Statistical investigation on flight test results.

[Yo-Yo]

But using the thin brown line in your own figure in post #8 this shows a climb rate of 23.5 m/s at 1800 hp which agrees with my calculation Yo-Yo :)

 

Please use 1850 like in the data chart.... so you will have 24...

 

and as far as i remember your graph shows 23, yes.

[Pilum]

Well OK, I always assumed 1800 hp because the K4 Kennblatt said 1800 hp but if we assume 1850 hp then I agree 24 m/s sounds good!

[Friedrich-4B]

I thought that the German charts were based on a PS (Pferdestärke) power rating, rather than hp or bhp -

 

thus 1800 hp = 1824 PS: 1850 Hp = 1876 PS: 2000 hp = 2028 PS (all figures rounded up)

 

or

 

1800 PS = 1775 hp: 1850 PS = 1824 hp; 2000 PS = 1972 PS

 

Shouldn't any power conversions use PS rather than hp? The differences are small, but they do exist.

[gavagai]

Good catch. Yoyo's equation uses power in watts, so hopefully it is already accounted for.

[Pzkfw]

Good idea to find airframe response. Theoretically assuming you have all data points. But I have a few q. How are you solving for lift/drag ratio? Are you assuming this is the same across all 109 g-k variants? Because there were some significant improvements, for instance cowling bulges and non retractable tail gear on the g-6 (most produced variant) vs K which had these refinements. May also be a few wing changes with different aero bulges but I'm not sure on that. L/D ratio in these cases may be more different than you think even at 300kph? If not explain how you can account for ignoring this? Since this will not be random distribution like rad drag.

[Solty]

I thought that the German charts were based on a PS (Pferdestärke) power rating, rather than hp or bhp -

 

thus 1800 hp = 1824 PS: 1850 Hp = 1876 PS: 2000 hp = 2028 PS (all figures rounded up)

 

or

 

1800 PS = 1775 hp: 1850 PS = 1824 hp; 2000 PS = 1972 PS

 

Shouldn't any power conversions use PS rather than hp? The differences are small, but they do exist.

I think you are right. I've checked that too. All the official German docs seem to contain PS instead of hp. So the standard we have in DCS, which is DB605DB engine, with B4 fuel and MW50 could reach at takeoff 1800PS and that is 1775hp.

Edited June 1, 2015 by Solty

[Yo-Yo]

I thought that the German charts were based on a PS (Pferdestärke) power rating, rather than hp or bhp -

 

thus 1800 hp = 1824 PS: 1850 Hp = 1876 PS: 2000 hp = 2028 PS (all figures rounded up)

 

or

 

1800 PS = 1775 hp: 1850 PS = 1824 hp; 2000 PS = 1972 PS

 

Shouldn't any power conversions use PS rather than hp? The differences are small, but they do exist.

 

It's less than 1.5%... and will change the results less than deviation of different tests.