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Thread: At long last!

  1. #1
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    Default At long last!

    Well today was the second flight of the monster!



    Appart from a slight overheating problem and a broken steering cable mount (again) things went really well...



    It actualy flies a lot better with two heavy people in it than with a lightweight like me on my own





    I think I will have to add a second steering cable to try and decrease the stress on indavidual components because at full chat i am struggling to move the rudders



    [img]index.php?t=getfile&id=214&private=0[/img]





    Video to follow as soon as my laptop repairs itself!
    Attached Images Attached Images

  2. #2
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    Default !

    looks good mate!



    little pointer regards the steering, well the rudders really! if at full chat you cant turn the steering, and or it turns better in one direction than the other! then your rudders are not balanced. putting on another cable with help you, but its not solving the problem! one push pull morse cable should be enought to do the rudders. so take a look at them, and set them up so they are balanced, it will give better steering response also! if you dont know what i mean about a balanced (aerofoil) rudder. then will email you a diagram!




  3. #3
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    Default Re: At long last!

    Yes, please email me a diagram



    Thanks.

    Duncan

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    Default Re: At long last!

    It's not complicated, Duncan. The distance from the rudder pivot to the leading edge should be 20-23% of the total rudder width (assuming a reasonable aerofoil shaped rudder).



    Even if the rudder is balanced it can still be difficult to move when the craft is unbalanced, as it is during a side-slip in a cross wind - the only solution in that situation is to back off the thrust momentarily.

  5. #5
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    Default Re: At long last!

    i recently had a rudder problem, someone advised i move the pivot to 1/5th length of the rudder - problem was solved and rudder now self-centres well and operates correctly



    the 1/5th distance means some of your thrust air assissts the rudder in turning and therefore takes effort off your cable



    hope that helps and well done on your maiden voyage



    Tony

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    Default Re: At long last!

    My rudders are already setup like that though....



    I think..



    See attached photo...(black line is the pivot point)



    Dunc
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    Default Re: At long last!

    Dunc,



    It certainly looks like they are pivoted around the correct place, However,, after seeing the big angle cut from the front, I should clarify my 20%, to be 20% of the area of the rudder should be in front of the pivot. You can expierment with the overhang by using bits of cardboard taped the the front or rear edges to extend them a bit (it should last long enough to give you an idea).



    It may be worth checking the pivots aren't binding when thrust is applied to the front rudder edge.



    If none of these things work then you'll just have to eat more spinach


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    Default Re: At long last!

    Maybe if I describe how the steering feels it might help?



    With the rudders sraight at full chat you really have to give it some efort to get them to turn, and then once they are turned they move ok.



    any thoughts?



    Do you think its worth addind a second cable so they are pull pull rather than trying to push?



    Dunc

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