The new M15 rudder blade is 48" high according to Ida Sailor. My rudder on M15 #172 is only 33" high and does not have the stock M rudder with tilt up system. Does the stock M15 use a rudder of 48"? Or, is my Monty's rudder too small at 34"? This is a huge difference. Does size equate to better performance? Norm