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Thread: Landing gear weight

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  1. #1

    Join Date
    Jun 2019
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    Palos Verdes, Ca.
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    Default Landing gear weight

    Hello everyone!

    I put in a deposit on a 7 SS about a month ago. Due July 2020, canít wait to start building. I have this dream (spelled - hallucination) that I will do some ďgentleĒ back country flying with it - not up to cowboys level, but I want to give it a try. I want to build it asp an LSA. I have been looking at videos and doing as much reading as possible. I really like the shock monster/cabane v arrangement. I have time in cubs, so Iím somewhat familiar with how a cabana works and feels. I have virtually no experience with Grove. I have flown Aeroncas with spring gear.

    The combined weight of my wife and I, full fuel, and 25 pounds of camping gear would come to about 520 lbs. using the current LSA maximum (AOPA AND EAA say itís going up) of 1320, that means the build (I plan a 914 engine) can be no more than 800 lbs. does any one have figures on the relative gear weights? I plan 26 inch tires and likely a bushwheel tail wheel, maybe a Beringer anti ground loop tail wheel.

    i would appreciate any thoughts.

    Thanks

  2. #2
    Super Moderator Av8r3400's Avatar
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    Default Re: Landing gear weight

    I won't be popular for this answer, but I see no realistic reason for the "shock" style gear for most situations. If you are doing extreme STOL, off-airport ops, maybe, but for most it is a lot of money, excess drag, and complexity.

    I am running Grove spring gear and couldn't be happier with the system for my needs. You can look at my YouTube channel and see how the gear works for me.
    Av8r3400
    Kitfox Model IV
    The Mangy Fox
    912UL 105hp Zipper
    YouTube Videos

  3. #3
    Senior Member HighWing's Avatar
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    Default Re: Landing gear weight

    I once contacted Grove to determine the installed weight of their gear for a Model IV. Their website at the time indicated 25 lbs. for the gear. I was told that including mounting brackets and hardware it would be a little over 32 lbs.
    Lowell Fitt
    Goodyear, AZ


    My You Tube Channel

  4. #4
    Senior Member Esser's Avatar
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    Default Re: Landing gear weight

    Cabane gear is a couple pounds lighter than the Grove (Grove is close to 40lbs I think) but slower. I have a 914 powered Model 7 with a lithium battery, constant speed prop and when I did the weight and balance on 26" tires it came to 878. I have a new project I'm slowing picking on and my goal is under 800lbs and I'm going pretty extreme on the plane's diet to get there. Not to say it isn't possible but just to be realistic, you need to be conscious about saving weight everywhere you can.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  5. #5
    Senior Member fastfred's Avatar
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    Nov 2016
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    herkimer,ny
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    Default Re: Landing gear weight

    Can you share the list of what you end up doing to it? Hopefully the FAA with boost the gross weight up petty soon for the LSA and won't be an issue for me. I rarely would ever get myself in afield short enough to have a problem. Why do you need it so light with all that power ?You must be off in 150 feet most days?

  6. #6

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    Aug 2020
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    Rathdrum ID
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    Default Re: Landing gear weight

    Quote Originally Posted by Esser View Post
    Cabane gear is a couple pounds lighter than the Grove (Grove is close to 40lbs I think) but slower. I have a 914 powered Model 7 with a lithium battery, constant speed prop and when I did the weight and balance on 26" tires it came to 878. I have a new project I'm slowing picking on and my goal is under 800lbs and I'm going pretty extreme on the plane's diet to get there. Not to say it isn't possible but just to be realistic, you need to be conscious about saving weight everywhere you can.
    Josh,

    I am building a 5 with a 914/Airmaster. Do have a weight & Balance that you could share with me? What tailwheel do you have?

  7. #7
    Senior Member Delta Whisky's Avatar
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    Default Re: Landing gear weight

    I've captured reported weights for some time now and as of now my very limited data base shows:
    w/o outliers w/o outliers
    Model KF4 KF5 KF5 KF6 SS7 SS7
    average 676 841 820 906 836 827
    Max 793 1,013 890 906 963 878
    min 560 777 777 906 736 763
    sigma 76 69 35 0 56 33
    count 5 9 8 1 19 16
    The columns labels "w/o outliers" represent me taking out variants caused by what could be "scale dreaming" and heavy engine choices but still only makes a 9 pound difference for the SS7.
    BTW - when I converted to TK-1 shocks (only, not their gear) it cost 8 pounds.

  8. #8

    Join Date
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    Corona, CA
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    Cool Re: Landing gear weight

    The zipper 1484 big bore kit will give you 114 hp, add the performance cam and that will bring up to 120 hp. The cylinders are a thing of beauty if your a gear head like me with better finning. Of course I didnít stop there I have the SDS electronic fuel injection and variable timing also by SDS. Not having a dyno available to me like the Zipper folks have, I can only guess another 5 hp or so.
    Pulled out my W&B for the Kitfox 7, itís 826lbs (nose dragger) with Grove gear, magnum whole airplane parachute, MGL 10Ē EFIS, a210 com, transp, and iPad.

    Zipper makes a bigger bore kit but I still like looking out and seeing the wings in the right place.

    btw: I have no stake in either company.
    RV 7A flying.
    Kitfox 7 flying.
    Lucky seven's

  9. #9
    Senior Member
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    Nov 2013
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    Boise, ID
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    Default Re: Landing gear weight

    Quote Originally Posted by michaega View Post
    The zipper 1484 big bore kit will give you 114 hp, add the performance cam and that will bring up to 120 hp. The cylinders are a thing of beauty if your a gear head like me with better finning. Of course I didnít stop there I have the SDS electronic fuel injection and variable timing also by SDS. Not having a dyno available to me like the Zipper folks have, I can only guess another 5 hp or so.
    Pulled out my W&B for the Kitfox 7, itís 826lbs (nose dragger) with Grove gear, magnum whole airplane parachute, MGL 10Ē EFIS, a210 com, transp, and iPad.

    Zipper makes a bigger bore kit but I still like looking out and seeing the wings in the right place.

    btw: I have no stake in either company.
    Iíll be in San Diego Thursday and Friday. Iíd like to chat about your upgrades if youíve got time. I can rent a car and come up. PM me if that is doable.

  10. #10

    Join Date
    Jun 2019
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    Palos Verdes, Ca.
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    Default Re: Landing gear weight

    Thanks to everyone. Iím hoping to get the plane around 825 empty weight. May not be possible with options and reasonable avionics.

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