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Winter operations / lowest temperature for starting / preheating methods (merged)

Below what temperatures are people or organisations here using pre-heat? Here it is usually like this that in cold temperatures it is mostly IMC anyway, but out of interest.

LSZH, Switzerland

Here it is usually like this that in cold temperatures it is mostly IMC anyway, but out of interest.

I thought you were in the met business? It get coldest when there is no cloud cover and winter CAVOK is a fantastic time of the year for flying, especially since our typical airplanes have a lot more oomph. Usually we get an extended high pressure period in winter for a week or two.

The problem with electrical devices is that they need, er, electricity. That is often not available in Arctic regions, and not very easy on the apron of an airport.

In answer to the bit about the battery, in the conditions I am talking about, it is vital to remove the battery and keep it warm overnight. It simply won’t do anything if it has been cold soaked at -40°.

EGKB Biggin Hill

That’s another interesting angle. It would be very easy to keep the battery warm. The thermal resistance to ambient, in its box, is probably 1K/watt so 50 watts would do at -40C. One would put a 50W heater on the base of its box, although I would put a thick plate down there to prevent a hot spot, as well as a temperature switch.

Administrator
Shoreham EGKA, United Kingdom

It would be very easy to keep the battery warm.

I don’t know if they come in all sizes, but there are heated aircraft batteries on the market, e.g. from Concorde.

EDDS - Stuttgart

At LDZA you can call ground staff to provide the heating; they come with big truck providing heating tube directly to your engine and in 5 minutes you’re cranking the engine like in mid-summer – the downside it costs €25.

LDZA LDVA, Croatia

That’s another interesting angle. It would be very easy to keep the battery warm. The thermal resistance to ambient, in its box, is probably 1K/watt so 50 watts would do at -40C. One would put a 50W heater on the base of its box, although I would put a thick plate down there to prevent a hot spot, as well as a temperature switch.

The trouble is that you are either in a hangar or not.

If you are in a hangar, this is largely irrelevant. If you are not in a hangar, you still have the issue of where the power is coming from.

EGKB Biggin Hill

That’s a very good point, although you could heat up a battery pretty quickly, electrically. The battery itself could do it. It would too suffer in the low temps, but AIUI the low temp issue with lead-acid batteries in mainly the increase in internal resistance which prevents them starting an engine (say 200A). I am thinking of drawing 2A from it for say 10 mins.

If there are batteries with internal heaters on the market, I would think they must have thought about this. I reckon the heaters are intended for using the battery itself.

URL

Heated battery

Administrator
Shoreham EGKA, United Kingdom

Achim,

I am and that is why I know the situation here pretty well… We very often get a cold air lake here at ZRH and an inversion above it.

But I am no engineer. That is why I am asking.

LSZH, Switzerland

Sebastian, where did you source the heaters from?

The device is called “Wilms EL3”. I do not remember the dealer but I just searched on Google and there are a number of vendors. Sometimes there are also used ones on ebay. It is very well build and with 3kW the biggest you can run on a normal power outlet. If you use two of those you have to use two separate power outlets. Else the fuse of the power outlet will probably burn.

www.ing-golze.de
EDAZ
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