Hurricane Speed Test in game

[IvanK]

As per the Spit IIA Speed test here is my test on the Hurricane. Wt this time as per the full line on the spec.

METHOD
Each run commenced on altitude with stabilised Oil/Rad temps Oil Temp at 80deg C. Rad Full open (At present I cannot detect any Rad drag so radiator position is not relevant imo)
Each altitude was a specific FMB set up. Altitude maintained +-50ft throughout the test. QNH checked as 992mb on the specific map used.
Each run done 3 times and Vmax average plotted.
Seal level temp estimated 19 deg C based on HEIII OAT gauge on the same map on the ground. TAS calculation based on standard 2 deg C lapse rate from the surface. so at 16,000ft I was using an OAT of -13deg C
My test wt as per the spec wt as it can be achieved in FMB with the Hurricane

Power setting was Full throttle 3000RPM. Indicated Boost +5.2. Now its important to understand that displayed Boost is not I believe actually measured in the FM but represents an angular animation value. We all know that it should be indicating +6.25 in the Hurricane

Results plotted as accurately as I could.


I had to extrapolate the graph in the lower left corner !

[David198502]

Originally Posted by IvanK

As per the Spit IIA Speed test here is my test on the Hurricane. Wt this time as per the full line on the spec.

METHOD
Each run commenced on altitude with stabilised Oil/Rad temps Oil Temp at 80deg C. Rad Full open (At present I cannot detect any Rad drag so radiator position is not relevant imo)Each altitude was a specific FMB set up. Altitude maintained +-50ft throughout the test. QNH checked as 992mb on the specific map used.
Each run done 3 times and Vmax average plotted.
Seal level temp estimated 19 deg C based on HEIII OAT gauge on the same map on the ground. TAS calculation based on standard 2 deg C lapse rate from the surface. so at 16,000ft I was using an OAT of -13deg C
My test wt as per the spec wt as it can be achieved in FMB with the Hurricane

Power setting was Full throttle 3000RPM. Indicated Boost +5.2. Now its important to understand that displayed Boost is not I believe actually measured in the FM but represents an angular animation value. We all know that it should be indicating +6.25 in the Hurricane

Results plotted as accurately as I could.

thx IvanK for your testing!
and thank you for confirming my observation, that rad settings dont have any effect on speed.
i got flamed a year ago by stating this on this very forum(i tried it with the 109s though)

[camber]

Thanks IvanK,

I got very similar data at height from my previous test (although my FTH for Hurri and Spit were a little lower in climb, perhaps CloD does model ram air effect on intake.)

Patch+hotfix Rotol Hurri:

FTH 15500ft
2700 rpm +6.1psi
235mph@15500 ft = 305mph TAS

[Crumpp]

Try the dry adiabatic lapse rate of 3 degree C / 1000 feet....

[IvanK]

Crumpp you said "Try the dry adiabatic lapse rate of 3 degree C / 1000 feet.... "

Why ?

The International Standard Atmosphere (ISA) lapse rate is 1.98 deg C per 1000 feet !

Its going to give a TAS even lower than what the IAS to TAS conversion above gives.
e.g. Based on the assumption Surface Temp is 19C then using the DALR at 3C/1000ft gives an OAT at 16,000ft of -29C so the 231MPH IAS I got would result in TAS of 289MPH versus the 298MPH TAS value I got using the ISA lapse rate.

[bongodriver]

I think Crumpp just wanted to quote from his text book....


But while on the subject of ISA......I have been getting strange ideas in my head about the QNH the game seems to model of 992 and can't get the idea out of my head about the US 29.92 inches of mercury and wonder if someone porked the atmosphere model that way.......crazy I know.

[Bounder!]

Just wanted to post and say thanks for the all testing IvanK, always nice to see how the current simulated ac in CoD perform against real data.

[IvanK]

Thats some lateral thinking Bongodriver but worthy of a mention to the devs .... Done.

[DC338]

Yes the QNH is strange, given that during the battle the QNH didn't often go below 1005.

[Crumpp]

Why ?

The International Standard Atmosphere (ISA) lapse rate is 1.98 deg C per 1000 feet !

I miss read your FTH and thought it might line it up better.

Your raw test data FTH aligns with the data converted to standard. In otherwords, the game is showing the FTH to be 17,500 ft, without conversion right?

If that is the case, the atmospheric conditions in the game are standard.

What was your Vy in the test, too?