I wrote: "you have to correleate your airspeed to ground speed..."
And Steve Jacobs wrote: "Why? Anything other than TAS is irrelevant." WHY? Because the man is trying to do engineering calculations, so what Joe, Bob, or Bill's airspeed indicator is reading at stall is irrelevant without some frame of reference to tie back to the real world, and about the only one that's even remotely easy to correlate to is ground speed from a GPS. Airpseed indicators and static/pitot systems are notoriously inaccurate at low speeds. Just throwing a number at him as gospel is guaranteed to give him inaccurate data, which is not what he needs. I assume he's trying to design a plane that will meet Sport Pilot regulations (don't shoot me, I'm just the messenger). Just look at the spread of "stall speeds" in the list at http://www.kr-2.aviation-mechanics.com/krinfo.xls ...they range from 46-60 mph. And if my correct "clean" speed were on there, it would be 46-62. I think you missed the point of his question and my answer... Mark Langford, Harvest, AL see homebuilt airplane at http://www.N56ML.com email to N56ML "at" hiwaay.net ----- Original Message ----- From: "Steve Jacobs" <[email protected]> To: "KRnet" <[email protected]> Sent: Saturday, March 18, 2006 4:19 AM Subject: Re: KR> Stalls @ gross weights > you have to correleate your airspeed to ground speed, ... > > +++++++++++++ > > Why? Anything other than TAS is irrelevant. > > TAS (IAS or CAS) is all the pilot has to inform him of the onset of a > stall. > I agree that it would be dufficult to establish and quanyify TAS at stall > (or any other flight situation) due to position error, instrument error, > calibration and even static source - thus important to establish the stall > speed in terms of IAS for each airplane. > > Have a great weekend > Steve > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html >
