A 70 mile-an-hour "Runabout."

A 70 mile-an-hour” Runabout.”

WHAT is claimed to be the most powerful petrol marine engine so far developed on, this side of the Atlantic for regular commercial use has just been tested successfully, by Mr. Hubert Scott-Paine, the well-known Managing-owner of the Power Boat Company.

Known as the “Power-SeaLion,” the unit is a remarkable adaption to practical commercial work of the well-known 500 h.p. ” Lion ” aero-engine, and is now to be produced on a quantity basis for fitting into marine motor-craft of many different types. Already it has been installed in a luxurious water ” runabout ” designed as a fast tender for a big yacht, and the launch so equipped, even with the engine only at half-throttle, attained a speed of more than 50 miles-anhour. So many modifications have had

to be effected, to make this aeroengine run like an ordinary standard marine engine, that its outward appearance has been almost completely transformed ; but the conversion has been accomplished with such technical success that for the great power it develops the engine has much smaller dimensions than any other known marine engine of anything like the power and is the lightest marine engine horse-power for horse-power in the world.