Pivotal altitude figure

troy

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What is the correct way to determine pivotal altitude, or does anybody have a GOOD rule of thumb?
 

Wiggums

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Square TAS and divide by 11.3.

There is a formula, however, you probably won't have to apply it because the pts states, "determine the approximate pivotal altitude."
 
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troy

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I think that he will ask me to figure it out. The last commercial that he did for a buddy of mine got that one. It shouldn't be too hard to do with a calculator.

Again, thanks!!
 

bertengineer

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Pivotal Altitude

Remember, pivitotal altitude is the altitude based on ground speed. If ground speed decreases, pivotal altitude will decrease and vice versa. You can use TAS in MPH or IAS. If you figure your Va to be 105 then take 105 (IAS) squared divided by 11.3. This will be the pivotal altitude, but if you have a tail wind of 20 knots, then your entry altitude, since you will be going downwind, will be higher. Figure out what the altitude will be for a speed of 125. THen the same thing for the lower altitude with a headwind, say 85 knots. THis will be the altitudes you will be hitting throughout the maneuver depending on wether you are in a headwind or a tailwind, or crosswind for that matter.
 

Vandal

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Just a side note...try not to go into your commercial single engine add-on checkride and have NO idea how to figure out pivotal altitude...He asked me what it was I said "800 feet". Needless to say he didn't like that very much. Good thing he was forgiving and took a bathroom break to allow me to figure it out.
 

Wiggums

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bert: If you figure it out using MPH you have to divide by 15. 11.3 only works for knots.
 

bertengineer

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Correct

Wiggums,
You are right about the MPH using 15 as a division number. I was just refering to the IAS in Knots which I might have left out. Sorry if I confused anyone. I am preparing for my CFI checkride, so I need to keep things like that in mind.

bertengineer
 

Wiggums

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No problem, just making sure you have all the info.

Good luck on your CFI ride.
 

Little Deuce

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?

OK. Would someone please tell me what pivotal altitude is?
 

troy

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The altitude for entering eights-on-pylons. You know, that manuever you (might have) done along time ago (considering what you fly) for your commercial................

Or maybe you were joking..........

Anyway..........
 

Andy Neill

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Troy,

I was with Little Deuce on this one. I had no idea what pivotal altitude was. I got my commercial helicopter in 1969, commercial airplane in 1976, and CFI-ASE in 1978.

I learned something this week.
 

troy

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Hopefully I didn't offend anyone. I didn't want to look like a smarta$$, nor did I want to not answer any questions.

We can all learn a little something here........:cool:
 
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