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larger version of Miss 2 with ailerons - dihedral ?

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Old 03-22-2016, 03:56 AM
  #1  
Brunox
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Default larger version of Miss 2 with ailerons - dihedral ?

Hi, after having built the Miss 2 from Hobby Lobby, I decided to enlarge the plans to 135% and start a scratch building, including ailerons on the wing.
The wing is now nearly finished but I realize the dihedral is only 4 degrees (I expected 6 degrees at least) and I'm afraid this may be unsufficient for this plane. It is supposed to be a very gentle and forgiving flyer... Could anyone provide some advice ?
Thanks

Bruno
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Old 03-22-2016, 05:33 AM
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ron ward
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what doe the plans call for ?. the reason I ask is that tat you really shouldn't have to increase the angle, just because you increased the size of the plane. simply put, 4 degrees at 4 feet is four degrees at 6 feet as well and will have the same effect on stability in either size. if the original size plans called for 4 degrees the plane will respond the same way to the same degree of dihedral when increased in size.
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Old 03-22-2016, 06:27 AM
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Brunox
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In fact the original plane (picture below) does not have ailerons and has a double dihedral in the wing... I wanted to have 6 degrees but after gluing the right and left pieces of the wing it has only 4. One option would be to cut the center section of the wing and to increase the dihedral but it will be hard to do since I used epoxy...
Thanks
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Old 03-22-2016, 06:34 AM
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Rodney
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With ailerons, your present dihedral is plenty. It is only when you do not have ailerons that you need dihedral. In fact, many planes designed with ailerons eliminate the dihedral entirely to eliminate the undesirable effect of having yaw coupling as the ailerons are activated.
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Old 03-22-2016, 09:30 AM
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It'll be just fine. As mentioned the ailerons take the place of the dihedral.

It's a good thing that you took out the tip dihedral. I've read a fair number of reports that lots of dihedral does not play well when combined with ailerons.
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Old 03-23-2016, 05:10 AM
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Brunox
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Thank you for your answers ! So I put my saw aside and leave the wing as is... and go on with the tail and fuselage...
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