Who is Bill Mitchell?
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1. Exhibit at Autosport Engineering Trade Show in Birmingham,
2. Debrief3 gets improved processing of MOTEC CSV files.
3. Analysis: Solid Rear-Axle gets stagger calculations.
4. Improve Clipboard: Save file: Graphic do remove gray box from the bitmap.
5. Add Analysis: Bell-Crank Rotation to calculate the angle of rotation for
push-rod and pull-rod suspensions.
1. Add Graph menu to make these useful commands easier to find. These commands
were previously in the View menu under Screen Layout
2. The Design command Implement button now updates graphs.
3. Clipboard menu can save JPEG files, which are much smaller than Bitmap (BMP)
4. Build: Compare Files gets a distance between points value as well as the
differences in each direction.
5. Create Demo files for Bird-Cage 4-link solid rear axles for dirt track
1. Roll Center explanation now does roll resistance from spring as well as
2. Setup shows Right side or Left Side or Both sides in larger font.
3. Correct calculation bug on left side suspensions in the Setup form.
4. Discuss Roll Center Myths and Reality at SCCA NEOhio Competition Clinic in
Cleveland, March 17, 2007.
5. Drive Angle added to Values list. It is the inclination of a line from the
SVSA to the center of the drive axle. This is commonly used in dirt track racing
for solid rear axles.
1. Implement Anti-Outboard and Anti-Inboard for solid-axle rear suspensions.
2. Closing the form will save a file names CurrentFileClose.gem if you choose to
save without overwriting the current file. This was a suggestion from Mark
Hansen of Vehicle DynamiX.
3. Index value added for birdcage solid rear axles. Index is identical to Caster
except for the name and the lack of Caster Trail as a second value.
4. Editing Combo Boxes for attaching springs, shocks and Data Pots are limited
to valid choices.
5. Analysis: Angles gets the angle between the A-arms and the Kingpin axis. This
is designed to measure ball joint rotation. See Analysis: Angles This was a
suggestion from Mark Hansen of Vehicle DynamiX.
6. Analysis: Auxiliary is added to provide the locations of the spring, shock
and data pots. This was a suggestion from Mark Hansen of Vehicle DynamiX. See
7. Utility: Measurement option permits absolute length of spring, shock, data
pot, 3rd-spring, halfshaft and driveshaft or the displacement from static
location. See Utility: Length measurement
8. Analysis: 3-D angles is added to the program. This form calculates the angles
of a triangle in three dimensions.
9. Add Geometry Control Dialog button to the 3-D View panel and menu.
10. The Axis Caclulator can show either Dynamic or Static points. See Axis
Calculator form and Axis Calculator: Dynamic Points. It can also show both
static and dynamic points together.
1. Formula SAE competition in Romeo, Michigan, May 16-20.
2. Add Geometry Control Dialog: Color by Files checkbox to show roll centers for
multiple files in distinct colors.
3. Add Edit: Show Points being edited.
4. The Path editing form gets a Set All Options button.
5. Add the ability to Close a specific file, other than the Last file or All
6. Add Design: Solid Rear-axle Settings to compute Camber based on Tire size and
Toe based on Wheelbase_Offset or fore-aft difference in contact point.
7. Add Values: Toesteer expressed as difference in fore-aft location of the tire
contact points for a solid rear-axle oval track car.
8. Update the Reports: Points output. See Reports: Points: RbyN Co-ordinates and
Reports: Points: User Co-ordinates
9. Implement new mathematical method for solid rear-axles. This method is better
suited for tire stagger or static toe.
1. Formula SAE-West competition in Fontana, California, June 13-16.
2. Add Center Point to the force computations. This allows the user to specify a
specific point to apply a tire force.
3. U-Type Swaybars may now be attached to the Hub or Upright.
4. Symmetry requires the Center of Gravity to have Y=0 and be on the centerline
of the vehicle.
5. Utility: Second Shock or Data Pot allows this variable to be renamed for dirt
track applications with two shocks per corner.
1. Release Formula SAE version of WinGeo3.
2. Motion Ratios and Velocity Ratios are marked with an MR or VR following the
3. The Geometry Control Dialog is able to save and recall combinations of
4. The Geometry Control Dialog can locate Values at specific places on the
5. The RearLink program will analyze Mumford Link suspensions. See Files: New:
Mumford Link, but only in two dimensions. WinGeo3 does not do Mulford Links.
6. Add Lessons to WinGeo3 based on classes.
7. Add command to set graph scale.
8. Add “How to fix Bump Steer” description. See Lesson #2 - How to fix Bump
9. Explain Roll Center gets slot showing FAPs (Force Application Points)
10. Show Force-Based Moment Arm in addition to the kinematic roll center.
11. The Camber explanation form is added to explain ride-camber and roll-camber.
12. Caster Split is added to the list of Values:
13. The Graph menu gets graph Dialog commands and Goal Values.
1. The Roll Center Stability form explains the advantages of a stable roll
center and a consistent moment arm.
2. The Tire Spin and Plane of the Tire form examines the kingpin variables from
the plane of the tire rather than the chassis plane. As the suspension moves the
locked wheel point on the wheel may move. This can change the effective caster
and caster trail. See Analysis: Tire Spin and the Plane of the Tire This applies
to both independent and solid rear-axle suspensions.
3. Improve the Tire Deflection Special Display to show multiple files.
4. Add Analysis of Roll Center Center of Pressure Variation form.
5. Path file can perform Tire Deflection calculations.
6. Update Anti-Dive and Anti-Squat percentages.
September 2007 - Release Version 4.03
1. Analysis: Camber Explanation gets Frame-of-Reference choice between Ground
2. Enhance description of Anti- factors. See Anti-Dive, Anti-Squat form,
Understanding Anti forces and Designing for Anti forces.
3. Add a general description of all available values.
4. The Motion Ratio Values for Springs, Shocks, Data Pots and 3rd Springs are
separated from Derivatives.
5. Begin Glossary of terms
6. Redo Bell Crank Axis form.
1. SCCA Runoffs, Heartland Park. Topeka, Kansas. October 8-14
2. Compound springs added: See Edit: Forces (compound springs) and Analysis:
3. Add a report to show the solved points in the Chassis Frame of Reference..
4. Ted James suggests adding a Read Me file. This is done with a Read Me button
to the introductory screen. This button triggers a popup menu pointing at Help:
Frequently Asked Questions, Help: Glossary, Help: History, Help: Lessons and Hot
5. Roll Center Explanation gets options for Lateral Load transfer and
Longitudinal Load transfer.
6. Add Quick Summary sections to the Menu commands. These are designed to aid
the new user in learning his way around the program, See Files menu, Compute
menu and many others. They are collected in the Quick Summary of Pulldown menus
7. Add Design: Rear-axle Lower Link, Design: Rear-axle Upper Link and Design:
Rear-axle Panhard Rod commands to assist with the design of solid rear-axle
suspensions. These commands allow the user to specify the length of a link while
changing the height of the axle end of the link.
1. Improve the Camber Explanation form with Ride Camber, Roll Camber and Ride
Scrub plots. See Camber explanation form
2. Drive Angle can be specified as Outboard or Inboard in Edit: Halfshaft and
Values: Drive Angle
1. PRI Trade Show in Orlando, Florida, Dec. 6-8