102 A BSTRACTS

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R. W. Gallington, M. K. Miller and W. D. Smith. The ram-wing surface effect vehicle: Comparison

of one-dimens ional theory with wind tunnel and free flight results. Hovering Craft and Hydrofoil,

11 (15), 10-19 (1972); 9 ref., 24 fig.

Factors to be considered in the design of a ram-wing SEV are outlined.

S. Gardner. The Enfield marine amphibious hovercraft. Hovering Craft and Hydrofoil, 11 (4),

18 19 (1972); 1 fig.

The E.M.1 and E.M.2 crafts are described. The vehicles can carry payloads of 3 5 to 8.5 tons

respectively.

B. O.

H a r d i n a n d

V. P. Drnevich. Shear modulus and damping: equations and curves. Proceed-

ings of the American Society of Civil Engineers; Journal of the Soil Mechanics and Foundation

Division, 98 (SMT), 667-692 (1972); 23 ref., 16 fig.

Equations and graphs that can be used in solving design problems concerning repeated

loading or vibration o f cohesive and frictional soils are presented.

B. O. H a r d i n a n d V. P. Drnevich. Shear modulus and damping in soils: measurement and

parameter effects. Proceedings ~f American Society of Civil Engineers , Journal of the Soil Mecha-

nics and Foundations Division. 98 (SM6), 603-624 (1972); 25 ref., 17 fig.

Tests conducted in this study revealed that the shear modulu s decreases with increasing strain

amplitude while the damping ratio increases rapidly. The effects of effective mean principal

stress; degree of saturation, void ratio and number of cycles of loading are discussed.

S. P. Hertz0g. The Hoverjet HJ 100. Hovering Craft and Hydrofoil, 11 (6), 22-23 (1972); 2 fig.

A single-seat sporting machine made in Canada is described. This vehicle has an integrated

integrated lift-propulsion system that eliminates the need for outside propellers and shrouded

fans. A fur ther advantage is quiet operation made possible by a specially-designed muffler.

R. D. Hunt. The VTI hovercraft development. Hovering Craft and Hydrofoil, 11 (15), 4-9 (1972);

2 ref., 8 fig.

A descr iption of the VTI hovercraft used as a passenger ferry is given. Design features include

a full peripheral skirt and water propellers.

A. Jaumotte, A. Kiedrzynski, P. Spehl and P. Waterkeyn. Cushion mechanics of a peripheral

jet ACV in hovering flight over water. Hovering Craft and Hydrofoil, 11 (2), 6 17; (1972) 7 ref .,

8 fig.

A new design for jet-curtains is introduced. Results of a theoretical analysis and full-scale

model tests are presented.

J. D. H. Lambert. Plant succession on tundra mudflows; preliminary observations. Arctic, 25

(2), 99-106 (1972); 7 ref. , 6 fig.

Mudflows occur after heavy rainfall on unstable slopes. Areas stripped of vegetation due to

these flows experience increased thaw penetration. Identification of susceptible areas and further

research concerning the cause of mudflows will aid off-road vehicle operators in plann ing move-

ment so that disturbance of thermal soil conditions will be minimized.

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A. Moore. Performance of hovercraft lift fans in modified radial diffusers. Hovering Craft and

Hydrofoil, 11 (3), 28 32 (1972); 9 fig.

The performance of lift fans was tested with varied plenum c hamber geometry.

H. G. Murchinson. An experimental air cushion vehicle for the primary transp ortatio n of raw

forest products. Hovering Craft and Hydrofoil, 11 (4), 23-26 (1972); 2 ref., 2 fig.

An air cushion raft to be used to transport logs across muskeg areas is described.

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N a t i o n a l R e s e a r c h C o u n c i l o f C a n a d a A s s o c i a t e C o m m i t te e o n A i r C u s h io n T e c h n o l o g y . Air

Cushion Technology in Canada, NR C Technical Report, Ottawa (1972); 115.

A survey of current research being carried out in Canada concerning air cushion vehicles.

Priorities for future research efforts are suggested.

M. Neal. High performance light hovercraft over the cost hump. Hovering Craft and Hydrofoil,

11 (7), 26 27 (1972); 2 fig.