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Thread: Today's trick question (win a prize)

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    Senior Member Robert F. Dorr's Avatar
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    Today's trick question (win a prize)

    1. Why was the Piasecki/Vertol H-21 Workhorse helicopter built with a large round hole on either side of the rear fuselage, halfway between the main landing gear and the horizontal stabilizer? What is the purpose of the hole and what is its diameter?

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    Re: Today's trick question (win a prize)

    It wasn't intentional. A jarhead accidentally put a hole through it.

    The diameter of the opening is roughly the size of a knifehand.

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    Senior Member technomage1's Avatar
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    Re: Today's trick question (win a prize)

    They're personnel relief holes.

    Seriously, I'm guessing they're probably not holes but black patches of paint, though as to why I have no idea. They look to be about 2' in diameter or so.
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    Re: Today's trick question (win a prize)

    Easy access to the engine equipment. The hole does look about 2-2 1/2 ft in diameter.
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    Re: Today's trick question (win a prize)

    Trick question indeed. It wasn't built with the hole. The hole was already there and the aircraft was built around it.

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    Senior Member 71Fish's Avatar
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    Re: Today's trick question (win a prize)

    It looks like they are for weight savings to allow the rear rotors to lift faster than the front rotors to keep them from hitting.

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    Re: Today's trick question (win a prize)

    That's where the tow hitch attaches?
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    Re: Today's trick question (win a prize)

    Used to mount (2) turboshafts on either side. Diameter of holes: 25 inches.

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    Banned sandsjames's Avatar
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    Re: Today's trick question (win a prize)

    Quote Originally Posted by Measure Man View Post
    Trick question indeed. It wasn't built with the hole. The hole was already there and the aircraft was built around it.
    Nice. Great answer.

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    Re: Today's trick question (win a prize)

    My answer is probably wrong, but it was an air in-take engine so I say the holes were designed for airflow.
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