2.23 How can I stop an aircraft from bouncing up and down at the nose?

From FlightSim

Q:

HOW CAN I STOP AN AIRCRAFT FROM BOUNCING UP/DOWN AT THE NOSE?

A:

Sounds like a bad flight model which will need many changes to make it fly like a 747 :-)

Fuselage Angle For FS95 it was only necessary to change the 'Fuselage Angle' parameter in ADE, but for FS98 it is necessary to go back to an FS95 version of the model and change the relative heights of each gear set then hit 'recalc' in ADE. Then convert to FS98 again.

Bouncing Usually caused by: a) incorrect fuel capacity (usually too high) b) incorrect Max Gross Takeoff Weight (usually too low) c) incorrect Zero Fuel Weight (related to the above or forgetting to add crew and non-fuel payload to published 'empty weight').

The best solution is always to use correct specs. Many designers try to increase fuel capacity to get extra range, while the main wing geometry is the real problem. Same applies to Max Weights: many designers use reduced max weights to gain speed or range, while the real problem is in the wing geometry or drag coefficients. Use the same numbers for wing and stabilizer dimensions that the original aircraft engineers used - FS prefers them too :-).

Can also be corrected by adjusting the gear locations and doing a 'recalc', or using the 'cure dancing' option during recalc on an FS95 model in ADE. Then convert to FS98. Or adjust the gear loadings in an FS98 model. More info on the ADE 'Tips' page.

Ian Donohoe