I'm with Don. I'm thinking the previous owners were a little VG crazy. Given that the person who placed these VG's more than likely had no actual method applied to the placement, they are likely to be ineffective on any case. 0.02c Cheers. Pete.
-------Original Message------- From: Donald Reid List-Post: krnet@list.krnet.org Date: 07/23/06 02:22:52 To: m...@propilots.net; KRnet Subject: Re: KR> Vortex Generators At 08:45 AM 7/22/2006, you wrote: >My KR2 (built by others) was fitted with heaps of VGs under the >horizontal stab, on the fuselage prior to the rudder, on the landing >gear and in front of the canopy. A previous archive search suggested >that it lowers stall speed and if placed correctly has no speed >effect. There are none placed on the main wing (original aerofoil). >I don't understand why the previous owner wanted to lower the stall >speed of the horizontal stab, but not the main aerofoil...and why >the association with the rudder and canopy? Were they just VG crazy? >Any thoughts? The vortex generators upstream of the tail surfaces will/can improve control authority at low speed by keeping the airflow attached to the elevator or rudder when they are deflected. As for the gear, canopy, and other non wing-type surface, the only reason to put them there that I can think of is that the previous owner did not know what he was doing. Tripping the flow from laminar or turbulent to separated in a controlled manner (which is what a vortex generator does) can sometimes reduce drag, but only if it is done correctly. A vortex generator is not the proper way to do this. I suggest that those can be removed and you will not notice any difference. Don Reid - donreid "at" peoplepc.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://aerofoilengineering.com KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA Regional Fly-in: http://vaeaa.org _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
