KR> ground effect and stall speed?
Does anybody know if ground effect lowers your stall speed? +++ I always believed that it did not, so I was surprised to read the compelling evidence from John M, viz., "Mine actually lifts off at 37 knots in ground effect and will fly a foot or so above the ground however stall at altitude is at about 42 knots". I suspect that the TAS does not change, but the IAS does due to the ground effect on airflow around the pitot. Would be interesting to hear from the KR that has the pitot on top of the Fin. For your purposes right now, I guess the best answer is yes - what you will see on the ASI will be lower in ground effect (compared to readings observed at altitude). What have you decided regarding the canopy latch and the turtle deck attachments? Good luck Steve J
KR> ground effect and stall speed?
At 05:57 PM 5/28/2005, you wrote: >Does anybody know if ground effect lowers your stall speed? I would think >so, at least some small amount, but I don't know for sure. If so, how much? Technically speaking, the stall speed decreases asymptotically to zero the closer you get to the ground but you will never see that in a practical case. The coefficient of lift does not continue to increase at the same rate and positive sink rate means you eventually come down. In the practical case, the stall speed will be as much as 1/2 the normal stall. That is one reason that you can lift off so far behind the power curve and not be able to climb out. 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 Aviation Surplus: http://aerofoilengineering.com/PartsListing/Airparts.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA State Fly-in: http://vaeaa.org
KR> ground effect and stall speed?
Steve Jacobs wrote: > What have you decided regarding the canopy latch and the turtle deck > attachments? I think my latches will be OK, but their attachment to the canopy frame is still suspect. I plan to epoxy an aluminum angle over the edge of the frame and connect the latch to it, rather than to the "post" that I have running into the frame now. I'd been thinking about running two layers of glass tape from the decks down to overlap the top longeron, mainly to keep water out and air in, so if I locally (at each end) make them out of three layers of carbon fiber and screw them into bosses at each end (epoxied just below the longeron) I won't worry about them any more... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net --
KR> ground effect and stall speed?
Does anybody know if ground effect lowers your stall speed? I would think so, at least some small amount, but I don't know for sure. If so, how much? Thanks, Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net --
KR> ground effect and stall speed?
Hi Mark Mine actually lifts off at 37 knots in ground effect and will fly a foot or so above the ground however stall at altitude is at about 42 knots. I try not to rotate and climb until about 55 -60 knots and I figured if it climbs out at that then I can safely approach using the same numbers in my earlier flights. any slower and the nose gets really high affecting visibility. John The Martindale Family 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA phone: 61 2 66584767 email: johnja...@optusnet.com.au - Original Message - From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Sent: Sunday, May 29, 2005 7:57 AM Subject: KR> ground effect and stall speed? > Does anybody know if ground effect lowers your stall speed? I would think so, at least some small amount, but I don't know for sure. If so, how much? > > Thanks, > > Mark Langford, Huntsville, Alabama > see KR2S project N56ML at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > -- > > ___ > 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
KR> ground effect and stall speed?
Mine would normally stall around 45 MPH at altitude. I have tried to stick the tail on landing before at 35 indicated feeling sure that it was way below stall speed and it just climbed right on up. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Mark Langford Sent: Saturday, May 28, 2005 5:57 PM To: KRnet Subject: KR> ground effect and stall speed? Does anybody know if ground effect lowers your stall speed? I would think so, at least some small amount, but I don't know for sure. If so, how much? Thanks, Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -- ___ 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
KR> ground effect and stall speed?
At 04:57 PM 5/28/2005 -0500, you wrote: >Does anybody know if ground effect lowers your stall speed? I would think >so, at least some small amount, but I don't know for sure. If so, how much? No, only drag. Larry Severson Fountain Valley, CA 92708 (714) 968-9852 lar...@socal.rr.com
