Home / Articles / Brain Teaser – An 8-inch model screw

Brain Teaser – An 8-inch model screw

An 8-inch model screw, tested in a water tunnel at a rotational speed of 22.5 revolutions per second and a velocity of flow of 12 feet per second, yields a measured thrust of 28.5 pounds, a torque of 3.45 pounds and an efficiency of 70 per cent.

If the model scale is 1:25, what should be the equivalent rotational speed, thrust and power of the prototype when the speed of the ship is 15 knots? What will be the approximate velocity of the prototype slipstream?

How to open a briefcase| Back – Next | A Manager’s dilemma

About Doug Fred E.I.

Check Also

Fewer Metro Areas Add Construction Jobs During Past Year as Group Urges President-Elect To Pair Workforce With Infrastructure Measures

Construction employment increased in 211 metro areas between November 2015 and November 2016, the lowest number of metro areas to add jobs in four years

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.