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?
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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
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