Who is Bill Mitchell?
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1. Exhibit at Autosport Engineering Trade Show in Birmingham,
England. Jan 12-13.
2. Improve Ackerman steering analysis.
3. Improve description of force computations. See Compute: Force computations
4. Improve force computations for Bell Crank / Pivot Rod suspensions.
1. Improve DaTaS / Racesim processing
2. Add Reports: Points: User Co-ordinates
3. Add Reports: Solved: User Co-ordinates
1. Work on Ackerman and Kingpin analysis.
1. Table menu gets Multi-file command to replicate Data Display graph.
2. Improve T-Bar graphics and analysis.
3. Add Point description to GEM Format points see GEM file Points
4. Change Ackermann calculation. See Ackermann Analysis form
May 2006 - Release
1. Introduce version 4.01 with revised Ackermann calculations. The calculations
better reflect a percentage of classic Ackermann. The calculation based on
steering arm angle is removed. See Ackermann Analysis form
2. Formula SAE East competition in Auburn Hills, Michigan. May 17-20.
3. Write Race Car Engineering story on Formula SAE East
1. Formula SAE West competition in Fontana, California, June 15-17
2. Write Race Car Enginering story of Formula SAE West
1. Improve running speed of external solver calculations, such as Sheering and
2. Data box permits control of Ride and Roll with the mouse.
3. Improve Solid-Model graphics of Uprights with an axle.
4. Improve Solid-Model graphics of A-Arms with an attachment base with a
5. Solid-Model graphics can now show only the left or the right side. This is
very useful for side views when showing both sides confuse the display.
6. Correct bug in solid-model graphics of MacPherson Multi-Link suspensions. The
calculations were correct but the graphics did not properly display chassis
1. Correct bug in No-Lateral Link solid-axle suspensions.
2. Work on Roll Center explanation program.
1. Add Compute: Mouse control capability
2. Add Roll Center explanation to the Analysis menu.
1. Update References in the Help file.
2. Separate Further Readings by author.
3. SCCA Runoffs at Heartland Park in Topeka. October 9-15, 2006
4. Mark Hansen of Vehicle DynamiX suggests Front Halfshaft analysis for
four-wheel drive and front-wheel drive vehicles. This considers the location of
the halfshaft relative to the steer axis or kingpin axis. This is a major
consideration in high-horsepower (800 hp) four-wheel drive vehicles with lots of
suspension travel for off-road racing.
5. The original Halfshaft Analysis routine gets a graphic scale factor.
6. Add Design: Halfshaft to place the outboard end of the halfshaft on the sheel
axis. See Design: Halfshaft and Wheel Axis
1. Add Steering Tierod Analysis which aims the tierod at the instant center to
minimize bump steer. It also makes it easy to adjust the length to minimize
second-order bump steer. See Analysis: Steering Tierod and Bump Steer
and Steering Tierod
2. WinGeo3 gets Asymmetry Alert. See Utility: Asymmetry Alert
3. WinGeo3 gets Compute: Path Analysis: Cancel and Compute: Map Analysis: CANCEL
to stop multi-position analysis. This is very important when the file generates
4. Analysis Ackermann (see Analysis: Ackermann ) gets geometric construction for
Enhanced Jeantaud diagram.
5. Release the WinSteer / Jeantaud teaching program.
December 2006 -
Release version 4.02
1. Introduce version 4.02 with Roll Center explanation. This explanation is
based on my SAE paper presented at the SAE Motorsports Engineering Conference.
It clearly explains the proper use of roll centers. See Analysis: Explain Roll
2. SAE Motorsports Engineering Conference in Dearborn, Michigan, Dec, 5-7.
3. Present SAE 2006-01-3617 paper Force-Based Roll Centers and an Improved
Kinematic Roll Center.
4. Present SAE 2006-01-3638 paper Analysis of Ackermann Steering Geometry.
5. Exhibit at PRI Trade Show in Orlando, Florida. Dec 14-16.
6. Add Plunge to results vector for viewing in GAP.
7. Add ability to connect Spring to the lower link of a solid rearaxle
8. Improve the Analysis: Solid Rearaxle report with more information. See
Analysis: Solid Rear-Axle