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Thread: Home built aircraft engines

  1. #1
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    Home built aircraft engines

    I came across a number of websites regarding home built aircraft. This include fixed winged aircrafts and helicopters. The engines used are comonly car subaru engine. What are specialty of this engine. Is it because the piston drive is punching to the side or is it more powerful than other engines? Does other engines with piston strokes upwards and downwards give a negative impact to the aircrafts when it fly? Any body kind enough to let me know please...?

  2. #2
    Moderator Dana's Avatar
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    Re: Home built aircraft engines

    The engine orientation (direction of piston strokes) doesn't really matter from a standpoint of vibration or power. The horizontally opposed flat-4 engine configuration lends itself to a relatively light, compact engine, important for aircraft application.

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    Registered User pwood66889's Avatar
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    Re: Home built aircraft engines

    Another consideration is visibility over the nose. Upside-down, inline motors were popular - see the Tiger Moth, et al.
    Percy in NM, USA

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    Re: Home built aircraft engines

    was said: "the piston drive is punching to the side"

    That is so sweet and innocent. ;-) Subarus are just nice engines. They use a very short, stiff crankshaft so that there is little flex in the moving parts and therefore low wear. Uses light valves and pistons. Compact "boxer" design. Stable control of water temperature. Will run reliably at high RPMs. In a car, they'll go to 300,000 or more with good maintenance. A good late-model junkyard Subaru 2.5 is about $1500-$2000 compared to a Rotax with similar HP at what, $20,000?
    -Kent
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  5. #5
    tyc
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    Re: Home built aircraft engines

    Quote Originally Posted by kent Ashton View Post
    ... Will run reliably at high RPMs. In a car, they'll go to 300,000 or more with good maintenance. A good late-model junkyard Subaru 2.5 is about $1500-$2000 compared to a Rotax with similar HP at what, $20,000?
    Thanks for the tip, it's appreciated.

    tyc

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