wing tip shape

[Jeff Hughes]

I've built two Hansen Runarounds, the first with the typical wing tip (ie: 
the ailerons did not run all the way to the tip) and one where they did. I 
couldn't tell the difference. Though I never flew them back to back (the 
first one crashed before I built the second one). I basically did that 
because I was lazy and when I asked about it on this discussion board about 
3 years ago, I got every answer imaginable. Most people did mention that 
they like the visual clue to trim. Dick Hansen said he couldn't tell the 
difference, that was good enough for me.   Now my Jupiter has round wing 
tips like a spitfire. It does not seem to snap near as well as my Focus II. 
But it could be a lot of things other than the wing tips. (though they look 
pretty cool cause they are built up tips).


----- Original Message ----- 
From: "Wayne Galligan" <wgalligan at goodsonacura.com>
To: <discussion at nsrca.org>
Sent: Wednesday, November 24, 2004 4:04 PM
Subject: wing tip shape


> Wing tip shape will generally affect the drag issue.  Different shapes
> designed to reduce the vortex created by the tip.  Booster tips and 
> winglets
> being the most common design as seen on most of the modern full size
> designs.
>
> Test results from a model Prescott Pusher 1/5 scale being built.   Some
> tests on a this model airplane with std tips and shaped or booster 
> tips(tips
> shaped downwards) did improve the stall characteristics.  With the shaped
> booster tips the model would not spin upright but would go into a long
> spiral dive, however, inverted would spin and recover as with a normal 
> wing
> tip.    RCM 4-2004 pg 114
>
> In a pattern plane I don't think the shape, as long as it is shaped
> symmetrically, would have any if little effect on the way our planes fly.
> I do agree that taking the aileron all the way out just puts it in the
> vortex and can only decrease the effectiveness at the tip.   Like Troy 
> said,
> and I agree,  make it look good and go fly.
>
> Smooth FLying...
>
> Wayne Galligan
>
>
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