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I rarely change a subject line but this time I am because LML roots is not what this thread is about.
Bill,
There are various philosophies on backup oxygen but what Mountain High advised me was to eliminate all possible variables for the backup system. So I have a constant flow system with a big can and no electronic controller. The can is in the cabin, the meter is attached to the can, and I can see the meter from the pilot's seat. The can is attached to the rear pressure bulkhead behind the left passenger's head. If the airplane is flying, the main valve is on. The remote valve is in front of the side stick and the mask is in a pouch I can get at with one hand while still flying.
I did my capacity planning based on 3 people starting at fl250 and wanting to maximize glide (in case I'm over mountains....). (about 40 minutes to zero msl with a full-feathering prop if the engine is dead.)
Negatives on this arrangement are that it's a big can and it's very high pressure so I can't refill it myself.
Also, it won't help you extend your fresh air time at fl250 beyond 40 minutes if you happen to have a live engine and no pressurization.
Positives are not much to break.
Colyn
On Jan 12, 2013, at 1:17 PM, Bill Wade wrote:
I agree. I've never used an oxygen system before but would like to install an emergency system in the IV-P I'm building. For starters, if there was a rapid decompression at altitude how quickly can a system be activated? Mask or cannula- should they be worn around your neck and plugged in just in case? Flow adjustments- I don't know enough yet to even ask intelligent questions. Thanks- Bill Wade
-----Original Message----- From: Greenbacks, UnLtd.
Sent: Saturday, January 12, 2013 7:40 AM
To: lml@lancaironline.net
Subject: [LML] Re: LML roots
I for one, would like to see LML return to its roots because in my experience, it's been adrift for a while. In other words, discussion of building techniques and problem solving and best building practices generally as they apply to our Lancairs. As well as interspersed with discussion of
how to safely and responsibly fly what a lot of us put together in our basements over many years. How about the topic of approach to stalls and spin avoidance. Gee, we haven't heard much on this subject in quite a while. :-) How about portable oxygen solutions, is there a clear winner out there? I plan to test the upper end of the altitude envelope in my 360 this year so I need to know.
And as for pre purchase advise for a 235/320/360, do your homework and go get a ride or 2 or 3 or more. Is there anyone left out there who does not know that the 235 gross weight was increased to 1500 lbs over 14yrs ago?
Oh, and here's a suggestion that may send a few people running for the hills, opinions may be interesting but really ought to be backed up by fact.
Cheers,
Angier Ames
N4ZQ
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