Stability and Control characteristics of the Early Mark Spitfires

[CaptainDoggles]

Originally Posted by taildraggernut

is similar a good enough benchmark? even the Mk9 airframe was similar.

I think Winny's point is valid, would it be accepted if the aircraft being analysed was a 109?

IMO, the difference between a MkII and a MkV is much less than the difference between a 109F and a 109G.

My understanding is that a MkV is basically just a MkI but with a Merlin 45. True?

By contrast, the 109F is drastically different, structurally speaking, from the 109E. Different wings, different tail empennage, lack of wing guns, different engine cowling, etc.

If we were talking about, say, Fw 190A variants it might be a different story.

[taildraggernut]

My understanding is that a MkV is basically just a MkI but with a Merlin 45. True?

in very basic terms yes, but there were relatively significant differences, the bob weight, but even an engine change makes it a different beast, it performs differently it is loaded differently, the pilot's notes between the 2 reflect that, so I don't think it's a fair comparison at all.

[winny]

Originally Posted by CaptainDoggles

IMO, the difference between a MkII and a MkV is much less than the difference between a 109F and a 109G.

My understanding is that a MkV is basically just a MkI but with a Merlin 45. True?
.

It's essentially a MK I airframe, yes. There are differences though.
The airframes were strengthened (I must admit I don't know what this involved)
The radiator scoop under the wing is bigger, and there was a difference in weight .
MK V's had the inertia weight fitted into the elevator system as well. There's also a difference between early V's and late V's, they got heavier as more mods were added.

It's all a bit confusing, I've got Crumpp saying that the stall is horrid and yet I've got a NACA report on the Spitfire stall that says that it has the best stall characteristics of any fighter they had tested and that they were 'desirable'

The other problem I have with this whole argument is that there is no data for the same tests on any of the other a/c in the game (AFAIK). How many WW2 aircraft would have also been considered unstable by NACA?

[Al Schlageter]

winny it is all about making an Olympus Mons out of a mole hill.

[CaptainDoggles]

Originally Posted by Al Schlageter

Olympus Mons

[Crumpp]

It's all a bit confusing, I've got Crumpp saying that the stall is horrid

Read the NACA report.

Stall warning is NOT buffet effect on turn performance.

Accelerated stall is NOT a 1G wings level stall.

[Crumpp]

Spitfire Mk I Operating Notes, July 1940.

What do you think the "violent shudder" is.....hint....PRE-STALL BUFFET.

[Crumpp]

provided a basis for the adopted measurable standards for stability & control worldwide

Great!! A basis is not an adopted standard, Capeesh??

There were several British pioneers of stability and control. In fact, Gates is the one who came up with Aerodynamic Center and Stability Margin.

It made Center of Pressure theory obsolete and was integral part of Gilruths work. Like I said earlier, Gilruth and Gates were good friends.

That does nothing to change the fact the Air Ministry had no measurable standard in place until after the war.

Your link is a meaningless and has no bearing on stability and control standards.

[winny]

Originally Posted by Crumpp

Spitfire Mk I Operating Notes, July 1940.

What do you think the "violent shudder" is.....hint....PRE-STALL BUFFET.

Ok.. NACA report on stalling characteristics of the same MK V





Further on in the report

[taildraggernut]

Originally Posted by Crumpp

Spitfire Mk I Operating Notes, July 1940.

What do you think the "violent shudder" is.....hint....PRE-STALL BUFFET.

Precisely....and with an aircraft that is easy to control because it is light in pitch it is much easier for the pilot to control it to the edge of buffet, a Spit pilot only needs to use two fingers to unload the wings at the buffet, easy peasy.