Which begs several questions, viz.:T. J. Ricer wrote:Not to beat a dead horse, but just in case anyone wants to "feel" the difference that Mark is talking about. . . try blowing (not buzzing) into a tuba that has the rotors set up 2 and 2. First press down valves one and/or two while you are blowing, then push down valves 3 and/or 4 while blowing. There is some sort of "flap-back" feeling when you press 3 or 4 while blowing as they turn "into/against" the airstream. (maybe try 1 and 2 together versus 3 alone, if you think the difference might be slide length).
do you feel a "flap-back" when you press 3 and/or 4 while blowing, then press down 1 and/or 2?
do you feel a "flap-back" when you blow into the open horn, then press down one or more valves?
if you reverse 1 and 2 to the direction of 3 and 4, do you feel a "flap-back" when you press down 1 and/or 2 while blowing into the open horn?
pgym "who can create a 'flap-back' on a rotor horn (or a piston horn, for that matter), regardless of the rotor setup, by depressing the rotors slowly enough, and therefore suspects that the 'flap-back' is due to the momentary interruption of the airstream as the rotor passes from fully open to fully closed to fully open, rather than the airstream changing direction"
