REFLECTOR: FW: Blended Winglets and intersection fillets.

[cgputney at genevaonline.com]

Larry,
Was the resulting radius 3 inches or 1.5 inches?
Gordon
  ----- Original Message ----- 
  From: Lawrence Epstein 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Wednesday, August 03, 2011 9:17 AM
  Subject: Re: REFLECTOR: FW: Blended Winglets and intersection fillets.


  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:







    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.

    Alex



    Nexus (prototype is a twin)







    Velocity Wing/winglet intersection fairing from aft (minus the rudder)





    View from the front




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