Tuning Any tips for tethering an RTI Prophet?

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ceyik51533gu

Member
Nov 6, 2020
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MA, Belize
I'm trying to get my prophet working with an external inline regulator hooked up to the rear port with little success. I can't find any information online or on the RTI site about how it's supposed to work.

Hundreds of results saying that you can do it, but no one talking about how they actually did it...

When I hook the regulated air up to the rear port with the buddy bottle off the air dumps through the barrel, or through the transfer port if it's cocked.

If the buddy bottle is on, then it just fills the bottle.

I assumed that there was some release inside the the gun that restricted air after you take the bottle off but if there is I can't find it.

Anyone here ever tether a prophet?

I've asked RTI but they've ignored my last two emails so hoping someone here can help.
 
I forgot all about tethering my 25 Prophet, I get a LOT of shots out of my bottle shooting 880 FPS shooting 34 gr JSBs , I will watch this thread close and see what the problem is,,,, And I keep forget to count my shots ,,,, 

Mike

Click to expand...

I'm trying to dial in a .30 barrel and a lot of different kinds of slugs and pellets. Want to have the reg on the bench in front of me to adjust without propping up the gun and messing with allen keys so much. 
 
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This is perplexing. When you tether to the fitting on the back of the gun, you are hooked directly to the plenum. I could understand having an issue with air blowing out the front of the receiver where the bottle was attached if whatever kind of one way valve they have in there failed. I just don’t understand why you blow air past your poppet filling the plenum one way and not the other. You said air dumps through the TP and out the barrel. That only happens if air gets past the poppet. Weird.
 
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I would cock the gun and open the valve on the big tank extremely slowly.

If still leak out through the barrel I would double load 2 lubed felt cleaning pellets or 2 pellets pointed in a very safe direction.
Click to expand...

This 👆 how my PP750 worked once as well...needed to stress the poppet to close. Have you by any chance replaced the valve spring to a softer and the hammer locks the valve poppet?

Btw, I don't have the RTI, just hijacking
 
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I would cock the gun and open the valve on the big tank extremely slowly.

If still leak out through the barrel I would double load 2 lubed felt cleaning pellets or 2 pellets pointed in a very safe direction.
Click to expand...

This 👆 how my PP750 worked once as well...needed to stress the poppet to close. Have you by any chance replaced the valve spring to a softer and the hammer locks the valve poppet?

Btw, I don't have the RTI, just hijacking
Click to expand...

Good question but no, it's still the stock performance version of the gun.

I tried again today with variations of cocked/uncocked, bottle on/off, slow/fast fill, etc. I tried blocking the transfer port to see if that would shake the poppet loose but the air just moved from the TP to out of the hole where the bottle used to be. 

Starting to wonder if I might be the first person to try this on a prophet...


 
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Unless RTI responds to my email I'm thinking I'll have to simply plug the bottle port. Apparently it's a "G1/2-14" thread.

Not sure what that means though.Is that the same a BSP? NPT? Anyone know where I can get a fitting for that? 

Amazon shows results for "G1/2-14 male fitting" but I don't know if that means the length and ID/OD of the bolt is going to work.
 
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When you have the bottle on the front of your gun and it’s full air, when you take it off, does your plenum still have air in it? Can you fire a couple shots after you take the bottle off? If not, that means when you take your bottle off, your plenum drains. You will never be able to tether on the rear port if your gun won’t hold its plenum pressure once the bottle is removed.
 
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I can't take the bottle off when it's full of air with the externally adjustable regulator on the prophet. The manual states that "Please note that regulator does not have a closing valve, so if you remove the bottle (with the regulator) from the rifle, all air will be released from the bottle." I have to degas from the butt plate first. 

That's a good thought about the plenum. I just degassed again and there is no air in the plenum. I don't know if the rear butt plate valve is supposed to vent the plenum as well?




 
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Well I can tell you that early RTI’s had a pin valve on the reg. You could take the bottle off without degassing. If you look in the front of your gun with the bottle off, you might see the little nub that depresses the pin valve on a reg. My Priest ll has it. Maybe RTI got so caught up in building a better reg that they abandoned the pin valve. Here are a couple regs I used on my gun and even the one RTI built for me has a pin valve.
image_2.1610938004.jpg

 
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I would just leave the bottle on the gun and use THIS! I have several dont ask why but they are perfect to experiment for different reg pressures for determining what reg setting/pressure ANY PCP GUN prefers for accuracy but I am only onto pure accuracy and not power so it may not apply to most power hungry shooters who prefer power over accuracy.

https://airtanksplus.com/product/regman2-external-pcp-airgun-regulator/

It is worth buying.


 
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