Dougie, yet another absolutely on the point post re Albert in Snowland. I well remember turning up at Gardermoen at the back end of an SF Detachment, to be confronted with props encased in around 2 inches of solid, clear ice. Our Captain suggested that a start up would shed the burden, especially with the application of prop de ice, the Eng, thankfully, pointed out the potential for fuselage damage. As we had, as usual, two GEs, we attacked the offending corpulent coalescence with hammers. An hour later, and ice free, Albert fired up with no sign of detriment on the gauges. An engine running de ice was applied at the runway hold and our return to Blighty went without incident. Now, I know that two inches of ice on a prop seems a bit of a "line shoot", I only ask that you trust me, I was a GE !!!!!
Smudge