Which is in a nutshell ... Is on purpose misaligned of the transfer path. A very crude way to do it, tho it would work tho lacking any real practical miens in scaling the rotation.
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RAW Rapid Tuning a RAW HM1000 for 12fpe
- Thread starter BrazosbyNemo
- Start date
It sounds to me Mr Motörhead, that you and I tune rapids/raw in a very similar manner.
Living in the uk I almost exclusively work on sub12fpe rapids/RAW although I do have knowledge of high and very high powered versions.
The most obvious methods of adjusting power are, hammer spring tension, reg pressure, transfer port size and barrel length. There are a few others, pip length on the hammer, hammer weight and inertia weight, weight.
The genius of the rapid/RAW design is its simplicity and ease of maintenance.
Having a selection of different length/ power springs is a cheap and easy install.
Setting reg pressure is not difficult but having a couple set to different pressures is not prohibitively expensive and makes things easier.
Longer barrels with bigger ports give more power, having a couple of different barrels is an easy swap OR have one barrel with an index thimble were you can swap transfer port size is another option. OR a selection of valves with the same front port diameter but different top ports, this is more crude option but does work.
Older RAW and Theobens had a screw in pip, (Newer hammers with integrated pip is a backward step IMO) shorter pips allow the hammer to travel further, attain more speed and increase power. I have used pips from 6mm- 20mm depending on power and tune. Having a spare hammer of a different weight with different pip length is another cost effective option.
Lastly, heavier inertia weight add mass to the hammer making it more difficult for the spring to get it moving but the inertia weight does not assist the hammer in opening the valve, it merely limits bounce. While fitting a heavier inertia weight will reduce the power only a little, it aids efficiency so is a valuable tuning aid.
There is one more thing I do to the 1000x block to optimise it’s efficiency in sub12fpe, that is by partially plugging up both the plenum and valve chamber to reduce its volume. This my seem counter intuitive but I prefer a slightly higher reg pressure to give a sharp blast of air rather than a softer push from lower pressure. Smaller plenum capacity means the a high percentage of air is depleted each shot ensuring the reg is working more consistently.
Bb
Living in the uk I almost exclusively work on sub12fpe rapids/RAW although I do have knowledge of high and very high powered versions.
The most obvious methods of adjusting power are, hammer spring tension, reg pressure, transfer port size and barrel length. There are a few others, pip length on the hammer, hammer weight and inertia weight, weight.
The genius of the rapid/RAW design is its simplicity and ease of maintenance.
Having a selection of different length/ power springs is a cheap and easy install.
Setting reg pressure is not difficult but having a couple set to different pressures is not prohibitively expensive and makes things easier.
Longer barrels with bigger ports give more power, having a couple of different barrels is an easy swap OR have one barrel with an index thimble were you can swap transfer port size is another option. OR a selection of valves with the same front port diameter but different top ports, this is more crude option but does work.
Older RAW and Theobens had a screw in pip, (Newer hammers with integrated pip is a backward step IMO) shorter pips allow the hammer to travel further, attain more speed and increase power. I have used pips from 6mm- 20mm depending on power and tune. Having a spare hammer of a different weight with different pip length is another cost effective option.
Lastly, heavier inertia weight add mass to the hammer making it more difficult for the spring to get it moving but the inertia weight does not assist the hammer in opening the valve, it merely limits bounce. While fitting a heavier inertia weight will reduce the power only a little, it aids efficiency so is a valuable tuning aid.
There is one more thing I do to the 1000x block to optimise it’s efficiency in sub12fpe, that is by partially plugging up both the plenum and valve chamber to reduce its volume. This my seem counter intuitive but I prefer a slightly higher reg pressure to give a sharp blast of air rather than a softer push from lower pressure. Smaller plenum capacity means the a high percentage of air is depleted each shot ensuring the reg is working more consistently.
Bb
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Isn't it time to re-design the RAW on a clean sheet of paper and correct all the things we discuss here?
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Here is a modified reg that I use in my HM1000x, it’s more consistent and far easier to fine tune and the spring compresses more progressively than the belville washers,
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I have de
Agreed to each point as I too do the similar things except reducing the plenum volume. I rather increase the plenum volume and the reason is that I work on high power RAW guns exclusively.It sounds to me Mr Motörhead, that you and I tune rapids/raw in a very similar manner.
Living in the uk I almost exclusively work on sub12fpe rapids/RAW although I do have knowledge of high and very high powered versions.
The most obvious methods of adjusting power are, hammer spring tension, reg pressure, transfer port size and barrel length. There are a few others, pip length on the hammer, hammer weight and inertia weight, weight.
The genius of the rapid/RAW design is its simplicity and ease of maintenance.
Having a selection of different length/ power springs is a cheap and easy install.
Setting reg pressure is not difficult but having a couple set to different pressures is not prohibitively expensive and makes things easier.
Longer barrels with bigger ports give more power, having a couple of different barrels is an easy swap OR have one barrel with an index thimble were you can swap transfer port size is another option. OR a selection of valves with the same front port diameter but different top ports, this is more crude option but does work.
Older RAW and Theobens had a screw in pip, (Newer hammers with integrated pip is a backward step IMO) shorter pips allow the hammer to travel further, attain more speed and increase power. I have used pips from 6mm- 20mm depending on power and tune. Having a spare hammer of a different weight with different pip length is another cost effective option.
Lastly, heavier inertia weight add mass to the hammer making it more difficult for the spring to get it moving but the inertia weight does not assist the hammer in opening the valve, it merely limits bounce. While fitting a heavier inertia weight will reduce the power only a little, it aids efficiency so is a valuable tuning aid.
There is one more thing I do to the 1000x block to optimise it’s efficiency in sub12fpe, that is by partially plugging up both the plenum and valve chamber to reduce its volume. This my seem counter intuitive but I prefer a slightly higher reg pressure to give a sharp blast of air rather than a softer push from lower pressure. Smaller plenum capacity means the a high percentage of air is depleted each shot ensuring the reg is working more consistently.
Bb
At higher regulator pressure the shot cycle is very snappier and gun becomes very efficient.
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Sorry fella, I’m in the uk, getting parts shipped to the us can be a nightmare, I mainly make stuff just to satisfy my own curiosity and make a few parts for friends. I post photos so that other like minded people can copy and improve.
All the best Bb
All the best Bb
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Thanks, the stuff I make is just an evolution of other peoples ideas and yours is an evolution of mine, we all learn from each otherI have learned a lot from you Bucketboy.
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On the subject of TM/BM fixed probes, have made modifications there too for better sealing and efficiency 
Removing the factory WEDGE seal collar replacing it with a Poly 0-ring within a flush face that makes the seal now using an o-ring. To center probe within bore a measured depth & diameter contains an extension of probe seal. This diameter is at bore being a slip fit. It reduces the wasted space behind the transfer port to barrel face increasing efficiency. That along with a DONUT ring placed on top of valve body within the oversize transfer passage of receiver between valve & barrel. Combined the overall VOLUME of the transfer passage gets reduced w/o altering transfer passageways size. ( Just reduced volume ) * .20 cal shown
Removing the factory WEDGE seal collar replacing it with a Poly 0-ring within a flush face that makes the seal now using an o-ring. To center probe within bore a measured depth & diameter contains an extension of probe seal. This diameter is at bore being a slip fit. It reduces the wasted space behind the transfer port to barrel face increasing efficiency. That along with a DONUT ring placed on top of valve body within the oversize transfer passage of receiver between valve & barrel. Combined the overall VOLUME of the transfer passage gets reduced w/o altering transfer passageways size. ( Just reduced volume ) * .20 cal shown
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I do something very similar, it make swapping barrels and even calibres easy as there is no need to adjust it because I packed the back of the probe with belville washers to give a degree of spring but still allows for perfect sealOn the subject of TM/BM fixed probes, have make modifications there too for better sealing and efficiency
Removing the factory WEDGE seal collar replacing it with a Poly 0-ring within a flush face that makes the seal now using an o-ring. To center probe within bore a measured depth & diameter contains an extension of probe seal. This diameter is at bore being a slip fit. It reduces the wasted space behind the transfer port to barrel face increasing efficiency. That along with a DONUT ring placed on top of valve body within the oversize transfer passage of receiver between valve & barrel. Combined the overall VOLUME of the transfer passage gets reduced w/o altering transfer passageways size. ( Just reduced volume ) * .20 cal shown
View attachment 436808
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Tho it would appear it would ONLY work for single loading purposes ? ( as i see it is an HM )I do something very similar, it make swapping barrels and even calibres easy as there is no need to adjust it because I packed the back of the probe with belville washers to give a degree of spring but still allows for perfect seal
View attachment 436815
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Looks like this HM will only work as single shot?I do something very similar, it make swapping barrels and even calibres easy as there is no need to adjust it because I packed the back of the probe with belville washers to give a degree of spring but still allows for perfect seal
View attachment 436815
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Yes, it’s my target gun, my local air gun club don’t like multi shot rifles. I get a better feel for the pellets single loading.
Bb
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We're having QUITE the worldly conversation here gentlemen ..... Pakistan to England to USA
Very nice to see honestly
Very nice to see honestly
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Internet has really made us close. It couldn't be thought of 30 years ago. There is a lot to learn when we can access like minded people across the world.We're having QUITE the worldly conversation here gentlemen ..... Pakistan to England to USA
Very nice to see honestly
Bhaur
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