Ivan Posted June 2, 2017 Author Share Posted June 2, 2017 Thanks, it is good to know that it is helpful As for the Oxygen, I have asked this question to BHPA, they say it is not mandatory for us to have the Oxygen on board and to use it up to 14000 feet. However (personaly) I can see the difference from 11500 feet already and will try to get it on board anyway when we fly high next time. Quote Link to comment Share on other sites More sharing options...
powerlord Posted June 4, 2017 Share Posted June 4, 2017 thanks - appreciated. frankly it's one of those things most pilots will only do once for the gimmick of it I imagine. I've had two flights up beyond 10k* - and though they were both fun, they were also very very cold, and I did feel a bit exposed up there - best will in the world - no GA pilots are gonna be looking for you up there (no jokes about GA pilots not looking whatever alti yer at...). It's good to know others are free to have a go if they want to. So now we know the law allows it, here's a few tips for those wanting to attempt it: - limit yourself to 10k first time - check you have class G up to that level +1k or so - use common sense - some class G is busier than others - chose somewhere quiet. - only do this in near zero wind - since at alti, it will be windier and it will make things tricker for land outs, etc. - fly with ground speed indicator (e.g. GPS) since at 10k you won't be able to tell if you are making progress/flying backwards in wind - fly upwind all the way to 10k - so your options are open for the decent - worst case engine out and you will still be ok to get back - if possible fly on radio with a friend, or even with a friend on ground - even 10k can effect some people with the lack of oxygen. comms might help them notice it's affects on you/ - wrap up massively warmly. at approx 3 degrees per 1000 feet, it's gonna be maybe 30 degrees colder than ground at 10k. wear face mask, gloves, multiple layers. - take a camera post on youtube, and then enjoy as 'americuns' start commenting that it's an illusion, and that the earth is flat *well a third, was just below 10k in Slovenia to try to clear Triglav, so I won't count that un. Quote Link to comment Share on other sites More sharing options...
MagMen Posted June 5, 2017 Share Posted June 5, 2017 Brilliant write up. I'm being very pedantic here but the standard atmospheric model is based on a temperature reduction of 1.98 degrees per thousand feet elevation (although this is usually shortened to 2 degrees per thousand feet). Quote Link to comment Share on other sites More sharing options...
powerlord Posted June 5, 2017 Share Posted June 5, 2017 fair enough, I was quoting the dry lapse rate (wrongly) https://en.wikipedia.org/wiki/Lapse_rate yours is much more likely of course and I should have quoted the ELR. my bad. brass monkey freezing one way or 'tother Quote Link to comment Share on other sites More sharing options...
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