Build a 1:12 Scale model unlimited hydroplane Slo-mo-shun IV Full size printed plans A build notes


Printed Plan and Article           

Not a Kit or Material

Vintage reproduce plan from 1952  

Slo-mo-shun IV

Full Size printed plans on two sheets 36” x 22” and 32” x 24”

Six page article with building notes and photos

SCALE 1/12 or 1” = 1’

LENGTH 28 1/8”

ENGINE .29 to .65


By Dick Ealy

Slo-Mo-Shun IV is presented here in scale model form. The scale is 1 in. equals 1 ft. The model planes like the real thing when powered by an Ohlsson & Rice .29 glow-plug marine engine. All drive accessories-universal, stuffing box shaft, strut, and shear pin-are also O&R prod­ucts. A 1 1/2"x 1 1/2" prop is used. If more power and higher speed are desired, the hull is strong enough and stable enough to permit using an engine with a displacement as high as .65 cu. in.

A NEW world's one-mile record for unlimited: s was set by Slo-Mo-Shun IV on June 26, 1950, at Seattle, Wash. Driven by its owner, Stanley Sayers, . this Allison-powered craft flashed across the water at a' incredible 160.323 mph. The previous record of 141.74 mph had been set way back in 1939 in England by Sir –Malcolm Campbell's Blue Bird 11.

 In hull .form, Slo-Mo-Shun - IV closely resembles the familiar three-step hydro­plane. It is different however in one important respect it has a small V -bottom section at the bow. At speed, a conven­tional three step hydro rides on just the two side sponsons and the extreme stern.

Limited quantity

Thank you for Looking Rose

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