REFLECTOR:Experimental:Lower Winglets

Scott Baker reflector@tvbf.org
Tue, 27 Jan 2004 17:23:32 -0500


Hello Jack,
I imagine the same aerodynamic principles apply.  It's no problem to make
some temporary lower winglets for testing - fabricate them from blue foam
and duct tape them to the lower wing.  Do some slow flight testing starting
at 6", then saw off the bottom of the winglet extensions in 1" increments.
I'm curious myself what length works the best for the Standard wing.
Best regards,
Scott B.

----- Original Message ----- 
From: "Jack Hayes" <jetjock@frontiernet.net>
To: <reflector@tvbf.org>
Sent: Tuesday, January 27, 2004 12:44 PM
Subject: Re: REFLECTOR:Experimental:Lower Winglets


> Scott,
>          any words of wisdom for the standard wing?
> ----- Original Message -----
> From: "Scott Baker" <sbakr@comcast.net>
> To: <reflector@tvbf.org>
> Sent: Tuesday, January 27, 2004 12:27 PM
> Subject: Re: REFLECTOR:Experimental:Lower Winglets
>
>
> > Kurt -
> > Just wanted to share that the factory did some experimenting with the
size
> > of the lower winglets on the XL wing.  We found 5" to be the "magic"
> number.
> > We started out with a 2" lower winglet and then kept adding more length
> > during successive trial runs.  The response and "feel" of the aircraft
got
> > better and better until we reached 5" - after which more lower winglet
> > didn't add much of an improvement.
> > Scott B.
> >
> > ----- Original Message -----
> > From: <NMFlyer1@aol.com>
> > To: <reflector@tvbf.org>
> > Sent: Tuesday, January 27, 2004 10:19 AM
> > Subject: REFLECTOR:Experimental:Lower Winglets
> >
> >
> > > I love reading all the different theories and ideas that people have,
> > makes me feel slightly less odd.
> > >
> > > I have the 173 FGE. Since Canards are such runway hogs, and high
density
> > altitude is a factor here, I made quite a few "adjustments" to my V.
> > >
> > > Canard:  No elevator cuffs, and factory VG's.
> > >
> > > Winglets (tipsails): Lower winglets are 2" instead of the full size,
to
> > keep spanwise flow from sliding off the edge of the wing. As a bonus,
they
> > look a whole lot better than the full size lowers.
> > > I also made my rudders full length. This just happens to make the
rudder
> > the same size as if I had full lower winglets.
> > >
> > > Wings: I will use the vortilons, and possibly the fences, we shall
see.
> > >
> > > PowerPlant:  340HP Aluminum V-6 Chevy, 76" 3 blade CS Prop.
> > >
> > > Derated by density altitude, I should still have tons of power for
> takeoff
> > around here.
> > >
> > > The whole goal was to be able to depart my home (5000' before DA takes
> > effect), from a 5000' runway. Any possible speed increase will just be a
> > bonus!
> > >
> > > This is all still theory since I am not flying yet, but the test
should
> > come this summer. If I would have followed the directions, I would have
> been
> > done a couple years ago..... but may not have been able to fly on a hot
> day
> > out here. We shall see.
> > >
> > > Kurt Winker.
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>
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