a preferred embodiment of the invention is shown mounted in a fore and aft direction proximate the stern of a carrying or main vessel and with two parallel support frames connected to form a box with the support frames placed on the port and starboard sides , relative to the main vessel &# 39 ; s fore and aft line . the same numerals are used in the figures to show the same or similarly operating parts and particularly for the port and starboard support frames . “ pivoted ,” as used means arranged for pivoting or rotational movement about an axis . the terms support frame or support frame or scissors jack , as used herein , refer to the support frame 21 , shown in the preferred embodiment in the form of a parallelogram scissors jack . the invention is shown in fig1 , and in a preferred embodiment , generally by numeral 11 , in its storage carry position , viewed from the port side of the main or carrying vessel 9 . the invention , according to its disclosed inventive principles is shown mounted on a base platform 13 attached to the transom 15 of a main or carrying vessel 9 , at location 15 a , and proximate the water line 17 . the base 13 or base platform 13 , is shown as having an open end 19 , opposed to the open water , as indicated by arrow 20 . the disclosed invention as viewed from the port side of main vessel 9 , comprises a box frame , comprised of two scissors jack frames 21 , port and starboard , shown as 21 p and 21 s in for the forward aft arrangement of the invention , as shown in fig4 . the port and starboard jack frames are expanding / collapsing support scissors jack frames 21 , the port side jack frame shown in fig1 , for a preferred embodiment , with four legs connected as shown by pivoting or rotating connectors 21 a , 21 b , 21 c , and 21 d . rotating pivot joint 21 d is connected to the jack frame base 23 , which is mounted on the base platform or base 13 . any suitable arrangement may be used to fix the expanding / collapsing support scissors jack frame 21 onto a suitable base 13 as would be known to those skilled in the art and these arrangements do not form part of the disclosed invention or would alter the disclosed inventive principles . as would be understood by those skilled in the art , the disclosure with regard to the port jack frame applies to the starboard jack frame , as shown in a preferred embodiment in fig4 . attached to the support frame 21 at pivot joint 21 a is support platform 31 . an auxiliary vessel 37 is shown supported by the support platform 31 in its storage carrying position . the support frame 21 axis 29 , through the center 22 of the parallelogram support frame 21 , not shown in fig1 and represented by parallel arrow 29 ′ relatively displaced from the support frame for purpose of explanation , at an angle with the vertical center 27 . the support frame 21 axis 29 , represented in fig1 by arrow 29 ′, in the direction of the storage carry position is under the effect of weight 33 of the support platform producing a torque driving the support platform toward the storage carrying position in the direction of arrow 28 . fig1 a shows the support frame 21 in a support frame central position or center vertical position for a preferred embodiment , over center with regard to the vertical 27 and the axis 29 , 29 ′, of the support frame 21 . as would be understood by those skilled in the art , and as shown in fig1 a , the term “ over center ,” is used for a preferred embodiment to show a point in the rotational travel of the support frame 21 , about rotational axis 21 d , in the directions as shown by arrows 28 or 30 , toward the support carry or launch retrieve , position , where the weight of the platform 31 , with or without an auxiliary vessel 37 , through the pivoting joint 21 a , on support frame 21 , develops no torque in the direction of arrow 28 , toward the support carry position as shown in fig1 or in the direction of arrow 30 , towards its launch retrieve position as shown in fig3 . as would be known to those skilled in the art , the central or center vertical position is used to illustrate a position in the travel of the support frame 21 where the torque on the support frame changes direction . as would be known to those skilled in the art , the central or vertical center , position of the support frame 21 where the torque changes direction may be varied by the size and shape of the support frames , the location of the support platform relative to the support frame 21 and the placement of the auxiliary vessel on the support platform 31 . in fig1 a , the position of pivot joint 21 d is shown on the base support 23 with respect to the view toward the port side of the main vessel . as shown for the preferred embodiment in fig1 , there is a docking fixture 41 with interlocking parts 41 a and 41 b . as shown in a preferred embodiment , the docking fixture uses a stud 41 b aligned to fit into receptor 41 a . docking fixture 41 is intended to prevent the platform 31 from moving in the direction of bi - directional arrow 34 , past the intended storage carry position or towards the center and the launch positions , as shown in fig1 a and fig3 and 6 . another docking fixture 45 may cooperate with transom 15 of the carrying vessel 9 , to prevent the support frame 21 and platform . 31 from moving under the weight 33 of the support platform 31 and the auxiliary vessel 37 , in the rotational direction as shown by arrow 28 , past its intended alignment position in the support carry position as shown by the alignment of the axis 29 ′, of the support frame 21 . the locking or docking devices 41 and 45 serve as limits to the travel of the support frame 21 and as restraining or retention devices to hold the support frame 21 and the support platform in position . as would be known to those skilled in the art , other suitable devises as now or hereafter known , may be used to hold the storage platform 31 in its store carry or launch retrieve , positions . as would be apparent to one skilled in the art , the various means or devices for docking and to hold the platform 31 and support frame 21 , aligned with its intended support carry position , may be varied and any suitable means may be used , without departing from the disclosed principles of the invention . referring to fig2 , the support frame 21 is shown at a point in its physical displacement or translation to or from its support carry or launch retrieve , final position , as represented by directional arrows 28 and 30 . as may be seen from fig1 a , 2 , and 3 , the support platform 31 undergoes a translational movement as it is translated by a complex motion combining movement in a cartesian coordinate direction , shown in a preferred embodiment in a substantially horizontal and vertical direction or , for example , in a direction from the support carry position to the launch retrieve position , and rotational movement about an axis , of the support frame 21 , as the support frame 21 contracts in going from one position , and expands along the main axis to the other position , going through a support frame central or center vertical position as shown for a preferred embodiment . in its translational movement , the parallelogram support frame 21 , as shown in a preferred embodiment , expands along its cross axis 29 a and contracts along its main axis 29 , as the support frame is translated from its support carry position or launch retrieve positions , to where the support frame 21 may be a square or rectangle , as shown in fig2 , and then contracts along its cross axis 29 a , and expands along its main axis 29 , as the support frame 21 rotates to final launch retrieve or support carry positions , respectively . similarly , the support frame 21 would contract and then expand along its axis 29 , as the support frame 21 is displaced or passes through its central or center vertical position . the translational movement of the support frame 21 displaces the support frame by rotation about axis 21 d in base 23 and displaces the support frame 21 and the support platform 31 in its cartesian or linear directions , shown in the preferred embodiment , as approximate the horizontal with reference to the water line and the vertical with reference to arrow 27 , to extend the support platform 31 to the launch retrieve position or the support carry position . as would be apparent to one skilled in the art , the complex movement by rotation and in the cartesian coordinate system , describing the translational movement of the support frame , reduces the displacement of the support platform 31 , mounted on the support frame 21 , in the vertical direction and horizontal direction , as compared to a displacement limited rotation only about a rotational axis , for example , 21 d as shown in a preferred embodiment . the complex translational movement in the linear and rotational , directions raises and lowers the support platform 31 while displacing the support frame substantially in a direction along a cartesian coordinate , or linear direction to extend the support platform 31 to its support carry or launch retrieve , positions while rotating the support platform through its central position . referring to fig3 and fig3 a , the platform 31 and the support frame 21 are shown for a preferred embodiment , in the launch retrieve position with the auxiliary vessel 37 in the water opposed to the open water end 19 of base 13 , and the inclined end 24 of the support platform 31 . the support 21 frame and platform 31 , are held in this position and prevented from movement toward the water by frame stop 62 shown mounted on support leg 21 g on support frame 21 and in contact with an adjacent leg 21 f , as shown in fig3 a . as would be understood by those skilled in the art , the frame stop 62 is not limited to a stopping member extending from one leg of the support frame 21 to an adjoining member but may be used with any of the frame 21 support legs . additionally , other suitable means may be used to stop the travel of the support frame 21 , whenin its storage carry position , as shown for a preferred embodiment , in fig5 . as shown in fig5 , the translational movement of support frame 21 , is limited to the quadrant on the launch retrieve side of the vertical center 27 , as shown in fig1 a , and where the torque on the support frame 21 from the weight of the support platform 31 is in the direction of arrow 30 . in a preferred embodiment , suitable means like auxiliary support 92 cooperating with stop 94 on leg 21 g , may be used to hold the support frame in position . the support 92 as shown in a preferred embodiment , may be mounted for rotational movement , in or out of operation with support frame 21 , by pivot joint 98 in auxiliary support base 96 on base 13 . support frame 21 main axis 29 , is shown for purpose of explanation , parallel to but displaced from the center of the support frame 21 . any suitable means may be used to dock or restrain movement of , the support platform 31 and the support frame 21 , at the intended limit of travel from one of its positions to another or at any between location , including electrical or mechanical limit switches and mechanically operated or electrically operated stops , as would be now or in the future , known to those skilled in the art . fig4 , shows the support frame 21 and support platform 31 from the front looking aft and in the launch retrieve position . pivot joint 21 a is shown for explanation purpose , as it would appear in its position aft or behind pivot joint 21 c , as may be seen in fig2 , to show the connection of the support frame to the support platform 31 . as may be seen in a preferred embodiment , as shown in fig4 , the support box frame 48 is formed by the connector 51 , connecting the port support frame and starboard support frame , respectively identified by 21 p and 21 s to distinguish their respective locations on the base platform 13 . the box frame 48 , is connected by the support frames 21 s and 21 p , to the respective support frame bases 23 s and 23 p at base pivot joints 21 d . the support frame 31 is shown , in the position shown in fig2 , and in the launch retrieve position with end 24 , not shown behind the base 13 , shown in cross section , and opposed to the open water end 19 ( not shown ), of base 13 . the support frame 31 is shown in fig4 , mounted in outside the support support frames 21 p and 21 s , and as would be known to those skilled in the art , the support frame 31 may be mounted inside or outside the support box frame box , 48 , without departing from the disclosed inventive principles . numerals 55 and 57 show the attached location of the port and starboard support frames 21 p and 21 s , to the base 13 . fig5 shows a preferred embodiment of the invention with the support frame 21 and platform 31 in the support carry position . in fig5 , the support frame 21 is on the launch retrieve side of the vertical center , as shown in fig1 a , and the weight 33 of the platform 31 drives the platform and its auxiliary vessel 37 into the engagement device 41 . separately shown in fig5 is a support frame stop 58 mounted on a leg 21 h and which rotates with leg 21 h about support base pivot joint 21 d to engage with base mounted stop 60 to prevent movement of the platform 31 and the support 21 past the limit of its support carry position . other suitable stops may be used as would be known to those skilled in the art . the docking means 41 is shown in a preferred embodiment with a single cooperating stop 41 b to limit movement of the storage platform 31 toward the launch retrieve position in the direction of arrow 30 . as would be known to those skilled in the art , other suitable locking or docking devices may be used . fig6 shows in a preferred embodiment , the support 21 and platform 31 with leg 21 g of the support 21 extending beyond pivot joint 21 , and supporting the platform 31 outside the support frame 21 by means of extension 66 on support frame leg 21 g . as would be understood by those skilled in the art , the support platform 31 may be placed on a support leg within the support frame and between the support frame joints 21 d , 21 a , 21 b , 21 c , without departing from the disclosed inventive principles . fig6 shows the operation of the limit stop 62 , shown in a preferred embodiment mounted on frame support leg 21 g and in contact with frame support leg 21 f , preventing it movement toward support leg 21 g and translation of the support frame 21 and the support platform beyond the intended stop launch retrieve stop position . as would be understood by those skilled in the art , the stop 62 may be placed on any of the other support legs and any other suitable stop may be used as would be known to those skilled in the art . as would be understood by those skilled in the art , the disclosed inventive principles may be varied as is now or hereafter known , without departing from the disclosed invention principles .