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That's a very different thing though. I've walked up to 16k and it's damn hard, the last 2-3k. I don't recall anyone saying a mask doesn't need a much higher o2 flow rate. I've had very comprehesive blood tests done (for a different reason) and don't have that problem. Neither is a smoker or...

This site also gives a flow rate per person at FL180 with an oximiser cannula, at about 0.7L/min per person (see the graphic).

The problem is that those statements are debunked every time a pilot flies on oxygen, with modern equipment... by an order of magnitude. Something is not adding up here... I did that peter2000.co.uk flight test myself, with another pilot, and we used very careful procedures, and we both got...

Specifically, what suprised me was that modified breathing was not used. With my previous systems (oximiser cannulas, or the Precise Oxygen mechanical demand regs) this would not have been possible, and very conscious breathing was necessary above FL160, very much so at FL180, and having to...

I don't understand what you are saying. Are you saying that the blood o2 meter is lying, if the altitude is high enough. I have got those results at FL200 for an hour or two.

Both myself and my son (16) maintain 95% at FL200, using the O2D2 and plain cannulas. That's using normal breathing. That result was suprising, but is real.

What I have is this: The FAA requires that all pilots flying their aircraft above 12,500 feet for 30 minutes or longer or at 14,000 feet or above during the entire flight must use supplemental oxygen. Passengers must have oxygen available (but don't need to use it) above 15,000ft...

I've been flying with oxygen for years, and have now settled on the excellent Mountain High kit shown at the end of that writeup. However a colleague prompted me to look at stuff like this, which costs about $2k. It uses zeolite to absorb the nitrogen, so you get about 90% oxygen instead of 21%...

This is not for light GA, and the cost is irrelevant :) This is the kind of thing but with a built-in battery if possible.

I had been warned against using CherryMax rivets anywhere where they might want to come out again. I didn't realise this is because the mandrel is hard. I thought (having drilled out many pop rivets) that one just needs to drill out the head and the rest of the rivet will more or less fall out...

I see two pages of different Cherry rivets in a catalogue I have here. None of them appear to have a collar, though some have an "anvil" which rests against the rivet face and is intended to prevent damage to the rivet head from a misaligned anvil on the tool. The main ones in use for sheet...

I hope someone can give me some simple answers to a few stupid questions to do with "aviation" rivets... There seem to be "pop" rivets, and Cherry rivets. Cherry seem to be mostly (wholly?) rivets which leave behind a piece of the mandrel sticking out, which needs to be cleaned off, but this...

The rivets were probably some of these.

This is the one I last used, which kept jamming. If someone can recommend one which works really well, I will buy it, from the USA if necessary. Amazon.com doesn't sell to the UK but I have contacts out there.