F-15 Altimeter pressure display

[The_Tau]

What is the reason that F15C we have in DCS doesnt actually show what pressure altimeter is set? We can change the pressure but we dont know to what! 

[Mike_Romeo]

On 12/21/2022 at 10:36 PM, The_Tau said:

but we dont know to what!

You dont need the now the pressure for that. When you know at which altitude the airport is, just adjust the barometic altimeter until it shows the altitude for the airport you are standing on.

[The_Tau]

13 hours ago, Mike_Romeo said:

You dont need the now the pressure for that. When you know at which altitude the airport is, just adjust the barometic altimeter until it shows the altitude for the airport you are standing on.

What about when you are in the air? Or switching to standard pressure?

[Nahen]

Firstly, we do not set altimeter on the airport altitude. The altimeter must be set to "zero" before take-off. This is to facilitate the assessment of altitude, especially when landing.

If the altimeter has the option of entering the pressure value, it can be entered in flight, if we want to land at a different airport - then in flight we enter the pressure value appropriate for a given airport. In the case of returning to the airport from which we took off, zeroing altimetr before take off is enough.

 

In the F-15C FC3 module, the altimeter should be zeroed before take-off and not moved again

Edited December 27, 2022 by Nahen

[Aviator78]

10 minutes ago, Nahen said:

Firstly, we do not set altimeter on the airport altitude. The altimeter must be set to "zero" before take-off. This is to facilitate the assessment of altitude, especially when landing.

If the altimeter has the option of entering the pressure value, it can be entered in flight, if we want to land at a different airport - then in flight we enter the pressure value appropriate for a given airport. In the case of returning to the airport from which we took off, zeroing altimetr before take off is enough.

 

In the F-15C FC3 module, the altimeter should be zeroed before take-off and not moved again

 

Wrong for western procedures...

[Nahen]

44 minutes ago, Aviator78 said:

Wrong for western procedures...

Seriously?
Well, explain to me if in the F-15C module it is not possible to enter the value of atmospheric pressure, and at most the height in specific pressure conditions in a specific place, how do you want to use the ability to set the altitude on this instrument differently?
And in fact, when you have such opportunities, how do you want to use them differently if you take off, for example, at an airport by the sea and its height above sea level is 50 meters and you land 1000 km further at an airport that is 1500 meters above sea level? The two locations have different atmospheric pressures, how do you enter the flight altitude of the destination airport at the pressure difference between the take-off and landing locations? And what if you plan to land at airport X and during the flight it turns out that you are flying somewhere else, to a different runway height and completely different weather conditions?

If you cannot enter the pressure value and thus achieve the actual height of the "belt" in the given conditions (pressure) then what does it matter what you set on the altimeter? NONE. Therefore, in the F-15C module, there is no point in making any other moves than zeroing the altimeter at take-off. Fly from Anapa to Vaziani with dynamic weather and variable pressure. Let's see what you're set up to...

[Ironhand]

On 12/21/2022 at 4:36 PM, The_Tau said:

What is the reason that F15C we have in DCS doesnt actually show what pressure altimeter is set? We can change the pressure but we dont know to what! 

It most probably should, since there are situations where you have to input a specific pressure and that’s impossible to do without it. The few F-15C altimeter photos I’ve seen have the pressure window. Don’t know why DCS omits it unless it didn’t exist on the early models the DCS cockpit referenced.

[Cab]

2 hours ago, Nahen said:

Firstly, we do not set altimeter on the airport altitude. The altimeter must be set to "zero" before take-off. This is to facilitate the assessment of altitude, especially when landing.

Who is “we”?

[razo+r]

The vast majority of the world uses QNH or if that value is not available, sets the altimeter to the location's altitude above sea level. On top of that, ATC either assigns altitudes based on QNH or QNE, so everyone has the same basis. If you use QFE, everyone has a different "0" altitude, making coordination of airspace rather difficult. 

But if you cannot see the pressure setting on the gauge, it doesnt matter if you use QNH or QFE, you cannot set it to an accurate value if you flew to a different location.

[Nahen]

14 hours ago, Cab said:

Who is “we”?

We are a being, a self, there are millions of us...

 

A form that is used when conducting classes with a group of people. Something is being explained that is supposed to translate into the actions of these people. If you say "You have to do something", in a moment another person will ask you the same question because after all, "you told this particular person what to do, not the one standing next to them"

Don't confuse it with "general" - let everyone do what they want, "We" - "set" - was addressed to those who have a similar problem/question.

As Razo+r wrote - due to the inability to enter any pressure value in the F-15C module, in 90% of cases it does not matter what you do with the altimeter, whether you set the altitude to zero or to the airport altitude. You have a "true" radar altitude on the HUD and most of the time you use it anyway.
The problem arises when approaching the landing on the  instruments. But it is also a matter of whether you are aware whether the altimeter has been reset or the airport altitude has been entered.

I always zero before starting - just for fun.

[Cab]

Got it, thanks. 

[The_Tau]

2 hours ago, Nahen said:

You have a "true" radar altitude on the HUD and most of the time you use it anyway.

We have radar altimeter in HUD?

[Ironhand]

1 hour ago, The_Tau said:

We have radar altimeter in HUD?

No. It was there at one time but removed years ago--back in 2014 or so, I think.

[The_Tau]

22 minutes ago, Ironhand said:

No. It was there at one time but removed years ago--back in 2014 or so, I think.

so we have no radar altimeter at all in F15C and no pressure dial, nice...

[Ironhand]

43 minutes ago, The_Tau said:

so we have no radar altimeter at all in F15C and no pressure dial, nice...

In the real world, it would be a bit problematic...

[Nahen]

1 hour ago, Ironhand said:

No. It was there at one time but removed years ago--back in 2014 or so, I think.

You right. My mistake, looooong ago this has changed.

[norman99]

10 hours ago, The_Tau said:

so we have no radar altimeter at all in F15C and no pressure dial, nice...

Not really a big problem when 99% of the time there's no weather at all.

[AJaromir]

Every aircraft in the World have the pressure dial. To set propper QNH or QFE or the standart pressure (29.92). What will you do when you land on different airfield than which you took of from? How will you set the propper altimeter pressure setting when the airfield has different elevation? Since there is even no radar altimeter, it is very imporant to be able to set correct QNH or QFE. I consider this as the BUG because it is the bug - missing the reference pressure dial.

Edited November 26, 2023 by AJaromir