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1. 100 cg B00 Weight on front 1 24 Weight on rear i ed eae eli em es Sp 7 cece crore es Front wheel Mal i 3 REIR KS Rear wheel Mol E Head Stock Iw Rake angle 25 vp 511 mm Offset 35 Yvp 229 mm Pinect Rake Trail fet Multi plot B Load data Calculate Emaar Leading link example escription P i i Wheel Mal Ea Units converter Save data es Trailing link forks Enter the data exactly the same as for the LL type with appropriate coordinates except use a negative value for the value of L1 the main link The negative value signals the software that both links are trailing2. 50 60 80 90 110 Wheel displacement mm AntiDive 7 Trail Locus Units converter Wheel displacement mm AntDive Rake f Like BMW Duolever Hossack type Wheel trajectory Vert wheel displ mm LINS INTTI CINI Front only lifted elescopics at 25 rake 50 40 30 20 10 0 10 Horz wheel displ mm Copy graph to clipboard Save results Mult plat AntiDive Rake Trail 10 Appendix This appendix describes in full the use of the other software features Rake and trail calculator This is a simple tool to enable rake and trail calculations Enter data into any three of the four data entry boxes click on Calculate and it will calculate the fourth parameter For example if you know the required rake and trail values and wheel size then it will calculate the required offset necessary to give those values This is to calculate the missing value in a set of four given the other three The castor rake angle must be entered in degrees from the vertical not radians J as long as all three use the same lyre rolling radius e g all in mm or all in inches etc To uze just enter values for the three known parameters and then press the calculate button The missing value will then be entered by the computer IF you enter all four parameters then an error message will be displayed Be sure to leave one entry box completely empty zero is not the sa
3. There are several buttons here which either control the calculations or access other functions all are listed below and described in more detail in the appendices Fake rail _ Peke Trai Rake and trail calculator This is a simple tool to enable rake and trail calculations T Wheel Mol i Wheel polar moment of inertia calculator The wheel moments of inertia are used in the calculation of the anti dive characteristics _ Mutipot Graph plotting Allows the results of up to ten cases to be directly compared on one graph page Units converter Er Units converter Units converter Coverts between metric and imperial units of measure ROLE Load saved data Loads a previously saved data file containing all the dimensions of a saved case Save data Save data Saves the current configuration to a file for later recall Calculate Calculate Calculates the configuration and refreshes the graphic after any data changes RES Plot Displays several calculated characteristics throughout the range of suspension movement for the current case The pre defined graphs display anti dive rake angle trail and the trajectory of the wheel axle Results plots There are four sets of calculated parameters pre defined and plotted anti dive percentage rake angle trail and the trajectory of the wheel axle The first three are plotted for the two extremes of rear wheel position and the area between the two curves defines the r
4. Front suspension calculation TONY FOALE DESIGNS c April 2007 Licence management Hi Software User s Manual Version 1 1 Tony Foale Designs 2007 Last revision 04 09 2007 Contents Introduction First time use Principal screen Data entry area Graphics area Control button area Results plots Appendix Rake and trail calculator Wheel polar moment of inertia calculator Saving and loading data Multi plotting Example of Foale Parker GTS system 11 13 10 10 11 15 16 18 Introduction know of no other software suitable for analysing various parameters of interest such as anti squat etc for that class of motorcycle front suspension controlled by some form of swing arm and or pivoted links The oft used term Hub centre steering doesn t cover the whole range of these alternative designs and use the all inclusive term of FFE or Funny Front Ends hence the name on this software frequently needed to do such calculations and developed this software to fill the gap purely for my own work However as word got around of its existence received a number of requests from interested people to buy copies of the software saw no market large enough to warrant developing the software as a marketable item and sold a small number on an as is basis without any documentation However even though interest in these types of front suspension is very limited have spent some time to make this so
5. SimulationO2 erd 5 Click on the plot button ChainS mulation ls erd i duo lever erd The plotting window will now display duo lever01 erd 1 Select from the Xaxis and axis lists the parameters that you wish to duo lever0 erd plot and the appropriate graphs will be drawn duo leverds erd duo ever04 erd Other parameters can be selected from the list and plotted duo lever0E erd duo lever0 erd Tto 10 files can be selected for comparison plots Too many lines on the duo lever0z erd plot can make it hard to read hence the limit of 10 duc leverQe erd Bt eae T Clear selected file frorn list fst Plot graphs GTS03 erd _ Clear all files from list M Cancel nenatverake err FFE Analy FFE 4Analvsis Yamaha GTS The plotting window shown next has 3 areas On the left are 2 lists of the parameters which can be plotted The top one selects the parameter for the X axis usually the Wheel displacement The lower one selects the Y axis The graphs will change dynamically as you select different plotting parameters Along the bottom of the window are some buttons with fairly obvious significance except perhaps for the Scaling and offset Occasionally it is useful to be able to scale or offset the data before plotting The main area on this window is the plotting area which graphs a single parameter from each of the selected files 17 Graph plotting Line colours de aa ce GTS01 DUSDENSION Kin
6. This method is very sensitive to timing errors and is the hardest to get good timing because unless a long incline is available the time intervals are quite short 1 5 seconds and up slope length Slope angle 14 Pulley and weight Probably the most accurate method of the three but requires a little more preparation A small pulley about 100 mm diameter is ideal needs to be made that can be attached to the wheel concentric with its spin axis Some thin cord or flexible cable is wound around the pulley and the free end attached to a known weight 2 kg for example Using this method the wheel can be supported with its own axle which must be mounted sufficiently high to allow the weight to fall the equivalent of 2 or more wheel revolutions Using a pulley of 100 mm diameter the weight will fall just over 0 3 metres for each revolution The pulley should be a light as possible so that it contributes a minimum to the Mol of the wheel although in most cases it will be a simple matter to calculate its own Mol and subtract from the overall value but this is usually not necessary Layout of pulley and wheel R Pulley radius Possible pulley design Diameter nominal dia of cord 15 Saving and loading data There are two types of data that can be saved in the software Parametric project data Calculated results The parametric data refers to the physical parameters of the motorcycle For example upright di
7. ange of possible values for a particular parameter The wheel trajectory plot also shows the wheel path that would occur with telescopic forks at a rake angle of 25 degrees this is just for reference There are some special features available when the mouse pointer passes over a graph area e xX hairs appear automatically showing the X Y values e Marking points To mark a point just click and release without moving the mouse This will mark a point on a graph and show the X Y parameter values e Line drawing To draw a line click and hold at the start and release at the end The slope of the line will be calculated and displayed e Changing graph pages will remove the marks and lines e The graph data can be saved in numeric form to a file which can be later be used in the multi plotting feature to compare multiple cases e The graph window can be saved to the clipboard and subsequently pasted into other software for creating reports etc The following are typical results graphs Like BMW Duolever Hossack type er Anti dive percentage Anti dive 4 60 aa Hear extended Hear compressed 40 50 GO 70 a0 90 100 110 Wheel displacement mmm Copy graph to clipboard Save results _Mult plat ArHDI JU Rake Trail Locus Units converter Like BMW Duolever Hossack type Rake angle deg Save results Mult plot Copy graph to clipboard Rake angle ae Hear extended Hear compressed 40
8. ematics AEA A Tego GTS03 wheels On the plotting window above the area to the left shows that the wheel displacement has been chosen for the X axis and the anti dive percentage with the rear suspension extended for the Y axis The 3 graphs show this parameter pair for the 3 files selected from the previous screen This multi file plotting feature is extremely useful and is also very fast and easy to use 18 Example of Foale Parker GTS system FFE calculations All values in mm 7 Kg a X Y coordinates 634 1154 mm Full droop Full bump 1 366 j Ly 480 gt 4 Graphic E size Ka 144 Wheel displ 0 mm 2 630 Eha L upright 0 300 L upright 1 366 Offset 15 F wheel radius 300 Wheelbase 1600 Max front displ 120 Max rear displ 120 cg J650 Weight on front M2 Weight on rear ES Front wheel wt EN Front wheel Mal ER Rear wheel Mol ER Head Stack yp 2411 mm Yvp 268 mm Project are ol Rake Trai fet Multi plot E Load data EF Calculate description 37878 7 i Wheel Mal Ea Units converter Save data Er Plot 19 Example of Leading Link forks FFE calculations All values i Ka PARACHI ja g X Y coordinates 544 1154 mm Full droop Full bump 4 FE 4 Graphic E 200 size om 30 Wheel displ 0 mm Ya 420 _ Lz 180 F L upright 1 Offset 0 F wheel radius 300 Wheelbase 1500 Max front displ 100 Max rear displ
9. ftware more useful and have added some features as well as preparing this user s manual Although am now making this software generally available it is unlikely that the demand will be sufficient to continue any significant development but am always receptive to ideas and reports of any problems What will it do The software will analyze most forms of what might be called link suspension It will put numbers to four characteristics Viz anti dive percentage rake angle variation trail variation and wheel trajectory It will graph these parameters against suspension movement Designs which fit into this category include hub centre steered designs such as Difazio Bimota etc and other FFE designs such as Hossack BMW duo lever many of the Elf designs Foale Parker Yamaha GTS and many many more Although not designed with them in mind it will also handle head stock mounted forks like girders and leading trailing link What it will not do It will not handle any system with sliding elements such as the Saxon BMW telelever nor telescopics Tony Foale April 2007 First time use When the software is started for the first time you will be presented with the following licence screen Fill in your Ei Prepare registration email name used for purchase and click on the I button This will prepare an email in your default email client which can then be sent If you do not use the computer for email then you can make a note of the cus
10. hange the computer on which you use the software then firstly enter the above licence screen by ses t clicking the button on the opening window On the original computer Then click the af SEE J button Make a note of the un licence code that appears Install the software on the new computer and email the customer number for that machine with the un licence code from the first Principal screen FFE calculations All values in mm Kg ou La S X Y coordinates 305 1149 mm Full droop Full bump Y1 i 190 6 HAI Gone E LI 3126 me 20 Wheel displ 0 mm 2 815 L2 134 6 L upright 0 190 L upright 1 555 Offset 46 6 F wheel radius 300 Wheel base oa Max front displ Frs Max rear displ 110 cg 675 Weight on front FE Weight on rear 125 Front wheel wt i Front wheel Mal ER Rear wheel Mal ER Head Stack Kvp 6062 mm Yvp 230 mm Paice Rake Trail fst Multi plot E Load data Calculate asst Like EM Duolever Hossack type escription ri Le i Wheel Mol 7 Unite converter Save data Er Plot This screen ts divided into three main areas 1 Data entry on the left 2 Control buttons at the bottom 3 Graphic area showing a sketch of the front suspension system as defined by the data Data entry area All coordinates are to be determined with both front and rear suspensions fully extended with the wheels just touching the ground The origin of the coord
11. ike loaded Front wheel wt is the weight of the front wheel tyre and brakes etc Front wheel Mol and Rear wheel Mol are the polar moments of the front and rear wheels tyres and disks If this information is unknown then use a value of 1 will force the software to use default values which are quite close enough for most practical purposes A Mol calculator is built into the software and is described elsewhere in this manual Head stock forks some types of head stock mounted forks like the older Girders and Leading Link LL can be analyzed with this software but in those cases the steering axis is not defined by the line through the forward link joints but by the axis of the headstock itself In these cases tick the Head Stock option and enter the values of the head stock rake angle and the offset of the axle from that axis This will ensure the proper calculation of the rake and trail variation with suspension movement Note that in these cases the offset of the upright as described earlier is not the same as the offset from the steering axis In the case of link forks the upright offset will generally be zero but with girders it will likely be non zero Link forks do not generally have a part directly like the upright of girders or other types of link based front end Instead the axle is generally fixed to the end of the link itself but for the purposes of analysing the anti dive characteristics we can treat the caliper bracket or drum bra
12. inate system used to specify the location of the frame mountings of the two links is at ground level directly under the frame mounting point of the lower link Therefore the x coordinate of the lower link pivot is O and does not need to be specified All dimensions in mm Positive is to the right and upward Bottom link is link 1 X1 is O by definition Y1 is height of pivot above the ground L1 is the link length X2 Y2 and L2 have similar meaning for the upper link as X1 Y1 and L1 L upright 0 is the upright length from link 1 connection to link 2 connection L upright 1 is the upright length from link 2 connection to the axle measured as shown in the sketch below and may be greater or less than L upright 0 Offset is the normal offset of the axle from the steering axis Uppertink Lower fink yp 2411 mm Yep 268 mm L upright D Offset L upright 1 F wheel radius is the rolling radius of the front tyre Wheelbase is the horizontal distance between front and rear axles Max front displ and Max rear displ Are the maximum front and rear suspension movements of the wheels Ycg is the loaded CG height above ground level The CG height is used in the calculation of the anti dive percentage If you have an error in the Ycg input then the values of the percentage will be out but the trend of the variation will be similar Weight on front and Weight on rear are the loads supported by each tyre with the b
13. ke back plate as the upright Then L upright 0 L upright 1 and offset of the upright 0 An example data set is shown later For trailing link forks enter a negative value for the value of L1 the main link The negative value signals the software that both links are trailing Graphics area This shows an animation of the front suspension system as defined by the entered data There are controls for studying the movement of the suspension through its specified range After changing data click the calculate button to refresh the graphic Gers se All values in mm Ka Spies eal XY coordinates 349 1167 mm Full droop Full bump 1 E44 Le i l P Li 190 6 4 Graphic E Ka 28 Wheel displ 110 mm L2 M346 Scroll bar and button to exercise SUSPENSION size w L upright 0 190 L upright 1 563 Offset 146 6 F wheel radius 300 1 Wheel base i 572 Max front displ 110 Mas rear displ mo o cg es Weight on front 125 Weight on rear EN Coordinates of virtual pivot Front wheel wt ea relative to in tal reference Front wheel Hal E Rear wheel Mal E Head Stock I AYp 712 mm Yvp 282 mm Project Br oi Rake Tra Pat Multi plot Load data Calculate Jaaa ike BMW Cuolever Hossack type Wheel Mol Eai Units converter Save data Er Plot Xvp Yvp Coordinates of virtual pivot read only changes when you exercise the movement O Button area
14. me as empty There are two trail values real and ground The real trail is not available as input 11 T wheel Mol i Wheel polar moment of inertia calculator The wheel moments of inertia are used in the calculation of the anti dive characteristics This calculator is really three in one It can calculate the moments of inertia for three different methods of physical measurements The accuracy of the Mol values do not have a large effect on the anti squat values they are just a refinement to the calculations not a major part In many cases the Mol values will not be available if you do not have this information use the value 1 which loads default values into the calculations based on typical wheels according to their weight These default values will normally be sufficient It is not difficult to measure the actual moments of inertia There are many different ways of doing this depending on the facilities available but these calculators do the hard work for three simple methods of measurement They can be described as 1 Swinging pendulum 2 Rolling down an incline 3 Pulley and weight These methods will be described in detail Swinging pendulum Wheel Moment of Inertia calculator EE Front Wheel weight Kaf Rear m e Number cycles ESS p l Total period secs ef Swing radius mm Moment of Inertia Kg m 2 x Close Emp Update project Calculate The following photos show how the
15. mensions wheel size etc The calculated results are the characteristics of the system being analyzed such as anti dive wheel trajectory etc Parametric project data The data is stored in the concept of a project A project represents all the parametric data for a particular front suspension layout Saving and loading parametric data is just a question of selecting a file name and confirming Be PEPI as per usual software practice Use the button on the principal screen Saving calculated results These can be saved by clicking on the button at the bottom left of the results graphs Save in FFE Li ee Er 2 chaint erd E ChainSimulation erd E negativerake erd _chain02 erd duo leverO1 erd E positiverake erd _chainneg2 erd duo lever0z erd E positiverake erd _chainneg erd duo lever03 erd E testi erd _chainpos erd duo lever0 erd test erd _duo erd duo lever0 erd test3 erd _duoneg erd duo lever0 erd test4 erd _duopos erd duo lever07 erd zerorakez erd _GTS0 erd duo lever0 erd zerorake erd _GTSneg erd duo lever erd _GTSpos erd GTSO1 erd ChainSimulationO2 erd E GTs02 erd SL ChainSimulationts erd negativerakez erd My Computer a File name save My Network Saveastupe Multi plotting amp WinEP S ERD Cancel Places Mi R ecent Documents My Documents EL When saving both the parametric and calculated data it is suggested that you use a file name that will help identify the ca
16. olar moment of inertia of the wheels and tyres by any one of the 3 methods described in the User s Manual 1 Let the wheel wing like a pendulum and measure the time for several complete swings say 20 for example 2 Let the wheel roll down an incline of about 10 to 15 degrees and measure the time to traverse known distance starting from stationary 3 Fis small pulley to the wheel and use known weight on the end of thin cable to accelerate the wheel Measure the time period to complete 2 or 3 complete revolutions starting from stationary The results are expressed in g m 2 In this case the longer the slope the better and an incline angle of greater than 15 degrees is preferable If the incline is too flat the wheel will not accelerate quickly and will often tend to run to one side particularly rear wheels with the lateral weight offset of the sprocket and cush drive assembly It is possible to make a simple incline from wooden board thick enough not to bend under the weight of the wheel but 2 metres length at an incline of 10 degrees is about the minimum necessary to achieve sufficient timing accuracy 3 metres at 15 degrees would give approximately equal transit times but with greater directional stability Mark out a defined distance along the slope Hold the wheel at the higher mark and start timing at the moment of freeing the wheel stop the clock as it passes the second mark Repeat this several times and average the times
17. se when you return to it in the future 16 Multi plotting Pat Multi plot There are access buttons for this feature on both the principal screen and the results pages This opens a selection screen for choosing up to ten saved results files for comparative plotting The window will initially open into the default file save directory You can navigate to other directories if you saved the files elsewhere The second column will display a list of saved files Click on those which you wish to compare up to a maximum of 10 and they will appear in the plotting list across the bottom There are buttons to remove files from this list or clear it altogether Click on the Plot graphs button when you have listed the files of interest 3 in this example Re Comparison plots lc pnts Data files oe c api 7 Ls _ chain erd Suspension kinematics Documents and Settings chainneg erd Quick instructions ns _chainnege erd Administrator _chainpos erd 1 Select drive and folder where your EAD files are stored My Documents duollerd 2 Click on the filers that pou wish to plot the selected files maximum of SuspensionD ata duoneg erd ee and te de ee de i os ce se Ki i _duopos erd fou can remove files from the selected list below by selecting the file ARS SES GTS0 erd and clicking on the clear button _GTSnegerd I 4 Enter the Graph title in the bos above that you wish to appear at the _GTSposerd top ot each plot Chain
18. tomer code and send an email manually from another computer to info tonyfoale com You can then close the software Software licence management ARE Licence administration T Before using the software for the first time it Is necessary to get a licence code by email as follows To getthe licence code Enter your name Tony Foalel Your customer code A3 B 1B 04 F8 D8 2A ria Prepare registration email lf email is not available on this computer you can note the above details and send them from another computer to info tonyfoale com When you receive the licence code by email enter it here Guide to licence code entry M Cancel registration at this time IF possible copy and paste from the email to make sure that itis entered corectly Failing that here are some rules for manual entry Letters in capitals Letters only from 4 F 1 one not the letter 0 zero not the letter O Mo spaces before or after code but internal spaces are important A licence code will be emailed back to you When you receive this code restart the software and enter the code where indicated The software will shut down but will function fully when restarted It is important that you only use the licence code on the same computer that showed the emailed customer code Both of these codes are unique to each individual computer and will not work on another machine Procedure to transfer licence to another computer If you wish to c
19. wheel needs to be mounted off centre such that it can swing from side to side about an axis defined by the supporting bar In cases where there is no convenient symmetrical supporting locations rear wheels and single disc fronts the wheel can be supported by the bar just under the rim section The distance between the swing axis and the axle centre needs to be measured The wheel should be slightly displaced to one side and allowed to swing back and forth like a pendulum Measure the time required to complete a number of complete cycles 20 for example to reduce the effect of timing errors A swing amplitude of 5 degrees is quite sufficient This method has the advantage that only the minimum of equipment is needed to do the measurements Apart from a watch weighing scales and a ruler or vernier calipers a bar strong enough to support the wheel without excessive flex 10 mm diameter is usually sufficient and some means of supporting the bar horizontally is all that s necessary 12 13 Rolling down an incline QE Wheel Moment of Inertia calculator Front The period is the time for the wheel ape ice ea ey net aA to traverse the slope length starting bce al here with the wheel stationary Slope length m Total period secs a Slope length Moment of Inertia Kg m 2 Slope angle M Close Update project Calculate QUICK HELP This calculator determines the p
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