1,156,049. Hydromechanical transmissions. INPOWER WORKS (PROPRIETARY) Ltd. 19 Oct., 1966 [1 Nov., 1965], No. 46669/66. Headings F2C and F2D. The reactive torque of a variable speed planet gear is provided by centrifugal force acting on a mass of liquid scooped from a centrifugally formed liquid ring 42 and trapped in a zone 45 in vanes 22.1 on a wheel 20 fast with a planet pinion 21 on a driving carrier 12, the liquid being rejected from the zone 45 at its radially innermost point relative to the carrier under the action of centrifugal force due to the rotation of carrier 12, and deflected by a plate 50.1 fast with the carrier, back into the zone 45 at a point radially outward of its rejection point relative to the carrier. As shown, the liquid ring 42 is formed in a drum 13 integral with the carrier 12 and the planets 21 mesh on output sun 16. In Figs. 7, 8 (not shown) the plate (50.4) is of semi-cylindrical shape and is filled by the liquid rejected from the zone (45) and spills over the lip of the plate, or is centrifugally forced through holes (60) below the lip, back into the zone (45). Again, Figs. 13, 14 (not shown), the liquid may be fed through the end walls of the semi-cylindrical plate into conduits integral with the carrier and communicating with the peripheral wall at the leading edge of the wheel, or, Figs. 15, 16 (not shown) communicating with the end walls of the vanes. In Figs. 9, 10 (not shown), the rejected liquid is collected at the trailing edge of the wheel and is fed via conduits (50.5) integral with the carrier back to the leading edge of the wheel, or, Figs. 11, 12 (not shown), back to the end walls of the vanes. In Figs. 3, 4 (not shown) straight radial vanes (22.2) are formed on a hub (51) freely mounted in the carrier (12) and surrounded by a shroud (52) fast with the carrier and formed with inlet and outlet holes in its end walls, the liquid being ejected axially from the zone through a conduit (50.2) adjacent the hub (51) and communicating with the zone through its end wall at a diametrically opposed point. Again, Figs. 5, 6 (not shown) the shroud covers only the leading half of the wheel and the conduit communicates with the zone through its peripheral wall for re-entry of the liquid. In Fig. 17 (not shown), the drum (13) is formed separate from the carrier (12) and is freely mounted on the input and output shafts.