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Doomsayer Help


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#1 CROW

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Posted 31 March 2009 - 09:18 PM

Hey 'Haven. So I recently finished my first Doomsayer, and other than stabbing myself with a box cutter, it all went great. However, when I got to shoot the thing, the ranges I get are pretty dismal for a gun I was hoping to get 80 feet out of. The gun is barreled with OMC's PETG, and has a Longshot spring in addition to the original spring. Any idea's to improve ranges?
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#2 nerfboi

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Posted 31 March 2009 - 09:37 PM

Maybe it's the seal or the way your barrels are glued/attached on.
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#3 nerkum

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Posted 31 March 2009 - 09:38 PM

How is the seal from the plunger tube to the turret? You can be loosing a crap ton of air pressure there. Make sure it lines up and makes a tight seal.

Did you put any tightening rings in your PETG? They do assist with looser fitting darts.

Did you wrap the plunger head to improve the seal there? All that power in the springs needs a tighter seal at the plunger head to be effective.

If it is neither of these then I would have to see a picture of the internals to make further guesses.

Edited by nerkum, 31 March 2009 - 09:40 PM.

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#4 Echnalaid

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Posted 31 March 2009 - 09:39 PM

What kind of LS spring? Just an LS and original spring will only get you up to 70, that is of course, if the seal is good. I know the original LS spring (The silver one) is more powerful than the new black one.
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#5 Homestarune

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Posted 31 March 2009 - 09:44 PM

I'm glad to hear that you managed to build a Doomsayer. You say your ranges are "dismal". The word "dismal" doesn't give me any relevant data to help you. Is it shooting 30 feet, or is it shooting 70 feet? One of the first things I'd check is your darts, since that doesn't require opening up the gun. Springers tend to require a tighter fit than air guns. So, if your darts can fall out of your barrel, that could be your problem. If that fails miserably check the seal on your plunger, as well as your barrels to make sure you're not losing any air. That is all that comes to my mind at the moment. I hope I've helped.
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#6 AssassinNF

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Posted 31 March 2009 - 11:07 PM

The seal between the turret and the plunger tube is the most important part. It's probably your problem. My Doomsayer's ranges went up 90 feet with the addition of a single o-ring.

But we need more information to help you. Pictures would be great.
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Probably dead by now, or something.


#7 Blacksunshine

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Posted 01 April 2009 - 06:04 PM

There are many key things that can make or break doomsayer. Have you done a halfassed version and you are still calling it a doomsayer or have you done all the steps? can you post some pictures of what you have done so we can get an idea of what you have actually done? The plunger needs rebuilding and lubing, the turret needs a good seal. The spring combo I'm sure will get you the ranges you are looking for.
Dart fit is another important thing. Maybe your barrels are too long. Maybe their too short. I use 8" barrels with mine. Others have had better luck with longer barrels.
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#8 CROW

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Posted 01 April 2009 - 09:27 PM

So after reading your responses over, I'm almost positive that the great majority of my air is being lost in the plunger tube/turret seal. That was the least well done part of my gun, and I seem to have paid the price for it. Thanks for all your help, and I'll go and fix that up.
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"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#9 nerkum

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Posted 02 April 2009 - 08:31 AM

At Wal Mart in the plumbing section you can find a mixed pack of O-rings for like a buck-fifty. The medium sized ring in that pack fits the lip of the plunger tube perfectly. Super glue the o-ring to the plunger lip and you will have a great seal. That is all I did on mine and it works great. No need for the huge amounts of hot glue.

Let me know if you want to see a Pic and I will crack open my Doomsayer and snap pics.
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#10 CROW

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Posted 02 April 2009 - 08:05 PM

A picture of the O-Ring on the gun would be great when you get the chance. Thanks mate.
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"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#11 nerkum

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Posted 02 April 2009 - 08:57 PM

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#12 ninja mods

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Posted 03 April 2009 - 12:33 PM

hey, i have never owned a doomsayer but i was wondering if you could use plexiglass instead of the o-ring at the plunger/turret connection.
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#13 umpshaplapa

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Posted 03 April 2009 - 12:59 PM

hey, i have never owned a doomsayer but i was wondering if you could use plexiglass instead of the o-ring at the plunger/turret connection.

I don't know why you would. I bet it would work though.
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#14 CROW

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Posted 04 April 2009 - 03:18 PM

Thanks a bunch for the pictures! Unfortunately, out of the FOUR sizes of oring I bought, none of them fit the plunger :) Ah well, I'll keep working at it. Hopefully that, along with the JB weld I used for a seal, will improve these ranges. Thanks for the responses mates.
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"You can discover what your enemy fears most by observing the means he uses to frighten you."

"ah man, I would give you so much for one of those NIB crossbows or one of those crossbows on the floor. The ones on ebay have gone up to $59 and the shipping alone is $12." -Rip32

#15 nerkum

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Posted 04 April 2009 - 07:53 PM

Just run to Wal Mart and go to the plumbing section.

This 6 pack has the perfect size washer in it and only run about $1.50

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