Where should I put the dater hole? How about a size? This is an 0.898" diameter baffle for a .22. The center hole is 17/64.
Dater hole size & location
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- whiterussian1974
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Re: Dater hole size & location
Position 1 allows the face to symetrically direct flow to mouth cut. Off side would create a cross jet cutting across cross jet, from right to left. Disrupting the throat's turbulant process. Though the high pressure would probably prevent this turbulant disruption.
Pos #2 avoids axial jet pushing into mousehole. This forces gas along outside of cone causing further cooling and stagnation. So I vote for #2.
As for hole, I have no #s for this. I would prefer 1/16", others may prefer smaller. The high pressure should prevent fouling, yet lower total chamber pressure be allowing additional "escape hatch."
The size of your red dot seems about the size I have seen on Commercial builds.
Hopefully someone will post a link to free Dr Philip Dater's papers.
I have searched exhaustively. But "no Joy."
Pos #2 avoids axial jet pushing into mousehole. This forces gas along outside of cone causing further cooling and stagnation. So I vote for #2.
As for hole, I have no #s for this. I would prefer 1/16", others may prefer smaller. The high pressure should prevent fouling, yet lower total chamber pressure be allowing additional "escape hatch."
The size of your red dot seems about the size I have seen on Commercial builds.
Hopefully someone will post a link to free Dr Philip Dater's papers.
I have searched exhaustively. But "no Joy."
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- L1A1Rocker
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Re: Dater hole size & location
This is going to be good info.
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Re: Dater hole size & location
Why do so many builds use straight lined cones instead of curved Frustum-cones?
The Bell shape creates suction behind baffle skirt pulling blast backward and outward retaining pressure surge longer.
The Bell shape creates suction behind baffle skirt pulling blast backward and outward retaining pressure surge longer.
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Re: Dater hole size & location
http://silencertalk.com/forum/viewtopic ... 10&t=72030L1A1Rocker wrote:This is going to be good info.
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
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Re: Dater hole size & location
Most "Dater" holes are 1/8" holes and only Gemtech uses a different location of the hole. They use #2 location from the OP diagram.
All other commercial cans use the location of the one from my picture that Doubloon posted.
All other commercial cans use the location of the one from my picture that Doubloon posted.
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Re: Dater hole size & location
Ease of manufacture. Most Form1 builders don't have the CNC's needed to produce the sloped cones under the plate.....not to mention the lower performance it yields.whiterussian1974 wrote:Why do so many builds use straight lined cones instead of curved Frustum-cones?
The Bell shape creates suction behind baffle skirt pulling blast backward and outward retaining pressure surge longer.
The straight cone performs better.
Re: Dater hole size & location
Didn't realize that was originally your picture I salvaged it from google cache and can spin it back into oblivion if you prefer.Bendersquint wrote:...
All other commercial cans use the location of the one from my picture that Doubloon posted.
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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Re: Dater hole size & location
I can't say I've ever seen a paper from Dr Dater on the hole ... in conversations quoted from others Dr. Dater only seems to indicate it is to help eliminate FRP ... Robert once referred to it as "hot rodding" the first baffle IIRCwhiterussian1974 wrote:...
Hopefully someone will post a link to free Dr Philip Dater's papers.
I have searched exhaustively. But "no Joy."
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
Complete Form 1s http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
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Re: Dater hole size & location
Nope its fine, I put it on the internet to begin with and someone doodled on it to explain to someone where the dater hole was.doubloon wrote:Didn't realize that was originally your picture I salvaged it from google cache and can spin it back into oblivion if you prefer.Bendersquint wrote:...
All other commercial cans use the location of the one from my picture that Doubloon posted.
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Re: Dater hole size & location
Yeah. Seems like a supercharger injecting gas around skirt before it enters from below through mousehole.doubloon wrote:I can't say I've ever seen a paper from Dr Dater on the hole ... in conversations quoted from others Dr. Dater only seems to indicate it is to help eliminate FRP ... Robert once referred to it as "hot rodding" the first baffle IIRCwhiterussian1974 wrote:...
Hopefully someone will post a link to free Dr Philip Dater's papers.
I have searched exhaustively. But "no Joy."
Bender, thanks for info. Why does it perform worse? I've only heard theory that it should help. I have no experience w it, but others support curves and I thought of trying it on a Future F1.
BTW, ANY papers from DR Dater would be greatly appreciated. He's often cited, but I've never found his reports.
I noticed that some builds use a swiss cheese type blast baffle, then no mousehole on 1st skirt. This would lower blastchamber static pressure and also act as turbulance inducing, occluded 1 way valve. Capturing the high pressure pocket until boreline pressure decreases enough to allow the cooled and expanded gas to reverse course. This is often used primarily on high power/volume rifle builds that use a version of cones whether: straight, stepped, clipped or K.
This would seem to be a K on METH!
Dumping all that energy into a pocket w nowhere to go.
Last edited by whiterussian1974 on Wed Mar 05, 2014 9:10 pm, edited 1 time in total.
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Re: Dater hole size & location
Well, not all of themBendersquint wrote:All other commercial cans use the location of the one from my picture that Doubloon posted.
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Re: Dater hole size & location
Which other commercial cans have dater holes in other locations?57fairlane wrote:Well, not all of themBendersquint wrote:All other commercial cans use the location of the one from my picture that Doubloon posted.
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Re: Dater hole size & location
element 2Bendersquint wrote:Which other commercial cans have dater holes in other locations?57fairlane wrote:Well, not all of themBendersquint wrote:All other commercial cans use the location of the one from my picture that Doubloon posted.
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Re: Dater hole size & location
Good call, forgot they changed that on the element2.
Only seen one of those come in for repair.
Only seen one of those come in for repair.
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Re: Dater hole size & location
Bender, what's your company contact info for repairs/recore?
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
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Re: Dater hole size & location
http://www.stalkingrhino.comwhiterussian1974 wrote:Bender, what's your company contact info for repairs/recore?
- whiterussian1974
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Re: Dater hole size & location
Thanks. I searched SRI NC, but got State University and Racing Supply info.chrismartin wrote:http://www.stalkingrhino.comwhiterussian1974 wrote:Bender, what's your company contact info for repairs/recore?
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
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The Death of One is a Tragedy, a million only a statistic.-Stalin
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Re: Dater hole size & location
There's a link in his profile.whiterussian1974 wrote:...Thanks. I searched SRI NC, but got State University and Racing Supply info.
http://www.youtube.com/watch?v=BDtd2jNIwAU MUSAFAR!
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
Complete Form 1s http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
http://www.youtube.com/watch?v=8CrOL-ydFMI This is Water DavidW
Complete Form 1s http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895