by Nav » Sun Feb 20, 2011 11:48 pm
Instead of permanently changing the .cfg (like removing lines) I'd suggest that, instead, you just put '//' in front of the line. So that line, for example, would read:-
//concrete=Opensky_sparks, 1
The two strokes have the effect of 'disabling' the entry. But, if it doesn't help, or the change has unhelpful side-effects, you can readily reinstate it just by removing them.
Offhand though, as Crossfire suggests, I think the most probable solution is that you're pulling back too hard or too early (that is, before the aeroplane has reached flying speed). If the model has pilots' notes, look up takeoff procedure/speed in them and make sure you have enough flaps down and knots in hand.