Sidemounted Inspiration

[dalegray]

Has anyone sidemounted an Inspiration?

I am planning on seting mine up to be used on a side mount system using an Explorer 1 Harness.

Has anyone done similar or know of anyone who has, any info would be of help

[wreckweasel]

Hmmm, this'll be fun! Where are you going to put the counterlungs then?

/Z

[Simon A]

Dale,
Duncan Price has built a side mount rebreather. You'll need to get some parts machined, but it shouldnt stretch your brain too much. However you may want to consider a Joker mouthpiece to get both hoses coming in from the same side.
See http://www.sump4.com/rebreather/d5_construction.html for a picture of Duncans 'Breather and the Joker mouthpiece.

HTH
Simon A

[dalegray]

Originally Posted by wreckweasel

Hmmm, this'll be fun! Where are you going to put the counterlungs then?

The plan is to keep the control layout the same as when I dive it back mounted in Open water, So I will probably mount the lungs on my harnes, and leave the same mout piece assembly, then lengthen the pipes between the T-pieces and the scrubber.

The only question with this is, that if I double the length of hose, do I need tohalf the cross section of the hose so it contains the same volume of gas?

Originally Posted by Simon A

Dale,
Duncan Price has built a side mount rebreather. You'll need to get some parts machined, but it shouldnt stretch your brain too much. However you may want to consider a Joker mouthpiece to get both hoses coming in from the same side.
See http://www.sump4.com/rebreather/d5_construction.html for a picture of Duncans 'Breather and the Joker mouthpiece.

Thank you for that, it does help to see how other people have done it.

[Decodiver]

Hi Dale,

Be aware that by lengthening the hoses you will be increasing the work of breathing on the unit.

Cheers

Dave Cooper

[turbanator]

Originally Posted by dalegray

The only question with this is, that if I double the length of hose, do I need tohalf the cross section of the hose so it contains the same volume of gas?

Yes, but as WOB is partly a function of the CSA of the hoses, would you not increse that by halving the diameter of the hose?

r
Paul (RB Noob)

Edit: Yeah, what Dave said

[apitkin]

The Hagen-Poiseuille equation for laminar flow of a gas shows that resistance is proportional to length and to the inverse square of the radius. So, if you double the hose length and halve its diameter, the resistance will go up by a factor of 8.

Within limits, the total volume of the loop is not critical, so you need to make sure your hoses are of an adequate diameter.

Jean Poiseuille 1797-1869 French physiologist; Gotthilf Hagen 1797-1884 German engineer.

[dalegray]

Originally Posted by apitkin

The Hagen-Poiseuille equation for laminar flow of a gas shows that resistance is proportional to length and to the inverse square of the radius. So, if you double the hose length and halve its diameter, the resistance will go up by a factor of 8.

Within limits, the total volume of the loop is not critical, so you need to make sure your hoses are of an adequate diameter.

Jean Poiseuille 1797-1869 French physiologist; Gotthilf Hagen 1797-1884 German engineer.

So what you are saying is that to double the hose length I should be doubling the cross sectional area of the hose?

[nigelH]

Originally Posted by dalegray

So what you are saying is that to double the hose length I should be doubling the cross sectional area of the hose?

Since the hose is trivial compared to the resistance of the mushroom valves I'd say use the same hose. The Inspiration hose is large compared to other systems that have met the CE WOB standards.

nigelH

[apitkin]

Originally Posted by nigelH

Since the hose is trivial compared to the resistance of the mushroom valves I'd say use the same hose. The Inspiration hose is large compared to other systems that have met the CE WOB standards.

nigelH

That's right. The resistance of the hose only contributes a small amount to the total WOB in a rebreather. The mushroom valves, scrubber etc are the main culprits.