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Posted

Hi all

 

New to the Mi-8 and learning cold and dark and I wondered about the circuit breakers.

 

I've been working with the start up tutorial and I've also watched an independent video and in both cases they say to turn on all the circuit breakers except the ones for de-icing and I wondered why that was.

 

If it's not cold on the ground, might it not get cold up high? Is it simply a case of the sim not modelling low temperatures, so there's no need for the switches to be on?

 

If you forgot and left them on, would it come back to bite you somehow?

 

Also there's a whole other bank of circuit breakers which are for the weapons systems. If you're not armed then no need to activate that bank. But what if you were going on an armed mission. Would you activate that bank on start up?

 

Thanks pilots

Badger

Posted

From the MI-8 manual.

 

The vertical rate of climb near the ground is 9 m/sec with normal takeoff weight (anti-icing system switched off) and 7 m/sec with maximum takeoff weight without the external weapons stations fitted. Activation of the anti-icing system reduces rate of climb by 1m/sec.

 

The operational ceiling with normal takeoff weight without external station racks is 5000 m (anti-icing system off), 4900 (anti-icing system on). With maximum takeoff weight it is 3900 m (anti-icing system off) and 3600 m (anti-icing system on).

Activation of the PZU particle separator system reduces the rate of climb by 0.6 m/sec.

Fitting of exhaust gas suppression (EGS) devices reduces the operational ceiling by 150 – 200 m and the rate of climb by 0.5 – 1 m/sec.

 

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With anti-icing and particle separator system engaged, fuel consumption rates indicated in the tables below increase as follows:

– engine anti-icing: 3%

– main and tail rotor anti-icing: 2%

With the PZU particle separator system engaged, fuel consumption rates per hour provided in Табл. 9.4 increase by 3%.

 

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You keep anti-icing off to lower fuel consumption and increase climb rate.

 

As far as weapons go, personally, I set them up on the ground and then just use the master arm switch to safe them until combat.

Practice makes perfect.

Posted

Only in icing conditions.

 

I've never gotten an icing warning with the temperature above 0c. The copilot has a little thermometer on his cockpit window you can watch. Keep in mind that higher altitudes mean lower temperatures. Just because its 5c at your FARP doesn't mean its 5c at 10,000 feet while you're flying over a mountain pass.

 

You get an audio/visual alert when you start having icing. It gives you plenty of time to turn the system on.

 

De-icing will function automatically once the left engines de-icing switch is set to manual mode. The system does not function with all the switches in automatic. I think this is to prevent ice ingestion on the engines, and possible engines failures. Someone else who knows more should correct me and elaborate though.

Practice makes perfect.

Posted

De-icing will function automatically once the left engines de-icing switch is set to manual mode. The system does not function with all the switches in automatic. I think this is to prevent ice ingestion on the engines, and possible engines failures. Someone else who knows more should correct me and elaborate though.

 

The system works automatically for everything except for the left engine - which has to be turned on manually.

 

AlphaOneSix explained why:

http://forums.eagle.ru/showpost.php?p=1950752&postcount=16

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