Landing After Dark
JimB, Crab's little litany is what has been taught in the UK mil since the late 1980s and therefore predates Wiki(s) by some considerable margin. 
I just forgot the last bit of information helpfully supplied by Winnie to make it answer Chippy's question
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Are you guys sure?
In Sweden, with the super long dusks and dawns, night, for flight purposes, is defined as the point where you cannot properly make out a silhoutte from a certain distance. I don't remember the exact figures, but it makes sense to me. 30 minutes after sundown could be just as light as AT sundown, and it may never get dark enough to not make a flight under daylight conditions.
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In Sweden, with the super long dusks and dawns, night, for flight purposes, is defined as the point where you cannot properly make out a silhoutte from a certain distance. I don't remember the exact figures, but it makes sense to me. 30 minutes after sundown could be just as light as AT sundown, and it may never get dark enough to not make a flight under daylight conditions.
Personally I always found it most challenging to fly at dusk. Not enough light, and not dark enough for your eyes to adjust. Everything is just kinda flat. Hate it.
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Crab...
Civil twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon.
So this would be different for a chap, say on top of a hill then, or at say 1500 feet as the horizon would be further away?
Kevin.
Civil twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon.
So this would be different for a chap, say on top of a hill then, or at say 1500 feet as the horizon would be further away?
Kevin.
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c'mon lads and lassies the question was "after end of legal daylight". What happened to VFR starts at sunrise and finishes at sunset except during the summer months (not daylight saving time )when vfr starts 30 minutes before sunrise and ends 30 minutes after sunset, so privilege of license my backside. perhaps this is a good example of an instructor being a smartass and giving the wrong impression to a gullible student.
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Titus Frisbee
Or more likely a student misunderstanding what the instructor said.
perhaps this is a good example of an instructor being a smartass and giving the wrong impression to a gullible student
So this would be different for a chap, say on top of a hill then, or at say 1500 feet as the horizon would be further away?
TT
Island baby and mum in helicopter mercy flight to hospital
Well done to crew of S-92 and team inlvolved - now that's an aircraft suitably equipped to fly at night!
Island baby and mum in helicopter mercy flight to hospital - The Daily Record
Island baby and mum in helicopter mercy flight to hospital - The Daily Record
Island baby and mum in helicopter mercy flight to hospital
Dec 14 2009 By Lachlan Mackinnon
A FOUR-MONTH-OLD baby was airlifted to hospital yesterday from the Hebridean island of Rum.
The Stornoway Coastguard helicopter took off from the isle at 3.41am, carrying the little boy and his worried mum.
The drama began just after 1am when the alarm was raised.
Medics were told that the baby was having trouble breathing and needed an urgent airlift.
The crew of the Coastguard's Sikorsky S-92 helicopter was scrambled. They took off from Lewis for the flight south and touched down on Rum at 2.14am.
The copter flew the baby to Stornoway Airport, where the sick child was transferred to a waiting ambulance for the short drive to Western Isles Hospital.
A spokesman for the hospital described the youngster's condition as "satisfactory" last night.
Rum, known as the Forbidden Isle, sits a few miles off the coast of Skye. The island has a population of just 39.
In March, local people took legal control of part of the island, which is owned and operated by Scottish Natural Heritage, after the issue was put to a vote in January.
The school on Rum has only four pupils, with two more youngsters in nursery.
Dec 14 2009 By Lachlan Mackinnon
A FOUR-MONTH-OLD baby was airlifted to hospital yesterday from the Hebridean island of Rum.
The Stornoway Coastguard helicopter took off from the isle at 3.41am, carrying the little boy and his worried mum.
The drama began just after 1am when the alarm was raised.
Medics were told that the baby was having trouble breathing and needed an urgent airlift.
The crew of the Coastguard's Sikorsky S-92 helicopter was scrambled. They took off from Lewis for the flight south and touched down on Rum at 2.14am.
The copter flew the baby to Stornoway Airport, where the sick child was transferred to a waiting ambulance for the short drive to Western Isles Hospital.
A spokesman for the hospital described the youngster's condition as "satisfactory" last night.
Rum, known as the Forbidden Isle, sits a few miles off the coast of Skye. The island has a population of just 39.
In March, local people took legal control of part of the island, which is owned and operated by Scottish Natural Heritage, after the issue was put to a vote in January.
The school on Rum has only four pupils, with two more youngsters in nursery.
Local horizon also has nothing to do with it, the wording uses "apparent horizon" which is what counts. So IF the ground was flat where you are, when the center of the suns disk is 6 degrees below the "APPARENT" horizon etc.
AS a scandihooligan myself, born WELL above 66 deg 33 min north, I know about Midnight sun. So if the sun is NOT 6 degrees below the horizon, well then it is not night. It is that black and white. It can be dusk for 6 hours, but if the disk is less than 6 degrees below the horiz. well then it is not night...
Simple really. Jeppesen in the J-aid has a nice table for calculating sunset and sunrise from lat, gives UTC, and also local time to the minute by exact degree long.
Cheers
H.
AS a scandihooligan myself, born WELL above 66 deg 33 min north, I know about Midnight sun. So if the sun is NOT 6 degrees below the horizon, well then it is not night. It is that black and white. It can be dusk for 6 hours, but if the disk is less than 6 degrees below the horiz. well then it is not night...
Simple really. Jeppesen in the J-aid has a nice table for calculating sunset and sunrise from lat, gives UTC, and also local time to the minute by exact degree long.
Cheers
H.
Titus .... What happened to VFR starts at sunrise and finishes at sunset except during the summer months (not daylight saving time )when vfr starts 30 minutes before sunrise and ends 30 minutes after sunset,...... so you are saying there is no 30 min after sunset rule at this time of year ??
Anyway all this talk would be irrelevant with an FAA licence ( so long as the heli is cleared for night ) Dont start getting into NVG talk with the likes of Crab though , because only top gun mil types are capable of using them
Anyway all this talk would be irrelevant with an FAA licence ( so long as the heli is cleared for night ) Dont start getting into NVG talk with the likes of Crab though , because only top gun mil types are capable of using them
Nigelh, that's only because they had to wear them.
Who in their right mind would spend the majority of the Winter months with 2 cathode tubes strapped smack infront of your eyes banging photons off your retina.....
Makes me cringe to hear the willingness of some to bugger-up their eyes so willingly
Who in their right mind would spend the majority of the Winter months with 2 cathode tubes strapped smack infront of your eyes banging photons off your retina.....
Makes me cringe to hear the willingness of some to bugger-up their eyes so willingly
Avoid imitations
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Who did it willingly? We had to, and before you say "You shouldn't have joined then", they didn't have such things as NVG when I joined. Or AR5 aircrew respirators...
NVGs also seem to bu&&er up your neck, btw. Mine hurts every day.
NVGs also seem to bu&&er up your neck, btw. Mine hurts every day.
EESDL - if you are afraid of photons reaching your retinas, I suggest you keep your eyed firmly closed at all times
