REFLECTOR: FW: Blended Winglets and intersection fillets.

[Lawrence Epstein]

We made a 3"radius fillet at the Fuselage to strake intersection, top &
bottom. We did this using pour foam which we then sanded down with a 3" PVC
pipe and then covered with BID.

We had some engineers at a certain Aerospace company in Mohave (thanks Ken!)
look at the prospect of doing the same thing on the wing-winglet interface
and the feeling was that the drag reduction would be minimal and the exact
shape required would necessitate extensive testing. The blended winglet
would work better here.

I will attach photos when I get access to them (maybe tonight).

Larry Epstein

On Wed, Aug 3, 2011 at 9:22 AM, Alex Balic <velocity_pilot at verizon.net>wrote:

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> Regarding Kevin’s e-mail from Monday- Yes, significant drag reduction for
> airfoil-to-airfoil intersections like on the winglet to wing area, and good
> drag reduction on fuselage to wing interface areas- I have just finished
> molding up diverging fillets for my upper cowl- to go with the ones on the
> winglets- according to the designer of the AR-5 (and many others) these
> areas become  significant source of drag at higher speeds - I have included
> construction pics – they have since been finished… I will post pics of the
> wing –to-cowl fillets if anyone is interested.  I have the foam forms shaped
> on the aircraft, need to get the layups done on them this week.****
>
> Ron Gowan (multiple long EZ builder) is working on producing a new kit that
> uses true blended winglets (not just fillets) it is called the Nexus- see
> pic below -he will be trying to market it at some point- I have enclosed a
> picture of that one for the winglet details,  but his spars are actually
> single pieces that run up into the winglets with the radius at the
> intersection, so it would be difficult to recreate on a **Velocity**.****
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> Alex****
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> Nexus (prototype is a twin)****
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> **Velocity** Wing/winglet intersection fairing from aft (minus the rudder)
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> View from the front****
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