Do you know your v-speeds?

EdFred

EdFred

Taxi to Parking
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White Chocolate
Not what the values for your plane are, but what they mean:

I was going through the AFM/POH and found a few I'd never seen, how many do you or don't you know.

VA
VAPP
VB
VC
VD
VFE
VH
VIMD
VIMR
VLE
VLO
VLOF
VMC
VMCA
VMCG
VMCL
VNE
VNO
VP
VR
VREF
VS0
VS1
VSSE
VX
VXSE
VY
VYSE

And no cheating! Top of your head only.
 
You forgot one...

It's published for every plane I've flown but often misrepresented with the wrong designator.

VBG
 
EdFred said:
Not what the values for your plane are, but what they mean:

I was going through the AFM/POH and found a few I'd never seen, how many do you or don't you know.

VA Manuevering
VAPP Approach
VB I think this corresponds to a point in the V-G diagram
VC Same as B
VD Design Dive speed, 10% above Vne IIRC
VFE Full Flaps extended
VH Same as B
VIMD no idea
VIMR no idea
VLE Landing gear extended
VLO landing gear operating
VLOF no clue
VMC minimum controllable airspeed in a twin (redline)
VMCA minimum controllable airspeed
VMCG minimum controllable airspeed in a twin, on the ground
VMCL some other minimum controllable airspeed
VNE never exceed
VNO max structural cruising
VP see B
VR rotate!
VREF reference approach speed
VS0 stall speed landing config
VS1 stall speed specified config
VSSE safe single engine speed for a twin
VX best angle of climb
VXSE best angle of climb single engine
VY best rate of climb
VYSE best rate of climb single engine (blue line)

And no cheating! Top of your head only.
Click to expand...

there you go
 
B, C, H, and P do not appear on the VG diagram.
D is dive, but it is based off of a different V speed than NE
 
Vne Is based off of Vd. Vne has to be set so that Vd is no more than 10% over Vne, IIRC
 
I think you've got to much time on your hands.
Go find some Fla. customers:D
 
tonycondon said:
Vmc minimum controllable airspeed in a twin (redline)
Vyse best rate of climb single engine (blue line)

there you go
Click to expand...

Fun quiz.

I don't recall seeing a blue line on the ASI of any single-engine plane. Are you sure about the red line answer?
 
Nope--I don't know all of them--nor do I care to know all of them. Few have any value to me.
 
TangoWhiskey said:
Fun quiz.

I don't recall seeing a blue line on the ASI of any single-engine plane. Are you sure about the red line answer?
Click to expand...

Yes. a twin has two redlines. one at Vmc and the other at Vne. Blue line is best rate of climb on one engine, Vyse. the way I answered Vyse wasn't the most clear. that is an airspeed for twins only.
 
tonycondon said:
Yes. a twin has two redlines. one at Vmc and the other at Vne. Blue line is best rate of climb on one engine, Vyse. the way I answered Vyse wasn't the most clear. that is an airspeed for twins only.
Click to expand...

Ah, yes! Cool. Thanks Tony. My lack of a Multi rating or experience shows here.
 
Since Tony got more than I did, I'd figure some research is in order

According to 14CFR1

V B means design speed for maximum gust intensity.
V C means design cruising speed.
V H means maximum speed in level flight with maximum continuous power.

How about this one?
V MU means minimum unstick speed.

What the heck is unstick speed?

And how about V PD?

Joe
 
Areeda said:
Since Tony got more than I did, I'd figure some research is in order

According to 14CFR1

V B means design speed for maximum gust intensity.
V C means design cruising speed.
V H means maximum speed in level flight with maximum continuous power.

How about this one?
V MU means minimum unstick speed.

What the heck is unstick speed?

And how about V PD?

Joe
Click to expand...

Yes, and Vd is Vh * 1.4

Glassy water takeoffs. Water is sticky when smooth.

PD....hmmmmm....doughnut speed?
 
Vspeeds, we don't need no stinking Vspeeds. Just point the nose down, the houses get bigger, point the nose up long enough and the houses get bigger still. Vats to know?


:rofl:
 
One more unofficial but critical one from the art/aviator side of aviation that everyone misses:

Flying Speed: An infinitely variable velocity dependent on every aspect of flight from attitude, pitch, roll, terrain, winds, gusts, runway conditions, obstructions, stall speed, redline, maneuvering speeds, acceleration, deceleration, phase of the moons around Saturn, etc, etc, etc, inclusive of everything up to and including the pilots intentions.
In short: As long as you have flying speed, you can make the plane do what you want it to do.
 
oh yea, i knew i recognized Vh from somewhere. thats the magic speed for LSAs.
 
V-PD is a Cirrus speed, max for parachute deployment

That aerospaceweb site is pretty cool, Thanks!

"[FONT=arial,helvetica]Next comes the minimum unstick speed, Vmu, which defines the point at which the aircraft could take off if the maximum possible rotation angle were reached. This maximum angle would occur if the tail of the plane were to actually scrape the ground."

Joe
[/FONT]
 
Areeda said:
"[FONT=arial,helvetica]Next comes the minimum unstick speed, Vmu, which defines the point at which the aircraft could take off if the maximum possible rotation angle were reached. This maximum angle would occur if the tail of the plane were to actually scrape the ground."
[/FONT]
Click to expand...

Hey Kent, what was Vmu in the 182? :D
 
I had to memorize the all important Vwwo speed. :P
 
Areeda said:
That aerospaceweb site is pretty cool, Thanks!
Click to expand...

You bet! They have one of the best accounts (including the radio reports!) of the B-25 Mitchell crash into the Empire State Building that I've ever read.

It's a fun site to peruse.
 
smigaldi said:
You forgot this one V speed, V$

This is the speed that money leaves your wallet and savings account in order to maintain your airplane.
Click to expand...

Do we measure than in AMU/hobbs hr or tach hr? :)
 
Teller1900 said:
I think it's in hrs spent looking at or thinking about a plane.
Click to expand...

So take the number of days since I got into this whole flying thing, and multiply by 30. That should give you a rough number of hours. :)

But it won't give you the AMU/hobbs hr that my plane costs me. I figured that out last night so far, and it made me sad. :(
 
Ted DuPuis said:
So take the number of days since I got into this whole flying thing, and multiply by 30. That should give you a rough number of hours. :)

But it won't give you the AMU/hobbs hr that my plane costs me. I figured that out last night so far, and it made me sad. :(
Click to expand...

you fool. I ONCE started to do some mental math on this, for my glider. I got maybe half way through it and realized I really needed to stop before I had a better idea of how much I really had spent per hour over the last 3 years.
 
tonycondon said:
you fool. I ONCE started to do some mental math on this, for my glider. I got maybe half way through it and realized I really needed to stop before I had a better idea of how much I really had spent per hour over the last 3 years.
Click to expand...

I am a fool, but I also must be an addict, as it hasn't deterred me from continuing. :)
 
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