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Thread: Extended Gear

  1. #1

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    Extended Gear

    Hello fellows.
    Could someone tell me the advantages and disadvantages of a extended gear on a PA-18? Is it mandatory for use with Tundra tires? Can we use tundra 31" without the extended gear?

    Regards

    AC Muller
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  2. #2
    behindpropellers's Avatar
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    Quote Originally Posted by carlbrun View Post
    Hello fellows.
    Could someone tell me the advantages and disadvantages of a extended gear on a PA-18? Is it mandatory for use with Tundra tires? Can we use tundra 31" without the extended gear?

    Regards

    AC Muller
    Advantage - Higher AOA when on the ground.

    Not required for 31" tires.

    Required for small tires and an 82" propeller.

    Tim
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  3. #3

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    A disadvantage of extended gear and/or tall tires is loading people/gear into and out of the plane. Fueling can also be a bit harder depending on the setup. Bit of thread drift, tall tailwheel/spring units also hurt AOA/prop clearance.

    DENNY
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  4. #4
    Steve Pierce's Avatar
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    3" gear helps the angle of attack, AOA helps take off run. The biggest thing to me is prop clearance. I operate on sand and gravel a lot and the prop takes a beating. When I bought my Super Cub I started out on standard gear and 700x6 tires, went to 29" Bushwheels, then 3" extended gear and then 31" Bushwheels. All helped.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  5. #5

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    Very enlightening

  6. #6

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    The item that drove extended gear in my memory was the use of Borer props with skis. Guys would switch from big tires to skis and not have FAA required prop clearance.

    Extended gear has a wider track as much as taller stance. Guys like that as well since big tires can be a little wobbly. Atlee Dodge made the first extended gear that I remember and while 3” extended served the purpose for prop clearance he didn’t like and advised against using 6” extended gear. On counter point Wayne Mackey’s SQ-12s have something like 10” extended gear. Wing mods drove that, no doubt.
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  7. #7

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    A bit of a weight penalty and defiantly some aerodynamic drag added.
    Hanging big tires further out and down affects AOA at cruise. I'm guessing 3-4 mph penalty, but curious what others think.
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  8. #8
    Steve Pierce's Avatar
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    1 1/4" 3" extended Atlee Dodge gear is 1.8 lbs each side heavier that stock Piper gear from the ones I have weighed. I consider them a must on my airplane for my mission.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  9. #9
    aktango58's Avatar
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    As you raise the front of the aircraft, bigger tires, longer gear, you also increase the force needed to lift the tail.

    When landing the extra tail weight is a good thing, taking off not so much.

    3" gear helped in most applications I used my cub in. It was really nice for skis, as the towers were not super tall, and as said before I could not meet prop clearance.
    I don't know where you've been me lad, but I see you won first Prize!
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  10. #10

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    At what point when moving the weight back in 3 point will it increase the tendency for a ground loop?

  11. #11

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    I have the cub extended gear and AOSS on my Husky. Added fairings to both and gained 8mph. 5 mph for gear fairings, 3mph for AOSS streamlined 'teardrop' fairings.
    Going to add the fairings to my supercub extended gear/AOSS too, should gain some mph back. Probably not as much as on the Husky, but will see.
    John

  12. #12
    cubdriver2's Avatar
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    Quote Originally Posted by CharlieN View Post
    At what point when moving the weight back in 3 point will it increase the tendency for a ground loop?
    Every 1/16"

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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