Higher drag & More load on the main wheels
Hi,Two issues that come to my mind.1. Raising the nose off the ground may actually increase the aerodynamic drag on the ground due to increase in angle of attack. this may result in slower acceleration to the lift off speeds and you may tend to eat up more runway.2. On large ac , lifting off the nose wheel early, when the wings are not really producing enough lift to take the weight off the main wheels, the aircraft weight shifts on the main wheels and may overly stress them ( i won't say they that they may collapse !!!).happy ldgs