APPENDIX C: DISCLOSURE OF NEWLY INVENTED CAPABILITIES FOR 
THE NONRESONANT ACOUSTIC PROJECTOR 
Naval Ocean Systems Center 
San Diego, California 92152 
2 June 1980 
MEMORANDUM 
From: H. A. Wilcox, Code 5304(B) 
To: Ervin F. Johnston, Code 291(T) 
Subj: Disclosure of Newly Invented Capabilities for the Non- 
Resonant Acoustic Projector (NRAP). 
Ref. (a): Patent Disclosure of 14 September °*$ 3 Titled "Non- 
Resonant Acoustic Projector with Adjustable Frequency, 
Adjustable Amplitude, Adjustable Depth, Drive Mechanism," 
1. On 20 April 1980 (while I was cn my recent vacation trip in 
the Middle East) I came up with a number of concepts for causing 
the NRAP (see ref. (a)) to perform in various novel and desirable 
ways. 
2. To start with, fig. Cl shows how the amplitude of piston oscil- 
lation can be readily "switched," in a time very short compared 
with the pistons! basic period of oscillation. and in a manner 
which imposes essentially no impulsive loads on any of the ma- 
cChinery cf the projector, from full-on to full-off and back again, 
or between a full-off and any desired intermediate value of piston 
oscillational amplitude, whenever the piston has reached a turning 
point (i.e., a zero-velocity point) in its cycle of operation. 
The turning point condition occurs twice fer cycle, when the center 
of axle 30 passes approximately through the point ?1 on fig. Cl, 
and again when the center of axle 30 passes approximately through 
the point 40. Throughout this description, it is to be 
understood that axles 20 and 120 are fixed in location relative to 
the projector housing; also, link 100 is understood to have the 
Same interaxle length as link 80. A solenoid-actuated clamp is 
located at point 93 so that it can clamp axle 90 to a fixed posi- 
tion relative to the housing at that location (it is to be under- 
stood that other means for clamping axle 90 in the position 93 
might be devised). When axle 90 is thus clamped, then as rotor 
10 turns about its axle 20 whose center 21 is fixed relative to 
the projector housing, tne center of axle 60 is forced to follow 
the arcuate line of action 61 between the turning points 62 and 65. 
This arc of action 61 is centered on point 93, so axle 90 remains 
fixed and therefore cross arm 110 does not oscillate about axle 120 
whose center is the point 121. Hence the piston linkages 150 and 
160 do not move, wherefore the pistons 153 and 200 remain quiescent 
with a zero amplitude of oscillation. While the center of axle 69 
is moving along the arc 61, axle 70 is censtrained by a suitable 
slot or other means so that its center moves along some such 
line of action as 71 between the turning point 73 (when the center 
of 60 is at 65) and the turning point 72 (when the center of 60 is 
eure 9 2)).5 
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