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  1. #1

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    Aluminium bolts

    Hi,

    One way to save a bit of weight is to use Aluminium bolts, nuts etc for motor mounts, landing gear attachments etc. Aluminium is way lighter than stainless steel. Titanium is extremely strong but the weight is in-between Aluminium and Stainless steel and Titanium is a lot more expensive. So from a weight perspective Aluminium is the best, but is it strong enough? Have you guys been using say 3mm Aluminium bolts for the likes of landing gear attachments and if so have you had any unexpected failures?

    Regards
    Clint

  2. #2

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    RE: Aluminium bolts

    I use titanium screws. I also use aluminium lock nuts and washers.

    I would never use aluminium on an undercarriage.

    Cheers,
    Jason.

  3. #3

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    RE: Aluminium bolts

    Hi
    I have been using aluminium 4/40 bolts to mount my undercarriage for years with no failures I also use them to mount the motor where appicable again with no problems
    John

  4. #4

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    RE: Aluminium bolts

    On the undercarriage I use Aluminium in the rear bolts an nylon in the front. They brake before the plane does.

  5. #5

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    RE: Aluminium bolts


    ORIGINAL: mtcarey

    On the undercarriage I use Aluminium in the rear bolts an nylon in the front. They brake before the plane does.
    I've heard of this idea but won't ever use it myself.

    Even if the gear break away you're going to do extensive damage to the side of the fuse where the gear insert, and potentially even more to the belly of the fuse.

    I'd rather crack the landing gear than damage the fuse!
    Bob

  6. #6
    MTK's Avatar
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    RE: Aluminium bolts

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Regards,
    MattK
    (Rcmaster199@aol.com)

  7. #7

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    RE: Aluminium bolts


    ORIGINAL: MTK

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Glad to hear that the use of landing gear isn't obsolete yet
    www.helihotspots.blogspot.com
    Don\'\'\'\'t get caught by business directory scams: www.stopecg.org

  8. #8

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    RE: Aluminium bolts


    ORIGINAL: MTK

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Pony up! Let's see pix!!
    Bob

  9. #9

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    RE: Aluminium bolts


    ORIGINAL: cmoulder


    ORIGINAL: MTK

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Pony up! Let's see pix!!
    My money's on pop rivets

  10. #10
    MTK's Avatar
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    RE: Aluminium bolts


    ORIGINAL: bjr_93tz


    ORIGINAL: cmoulder


    ORIGINAL: MTK

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Pony up! Let's see pix!!
    My money's on pop rivets
    Oh my goshki.....What's the matter with you boys? You can't think outside the box can you?

    No fasteners at all
    Regards,
    MattK
    (Rcmaster199@aol.com)

  11. #11

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    RE: Aluminium bolts


    ORIGINAL: MTK


    ORIGINAL: bjr_93tz


    ORIGINAL: cmoulder


    ORIGINAL: MTK

    You guys still use bolts to mount your landing gear?? How...old fashioned, hehehe
    Pony up! Let's see pix!!
    My money's on pop rivets
    Oh my goshki.....What's the matter with you boys? You can't think outside the box can you?

    No fasteners at all
    Hot melt glue [X(]

  12. #12
    Jetdesign's Avatar
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    RE: Aluminium bolts

    I'm thinking about using aluminum bolts for my rear motor mount - 1 3/4" bolts inside a spacer. I've struggled with aluminum prop adapters, but the loads are pretty different here.
    Joe Marri
    Enjoying all things aviation.

  13. #13
    MTK's Avatar
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    RE: Aluminium bolts


    ORIGINAL: bjr_93tz

    Hot melt glue [X(]
    I'll clue you in....no screwy screws or nuts n bolts, and no frigging glue

    Now that the cat is out of the bag, you may be able to figure out the mechanics of the system I've developed. BTW - The concept is patent pending and I will be looking to license it
    Regards,
    MattK
    (Rcmaster199@aol.com)

  14. #14
    Bill Clark's Avatar
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    RE: Aluminium bolts

    heres a link to aluminum fasteners made from 7075 t-6 which is about 85.000 psi tensil  http://www.fastener-express.com/alum...s-washers.aspx. a alloy steel socket head cap screw manufactured to standards is about 180,000 tensil

  15. #15
    petec's Avatar
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    RE: Aluminium bolts

    A Kabajian Taper?
    Team YS, Team Airtronics
    Pattern Junkie, Revver Brother #82, Gear Head

  16. #16

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    RE: Aluminium bolts

    Or caper!
    Bob

  17. #17

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    RE: Aluminium bolts

    Naaaa.....more like rubber bands....I heard about that guy!
    Forget Mixing Your Own Fuel....It's Easy But No Longer Needed!

  18. #18

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    RE: Aluminium bolts

    I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

    Landing gear on model planes is poorly thought out

  19. #19
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    RE: Aluminium bolts

    I thought pattern pilots will never damage the landing gears:-)

    On a serious note, I like the idea of replacing four front steel motor mount mounts with itanium counterparts. Seems a good way to spend a couple dollars to cut 1oz. Of weight.

    I use aluminum bolts to hold wing tip blocks to the wing body on my Passport.

    BTW, I still have some spare 1" 4/40 alum socket bolts from bolts-express.com. Send me PM and I can mail you 10 for $3 shipped to cont. USA.
    Where facts are few, experts are many.
    Perfection is God\'\'\'\'s business.

  20. #20
    kenh3497's Avatar
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    RE: Aluminium bolts


    ORIGINAL: TimBle

    I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

    Landing gear on model planes is poorly thought out

    Sent from my Dry-Erase-Board

  21. #21

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    RE: Aluminium bolts

    I'mnot going to dismantle the entire bottom of my plane. Oh wait, I'll be fitting a Saito 180 to a 1.20 size pattern plane so I'l have to.

    wait 24hrs

  22. #22

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    RE: Aluminium bolts

    www.pro-bolt.co.uk

    for ti and Al bolts and nuts and washers

  23. #23
    MTK's Avatar
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    RE: Aluminium bolts

    ORIGINAL: TimBle

    I've developed quite a niffty landing gear system myself. I believe in keeping parts in tension to achieve maximum strength.

    Landing gear on model planes is poorly thought out
    WIST MODEL has the very best commercial technique. My method was inspired by them. The lightest set-up in my plane for gear, pants, axles and wheels and fuse mount was around 5 1/2 ozs

    The very lightest landing gear had to be Nat Penton's. He mounted a pair of carbon tubes through the wing. The wing mounts are 1/32" ply plates, about 3 sq inches on both sides of the wing, with a through hole or socket connecting the two plates.

    The carbon tube has more than enough strength and flex to handle 11 pounders. All up weight, including everything, was around 3 ozs. That's a fine weight...juuuuust a little out of the box thinking
    Regards,
    MattK
    (Rcmaster199@aol.com)


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