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Seaplane troubles

734 Dexa  6.1 years ago

Problem: Big ass plane using 8 turbo props and still wont lift off from water, max speed on water is 168 and it’s takeoff speed is around 200

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    You still have this problem?

    3.7 years ago
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    @Dexa Bouyancy in front of the main wings is fine. Everything behind the main wings needs to be able to drop at least 30° during takeoff (and you don't want it underwater so bouyancy is fine as long as its not preventing the plane from tilting up in the front), notice how much the belly slants upwards towards the tail of this PBY Catalina:

    https://www.archaehistoria.org/images/aircraft/blue catalina.jpg

    If you are still having trouble, you can private-post what you have and link me in the comments. I'll check it out when I can.

    6.0 years ago
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    734 Dexa

    Btw can I send u a pic from discord and you can tell me if the bouancy is to much on the belly? Can’t tell@F104Deathtrap

    6.0 years ago
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    @Dexa Nose shouldn't effect things. Mostly wings and everything after the wings.

    6.0 years ago
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    734 Dexa

    Also I am using the same nose design as the Dehal Model 8 1989 and Dehal Model 32 1938@F104Deathtrap

    6.0 years ago
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    734 Dexa

    Discord me if it’s easier Pink Pepe #5268

    6.0 years ago
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    @Dexa Let me know how it turns out. I can send parts if needed.

    6.0 years ago
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    734 Dexa

    Thanks going to school rn but I am going to get to it!

    6.0 years ago
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    @Jetpackturtle @RailfanEthan @jamesPLANESii @Delphinos

    His problem is a high center of thrust. Seaplanes put the props up high to keep the waves out. But a high center of thrust pulls your nose down just like a low one pulls the nose up.

    Increasing thrust only increases the problem. Increasing lift can eventually help, but only with an absurd amount of it, far more than the plane should need.

    To counter this, you need big horizontal tail surfaces and you need to angle them with the leading edge downward by a few degrees. Usually less than 5° is enough, often 1° or 2°.

    The other problem is people make the belly of the plane wrong. If the back half of the plane isn't raised out of the water, it will either sink deep into it when you try to take off or it will be so bouyant that it won't sink and instead prevent the plane from nosing up. Obviously you could make a plane with so much lift that it can pull itself up without nosing up at all, but this would be a very slow plane indeed and horribly inefficient.

    +1 6.0 years ago
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    @Dexa This is important. Do not do any of the stuff people have listed below. The reason people don't build many seaplanes on here is because the problem you are having right now.

    If you spawn your plane in the air, (bandit final approach), do you notice that the the nose is constantly dropping, even with full throttle? If so, then I can give you advice that will fix it.

    6.0 years ago
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    you need to XML the prop's power and maybe set propeller pitch to +70

    6.0 years ago
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    5,289 GreatHenry

    Hardcore.
    Ba-Dum-Tsss...

    6.0 years ago
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    Moar lift

    6.0 years ago
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    29.0k TigerEye35

    Big ass plane...

    6.0 years ago
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    Prop engines are buggy when it comes to taking off in water. :/

    6.0 years ago
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    734 Dexa

    Thanks! @Delphinos

    6.1 years ago
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    35.6k Delphinos

    There are three possible ways to solve it :
    - reduce weight
    - set main wing type to "semi-S" or "flat bottom",
    - increase engine horsepower,

    6.1 years ago