when designing combustion cannons.
Like the wall cooling effect.
by ToasT
Thu Feb 18, 2016 3:24 am
Forum: Pneumatic Cannons
Topic: full size football
Replies: 6
Views: 1165

Re: full size football

AlfiePB IanB wrote:There is a combustion cannon firing a soccer ball on YouTube
[youtube][/youtube]

skip to 2:30
by ToasT
Fri Feb 05, 2016 11:46 pm
Forum: Off-Topic Hobbies
Topic: Possible AC Scroll Compressor Conversion?
Replies: 9
Views: 1360

Re: Possible AC Scroll Compressor Conversion?

If you find the spec sheet for the compressor it will say if it needs a start or a run capacitor. If running for a long time on a wrong sized run capacitor I think you run the risk of burning out the windings.
by ToasT
Sun Jan 31, 2016 7:23 pm
Forum: Off-Topic Hobbies
Topic: Possible AC Scroll Compressor Conversion?
Replies: 9
Views: 1360

Re: Possible AC Scroll Compressor Conversion?

I think the ratio of scroll vs reciprocating compressors comes down to number of fridges vs number of heat-pump/air con units. Scrolls are used in heat-pumps/air-conditioning units where the temperatures don't need to be dropped as far in refrigerators. Refrigerators use reciprocating piston compres...
by ToasT
Sat Jan 16, 2016 5:40 am
Forum: Hybrid Cannons
Topic: Propane Sensor Fuel Metering
Replies: 3
Views: 1439

Re: Propane Sensor Fuel Metering

I had thought about making an electronic fuelling device, using a pressure transducer and a meter pipe. Could be further automated with solenoid valves, but how close do you want your flammable gasses to your electricity? Further ideas I had; The mix number can be controlled with a dial (rotary enco...