1/3rd scale Cessna 152 rc

Discussion in 'Sheet Metal' started by Aviation geek, Jun 10, 2019.

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  1. Jun 10, 2019 #1

    Aviation geek

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    hello guys I’m new to the forum and in need of advice
    I’m building a large scale Cessna 152 out of aluminium
    I have the plans and want to keep the build as close to original as possible
    I have made all the spars for the wings so far my concern in the Alu I’ve used seems really soft It’s most likely 1050grade but I can’t be sure I know the full size is built using 6062 I. Believe
    Would 1050 grade not be suitable ?im having trouble sourcing thin alu sheet like 0.5mm and thinner I’m kind if of guessing what thickness will work
    Could any one offer advice ?
     
  2. Jun 10, 2019 #2

    Aviation geek

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    The work so far but I need to think about flanging now
     

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  3. Jun 10, 2019 #3

    BBerson

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    This isn't an RC model forum. But to answer your question, aluminum less that .016" is referred to as foil. It only comes in low alloy such as 1100 soft or hard rolled.
    Try alufoil.com.
     
  4. Jun 11, 2019 #4

    fmartin_gila

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    0.5mm = 01968498. You can get 0.020 Aircraft grade aluminum from Aircraft Spruce, Wicks, or many other suppliers.

    Fred
     
  5. Jun 11, 2019 #5

    bmcj

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    Typical RC balsa models tend to be lightweight with light wing loading, so then the question becomes can you make it with aluminum to be as strong and stiff as balsa but still be as light as a balsa-built version? If you can, then it should work. If not, then it may still work, but you will have to balance strength vs weight in your design.
     
    Last edited: Jun 11, 2019
  6. Jun 11, 2019 #6

    Victor Bravo

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    I remember when Aircraft Spruce used to sell .012 aircraft sheet metal. Look into the aluminum sheets that were once used in offset printing, I recall those are pretty thin. Sorry to post bad news, but I would not be at all surprised if your model comes o=out far heavier than you want. There is probably a lot of .020 and .025 and .032 sheet in the 152, and scaling that down to 1/3 is going to be a problem.
     
  7. Jun 11, 2019 #7

    TFF

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    Unless a display aircraft, you can’t scale materials. At least not all. Anything sheet is 2024 on a 150. 1000 grade aluminum that thin is going to be a nightmare to rivet. I know there was a nice Pilatus PC 6 made from aluminum. It’s going to be detailed. At 1/3 it’s not a huge model, even though I don’t build stuff that big. I stop at 1/4. Lots of little stuff to make. I use to see a nice 1/3 Aerobat at contests
     
  8. Jun 11, 2019 #8

    geraldmorrissey

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    Whats the point? Now you have a big model you have to store thats basically worthless. Build somthing with a 36" to 48" wing span that flys well and can be transported in an average car. Make it FF if you have tbe skill
    Gerry
     
  9. Jun 11, 2019 #9

    Tiger Tim

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    Don’t be discouraged by these guys AG. Take your questions over to RCGroups where I’m sure you’ll get plenty of help. Aluminum giant scale RC models appear to be gaining popularity, I seem to remember a company selling near-ARF kits for some seriously large B-25s among other things. There was also a huge Zenith CH-701 at the Top Gun RC competition a couple years ago that was all metal and very impressive.
     
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  10. Jun 11, 2019 #10

    ultralajt

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    This one was build from 0,4mm thick aluminum:
     
  11. Jun 11, 2019 #11

    Aviation geek

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    Thanks for the info guys I wanted some advice from real aircraft builders as this is something I’ve not done before
    It’s pretty clear the alu I’ve got right now isn’t going to be suitable aircraft spruce do 0.16thickness 2024T3 I would think that’s a better start although finding something thinner for the skin may be difficult and again the weight issue
     
  12. Jun 11, 2019 #12

    MadRocketScientist

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    I was looking into thin strong aluminium, a source may be the plates that used to be used to print newspapers might be a source?
     
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  13. Jun 11, 2019 #13

    TFF

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    My point is things like spars need to be thicker than scale. You don’t want it to be egg fragile. RC planes get picked up by hands. A friend bought a world class FIA pattern plane from a past world competitor a few months ago. It’s sitting on a table and I want to see how light it was. Where I picked it up was wrong. I noticed right away. You can pick it up by the main and tail gear only. Fuselage is 1/16 balsa with 3/4 oz fiberglass on each side. Beautiful. I like my tank strong older pattern plane more.
    Make the inside a little stronger so it can support the under strength outside.
     
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  14. Jun 11, 2019 #14

    FritzW

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    When you say "plans" do you mean regular Cessna 152 plans or plans for a large scale 152?
     
  15. Jun 11, 2019 #15

    Aviation geek

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    Hi fritz
    I only have plans drawn up for a large scale 152 are the full size plans even available ?
    At the moment I’m referencing the parts Catalog along with pics from eBay of the various components that I can find
     
  16. Jun 11, 2019 #16

    BBerson

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    Beer cans are .004" hard foil. Cut one apart with scissors.
    As I mentioned, Alufoil sells all sizes, .004", 008", 012", 016" etc.

    .004" bonded to foam works well.
     
  17. Jun 11, 2019 #17

    TFF

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    No full scale plans are available. You need to visit an airport with GA maintenance on the field and take pictures of cessnas during annual. They will be open and you can put a ruler on some stuff. You building from Hollister plans?
     
  18. Jun 11, 2019 #18

    Aviation geek

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    Tff
    Yeah I guessed there wouldn’t be any full size available in just thinking a 10m roll of paper would be interesting to deal with !
    No these plans are from eBay for a balsa model i guess
    It would be really easy to make from wood but I like a challenge I’ve priced up the alu sheet from aircraft spruce in the states and shipping cost is astronomical. !
    So that’s not an option anymore
     
  19. Jun 11, 2019 #19

    radfordc

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    FritzW and bmcj like this.
  20. Jun 11, 2019 #20

    Aviation geek

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    Wow hadnt seen these before
     

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