Found this:
As an aside: In the video it is mentioned that VNE of 155 KTS is to reduced 3 KTS per 1000 ft.
Therefore at 10,000 a VNE of 125 KTS would apply. A darn important thing.
I mention this because, and I kid you not, I have had to listen to pilots bitch, gripe, whine and complain about this on many helicopters. (especially on the 212 where some develop a nervous twitch at anything below 100 KTS IAS. (Fun to Watch). Strangely they sometime complain at the same time about how rough the aircraft is while they blithely exceed VNE as they seem unaware that the VNE placard is in Hd NOT Hp) providing they looked at it at all.
Just a reminder to some, a small group I am sure, that while you may think you are crawling over the landscape at such a speed that you will reach retirement age before your destination.
Let’s look at flight 1000 ft in a standard atmosphere. Temp 13c Vne would be 152 KTS
Using a lapse rate of 2 C/1000 ft 10000 ft Temp should be +- -5C VNE is 125 KTS
But lets look at our True Airspeed
Using the numbers above and your Handy Dandy all Doing, all Telling Computer. ( Old School )
Or looking at your “No thought required Glass Panel” ( New School )
You TAS at 1000 feet is 153 KTS VS the 152 KTS calculated VNE indicated on the gauge.
Your TAS at 10,000 is 144 KTS VS the snail like 125 KTS Calculated VNE on the gauge .
See you will make it home in time for Beer Call!
Everybody Happy Now?
In any case fly safe and avoid unplanned, inadvertent Airframe / Planet interface……the Planet always wins.