Search found 82 matches

by !Peter!
Mon Jun 18, 2018 10:38 am
Forum: Equipment & Technical
Topic: LabRadar Bluetooth app now available
Replies: 6
Views: 257

Re: LabRadar Bluetooth app now available

One little thing I noticed was that the Labradar gave no indication that the firmware had been updated other than new firmware numbers on the boot screen and the firmware files deleted from the SD card.
by !Peter!
Sat Jun 16, 2018 12:19 am
Forum: Equipment & Technical
Topic: What calibre?
Replies: 13
Views: 458

Re: What calibre?

John23 wrote:If you want a little more bang look at the 6bra
Same 6br die sets just the shoulder moved forward.

Do you mean 6BRX rather than 6BRA?
by !Peter!
Wed Jun 13, 2018 11:01 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Has anyone thought also about the negative pressure vacuum that is created which also causes mass turbulence as the projectile leaves the barrel? Or is this an unknown to you guys? After the muzzle blast there’s also a massive drawback into the muzzle. Don’t know if it will be relevant or if anyone...
by !Peter!
Sun Jun 10, 2018 11:59 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Peter sorry if my posts seem argumentative they are not intended to be. My written communication leaves lots of room for improvement. I have an electrical / electronic background and have dealt a lot with harmonics on the power grid. I understand the higher frequency has more energy for a given amp...
by !Peter!
Sun Jun 10, 2018 4:08 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

One more thing I should add, in the physics classroom they make an over simplification when they say the energy in a wave is proportional to it's amplitude. The energy in a wave is proportional to it's amplitude and frequency. So a higher frequency wave will have more energy than a lower frequency w...
by !Peter!
Sun Jun 10, 2018 1:13 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

.... It is why everybody is trying to design stocks that recoil directly back parallel to the aimed point. ... The barrel profile would be a consideration and why another reason why thick barrel profiles are preferred due to their resistance to bending forces. ... Depends what your goal and strateg...
by !Peter!
Sun Jun 10, 2018 1:00 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Peter I dont understand why you are so fixated with the standing wave. sungazer, I think you may have misinterpreted my last post. I included some things to think about if a standing wave is thought to occur. I completely agree with the rest of your post. I think a major cause of confusion in under...
by !Peter!
Sat Jun 09, 2018 2:46 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

This will be my last post pushing out information. I’m still eager to engage in discussion but I won’t be introducing new theory on the behaviour of a barrel, in all honesty, because there isn’t really any more that I know of. This subject matter has been researched in academia so there are academic...
by !Peter!
Sat Jun 09, 2018 2:17 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Thanks David, I'm familiar with inertia and moments of inertia but exactly what you were referring to as the "third point of inertia" had me stumped. If I understand correctly from your description you are referring to the inertia imparted on the bullet as it leaves the influence of the ba...
by !Peter!
Fri Jun 08, 2018 1:20 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

williada, In your posts you've often referred to the "third point of inertia". I'm not familiar with it neither have I been able to find a reference for it. Would you be able to direct me to a reference for it or explain it? Also I'd be interested in knowing about the work Rinker has done....
by !Peter!
Fri Jun 08, 2018 10:28 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Continuing on… The beam modes shown in my previous post are only in the one direction. In a real barrel there are many more types of modes. VarmintAl has produced an animation (see link below) of the first 8 modes with the action held rigid. Using the terms in my previous he has modeled it as Fixed-...
by !Peter!
Fri Jun 08, 2018 10:12 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Ok if we take just the speed of sound as the first component of causing waves at 19000 fps it takes 1.57*10-4 to travel the 3ft. The bullet takes 1ms. So in this 1ms time period the speed of sound can reflect a total of 3 times to the muzzle end and back (6.3 in total) Therefore we dont need to loo...
by !Peter!
Thu Jun 07, 2018 12:45 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

I would argue the point re the action being free to move. I would have said that the clamped free would fit the rifle better. The action is pretty well bedded and then pulled pretty tight into that bedding. Surly that is a clamped end? But can the action cause the stock to flex? Can the action move...
by !Peter!
Thu Jun 07, 2018 12:51 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

Calling all trombone players. Are trombone wave forms comparable to what happens in a rifle? Think of the slide as the bullet. In "position", the slide produces an harmonic, a note, out of "position" it produces a clanger. Regards, John Tracey. 6.6.18 In a rimfire rifle I think ...
by !Peter!
Wed Jun 06, 2018 11:07 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 2543

Re: Barrel Behaviour Theory

To continue on with some more theory... The material presented in the physics classroom is idealised and reasonably represents many waves found. However, as is always the case, the simple idealised equations don't reasonably represent all situations. In the case of a rifle system, the idealised wave...

Go to advanced search