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QFE for Pressure Altimeter not correct


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There seems to be an offset on the QFE scale on the Pressure Altimeter.

 

It is not possible to set QFE as directed by the tower. Only values above 947 can be set, but normally it is much lower. With 947 set it is far below sea level.

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Does the Su-33 use a different type of altimeter then the Su-27? If so, it should be changed in the Su-33 documentation I suppose.

 

What do I have to set when the Admiral Kuznetsov sends me this?

altimeter.thumb.jpg.77fd4b81cd778289fbf87f9be8ffebed.jpg

PC Specs: Win10, i7-6850K@4.1GHz, 64GB 4-chan DDR4CL14@2448Mhz, ASUS X99-A II, ASUS GTX 1080 STRIX A8G-GAMING, Samsung 950 Pro, Samsung U32E850R/32@4k60Hz
Flight Sim Gear: VPC MongoosT-50CM2 Grip with WarBRD Base and 6cm extension, VPC MongoosT-50CM3 Throttle, VPC SharKa-50 Collective Grip with Rotor TCS Plus Base, BRD-F1 Rudders(Su-35), 3x8"LCD 1024x768 with TM-MFDs, Dashboard with 60 buttons and 8 axis MMJOY2, POV-HAT(no TrackIR)
Aircraft: F/A-18C, F-16C, F-14, F-5E, Mig-21bis, Mig-15bis, AH-64D, Mi-24P, Mi-8MTV2, Ka-50, Uh-1H, FC3, SpitfireLFMkIX, P-51D, I-16, Bf109K-4
Terrains: NTTR, Normandy, Persian Gulf, Syria
Tech: WWII Assets Pack, Supercarrier

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Does the Su-33 use a different type of altimeter then the Su-27?

 

Yes it does :)

 

If so, it should be changed in the Su-33 documentation I suppose.

 

Very much agree - other instruments are also different; ADI, VVI, mech systems, fuel gauge.

 

What do I have to set when the Admiral Kuznetsov sends me this?

 

The pressure altimeter in the Su-33 shows values in kPa, for which 101,325 corresponds to 760 mmHg.

 

You can use this for conversion: https://www.convertunits.com/from/mm%20Hg/to/kPa

 

So in your screenshot, the required QFE value(760.13) transmitted to you corresponds perfectly to the kPa value(101.34) the altimeter shows :) .

JJ

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Correction to the above(lol).

 

The Su-33 altimeter uses hectopascal as the unit - I should have picked up on the "гПа" caption.

 

Conversion mm Hg to hPa: https://www.convertunits.com/from/mm+Hg/to/hPa

 

So when your Su-27 altimeter shows 76 mm Hg, it corresponds to 101.34 hPa in the Su-33 altimeter.

 

I think I got it right this time :)

 

 

Hi Alfa, thanks for the replay and info. How does it work in real life, do pilots request QFE in Hg or hPa from the tower?

PC Specs: Win10, i7-6850K@4.1GHz, 64GB 4-chan DDR4CL14@2448Mhz, ASUS X99-A II, ASUS GTX 1080 STRIX A8G-GAMING, Samsung 950 Pro, Samsung U32E850R/32@4k60Hz
Flight Sim Gear: VPC MongoosT-50CM2 Grip with WarBRD Base and 6cm extension, VPC MongoosT-50CM3 Throttle, VPC SharKa-50 Collective Grip with Rotor TCS Plus Base, BRD-F1 Rudders(Su-35), 3x8"LCD 1024x768 with TM-MFDs, Dashboard with 60 buttons and 8 axis MMJOY2, POV-HAT(no TrackIR)
Aircraft: F/A-18C, F-16C, F-14, F-5E, Mig-21bis, Mig-15bis, AH-64D, Mi-24P, Mi-8MTV2, Ka-50, Uh-1H, FC3, SpitfireLFMkIX, P-51D, I-16, Bf109K-4
Terrains: NTTR, Normandy, Persian Gulf, Syria
Tech: WWII Assets Pack, Supercarrier

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Hi Alfa, thanks for the replay and info. How does it work in real life, do pilots request QFE in Hg or hPa from the tower?

 

I have no idea mate. I don't know what the deal is with the Su-33 altimeter.....I guess this is just another mystery concerning "the blue wonder" :D .

 

At first I thought it could have something to do with its naval application, but then the MiG-29K(9.31) had a pressure altimeter with QFE in mmHg(like most russian military aircraft) and so does the Ka-27, while the Yak-141 had the same altimeter as the Su-33.....so :hmm:

JJ

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  • 2 weeks later...

Gentlemen,

 

I found a nice site to calculate/convert the pressures and thought I would share. Have fun :thumbup:

 

Aviation Calculations & Conversions by Joachim K. Hochwarth

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