Turn rate charts

[WildBillKelsoe]

Do A-10A charts apply? If not, what is the source for DCS aircraft? Thanks.

 

I want to calculate required G for 18 degrees / sec turn rate carrying 2 mk-82's, tgp, alq-131 full cannon, and 50% fuel, at 3700 ft

 

Thanks

[Snoopy]

Yes A model charts apply. Even the latest C model -1 has A model charts.

[WildBillKelsoe]

thanks paulrkii.

[NoJoy]

Can be calculate with: G = 1 / cos ( Bank)

[effte]

No need for charts. Just calculate the radius at the required (true) airspeed and then the centripetal acceleration. Finally, good old Pythagoras to find nz (i e the G loading).

 

You didn't post an airspeed, which is a required parameter.

[effte]

Level turn, I applied SI units.

 

Turn rate ω=(deg/s)/180*π rad/s (1)

 

True air speed (in m/s) V=ω*r m/s => r=V/ω m(2)

 

Horizontal (centripetal) acceleration a=V^2/r m/s^2

 

Insert (2)

 

a=V^2/r=V^2*ω/V=Vω m/s^2

 

Insert (1)

 

a=V*(deg/s)/180*π m/s^2

 

g_centripetal=V*(deg/s)/180*π/g=V*(deg/s)/180*π/9.82

 

G load nz=sqrt(g_centripetal^2+1^2)=sqrt(a^2+g) =

sqrt((V*(deg/s)/180*π/9.82)^2+1)

 

G load nz= square root((V*(deg/s)/180*3.14/9.82)^2+1)

 

For zero turn rate

 

nz=sqrt(0^2+1)=1

 

Assume 90 m/s, around 170 KTAS and 18 deg/s.

 

nz=sqrt((90*18/180*3.14/9.82)^2+1)=3 g

 

The bank angle can be calculated from the centripetal acceleration from ba=atan(a/g)=atan(g_centripetal/1)

 

(Now play a good game of hunt the error - it's getting to 2200 here :) )

 

(And that is essentially the doghouse plot guidelines expressed algebraically)

Edited October 27, 2014 by effte

[WildBillKelsoe]

omg this turned into maths fiasco!!! ok, my speed at turning would be 285 KIAS

[effte]

omg this turned into maths fiasco!!!

 

You asked a question which is answered by physics/flight dynamics. You were given the tools to find the answer to your question, and you call it a fiasco?

 

Do we have a language barrier issue here regarding the word 'fiasco'?

Edited October 29, 2014 by effte

[xentxo]

4.8 g if TAS

5.0g if IAS

Mass of the airplane apparently plays no decisive role

Edited October 31, 2014 by xentxo

[WildBillKelsoe]

Relax effte I was joking.