Theoben Theoben Rapid Rifle Pics

[Ca_Varminter]

Here is what I have collected over the years......
My first Rapid MKII with a bunch of Firsts..
First Cobra stock Paul Wilson made for the New at the time MKII.
Also it has the First Mark 4 trigger Cartridge conversion done by Allen Zasadny.. He then talked to Theoben that this conversion was Viable!!!

This is my DaveG Terminator Stock Rapid MKII with a Custom RAW QF and Brass furniture.....

Then there is the Plain Jane Rapid MKII... with Dr Bob(UK) Bottle valve QF.

For the Finisher... A Custom Chip Smith Titanium Receiver/Airtube Rapid with a custom Gordy Dawson Trigger.

 

[20caljunky]

Here is what I have collected over the years......
My first Rapid MKII with a bunch of Firsts..
First Cobra stock Paul Wilson made for the New at the time MKII.
Also it has the First Mark 4 trigger Cartridge conversion done by Allen Zasadny.. He then talked to Theoben that this conversion was Viable!!!

This is my DaveG Terminator Stock Rapid MKII with a Custom RAW QF and Brass furniture.....

Then there is the Plain Jane Rapid MKII... with Dr Bob(UK) Bottle valve QF.

For the Finisher... A Custom Chip Smith Titanium Receiver/Airtube Rapid with a custom Gordy Dawson Trigger.

Sir Yes Sir!
Quite the collection. Love it and again nice to se progression from bone stock to wild.
The Dave G stock is beautiful

 

[csdilligaf]

The Rapid design and all its iterations will always be the most simple, versatile and rugged airgun out there. Here a a few I've built from scratch. The other is my current project that is a factory Rapid made in England that I putting in an awesome stock that Martin made me 10 yrs ago. I putting a ball bearing custom trigger and balanced valve it it.

 

[woogie_man]

That blue stock is awesome sir!

 

[Ca_Varminter]

The Rapid design and all its iterations will always be the most simple, versatile and rugged airgun out there. Here a a few I've built from scratch. The other is my current project that is a factory Rapid made in England that I putting in an awesome stock that Martin made me 10 yrs ago. I putting a ball bearing custom trigger and balanced valve it it.

Hey Chip....
Have you started on that LAST Titanium Receiver For you Collection?????
Still thinking about doing that upgrade to mine??? Larger Chassis and Airtube to match????
Atb..
Stuart

 

[Hobbyman2007]

Thought I’d share a bit about the balanced valve I just finished up. A slightly extended rear cap with a 4.8mm through hole. With an internal oring to seal the stem. And a new valve stem made from 304 stainless. It’s working with a very lightly sprung SSG at 2” total length . The valve has been lengthened by 8mm vs my sketch to shorten the stroke. All other internals are stock and this can easily be reversed back to original. Yea I know there are a lot of machining marks I’m in desperate need of need of some new tooling.

 

[Jammin22]

Here are pics of the recently acquired rifle from the add. It’s a .25 and is one of the last that came from the UK. Fast flow and bottom fill currently but will be getting a RAW quick fill and gauge V block . I’ve installed a 17” LW barrel. I’ve been tinkering on it for the last few days, first was to add a picatinny rail , have a working balanced valve ( FX style exposed valve stem) a lightweight hammer with adjustable silent pip. Last but not least adding a 580cc bottle.

View attachment 543460

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Was this the one that was listed on American Classifieds? I almost bought it. It had a damn good price on it. Enjoy.

 

[mubhaur]

Theoben Rapids had much better quality than RAW guns. Amazing workmanship and anodizing.

 

[Hobbyman2007]

Not sure if the seller had it there also. I do know he goes by Warlord here and he did have it listed here not long ago. It’s one of maybe a handful I’ve seen for sale in Canada over the last ten years.

 

[csdilligaf]

Hey Chip....
Have you started on that LAST Titanium Receiver For you Collection?????

No I have not. Work for money seems to keep getting in the way of my hobby!

 

[houston]

Factory or Aftermarket stock ? Looks like a Steve Corcoran make.

 

[20caljunky]

Thought I’d share a bit about the balanced valve I just finished up. A slightly extended rear cap with a 4.8mm through hole. With an internal oring to seal the stem. And a new valve stem made from 304 stainless. It’s working with a very lightly sprung SSG at 2” total length . The valve has been lengthened by 8mm vs my sketch to shorten the stroke. All other internals are stock and this can easily be reversed back to original. Yea I know there are a lot of machining marks I’m in desperate need of need of some new tooling.

View attachment 543927

No need to apologize for tooling marks... I love the fact you designed it and executed your design then shared it with us all!
Awesome.

 

[mubhaur]

Thought I’d share a bit about the balanced valve I just finished up. A slightly extended rear cap with a 4.8mm through hole. With an internal oring to seal the stem. And a new valve stem made from 304 stainless. It’s working with a very lightly sprung SSG at 2” total length . The valve has been lengthened by 8mm vs my sketch to shorten the stroke. All other internals are stock and this can easily be reversed back to original. Yea I know there are a lot of machining marks I’m in desperate need of need of some new tooling.

View attachment 543927

Hi,
Since you are into it, I hope some of my videos on valve opening in atmosphere would be interesting for you. Link below.

Mubhaur

 

[Hobbyman2007]

Here’s a pic of the completed rifle minus the V block from RAW , I’m patiently waiting. Just finished tuning and I’m very pleased with how it worked out. From 180 bar fill to 140 bar I’m getting an es of just 20 fps. 845 to 865 . And that’s good for 4 mags ! 17” LW barrel, 580cc best fittings bottle an extra soft spring SSG and the balanced /through valve. I’ve got some vinyl coming to cover the bottle, put camo wrap on it for now as I can’t stand all the writing and logo on it. Put a Vortex 3-15x44 venom FFP mil/mil on top.

 

[Hobbyman2007]

Hi,
Since you are into it, I hope some of my videos on valve opening in atmosphere would be interesting for you. Link below.

Mubhaur

That was my inspiration for the valve I did. The rapid has much less space than the HMX . I’m still working out a few details but there may be a revision including a cobra chamber . I have all the original parts including the full length barrel , just in case I ever decide to sell( not gonna happen)

 

[mubhaur]

That was my inspiration for the valve I did. The rapid has much less space than the HMX . I’m still working out a few details but there may be a revision including a cobra chamber . I have all the original parts including the full length barrel , just in case I ever decide to sell( not gonna happen)

I can assume that even if you achieved less cocking effort and kept the OEM hammer, your lock time would have increased which is not good

 

[Motorhead]

The valve style shown in post #53 is more a Force Reduction design ... that is isolating a given percentile of the poppet head area from the high pressure within valve chamber / plenum.
The stem that goes rearward off the backside of the poppets head does not get effected by the HP air & therefore the poppet feels less weight of the HP air holding the valve closed because it now has less surface area exposed to the HP.
Result is a valve that acts as if the poppet head is a lot smaller in diameter ( less area ) and as such opens easier, that as demonstrated requires less hammer weight to operate.
* But due to now having less area the HP that is still surrounding poppet during the shot and then closing sequence, has less effect on closing the poppet after the shot ... And the WHY FOR a much stouter / heavier spring is required to speed up the closing speed. ** The heavier poppet spring is really nominal when looked at relative to the pressure on the greater exposed area that would other wise be added to the poppet if the stem headed out rear cap was omitted ( Think standard valve configuration )

The JSAR and COTHRIN balanced valve design ( And some new model PCP's coming to market recently ) take this another step .... That of adding "Pressure Assisted Closing"
Having the back of poppet similar to above getting o-ring sealed into a chamber fixed to the rear area of the valve chamber it as well isolates partial area subjected to the HP making for an easy opening poppet. But now with a neat trick !! As the valve is open the throat/transfer path is under the pressure pulse of a shot being discharged, a vent path takes this pulse and pressurizes that chamber on back of poppet effectively pneumatically slamming the poppet closed.

Yes in recent years some very unique & interesting valve tech R&D was done with some making it into production rifles. Some are fortunately able to retrofit & make the parts in doing so .... Kudo to Mubhaur for sharing his

 

[Hobbyman2007]

I can assume that even if you achieved less cocking effort and kept the OEM hammer, your lock time would have increased which is not good

I forgot about that part. The stroke length has been shortened by 8mm by extending the valve stem. To help with the lock time. I did make a light 37 gram hammer from 7075 aluminum but I don’t have the right hammer spring for it to work.