Flyin'Dutch' wrote:- Flying using the QNH allows you to gross error check the function of your altimeter before you get going;
Why is that different from QFE then? I was taught to zero the altimeter, add 10mb and check display, then back to zero. Wind off 10mb, check display and then set to QFE / QNH as required.
Flyin'Dutch' wrote:- Flying using the QNH gives you relevant information in relation to obstacles, terrain and airspace around you
The thread is about QFE in the circuit. Don't think anyone is arguing against QNH outside the circuit!?
Flyin'Dutch' wrote:- Flying using the QNH prepares you to fly to/from airfields which are higher than the sub scale lets you wind off
Can you explain this please? ( Yes I know I'm ignoring the point of the thread - QFE in the circuit)
Flyin'Dutch' wrote:- Flying using the QNH prepares you for the day that you decide to continue your training and development and either go and fly on instruments in IMC or strip flying where the QNH is a lot more useful to have than a QFE from an airfield you are not going back to;
What's the reason QFE isn't used when on instrument approach? I would have expected an FD or AP to want to know when touchdown was imminent by knowing 0 feet = runway. (Again ignoring the point of the thread - QFE in the circuit)
Flyin'Dutch' wrote:- Flying using the QNH makes you more weather aware.
How does it help more than QFE in the circuit?
1. I know what sort of QNH to expect from the METARs of surrounding reporting stations so when I dial in the airfield elevation onto the altimeter I can check the QNH in the Koll's window
2. Go and fly from strips and airfields which are higher than say 1000ft and you cannot wind the Altimeter to show 0ft
3. For APs used to land in 0/0 conditions a radar altimeter is required. In instrument conditions you most definitely don't want to be stooging around on a QFE as it gives no relevant information in relation to obstacles and airspace.
4. Because when you use the QFE you have little idea of what the atmosphere is doing. E.G looking at that video, seeing the sun so low on the horizon and having a QNH of 1038 would make me aware that the fog is unlikely to lift.
Now ignore that this is at Blackpool where QNH is nearly the same as QFE and imagine you are flying to an airfield which has an elevation of 873ft.
If you want to work out what the atmospheric pressure is (and therefore want to know what the weather system is likely to do) you would have to do some mental arithmetic to work that out from a QFE.
Whilst you are doing the sums in your head I can already move on to the next item on the 'to do list'
@flyingeeza - I don't know what you are driving at, you asked what the benefits of QNH over QFE were, I thought I'd given some.
Not sure what the BPL video clarified either.