Title: Revising the APR Line
DX - July 2, 2006 04:25 AM (GMT)
Lucky that I haven't posted directions or many pictures yet, meaning that the change will not confuse anyone. Instead of 5 progressively larger homemades, the names will be based on the pipe size of the top of the pc.
APR 1000 = 1" pc [probably won't bother building]
APR 2000 = 2" pc [current APR 1000]
APR 3000 = 3" pc [current APR 2000]
APR 4000 = 4" pc [currently in progress]
So the name switch only affects two guns, with the APR 500 being dropped altogether. Since the pcs can be any length, this leaves plenty of wiggle room if others want to amend the specifications. It is also not based on whether there is a backpack or reservoir, so again, lots of room for making the same gun with different specs if one wants to.
A sneak peak at the APR 4000 in progress:
Yeah, that's a 4" pc with a 3" reservoir and 1/2" pump. This gun will mean business.
APR 1000 = 1" pc [probably won't bother building]
APR 2000 = 2" pc [current APR 1000]
APR 3000 = 3" pc [current APR 2000]
APR 4000 = 4" pc [currently in progress]
So the name switch only affects two guns, with the APR 500 being dropped altogether. Since the pcs can be any length, this leaves plenty of wiggle room if others want to amend the specifications. It is also not based on whether there is a backpack or reservoir, so again, lots of room for making the same gun with different specs if one wants to.
A sneak peak at the APR 4000 in progress:
Yeah, that's a 4" pc with a 3" reservoir and 1/2" pump. This gun will mean business.
sbell25 - July 2, 2006 08:30 AM (GMT)
Wow...that thing is a beast. I would love to be able to get pressure rated PVC over 2" so I could build something like that, but sadly 2" is the limit of what I can find.
Won't the weight of the water in a full 4" PC put a bit of a strain in the elbow joint before the 2nd check valve? Or are you going to support it somehow?
Won't the weight of the water in a full 4" PC put a bit of a strain in the elbow joint before the 2nd check valve? Or are you going to support it somehow?
Doom - July 2, 2006 12:50 PM (GMT)
A little strain would exist, but I doubt it would do any harm. It'll take quite a lot of bending to break the joint or pipe. I'm assuming too that he'll add a support.
Check McMaster-Carr if you want pressure rated 4 inch pipe too. No pressure rated pipe that large was available to me locally until recently, and I ordered a big segment of 4" pipe from them before. The pipe is the same stuff I get locally, just a little more expensive due to shipping.
Other than that, this looks pretty interesting. I'd like to see how well the 4" chamber works in this application. From my experience with 4" chambers, the power is much greater than would be a normal chamber simply due to the total surface area. With a half-inch pump, you should be able to get great pressure with this and that pressure will translate into a lot of force! Of course, recharge time wouldn't be too great, but that's what shot time is made for (at least in my opinion). ;)
Check McMaster-Carr if you want pressure rated 4 inch pipe too. No pressure rated pipe that large was available to me locally until recently, and I ordered a big segment of 4" pipe from them before. The pipe is the same stuff I get locally, just a little more expensive due to shipping.
Other than that, this looks pretty interesting. I'd like to see how well the 4" chamber works in this application. From my experience with 4" chambers, the power is much greater than would be a normal chamber simply due to the total surface area. With a half-inch pump, you should be able to get great pressure with this and that pressure will translate into a lot of force! Of course, recharge time wouldn't be too great, but that's what shot time is made for (at least in my opinion). ;)
DX - July 2, 2006 03:29 PM (GMT)
This gun shows what I've learned, and one thing is that wider pcs yield greater power. So I decided to throw in 4" as part of the pc. The gun will be supported with duct tape and styrofoam, otherwise I wouldn't be able to use it very well. I'm also hoping that this gun won't be too top-heavy.
While the pc will guzzle water, that's what tap/pump is for. The whole reservoir becomes one big shot broken up into dozens of tap shots.
While the pc will guzzle water, that's what tap/pump is for. The whole reservoir becomes one big shot broken up into dozens of tap shots.
sbell25 - July 2, 2006 10:14 PM (GMT)
| QUOTE |
| Check McMaster-Carr if you want pressure rated 4 inch pipe too. No pressure rated pipe that large was available to me locally until recently, and I ordered a big segment of 4" pipe from them before. The pipe is the same stuff I get locally, just a little more expensive due to shipping. |
I'd like to, but I imagine the shipping costs for a length of PVC pipe from America to New Zealand wouldn't be cheap. Plus, any fittings over 2" cost a lot as well...e.g 3" to 2" reducers cost $20 each. I imagine that a 4" to 2" reducer would cost even more. Oh well.
About the 4" PC, would two 3" PC's have a similar amount of power because the total surface area is nearly the same?
SilentGuy - July 8, 2006 05:43 PM (GMT)
@ sbell25: Yup, that's right. Actually, 2 * 3" is 18/16 or 9/8 the size of 1 * 4", so you'll actually be better off. That said, Duxburian's unique inverted-T design that I barely understand throws in a few different factors--but for most PCs, you're right. Two 3" PCs provide twice the power of one of them, unless Doom's calculations turn out wrong after all.