Sec. 25.527 - Hull and main float load factors.
(a) Water reaction load factors nW
must be computed in the following manner:
(1) For the step landing case
(2) For the bow and stern landing cases
(b) The following values are used:
(1) nW=water reaction
load factor (that is, the water reaction divided by seaplane weight).
seaplane operations factor equal to 0.012 (except that this factor may not
be less than that necessary to obtain the minimum value of step load
factor of 2.33).
stalling speed in knots with flaps extended in the appropriate landing
position and with no slipstream effect.
(4) β=angle of dead rise at the
longitudinal station at which the load factor is being determined in
accordance with figure 1 of appendix B.
(5) W= seaplane design landing
weight in pounds.
(6) K1=empirical hull
station weighing factor, in accordance with figure 2 of appendix B.
(7) rx=ratio of
distance, measured parallel to hull reference axis, from the center of
gravity of the seaplane to the hull longitudinal station at which the load
factor is being computed to the radius of gyration in pitch of the
seaplane, the hull reference axis being a straight line, in the plane of
symmetry, tangential to the keel at the main step.
(c) For a twin float seaplane, because
of the effect of flexibility of the attachment of the floats to the
seaplane, the factor K1 may be reduced at the bow and
stern to 0.8 of the value shown in figure 2 of appendix B. This reduction
applies only to the design of the carrythrough and seaplane structure.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-23, 35 FR 5673, Apr. 8, 1970]