Bank Angle Question

[yankee22]

Hey.....

Just wondering if any of you ex flight instuctors recall the formula for figuring out your bank angle with respect to TAS. The qustion I have is:

What's your bank angle in a standard rate turn if your TAS is 200?? The answer is 27 degrees. But I have no ides how they got it?

I do recall a formula from my instruction days but that was a while ago. I"ve forgotten. I know it sound slike an easy question but it's pissing me off b/c I can't figure it out.

Anyone....Thanks

 

[Erlanger]

Divide TAS by 10 and add half the answer.

ex: 200 ktas/10 = 20 + 10 = 30 Degrees of Bank

or;

Take your indicated airspeed and drop the zero. Divide that number by two. Add the remaining number to the intial number and this is your degree of bank to maintain a standard rate turn.

ex: 200kts Drop the 0 20 divide by 2= 10 10 + 20= 30 degrees of bank

 

[EMB170Pilot]

100 kts

drop the last digit of 100 = 10 and divide by half and add 2 numbers together

100kts:

- 10
- 10 divide by 2 = 5
- 10 plus 5 = 15 degrees

never used it once in my aviation career so no big whoop

 

[yankee22]

Thanks guys!!

 

[Nancy Pryor]

Divide TAS by 10 and add half the answer.

ex: 120 ktas/10 = 12 + 6 = 18 Degrees of Bank

or;

Take your indicted airspeed and drop the zero. Divide that number by two. Add the remaining number to the intial number and this is your degree of bank to maintain a standard rate turn.

ex: 200kts Drop the 0 20 divide by 2= 10 10 + 20= 30 degrees of bank

I find it much easier to just multiply by 1.5 than remember to perform multiple steps, but that's just the way my brain works. Example: 200 x 1.5 = 30(0) degrees of bank (I mentally discard the last digit without any conscious thought). It's almost like I'm visualizing the solution rather than calculating it, that's the best I can describe it. When I have to remember several steps to calculate a solution my brain rebels and just visualizes the answer somehow.

 

[Nindiri]

Just roll the plane until the little wings line up on the turn coordinator, then read the bank angle directly off the attitude indicator. Much easier than formulas.

 

[joe_pilot]

Just roll the plane until the little wings line up on the turn coordinator, then read the bank angle directly off the attitude indicator. Much easier than formulas.

That's much, much too easy.

Actually, you have to make sure the T/C is properly calibrated before you can trust that it makes Std rate turns.

So why is this question in the 'Regionals' section?

 

[Guitar Guy]

If you really enjoy math and physics...

If you want to get into way too much detail about calculating the bank angle, here's what little I can recall from one of my college courses:

Bank angle = arctangent [(V * rate-of-turn)/g]

where V is true airspeed and g is gravity. Be sure to express rate-of-turn in radians per second and not degrees per second.

Working the formula for a 200-knot true airspeed and assuming a standard-rate turn, the bank angle would be 28.8 degrees.

Of course, the rule of thumb stated above is much easier and quicker to use.

 

[jeroom]

Ex: A/S 600kt remove the zero = 60.. ok. add halz of the answer = 30 + 60 = 90... ok

Now std turn at 600kt = 90 degres... mmmhh! good luck

 

[EMB170Pilot]

yeah true...but again who the F cares

 

[Guitar Guy]

Ex: A/S 600kt remove the zero = 60.. ok. add halz of the answer = 30 + 60 = 90... ok

Now std turn at 600kt = 90 degres... mmmhh! good luck

Actually, the rule of thumb doesn't work very well at that high of a TAS. It looks like the bank angle required for a 2-minute turn at 600 kts is about 59 degrees.

 

[Amish RakeFight]

Isn't standard rate limited to 25 degrees on A/P and in some operations?

 

[threegreen]

Who gives a crap. just twist the autopilot knob and the plane will turn.

 

[flyin backwards]

Ok, now I have a headache. Standard rate is when you roll into a turn and the planes yells BANK ANGLE, then just take a couple degrees out.

 

[Guitar Guy]

Isn't standard rate limited to 25 degrees on A/P and in some operations?

A standard-rate turn is one that takes 2 minutes to complete a full 360-degree heading change or a turn with a heading change of 3 degrees per second, if you prefer.

There are bank angle limits on autopilots and flight directors that may limit the bank angle to one that is less than that required for a standard-rate turn, especially as true airspeed increases. However, the definition of a standard-rate turn is unchanged.

 

[Amish RakeFight]

A standard-rate turn is one that takes 2 minutes to complete a full 360-degree heading change or a turn with a heading change of 3 degrees per second, if you prefer.

There are bank angle limits on autopilots and flight directors that may limit the bank angle to one that is less than that required for a standard-rate turn, especially as true airspeed increases. However, the definition of a standard-rate turn is unchanged.

Thanks.

I know what the definition of a standard rate turn is.

My statement had more to do with what "standard rate" was for higher speed aircraft and AP operations and that it's limited to 25 degrees to prevent over banking.

 

[Guitar Guy]

Standard rate is still the same for larger or faster aircraft. However a bank angle limit may prevent an aircraft from achieving a standard-rate turn. For a given bank angle, as airspeed increases, the rate of turn decreases. Thus, a fast aircraft may not be able to achieve 3 degrees per second and therefore not be able to make a standard-rate turn.

 

[TCBKING]

When too much of the Blue is below me and Brown and green above me, I take out 5 degrees and open my eyes..uke:

 

[L.A.pilot]

http://williams.best.vwh.net/avform.htm#Turns