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Search: Posts Made By: Mullins
Forum: All About Video and Photo Gear 07-03-2018, 04:51 AM
Replies: 5
Views: 3,122
Posted By Mullins
Re: What depths are you guys taking the GoPros

The gopro 60m housing should be fine. I've taken one to 105m / 344ft without any leaks but I turned it on beforehand, no pushing buttons at depth. I was very impressed that it survived!
Forum: All About Guns 10-17-2017, 03:52 AM
Replies: 232
Views: 25,712
Posted By Mullins
Re: More about the inverted polispast rollers

Gives you some idea of the madness that ensues when some latex tries to turn a corner at speed. Of course this exaggerated since there's no shaft involved and it's out of the water, so travelling...
Forum: All About Guns 10-16-2017, 01:57 PM
Replies: 232
Views: 25,712
Posted By Mullins
Re: More about the inverted polispast rollers

Sorry mate I tried to post last time this was mentioned, I'll give it another go once I find the photos.
Forum: All About Guns 10-16-2017, 01:07 AM
Replies: 232
Views: 25,712
Posted By Mullins
Re: More about the inverted polispast rollers

In principle, three things come to mind. All have to do with the mass of the rubbers and what their inertia is doing with respect to the barrel / spear.

1. Centrifugal force is trying to send the...
Forum: General Freediving Area 06-22-2017, 05:47 PM
Replies: 10
Views: 3,755
Posted By Mullins
Re: nose clip recommendations

Ahh it's polyamide sorry, another website indicated it was aluminium. Should still be fine though. I guess something to note is that dives are initially quite repeatable, so it's not the end of the...
Forum: General Freediving Area 06-21-2017, 08:33 PM
Replies: 10
Views: 3,755
Posted By Mullins
Re: nose clip recommendations

I can only really vouch for the trygons, which is expensive but effective. Pays to swap the pads for a material with a bit more friction though, they're ok initially but become too slick with a bit...
Forum: General Freediving Area 06-21-2017, 02:54 AM
Replies: 10
Views: 3,755
Posted By Mullins
Re: nose clip recommendations

If it's for depth then an aluminum one is probably a lot better than plastic. You need a lot of clamping force. Trygons are good but I'm not sure they're being produced any more? This one is probably...
Forum: All About Guns 03-29-2017, 03:47 PM
Replies: 107
Views: 16,422
Posted By Mullins
Re: About roller guns..

Or a still shot. Hopefully the photographer won't mind me sharing here. The effect exists, I suppose the question is the magnitude. This is dry and without a spear so probably a lot faster than a...
Forum: All About Guns 03-29-2017, 03:18 PM
Replies: 107
Views: 16,422
Posted By Mullins
Re: About roller guns..

Yeah lower mass going around the rollers. So the effect would still be there, but tiny in comparison with the force of the rubbers or the inertia of the shaft.
Forum: All About Guns 03-29-2017, 01:49 PM
Replies: 107
Views: 16,422
Posted By Mullins
Re: About roller guns..

Bands on a roller gun will try to lift off and take the long route around the rollers. They have mass and you're trying to turn them 180 degrees at speed, so centrifugal force will push the trailing...
Forum: All About Guns 03-23-2017, 07:13 PM
Replies: 61
Views: 6,650
Posted By Mullins
Re: C4 mechanisim alternative?

I'd like to hear about muzzle solutions for those guns too. It's a pity that C4 can make such a beautifully engineered gun (the graphite looks near perfect to me) with a hopelessly dysfunctional...
Forum: All About Guns 02-23-2017, 08:18 PM
Replies: 17
Views: 4,527
Posted By Mullins
Re: Abellan Denton 120_2017 Test

Good grouping but surprising amount of drop over that distance
Forum: All About Guns 12-23-2016, 09:08 PM
Replies: 33
Views: 4,737
Posted By Mullins
Re: Sigal or Devoto shafts

Yeah it may be some characteristic other than hardness, but any fish over about 10kg simply destroyed the shafts, even when they didn't fight much. That's partly just the cost of using stainless but...
Forum: All About Guns 12-22-2016, 10:49 PM
Replies: 33
Views: 4,737
Posted By Mullins
Re: Sigal or Devoto shafts

Sigal shoot well but are unbelievably soft. About one decent fish per shaft for me, so it's too expensive to keep using them. If only somebody made spring steel shafts in that shape.
Forum: General Freediving Area 12-02-2016, 05:57 AM
Replies: 70
Views: 48,452
Posted By Mullins
Re: How long can you hold your breath?

That's complete rubbish I'm afraid. Suggest you read up on freediving physiology?
Forum: General Freediving Area 12-02-2016, 05:27 AM
Replies: 70
Views: 48,452
Posted By Mullins
Re: How long can you hold your breath?

I know the brain cannot respire anaerobically. That's kind of the point. Your muscles can, and since you have a limited O2 reservoir you want to deprive your muscles of O2 as much as possible,...
Forum: General Freediving Area 12-02-2016, 05:16 AM
Replies: 70
Views: 48,452
Posted By Mullins
Re: How long can you hold your breath?

A deep freediver is very much like a 100m sprinter. It's a slow motion sprint. Muscles are working anaerobically. Lactate production, severe acidosis, to the point of failure. Actually more like a...
Forum: General Freediving Area 12-02-2016, 02:39 AM
Replies: 70
Views: 48,452
Posted By Mullins
Re: How long can you hold your breath?

It's pretty much the exact opposite of this (except for the oxygen conservation part). I could explain I guess but this really isn't a contentious thing in freediving. Essentially it's deeply...
Forum: All About Guns 10-16-2016, 03:07 AM
Replies: 45
Views: 5,973
Posted By Mullins
Re: Thoughts on Staggered band sizes

If you can keep a gun stable enough to push a shaft dead straight, you should be able to put practically any amount of power through it. I think the stock effectively gives way before the shaft does...
Forum: All About Guns 08-14-2016, 07:30 PM
Replies: 45
Views: 5,973
Posted By Mullins
Re: Thoughts on Staggered band sizes

You could smoothe out accel. with a cam / helical roller arrangement but it'd get pretty complicated
Forum: All About Guns 08-14-2016, 04:18 PM
Replies: 45
Views: 5,973
Posted By Mullins
Re: Thoughts on Staggered band sizes

Different lengths would all still give you peak force right at the start, diminishing from there. The greater the stretch coefficient the longer and smoother the accel, which I guess is why the...
Forum: All About Guns 08-14-2016, 02:58 AM
Replies: 45
Views: 5,973
Posted By Mullins
Re: Thoughts on Staggered band sizes

What does "staggered" mean in this context?
Forum: General Spearfishing & Diving Discussion 07-23-2016, 04:23 PM
Replies: 3
Views: 1,001
Posted By Mullins
Re: getting my rob allen to float

Foam that's lighter than air?
Forum: General Spearfishing & Diving Discussion 07-01-2016, 04:59 AM
Replies: 20
Views: 2,713
Posted By Mullins
Re: 2016 World Championship Advice

Leave some grouper for us?
Forum: General Freediving Area 06-30-2016, 07:24 PM
Replies: 4
Views: 4,715
Posted By Mullins
Re: Apnea/Reflex training - no water?

You should get fairly similar results in static without facial immersion. Bit less of a dive response than you'd have in the water, but that doesn't matter for static nearly as much as it does in the...
Showing results 1 to 25 of 224

 
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