This is for all the Lear drivers out there, and anyone else who can help. I'm doing a project on winglets for my aerodynamics class and I was wondering how tip tanks on the LJ 23/24/25/35 effect the aerodynamics. Do they act similar to winglets? I always assumed that they would create a lot more drag, but since Learjet hasn't changed the design they must help a little bit. Also, does anyone know why they can't/don't transfer fuel from the tip tanks to the fuselage tank during flight? Thanks!