Originally Posted by
RotorIP
No I understand energy
No you don't and teach it
probably but your reply is exactly my point. Nobody teaches HP.secs
yes they do. Seriously I don't know of an instructor or ground school anywhere that taught something like that because it has no relevance to actually flying
really? . Maybe at the test pilot school for calculations but that's it, too many variables.
IT THE FUNDAMENTALS -
it's VERY easy the ENERGY is in Fuel, Ht, A/S, RRPM, you feed it one of those at the rate the helicopter requires it - don't run out of RRPM till the drop won't kill you.
Waiting 2 secs before reacting is a certification criteria. Look it up.
part 27 or 29? Happy to beleive you on that - thought it was 1 sec but dependant on phase of flight - sounds reasonable but I am sure the intervention at 2 seconds is not lever down without (simultaneous) aft cyclic (for high speed cruise 
)
"has no relevance to actually flying"
Pilots do need to understand the Fundamentals of Energy:
Where it is
What it's worth
How fast you need it
How you can access/exchange it
- it's not rocket science, shirley?
HP.Sec is just a vehicle for doing that - some people use the unit the BANANA - you
may have heard of those?
(Talking
BANANAS: You may say u need 4 Bananas to fly at 60kts, 8 to hover, 9 at 140kts. 100ft is 1 Banana, 30kts is worth 1Banana 60kts is worth 3 bananas, 120kts is worth 7 bananas.) I don't like bananas!
but the Hp.Sec is pretty simple and easy and gives a clear representative understanding of the principles - without getting out a calculator.