Speed graphs for Spitfire and Hurricane

[camber]

Hi all,

My speeds are somewhat higher than others
For example, I get around 255-260mph SL offline for Spit Ia (3000rpm, +61/2psi)

EDIT: what am I talking about? Looking back the speeds are pretty similar for the last few posts. But will leave following points in:

A few things:

The cockpit gauge is not very precise, and tool tip gives speed in 10mph increments only (the no cockpit guage is a lot better). How are people recording +/-1 mph speeds online, is it estimating from needle position? I feel like estimating within 5mph is pushing it, and above 280mph the marks are in 20mph increments so to 10mph is pushing it.

The radiator position does give small increments in speed. I found that open to 1/2 open radiator gives 5-10mph extra (1/2 open to closed gives -250mph ). What radiator position are people using?

I also found that accelleration can be glacially slow for the final few mph. How long are people attempting to wave skim at their best 0fpm before recording a value?

Cheers, camber