if 2 bladed propellers more efficiant, why do chinooks have several?

Subject: if 2 bladed propellers more efficiant, why do chinooks have several?

Date: Wed Apr 28 06:01:24 1999
Posted by s.oliver/j.bullar
Grade level: teacher/prof School: london nautical school
City: london State/Province: No state entered. Country: england
Area of science: Engineering
ID: 925297284.Eg

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Re: if 2 bladed propellers more efficiant, why do chinooks have several?

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