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Search: Posts Made By: aa777888
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Forum: Rotorheads
5th Jul 2020, 20:52
Replies: 111
Views: 15,840
Posted By aa777888

What crab said. Wait a second...holy crap, I...

What crab said.

Wait a second...holy crap, I agreed with crab! :}
Forum: Rotorheads
5th Jul 2020, 13:01
Replies: 111
Views: 15,840
Posted By aa777888

I don't have one. The books I have say transverse...

I don't have one. The books I have say transverse flow. Right or wrong, that's what they say. And when it's time to take my next written knowledge exam, I will parrot the FAA answer. Meanwhile you...
Forum: Rotorheads
5th Jul 2020, 11:11
Replies: 111
Views: 15,840
Posted By aa777888

Now that's a sensible post. Obviously, like any...

Now that's a sensible post. Obviously, like any helicopter pilot landing a helicopter, I've done this innumerable times, but I can't say I've ever taken note of the actual MP, other than to keep it...
Forum: Rotorheads
4th Jul 2020, 17:57
Replies: 111
Views: 15,840
Posted By aa777888

Yes. Ref:...

Yes. Ref: https://etd.ohiolink.edu/!etd.send_file?accession=osu1149869712&disposition=attachment

This describes the effect in the Prouty figure in much more detail.
Forum: Rotorheads
4th Jul 2020, 13:02
Replies: 111
Views: 15,840
Posted By aa777888

Absolutely, positively not. But that figure does...

Absolutely, positively not. But that figure does not show rotor vortices. Not only is entirely clear from the drawings in the figure, the damn figure is labeled "Effect of Ground Vortex on Inflow...
Forum: Rotorheads
3rd Jul 2020, 17:16
Replies: 111
Views: 15,840
Posted By aa777888

The figure out of Prouty is not relevant to a...

The figure out of Prouty is not relevant to a descent. It describes the ground vortex that rolls up in front of a helicopter travelling in ground effect.
Forum: Rotorheads
2nd Jul 2020, 17:41
Replies: 111
Views: 15,840
Posted By aa777888

OK, stipulating that this has nothing to do with...

OK, stipulating that this has nothing to do with transverse flow, nevertheless per your own statement you don't get flapback until the vibration clears. That would mean that during the condition of...
Forum: Rotorheads
1st Jul 2020, 13:45
Replies: 111
Views: 15,840
Posted By aa777888

So you will throw the baby out with the...

So you will throw the baby out with the bathwater, then? I bet you can't name one book that doesn't have either a single error or something you don't agree with. So that's a ridiculous way to imply...
Forum: Rotorheads
1st Jul 2020, 01:43
Replies: 111
Views: 15,840
Posted By aa777888

Crab: according to the FAA Helicopter Flying...

Crab: according to the FAA Helicopter Flying Handbook, page 2-23:

This vibration happens at an airspeed just below ETL on takeoff and after passing through ETL during landing. The vibration ...
Forum: Rotorheads
30th Jun 2020, 11:46
Replies: 111
Views: 15,840
Posted By aa777888

Except that when you feel that vibration you are...

Except that when you feel that vibration you are already below ETL and what you are feeling is the vibration from the transverse flow effect. That's not a good technique, and certainly not when one...
Forum: Rotorheads
30th Jun 2020, 11:42
Replies: 111
Views: 15,840
Posted By aa777888

Such an interesting discussion! Other than an...

Such an interesting discussion! Other than an evil desire to perform airshow maneuvers, I've never wanted to perform a constant speed approach to a dramatic flare at the end, much less a 180 quick...
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