If I recall correctly, the 200mph VNE is because that is the generally accepted maximum speed assuring a reasonable flutter margin for unbalanced flight control designs.
Adam Deem On Sun, Apr 14, 2024 at 1:14 PM Larry Flesner via KRnet < krnet@list.krnet.org> wrote: > > On 4/14/2024 2:59 AM, Steve Loebs via KRnet wrote: > > > So, my question is how are you guys defining Vne? IAS or TAS? > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > Until someone posts a more definitive answer I'll post what I assume to be > the general knowledge on the subject. The only VNE limit I ever recall > seeing or hearing is the KR2 plans book that simply states "VNE is 200 > MPH". How that was determined and is it IAS or TAS, nobody knows except > maybe Ken Rand. To my knowledge no changes were made to VNE with the KR2S > supplement, the new airfoil, or any other dimensional changes made in the > 2S. As every KR is different in some way the way the VNE is actually > determined is in phase one testing of each individual aircraft. There is a > lot of "experimenting" in the design / testing of "Experimental aircraft". > I suspect the Freebird will use the same numbers unless someone with a > plans-built Freebird wants to do some ligament testing. The only testing > I'm aware to have ever been done, other than phase one testing of each > aircraft, is the new airfoil that was wind tunnel tested at the University > of Illinois. > > This is a photo taken at about 300 feet during the decent on a low pass > in 211LF with Mark Langford in the right seat as I recall. I'm pointing to > the 200 mph indicated on the ASI. The color markings are not "official" > speeds but speeds I felt comfortable with. The "white" range is for the > speed brake and the "yellow" range is the speed I felt comfortable with in > rough air. The 3/16" wire wrapped bolt below the compass is the temporary > fix for a broken T-handle on the pull starter and not an indication of the > build quality of 211LF. 🙂 Zach, the new owner, was up flying yesterday > watching the needle on the ASI spin around the dial and the T-handle was > repaired long ago. > > Larry Flesner > > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet >
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