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Date: Sat, 15 Mar 2003 21:38:43 -0500
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From: "Larry Henney" <LHenney@dellepro.com>
X-Original-To: "'Lancair Mailing List'" <lml@lancaironline.net>
Subject: RE: [LML] Re: Sun n Fun Race length, coordinates, etc
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Lorn Writes:
I calculate the length of the Lakeland 100 mile race at 76.1 nm or 87.5
statute miles.
Gentleman,
It is true that GPS distances are 6 miles less than course computed
speeds. I suspect that 2 miles were added to each of 3 x 120 deg turns
(or 2 x 120 turns and 2 x 60 deg turns depending on how you look at it).
This increase in distance is arguable based on speed & G (varying turn
radii). Although it has to be somewhat arbitrary (varying bank angle) ,
the fact that it exists is accepted and added to triangle courses. No
airplane that I'm aware of could simply turn on a dime (accept the NASA
HARV-F/A-18) We used to use a Combat Plotter in the Navy that had speed
and bank angle distances. It had 1 NM tick marks around the radius of
the turn. This way you could fly up to a visible turn point and turn
with a known distance. This would make low level ingresses accurate to
within a few seconds with very little pilot skill required (which was
very helpful to me of course).
Hope this helps to clarify and minimize "the timers cheated" syndrome
from lack of understanding.
Larrry Henney
N360LH
My plaque reads 209.96 Kts
I claim with a straight face that it flew and flys 210 kts.
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<DIV><FONT size=3D2></FONT></DIV>
<DIV><FONT face=3DTahoma></FONT><SPAN class=3D610460519-15032003><FONT =
face=3DArial=20
color=3D#0000ff size=3D2> Lorn Writes:</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003></SPAN> </DIV>
<DIV><SPAN class=3D610460519-15032003> </SPAN>I calculate the =
length of the=20
Lakeland 100 mile race at 76.1 nm or 87.5 statute miles.<BR><BR><SPAN=20
class=3D610460519-15032003><FONT face=3DArial color=3D#0000ff=20
size=3D2> Gentleman,</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003></SPAN> </DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff size=3D2>It=20
is true that GPS distances are 6 miles less than =
course computed=20
speeds. I suspect that 2 miles were added to each of =
3 x 120=20
deg turns (or 2 x 120 turns and 2 x 60 deg turns depending on=20
how you look at it). </FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff size=3D2>This=20
increase in distance is arguable based on speed & G (varying =
turn=20
radii). Although it has to be somewhat arbitrary =
(varying bank=20
angle) , the fact that it exists is accepted and added=20
to triangle courses. No airplane that I'm aware of could =
simply=20
turn on a dime (accept the NASA HARV-F/A-18) We used to use a=20
Combat Plotter in the Navy that had speed and bank angle=20
distances. It had 1 NM tick marks around the radius of the =
turn. =20
This way you could fly up to a visible turn point and turn with a =
known=20
distance. This would make low level ingresses accurate to =
within a=20
few seconds with very little pilot skill required (which was very =
helpful to=20
me of course). </FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff size=3D2>Hope=20
this helps to clarify and minimize "the timers cheated" syndrome =
from=20
lack of understanding.</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Larrry Henney</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>N360LH</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff size=3D2>My=20
plaque reads 209.96 Kts</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff size=3D2>I=20
claim with a straight face that it flew and flys 210 =
kts.</FONT></SPAN></DIV>
<DIV><SPAN class=3D610460519-15032003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN=20
class=3D610460519-15032003> </SPAN></DIV></BLOCKQUOTE></BODY></HTML>=
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