Paul,
                When you get time.  How do you get 3.17 ratio out of tracy’s
    Redrive.   I have the gears on my bench and can get 2.17 with reverse
    prop turning,  the normal 2.85 with same prop direction, but the 3.17
    has me stumped.  What have I missed??  Neil.

    Normally the ring gear is held and power is taken out of the planet carrier.
    In that case the prop turns in the same direction as the engine.
    Counter clock wise looking from the front of the airplane.

    If that does not work you have the wrong planet set or a measuring error.

    There are three planet sets in the late Ford boxes. Front to back.
    The first is the OD planet set. The next has been historically known as the
    front planet set. And the last the rear planet set.

    The rear planet set looks like this.

    Paul Lamar

    Hi Paul,

    What are the power, RPM and torque ratings for the Ford planetary system?

    Best regards,

    Gordon Gao


    I don't know but the transmission has been used for everything Ford makes
    including the Power Stroke diesel pick up truck engine with 650 foot pounds
    of torque since around 1955. The thing about planetary gears is they are six
    times stronger than  spur gears for the same gear width.

    Here is a P&W gear box good for 30,000 HP.

    Paul Lamar


Something to take note of on the P&W gearbox. The gears are double herringbone. Then they don't need to worry about end loads. The Ford gearbox has significant end loading that MUST be planned for.
Bill Jepson

Bill Jepson

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