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  1. #1
    jw637362's Avatar
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    Scratch Build / Wing Loading

    I am almost complete with a Scratch Build Float Plane.
    I am concerned I did not make the wing loading enough as I didn't calculate the Float weight / Built afterwards.

    Electric setup with HiMaxx - HC3522-0990 rated up to 85 oz models

    Total Model weight w/floats = 3.5 lbs - 56 ozs
    Main Wing Area = 324" - 2.25 ft sq.
    24.88 oz/ft

    Seems a little high to me.

    I went with a slight under camber on the rib design to assist with lift off the water - that was the theory anyway.
    Can someone chime in and give me your thoughts. I am ready to build another wing un-sheeted going to 48" if needed.

    Thanks!
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  2. #2
    Lnewqban's Avatar
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    RE: Scratch Build / Wing Loading

    Wing loading is not terrible; go ahead and verify the cubic wing loading to make sure.

    Maybe the picture's angle, but the tail surfaces look a little too big respect to the wing and ailerons' area.
    Lnewqban - "God will not look you over for medals, degrees or diplomas, but for scars. He has achieved success who has worked well, laughed often, and loved much." - Elbert Hubbard

  3. #3
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Thanks Lnewqban:
    I have some shaping to do on them which reduce them a tad but over all width in the picture on the horizontal stab is 16" and height is 5.5 from top of fuse.

    Here is the Cube Load



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  4. #4
    All Day Dan's Avatar
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    RE: Scratch Build / Wing Loading

    jw, that's not a bad WL. Be sure to include the aileron area as part of the wing. By the way, those ailerons look a little small from here. Each one should have around 6 to 7 percent of the wing area. Dan.
    Dan

  5. #5
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    All Day Dan - I should have had them on the wing but the Picture would make them look small, They protrude, and I did not calculate them into the original. Did not know you could use that as part of the wing but I guess it is part of the flying surface.
    I can add reduce another oz wing load for that.

    Here is the aileron configuration.
    Appreciate the information!
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  6. #6

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    RE: Scratch Build / Wing Loading

    A wing cube loading of 16 is quite high, that will be a hand full to fly.

  7. #7

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    RE: Scratch Build / Wing Loading

    Subscribed... because I'm curious about the choices going ahead and how they go. I'm thinking another bay... or two.

  8. #8
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Well, after deliberation and the input from you all. Better safe than sorry. I have decided to increase the wing to 50".
    This will give me a wing area of 450" and reduces the Wing and Cube load.

    Not worth the risk[]
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  9. #9
    All Day Dan's Avatar
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    RE: Scratch Build / Wing Loading

    jw, you can never go wrong with more wing area until you don't have enough empennage area. You also will have to contend with the huge amount of area the floats represent. I can't help you since I have no experience with the type of model you are designing. Here's a set of very basic design guidelines from long ago. Dan.
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    Dan

  10. #10
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Awesome info, Ill read that this evening, saved too my hobby folder!

  11. #11
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Well, thought I would post a closer for this.
    Here is the finished product less the servo connections and rudder system, since completed after this picture was taken and I am ready to go to the pond.. or snow if the winds would stop.
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  12. #12

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    RE: Scratch Build / Wing Loading

    Best of luck with the maiden... and will be watching for a flight report.

  13. #13
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Went out and flew it today. Took off in a short run up, Flew level off the start and no slow flying stall characteristics. Did one barrel roll, happy with the design.
    The power on the other hand is another issue. The battery only lasted 2 minutes and started to die rapidly. Now comes the electrical questioning.

    Thanks for the support!


  14. #14
    jw637362's Avatar
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    RE: Scratch Build / Wing Loading

    Fixed the Power problem, Running 4 cells on a 65a SC. Runs like a champ now - For Grins...
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