[Flightgear-devel] How to compute Takeoff speeds
Ok there is a lot of table of speed vs weight vs flaps position everywhere. I want to compute them and not use any table. And it obvious that tables are the result of some computation. Do you think I can use something like that ? Vr = sqr( W / (0.5 * rho(0) * CL0 * S) ) CL0 is CL-0, rho is at airways level. I think I should add "Delta_Lift_due_to_flaps" to CL0, is this correct ? If any guru can help me ;) Something else. I have well advanced with the fmc, you can see a few screenshots here : http://www.chez.com/tipunch/flightgear/index.html Regards, Harald. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] How to compute Takeoff speeds
You can only estimate it. Aeromatic uses an estimate like this for the CL of airliners: 0.2 + (4.4 * alpha) + (1.5 * flaps_norm) if you assume a rotation to 10 degrees for lift-off, then alpha is 0.1748 in radians, and the above formula becomes: 0.9678 + (1.5 * flaps_norm) In the case of the 737-300 model in FlightGear, flaps 1 gives a value of 0.125 for flaps_norm, so the result is: 0.9678 + 0.375 = 1.3428 It's in the ballpark anyway :) Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
