Speed graphs for Spitfire and Hurricane

[CaptainDoggles]

Originally Posted by ATAG_Snapper

Hi Klem,

Here's what I got yesterday for the Spit Ia at sea level:

6.5 lbs, 2800 rpms: 245 online, 249 offline
6.5 lbs, 3000 rpms: 252 online, 253 offline

Did you try offline at 3000 RPM? Comparing different RPM settings is rather counter-intuitive.

[ATAG_Snapper]

Originally Posted by CaptainDoggles

Did you try offline at 3000 RPM? Comparing different RPM settings is rather counter-intuitive.

I don't understand your question. Both online and offline are there, for two rpms. What's so "counterintuitive" about that?

[Kwiatek]

Originally Posted by klem

Kwiatek, did you make those tests off line or on line? Just curious because on line at 100 feet off Manston we couldn't get more than 248mph in Spit MkIa. Not that 8mph matters when its so far off.

Is there any way to check the atmosphere settings for on and off line? Is one or neither a 'standard day'?

Ups sry i made mistake Hurricane ( 238 mph) speed with Spitfire MK1 (255 mph).

I got 255 mph for Spitfire MK1a at sea level. Speed achived with acceleration in level flight not a dive.

All test i made was offline, single player mission, quick fly over channel.

[CaptainDoggles]

Originally Posted by ATAG_Snapper

I don't understand your question. Both online and offline are there, for two rpms. What's so "counterintuitive" about that?

WOW. I can't read. Sorry.

I don't even-

[klem]

Originally Posted by Kwiatek

Ups sry i made mistake Hurricane ( 238 mph) speed with Spitfire MK1 (255 mph).

I got 255 mph for Spitfire MK1a at sea level. Speed achived with acceleration in level flight not a dive.

All test i made was offline, single player mission, quick fly over channel.

255mph amost identical to ATAG_Sappers figure of 253mph for Spit Ia offline.

I think there's an atmosphere issue between on line and off line.

btw guys when you read off those ASI mph figures on the spitfire performance charts don't forget to deduct the PEC and Comp errors, e.g. SpitIa at 10,000 feet, ASI 286mph, Corrected (CAS) 275.4mph.

[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

[ATAG_Snapper]

Originally Posted by 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

I have my trim controls assigned to two levers on my CH Quadrant which gives me pretty precise control in levelling out at the proscribed setting. That said, it sometimes took a minute or three before I was satisfied that I was flying perfectly level at the exact altitude. By that time the speed is rock stable. I'm now virtually hands off so I can easily zoom in to the airspeed gauge to get a reasonably accurate reading despite the coarse scale. I agree the speeds will be +/- a few mph, but it's not too hard to make a fair estimation -- certainly within the precision of any concern.

All my readings were taken with radiator at 50%.

I'm running about 50 feet off the waves. I use my trim axis, not my joystick axis, to make the final delicate adjustments to maintaining perfectly level flight. I found it exacting and time consuming, but the airspeed held rock steady so I felt confident in the reading I was taking -- within +/- 2 mph at the most.

Hopefully others will have data, including the LW a/c, in case others fall on the short side of the curve at various altitudes.

Other parameters, in time, will need to be looked at as well such as turn radii, dive speeds, climb rates, etc.

[klem]

Originally Posted by ATAG_Snapper

I have my trim controls assigned to two levers on my CH Quadrant which gives me pretty precise control in levelling out at the proscribed setting. That said, it sometimes took a minute or three before I was satisfied that I was flying perfectly level at the exact altitude. By that time the speed is rock stable. I'm now virtually hands off so I can easily zoom in to the airspeed gauge to get a reasonably accurate reading despite the coarse scale. I agree the speeds will be +/- a few mph, but it's not too hard to make a fair estimation -- certainly within the precision of any concern.

All my readings were taken with radiator at 50%.

I'm running about 50 feet off the waves. I use my trim axis, not my joystick axis, to make the final delicate adjustments to maintaining perfectly level flight. I found it exacting and time consuming, but the airspeed held rock steady so I felt confident in the reading I was taking -- within +/- 2 mph at the most.

Hopefully others will have data, including the LW a/c, in case others fall on the short side of the curve at various altitudes.

Other parameters, in time, will need to be looked at as well such as turn radii, dive speeds, climb rates, etc.

Have you found a magical way to trim in the roll axis?
Or do you: 1. trim the rudder to offset the roll (thereby introducing drag) or 2. just hold the stick over (well, that would introduce some drag from the ailerons too I suppose).

[335th_GRAthos]

Hey guys,

Just out of curiocity (and 'cause I am too thick to go through the 30 pages and understand):

Does the current Spit MK1a and Hurri MK1a performance (after the alpha patch) match the graphs that were posted on page 1 of this thread????


~S~

[Insuber]

Please, can someone summarize the results of the tests? I'm lost between RL, offline, online speeds of Hurricane, Spit I, Ia, IIa etc.