Where would Vs fit in the list of V speeds

[aslan1982]

Im trying to figure out where it would be placed

I know Vs must be less than V2 (V2 > 1.2 vs)

And also it should be less than Vr

Should it be below Vmca, Vmu and V1??

If i were to do a list of V Speeds, this would be it

Vmca Vmcg Vmu V1 Vmbe Vr V2

Vr > Vmca(1.05)
Vr >= V1
Vr > Vmu(1.1)
V1 > VMBE
V1 > Vmcg
V2 > Vmca(1.1) Vs (1.2) Vr

Are there any particular rules for Vs

[JB007]

Defined Take Off Speeds, in order, as follows: I added some notes to the speeds that are not in your original post.

--- BRP --- (Brake Release Point), followed by...
V s
V sr
The reference stall speed, a CAS selected by the manufacturer and is used as the basis for the calculation of other speeds.
V mc
The lowest CAS at which in the event of engine failure, it is possible to maintain control and straight flight with no more than 5 degrees of bank and without a greater heading change of 20 degrees.
V mcg
V ef
A CAS at which the manufacturer has assumed critical engine failure when determinining the value of V1.There is a 1 second difference from V ef to reaching V1, this is the pilots reaction time!
V1
V r
V mu
V lof then...
--- 35ft Screen Height, achieving V2 ---

V1 is never less than V ef
V1 can never be less than V mcg plus the speed to react and recognise the failure and must never exceed either V r or V mbe.

You may have to be more specific with your question relating to stalling speeds rules...far from being an expert!

Cheers
JB

[aslan1982]

ive done a bit more research

certified speeds are Vs Vmcg Vmca Vmu Vmbe and some more
(so these speeds were calculted during testing
at worst COG
trimmed for T/O
Max TOW
Max Power

Take off operating speeds are V1 Vr V2 and some others
are calculated using
TOW
Pressure altitude
Density altitude
Runway condition
Runway length

V2 > V2min, Vr, Vmu and Vr

Vr > v1, 1.05 Vmca , 1.05 Vmu

V2min > 1.2 Vs , 1.1 Vmca

Vmca <= 1.2vs

V1 <= Vmbe >Vmcg


So Vmcg/Vmca VS? V1 VS? Vmbe/Vmu VR V2min V2

still not sure where to put Vs?????:confused:

[JB007]

Added a few points to the above if that'll help! My list is the defined order, so Vs, been the slowest calculated speed, i.e Stall, will be first!

You may need to seek some more depth on what these speeds are, in theory and in practice, trying to achieve:

So Vmcg/Vmca VS? V1 VS? Vmbe/Vmu VR V2min V2

V s
I had it described to me by Sandy at ATA Coventry who was a Perf God as Minimum Steady Flight Speed if that helps, the minimum speed at which the aircraft is controllable. The stall speed is the greater of:


Min CAS obtained when the aircraft is stalled
A CAS equal to 94% of the 1-g stall speed (Vs1g)


V s1g
Is the minimum CAS at which an aircraft can develop a lifting force equal to its mass while at an angle of attack that won't create a stall!

Hope I haven't over done it for you!