Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Fri, 02 May 2003 10:13:29 -0400
Message-ID: <redirect-2330712@logan.com>
Subject: Re: SUN 100 & Suffolk 100 Distance
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From: "Lorn H. Olsen" <lorn@dynacomm.ws>
In-Reply-To: <list-2071993@logan.com>
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> From: Sky2high@aol.com
> Date: Tue Mar 18, 2003  7:26:35 PM America/Detroit
>
> Feathers, et al:
>
> When one studies the SUN 100 course, it can be shown that ... 360 high=20=

> speed turning degrees.
>
> Using Fig 2.29 (Constant Altitude, Steady Turn Performance) in=20
> "Aerodynamics for Naval Aviators" (NAVWEPS 00-80T-80) on can find that=20=

> at 200 KTAS and a 60 degree banked turn, the radius is 2000 feet.=A0=20=

> Thus, Pi x D =3D 12566 feet or 2.07 Nautical Miles.
>
> The turning radius for 200 KTAS, 30 degrees is about 6000 feet or 3=20
> times that of a 60 degree turn.=A0 Thus, taking turns at 30 degrees=20
> would add 6.2 NM to the course.
>
> Grayhawk
> N92EX

Grayhawk & Grease,

I finally thought that I would do the calculations in great detail for=20=

the Sun 100 Race. I used 7 points to calculate the distance. They were:

1) 500 ft from the touchdown end of runway 9
2) 500 ft past the end of runway 9
3) the SE GPS coordinates of the course
4) the SW GPS coordinates of the course
5) a point 1/4 nm W of the touchdown end of runway 9
6) the starting point

The total distance came out to be 77.1 nm. Being the course is listed=20
at 82 nm, it looks like 4.9 nm was added to the course length or about=20=

5 nm.

To verify this distance, I talked the Jerry Agular(sp) at Aircraft=20
Spruce(AC). Jerry is in charge of the course.

I had Jerry explain why the course was listed as 82 nm. His response=20
was that it had been listed at 82 nm since before there were GPSs or=20
recorded history. He said that a few years ago the GPS coordinates were=20=

taken on the ground. The coordinates seemed to confirm that with turns=20=

the course was about 82 nm.

The exact distance of the Suffolk 100 is 87.5 nm. If we add about 5 nm=20=

to that we get 92 nm. We have listed on the Suffolk 100 web page that=20
the course is 93 nm. The calculated speed differential caused by this=20
one mile distance would be 92/93*200 =3D 2.2 kts. In other words, we=20
would be showing higher speeds of about 2.2 kts when compared to the=20
Sun 100 race.

I hate to recommend it but i think that we should set the Suffolk 100=20
course distance at 92 nm. With this setting our speeds will compare=20
directly with the Sun 100 speeds.

Other opinions are welcome.
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-478-4301, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, N31161, Y47, SE Michigan=