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  #11  
Old 11-22-2017, 07:06 PM
F1R F1R is offline
 
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Check with Col. J Nelson, retired.

https://www.youtube.com/watch?v=vIR5YxzWNBM&t=38s

You might have met him at Reno.
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  #12  
Old 11-22-2017, 08:58 PM
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rvmills rvmills is offline
 
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IIRC, I think Coach Nelson just had the tube to open air that year at Reno. Not sure tho. He's got a place at L00 AC, and Cougar can get in touch with him.

Jeff Lavelle does have a setup that may work for you. His regulator sits in his front seat in Sport 39. Might be a bit large for a 4, but it might work.

Will text you his contact info Axel.

Cheers,
Bob

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Originally Posted by F1R View Post
Check with Col. J Nelson, retired.

https://www.youtube.com/watch?v=vIR5YxzWNBM&t=38s

You might have met him at Reno.
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  #13  
Old 11-23-2017, 12:45 AM
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Snowflake Snowflake is offline
 
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Okay, thinking outside the box here... How about just running the finer O2 lines that you typically find in GA O2 systems up the Jet mask hose, and fitting a cannula into the jet mask somehow, so it fits into your nose when the mask is on?

Heck, someone could even 3D print a custom cannula to fit into the front of the jet mask...

That would allow you to use an O2-saving GA system, *and* look like a fighter jock...
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  #14  
Old 11-23-2017, 01:10 AM
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rvmills rvmills is offline
 
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It would probably work Rob...as long as it didn't get too squished...or tickle too much!

I know one reason Jeff and other racers go for the full-on mask system is to be able to to to 100% O2 and seal out smoke, should that get in the cockpit.

I'll see if I can get some pics of his race system...its nice!

Cheers,
Bob


Quote:
Originally Posted by Snowflake View Post
Okay, thinking outside the box here... How about just running the finer O2 lines that you typically find in GA O2 systems up the Jet mask hose, and fitting a cannula into the jet mask somehow, so it fits into your nose when the mask is on?

Heck, someone could even 3D print a custom cannula to fit into the front of the jet mask...

That would allow you to use an O2-saving GA system, *and* look like a fighter jock...
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Sport Class Air Racing "Race 49"
SARL "Race 49"
West Coast Ravens FFI RV Formation Squadron
APRS Track
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  #15  
Old 11-23-2017, 04:16 AM
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Saville Saville is offline
 
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Quote:
Originally Posted by Snowflake View Post
Okay, thinking outside the box here... How about just running the finer O2 lines that you typically find in GA O2 systems up the Jet mask hose, and fitting a cannula into the jet mask somehow, so it fits into your nose when the mask is on?

Heck, someone could even 3D print a custom cannula to fit into the front of the jet mask...

That would allow you to use an O2-saving GA system, *and* look like a fighter jock...
I suggested that, in this thread, a few posts before this one:

"What would be the available O2 at your nose if you ran a modern small flexible hose up through the large mask hose and then placed the cannula across the mask roughly under your nose?"


And then I posed questions about the idea such as:

"Would you get enough O2? The two outlets of the cannula are not necessarily positioned where they would be if you wore it as designed - maybe an inch away. But then you have the enclosure of the mask to trap unused O2.

But then you are also exhaling through the mask which blows both exhalent and unused O2 out the mask. You can remove the valves so that there's a clear path out."

And then I proposed a couple of ground and an air test.

"Take PO reading without mask

Put mask on, turn on O2, Take PO readings a (?) intervals.

If that's safe then I would take it up to (?) feet and run the same test."

Maybe there are better tests to be made.

This system would not keep smoke out unless the larger diameter tube was closed off, and you kept the check vales in place.
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  #16  
Old 12-06-2017, 01:55 PM
Reformed SeaSnake Reformed SeaSnake is offline
 
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Default Scott 28000

I used a Scott /AVOX 28000 diluter/demand regulator pulled from a 727 and yellow tagged. I think the aircraft maintenance company I bought it from is out of business, but they should still be fairly easy to find. The Glider guys use a seat mounted version, but I wanted the panel mount. I got a custom tank reegulator from Mountain High to produce the 55psi the diluter/demand regulator needs. They were great to work with.

If you have the helmet and mask, you've already got the expensive bits. The diluter/demand regulator was $400 and the Mountain High guys charged me the same price for my custom tank reg as the stock GA ones. $195 at the time, but that was a number of years ago. Also, I got the comm adapters from flighthelmets.com which was already mentioned.
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Last edited by Reformed SeaSnake : 12-06-2017 at 02:19 PM. Reason: Added pricing
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  #17  
Old 12-28-2017, 10:39 AM
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Ironflight Ironflight is offline
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Axel - a couple of ways you can go here, depending on what regulators you can find in good, operating condition.

Here's what Elliot uses: https://m.youtube.com/watch?feature=...&v=a-lceaOL2E8

Most Military regs are second stages that require a 50 psi input pressure. You can find first stages that mount directly to a CGA 540 bottle for about $100 (I have one from Meret). Teflon lines, steel braided hose (AN4) and fittings is plenty for the expected intermediate pressure.

For a second stage, if you want to go REALLY compact, a CRU79/P fits essentially on the end of your mask hose (you might need to find/buildan adapter if you don't want to hack up the end of your hose - check Flighthelmets.com), but it is wasteful (if endurance is important) since it is a pressure-demand reg with no way to switch it off. A Diluter Demand unit (Liek the Scott/AVOX 28000 panel mount) is more efficient, but a little problematic to find space for in a tandem RV panel, You can use it as a portable, but it will be rattling around on the floorboards.

I have both a CRU79 and a 28000 that I can use as the situation requires. You'll need to do some searching (or lathing) for necessary adapters to build the system. Fun to play with (I built SCUBA systems and dive shop air systems in my youth) but make sure to observe good clean oxygen protocols for safety reasons (don't blow up your shop....).

Paul
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Last edited by Ironflight : 12-28-2017 at 08:32 PM.
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