Actually the main problem with the submerged take off is figuring the correct
length for the snorkel for the air intake and exhaust.  As take off speed
increases the drag on the tubing causes the snorkel to lag behind the
aircraft.  As the plane moves forward the angle of the snorkel decreases from
90 degrees.  The more speed the greater the decrease in angle and the more
hose is needed to reach the surface or the snorkel is pulled under the water
and the take off is aborted.  The good part is we have finally figured the
correct number of empty Corrosion X cans to use as a snorkel float is exactly
equal to the number of cans used to protect the entire aircraft, Plus the
radio.  CX research

Blitz