did some of the airframes change due to the types of engines? i heard that if it was a griffon engine, the nose was longer and if it was a merlin it was shorter. is this true? also, thanks for the info on how it evolved. was wondering how the spits airframe changed.
The Spit Vb was basically the same airframe as the Spitfire I and II. The B Wing was also found on some versions of the I and II. The Spitfire Vc was a more strengthened airframe and had the redesigned universal wing. The Spitfire IX/XVI and first 50 of the XII were built on the Vc airframe. The VIII had a updated airframe with the retractable tail wheel. The last 50 Spit XII were built on that airframe. All XII had the pointed wider chord rudder as did all the XVIs. Many IXs did as well. The majority of the VII and VIII had this wider taller rudder too.
The Spitfire XIV was built on the VIII airframe with a redesigned tail to take on more of the torque.
In terms of diving, the thin wing of the Spitfire was the biggest factor. Testing was done at Farnborough with a Spitfire XI which had none of the guns or bumps for cannons etc. It reached the highest speed in a dive for a prop bird.
In terms of roll rate, the clipping of the Spitfire wing made a big improvement. This could be done to any of the Spit wings though as you could find clipped Vbs, Vc, IX, VIII, all XII and many XIVs in particular post war.
The Spit XVI used a Merlin rated for better performance down low so you wouldn't find it at 30K. The clipped wing was also meant to help down low, another reason it wouldn't be up high