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Proof of concept blaster that I need help with.


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#1 Eightdotno

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Posted 21 May 2017 - 04:58 PM

I have been working on this blaster for about 14 hours, any thoughts on how to make it shoot farther?

Pump action. https://imgur.com/gallery/lcdpK

Edited by Eightdotno, 21 May 2017 - 04:59 PM.

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#2 blitz

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Posted 21 May 2017 - 05:13 PM

1. Use a cpvc/pvc tee. It appears in the photo that you glued brass/copper RSCB assembly to an elbow. Using a tee will definitely help the seal and allow you to experiment with different barrel/chamber lengths.

2. shorten the stub between the elbow and the plunger tube. This reduces deadspace.

3. Seals on sledgefires tend to be pretty good stock. Did you remove the air restrictor?

4. Go to a hardware store with the stock spring and see if you can find something stronger that you can replace it with.


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#3 Eightdotno

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Posted 21 May 2017 - 05:22 PM

1. Use a cpvc/pvc tee. It appears in the photo that you glued brass/copper RSCB assembly to an elbow. Using a tee will definitely help the seal and allow you to experiment with different barrel/chamber lengths.
2. shorten the stub between the elbow and the plunger tube. This reduces deadspace.
3. Seals on sledgefires tend to be pretty good stock. Did you remove the air restrictor?
4. Go to a hardware store with the stock spring and see if you can find something stronger that you can replace it with.

1: I tried using a tee, it just makes the pump much harder.
2: the stub is that long for more ammo to be in the rscb.
3:the rscb is glued in, and yes I removed the air restrictors.
4: most of the springs at my local hardware stores are not that long or are only good for reverse plungered blasters. And also because the prime on this thing with the stock spring is extremely heavy.
ALSO, this blaster was bought from goodwill for $6

Edited by Eightdotno, 21 May 2017 - 05:29 PM.

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#4 Eightdotno

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Posted 21 May 2017 - 05:44 PM

I am also using schedule 80 1/2 in pvc pipe as both the barrel and the rscb, it only looks like brass/copper because it's been out side sitting under a tree for more then a decade and has been thoroughly cleaned.
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#5 Bubba Longshot

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Posted 21 May 2017 - 06:12 PM

You should be fine with the stock sledgefire spring as it is fairly heavy (10kg). Other then that, you should smother epoxy on all of the joints to get a really good seal.
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#6 Eightdotno

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Posted 21 May 2017 - 06:29 PM

You should be fine with the stock sledgefire spring as it is fairly heavy (10kg). Other then that, you should smother epoxy on all of the joints to get a really good seal.

Currently I do not have access to expoxy, would hot glue work?
Also it has a great dart fit with the barrel, not that much air comes out of it when I dry fire it though.
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#7 Meaker VI

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Posted 21 May 2017 - 08:24 PM

How is the elbow attached to the barrel? Just glue? You really should have a T in there, it's just the best way. If you want to make a pump-action fit easily over 1/2" PVC, you can use a bunch of couplers or IIRC 3/4" 200 PSI PVC "thinwall".

 

If it were me, I'd test that the blaster can fire through an RSCB before messing with the pump action. It may not have the plunger volume required. Build one according to this guide, exchanging your barrel material for the sleeved CPVC used in the guide. Use Sch 40 or 200 PSI 1/2" PVC for the RSCB chamber, Sch 80 might be too tight for the darts to move the way they need to.


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#8 Eightdotno

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Posted 22 May 2017 - 12:05 AM

I've seen people fire demolisher missiles off sledge fires befor with almost no issues, this thing has enough power to use an rscb.

Edited by Eightdotno, 22 May 2017 - 12:07 AM.

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#9 Meaker VI

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Posted 22 May 2017 - 08:36 AM

I've seen people fire demolisher missiles off sledge fires befor with almost no issues, this thing has enough power to use an rscb.


It's not about pure power, it's also about volume. A BBB can't always use an RSCB.
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#10 Eightdotno

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Posted 22 May 2017 - 11:22 AM

I got to thinking last night, instead of an rscb, how about an inline rscb?
Instead of using a pvc tee and elbow, why not slide the rscb in another piece of pvc?
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#11 Meaker VI

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Posted 22 May 2017 - 02:39 PM

I got to thinking last night, instead of an rscb, how about an inline rscb?
Instead of using a pvc tee and elbow, why not slide the rscb in another piece of pvc?

 

Try it, let us know how it works. That sometimes fixes the issue of an RSCB working in a blaster.

 

It's *super easy* to drop an RSCB onto something if you've already got the parts. Check that your RSCB works with something it *should definitely work on* (BBBB, Titan, homemades, maybe a BBB if you do a short barrel), then try it on the blaster you want to test it on. If it doesn't work, the blaster may not have the power to make it work.

 

I'd test it for you but I don't have a sledgefire.


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#12 jwasko

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Posted 23 May 2017 - 07:13 PM

4. Go to a hardware store with the stock spring and see if you can find something stronger that you can replace it with.

 
 

4: most of the springs at my local hardware stores are not that long or are only good for reverse plungered blasters. And also because the prime on this thing with the stock spring is extremely heavy.
ALSO, this blaster was bought from goodwill for $6

 
FYI This is a good replacement spring: https://www.amazon.c...s/dp/B000BQOUIQ
Or you can get it at Home Depot  http://www.homedepot...16084/202045472
 
Questions:
1. When you removed the air restrictors did you perhaps cause a leak between the plunger tube and the front plate (where the air restrictor was)?
2. How far is it shooting? How far do you want it to shoot? I mean, when Make Test Battle singled theirs they only got 160ft/sec max so I wouldn't expect to get yours to fire even 70feet flat especially with the stock spring.
3 What darts are you using?
 
To troubleshoot, you may want to take off the RSCB entirely. just put a single shot barrel on it and see how it shoots.

Edited by jwasko, 23 May 2017 - 07:22 PM.

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#13 Eightdotno

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Posted 23 May 2017 - 07:49 PM

Figured that I'd make a tutorial how ro make an inline rscb, since I could only find 1 mention of it, it makes the sledgefire hit a bit better, but not by much, I would love to improve upon the design, since you do not have to point it down and then back up, like a normal rscb, but I have no idea how, if anyone could make a more improved inline then I did, then please let me know.

And also, I thought I could replace the stock spring with a [k26], but I heard that it doesn't make it shoot much further.
I am also using both full length dartzone darts, and half length dartzone darts because they are cheap, and hit pretty well using the blasters I use.

Edited by Eightdotno, 23 May 2017 - 07:54 PM.

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