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Post by Dennis the menace on Feb 28, 2020 20:11:32 GMT -5
NOTAM:
In icing conditions, do not forget to flip on the prop deicer switch on the Douglas planes, otherwise you will fall out of the sky. Even if you have pito heat and wing/structural deicing on, you will fall out of the sky if ice is present. Thrust will diminish as ice builds up on the blades, airspeed will fall, and the aircraft will stall. It is most certain. I did notice, that when the blades are "icy", when you turn the switch on, the RPM needles will jiggle around just a bit, to simulate ice being flung off the blades. I saw this over Alaska on a NWA DC-7C and got it to repeat this by turning the switch off, and then back on again a few times.
Pay no attention to the "anti ice fluid" gauge above the prop deicer switch. Fluid was only applied on the ground to planes that had a failed electric prop heating system and it could not be repaired where the plane was at. This was done by the mechanics on the ground. The only thing in the cockpit was the electric deicer switch which had both a normal and extended phase on it. If you fly Piper's Viscounts you will know what I'm talking about. In the event that system failed, the copilot could manually turn the prop icing on and off from his side of the cockpit.
I commented out my anti ice fluid gauge in the panel config file. Anyway, ignore it. Just leave the prop heat switch on, and when the anti ice fluid gauge reads "0", everything will still function just fine.
Mike
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Post by Erik on Mar 1, 2020 16:21:56 GMT -5
I’ve always wondered why some manufacturers use the boots, and others use heated leading edges. Tom, from what I read, it appears boots are generally less expensive but have some disadvantages, of which the most obvious one is: they are for deicing (ice removal) only, not for anti-ice (ice prevention). Nowadays, boots are most commonly used on prop planes and 'hot wings' on jets. In the classic era, it may have been mostly a case of preference - but that is just my guess. Erik
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