<div>Funny, I don't think anyone has mentioned coriolis effect yet. :-)</div> <div> </div> <div>Bob R.</div> <div><BR><BR><B><I>Ron Lockhart <ronlock@comcast.net></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Assuming earth is flat - well of course! Same as aircraft carrier. <VBG><BR>And in this case agreeing with Georgie, expect for a few mountains.<BR><BR>Later, Ron<BR><BR>----- Original Message ----- <BR>From: "george w. kennie" <GEOBET@GIS.NET><BR>To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>Sent: Monday, October 15, 2007 9:46 AM<BR>Subject: Re: [NSRCA-discussion] Weather Vane or Crab<BR><BR><BR>> <BR>> Welllll,.......except for a few mountains...................<BR>> <BR>> <BR>> ----- Original Message ----- <BR>> From: "James Oddino" <JODDINO@SOCAL.RR.COM><BR>> To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> Sent: Sunday,
October 14, 2007 8:50 PM<BR>> Subject: Re: [NSRCA-discussion] Weather Vane or Crab<BR>> <BR>> <BR>> > Ron, you are assuming the earth is flat. (vbg)<BR>> > <BR>> > Jim<BR>> > <BR>> > <BR>> > On Oct 13, 2007, at 9:42 AM, Ron Lockhart wrote:<BR>> > <BR>> >> Hi Ken,<BR>> >><BR>> >> I think my original phrasing is correct, but let me try restating in<BR>> >> different words and using<BR>> >> some specific examples- This concept would be sooo much easier to <BR>> >> describe<BR>> >> and understand<BR>> >> with the white board and beer, which I agree is looking better all <BR>> >> the time<BR>> >> <VBG>)<BR>> >><BR>> >> Case 1. No Wind.<BR>> >> Pilot desires airplane to go to a point that is directly north, or 360<BR>> >> degrees from present position.<BR>> >> There is no wind.<BR>> >>
Durring flight airplane the pilot should fly the airplane on <BR>> >> heading 360<BR>> >> degrees. Track will be 360 degrees.<BR>> >> Airplane will get to desired point.<BR>> >><BR>> >> Case 2. There is wind from west across desired direction of <BR>> >> flight- Pilot<BR>> >> MISSES destination.<BR>> >> Pilot desires airplane to go a point that is directly north, or 360 <BR>> >> degrees<BR>> >> from present position.<BR>> >> There is wind from 270 degrees (from left of airplanes intended track)<BR>> >> If pilot flys airplane on heading 360 degrees, it will not get to <BR>> >> desired<BR>> >> point, it will get to a point to right (or east)<BR>> >> of the intended point. During flight airplane heading (direction <BR>> >> it is<BR>> >> pointed) will be 360 degrees. Track will not<BR>> >> be 360, it will be something
to the right, such as 010 degrees. No <BR>> >> weather<BR>> >> vane is present. The 010 track<BR>> >> is caused not by a weathervane effect, but by the body of air <BR>> >> moving from<BR>> >> west to east while airplane progresses<BR>> >> through it on north heading.<BR>> >><BR>> >> Case 3 Wind direction still across desired direction of flight- <BR>> >> Pilot FLYS<BR>> >> A CRAB ANGLE, and hits destination.<BR>> >> Stubborn pilot still wants to go to a point directly north of present<BR>> >> position, despite wind from 270 degrees (west).<BR>> >> Durring flight airplane the pilot should choose to fly the airplane on<BR>> >> heading 360 degrees, MINUS some number<BR>> >> of degrees. Lets say pilot guesses 10 degree correction, so pilot <BR>> >> flys<BR>> >> airplane on heading 350 degrees.<BR>> >> This is a pilot
choice to fly heading 350. The body of air moving <BR>> >> from west<BR>> >> to east will not do it for the pilot.<BR>> >> During flight heading will be 350 degrees. Track will be 360 degrees<BR>> >> (ASSUMING that the pilots<BR>> >> "Guess" of a 10 degree correction was right.) Airplane will get to <BR>> >> desired<BR>> >> point. During this flight, (and in<BR>> >> Case 1 and 2) a yaw string would be straight, no wind hits side of <BR>> >> airplane.<BR>> >><BR>> >> I'll have a Coors lite.<BR>> >><BR>> >> Later, Ron<BR>> >><BR>> >> ----- Original Message -----<BR>> >> From: "Ken Thompson" <MRANDMRST@COMCAST.NET><BR>> >> To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >> Sent: Saturday, October 13, 2007 9:37 AM<BR>> >> Subject: Re: [NSRCA-discussion] Weather Vane or Crab<BR>>
>><BR>> >><BR>> >>> Hey Ron,<BR>> >>><BR>> >>> Would I be correct in assuming your quote in parenthesis should read,<BR>> >>> "During that flight, airplane "intended" heading and track will <BR>> >>> not be the<BR>> >>> same", or are you pointing out that a plane will "somewhat" crab, <BR>> >>> on it's<BR>> >>> own, in a crosswind?<BR>> >>><BR>> >>> BTW: I like the white board and beer idea;-)<BR>> >>><BR>> >>> Ken<BR>> >>><BR>> >>> ----- Original Message -----<BR>> >>> From: "Ron Lockhart" <RONLOCK@COMCAST.NET><BR>> >>> To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >>> Sent: Saturday, October 13, 2007 8:16 AM<BR>> >>> Subject: Re: [NSRCA-discussion] Weather Vane or Crab<BR>> >>><BR>> >>><BR>>
>>>><BR>> >>>> If a pilot is flying to a specific point and points a trimmed <BR>> >>>> airplane<BR>> >>>> directly at that point, and there is wind<BR>> >>>> somwhat perpendicular to the intended flight track over the <BR>> >>>> ground the<BR>> >>>> airplane will not get to that point.<BR>> >>>> The airplane will get to a point down wind of the intended point.<BR>> >> (During<BR>> >>>> that flight, airplane heading and<BR>> >>>> track will not be the same. There will be no wind hitting side of<BR>> >> plane.<BR>> >>>> A<BR>> >>>> yaw string on nose will be<BR>> >>>> straight down fuse) I suppose we just lost a few folks here....<BR>> >>>> (sigh)<BR>> >>><BR>> >>> All this would be a bunch easier with a white board and beer.
<VBG><BR>> >>>><BR>> >>>> Later, Ron Lockhart<BR>> >>>><BR>> >>>><BR>> >>>> ----- Original Message -----<BR>> >>>> From: "Ken Thompson" <MRANDMRST@COMCAST.NET><BR>> >>>> To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >>>> Sent: Saturday, October 13, 2007 12:48 AM<BR>> >>>> Subject: Re: [NSRCA-discussion] Weather Vane<BR>> >>>><BR>> >>>><BR>> >>>>> Jim and all,<BR>> >>>>><BR>> >>>>> Most of us realize the plane will do as you and others have <BR>> >>>>> described,<BR>> >> my<BR>> >>>>> only point in questioning this is...is it called "weathervaning" <BR>> >>>>> while<BR>> >>>> it's<BR>> >>>>> in the air, or is it called "wind induced yaw or
crab"?<BR>> >>>>><BR>> >>>>> Best to you in your recovery.<BR>> >>>>><BR>> >>>>> Ken<BR>> >>>>><BR>> >>>>> ----- Original Message -----<BR>> >>>>> From: "James Oddino" <JODDINO@SOCAL.RR.COM><BR>> >>>>> To: <ALBERJI@CHARTER.NET>; "NSRCA Mailing List"<BR>> >>>>> <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >>>>> Sent: Friday, October 12, 2007 7:14 PM<BR>> >>>>> Subject: Re: [NSRCA-discussion] Weather Vane<BR>> >>>>><BR>> >>>>><BR>> >>>>> If it does, this is my<BR>> >>>>>> definition of weathervaning.<BR>> >>>>>><BR>> >>>>>> I'm recovering from an emergency appendectomy so I'm depending <BR>> >>>>>> on all<BR>> >>>>>> you other
guys to go try a cross wind stall turn with no rudder<BR>> >>>>>> command tomorrow and report on your results.<BR>> >>>>>><BR>> >>>>>> Best Regards, Jim O<BR>> >>>>><BR>> >>>>><BR>> >>>>><BR>> >>>>> _______________________________________________<BR>> >>>>> NSRCA-discussion mailing list<BR>> >>>>> NSRCA-discussion@lists.nsrca.org<BR>> >>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>> >>>>><BR>> >>>><BR>> >>>> _______________________________________________<BR>> >>>> NSRCA-discussion mailing list<BR>> >>>> NSRCA-discussion@lists.nsrca.org<BR>> >>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR>> >>><BR>> >>>
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