USER MANUAL FOR THE PROGRAM LOFT 97
Contents
1. willl automatically add dxf for you di USER FEEDBACK CARD We want to keep in touch with our users Please fill out this card and mail it to Vacanti Yacht Design Name Address City State County Zip Code or Mail Code Country Phone Where did you Purchase This Program When How Much Did You Pay How would you rate the user manual Excellant Good Poor How would you rate the program Excellant Good Poor VACANTI YACHT DESIGN SOFTWARE PROBLEM REPORT 17226 163 PL SE RENTON WA 98058 USA NAME STREET CITY STATE COUNTY PROVINCE ZIP CODE PHONE DATE Instructions Use this form to report software bugs documentation errors or suggested enhancements Mail this form to Vacanti Yacht Design at the address above Category Software Problem Software Enhancement Documentation Problem Other Product Description Program Name Rev Number Computer Used CPU Chip Peripherals Graphics Card Math Coprocessor 8087 80287 Problem Description Please be complete as possible giving operating conditions and suggested remedy if any2. USER MANUAL FOR THE PROGRAM LOFT 97 Version 1 0 C Copyright 1998 By VACANTI YACHT DESIGN DISCLAIMER OF WARRANTY THIS SOFTWARE AND MANUAL ARE SOLD AS IS AND WITHOUT WARRANTIES AS TO PERFORMANCE OR MERCHANTABILITY THE SELLER S SALESPERSONS MAY HAVE MADE STATEMENTS ABOUT THIS SOFTWARE ANY SUCH STATEMENTS DO NOT CONSTITUTE WARRANTIES AND SHALL NOT BE RELIED ON BY THE BUYER IN DECIDING WHETHER TO PURCHASE THIS PROGRAM THIS PROGRAM IS SOLD WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER BECAUSE OF THE DIVERSITY OF CONDITIONS AND HARDWARE UNDER WHICH THIS PROGRAM MAY BE USED NO WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE IS OFFERED THE USER IS ADVISED TO TEST THE PROGRAM THOROUGHLY BEFORE RELYING ON IT THE USER MUST ASSUME THE ENTIRE RISK OF USING THE PROGRAM ANY LIABILITY OF SELLER OR MANUFACTURER WILL BE LIMITED EXCLUSIVELY TO PRODUCT REPLACEMENT OR REFUND OF THE PURCHASE PRICE LOFT 97 JE File Edit Calc Output Window Help Caer T Roofosorzwi ef Edit Design Parameters den dk rM Ballast Analysis Lift Drag Analysis Calculate Loadline E Leading Edge View X E Profile View X INTRODUCTION This program allows the designer to LOFT keels or rudders in either metric or english units using either Parabolic or Elliptical trailing edges When using english inches units both inches eigths and sixteenths as well as decimal inches are printed out LOFT also provides extensive hydrostatics calculatio
3. am by selecting BEGIN A NEW FILE or EDIT AN OLD FILE from the FILE menu list PRINTING COPIES OF THE SCREEN LOFT 97 Supports all Windows Printers Main Design Screen S LOFT 97 olx File Edit Calc Output Window Help Calculator bt Root 63 012 wl Tip 63 012 wfl Calculate Hydrostatics Ballast Analysis Lift Drag Analysis Calculate Loadline E Leading Edge View X ES Profile View X The main screen provides the ability to make design changesand perform analysis on an existing design The three primary views are always shown of the keel under development To make changes to the design simply select EDIT DESIGN PARAMETERS This will bring up the Design Parameter dialog box To begin a new design select File New This will create a new untitled design open the Design Parameter dialog box To create a new design simply modify the default values found in the dialog box When the design parameters are entered press OK and the design will be drawn in 3 views as shown above The top or Plan view shows the shape of the keel or rudder as viewed from above We have drawn only the root chord near the hull and the tip chord furthest from the hull for clairity This makes it easy to see how a bolt pattern will lie relative to the tip chord or the degree of sweep needed to accommodate the rudder shaft Editing A Design 5 Data Entry Root Chord 3 000 T 9 er Root Thickness 12 000 6 000 D Tip Chord Inch D
4. at 5 Knots 29404 Ped BASE I3 LE LL IL LL LLL LA E LL UL LL III TL LLLILILTL IT sl TT TT TT Leeway Angle Degrees 2 3 4 5 6 7 8 9 10 Lift Force Drag Force Leeway Angie Degrees Print Lift Drag The Lift and Drag analysis features of LOFT 97 represent a significant design capability LOFT allows the designer to predict the actual pounds or kg of force that are produced by the keel or rudder design as a function of angle of attack Angle of attack is leeway angle for the keel and rudder steering angle for a rudder in addition to the leeway E z zi LI D 2 5 fra Lift to Drag Ratio The actual amount of lift or drag that is produced by the keel ro rudder is dependent on the velocity of the boat Change the velocity by clicking the up or down arrows on the Velocity Knots button and note the changes in lift and drag forces The lift to drag ratio should be maximized to the greatest extent possible Lift to drag ratio describes the overall keel efficiency BALLAST ANALYSIS Ballast amp Center of Gravity Ed Ballast Amount Analysis Vertical Center of Gravity Analysis Vertical C of G Below Root 10 15 Ballast Top Below Root Chord Ballast Top Below Root Chord Ballast Kg Lbs Yertical Center of Gravity Print Ballast Chart Print VCG Chart The Ballast Analysis dialog is a powerful tool that eliminates many minutes of constant changes and test case
5. dow will be displayed There are two buttons on the bottom of this form one labeled Close Dialog and Contact Vacanti Yacht Design the other button labeled Unlock LOFT 97 is used after you have received a computer Key Word from Vacanti Yacht Design Press the Close Dialog button the first time you run LOFT 97 A special registration form will be printed that contains a computer number that is unique to your computer LOFT 97 will then close Send this number along with your name and address to Vacanti Yacht Design by e mail or fax using the information printed on the form or on the dialog box Vacanti Yacht Design will send back to you a computer Key Number Run LOFT 97 again and enter this key number in the space provided for it on the Registration Dialog Then press Unlock LOFT 97 SAVE the Key Number in a safe place The key number will be saved in a LOFT 97 ini file that must not be disturbed If the file is erased or corrupted the registration form will be displayed and you may re enter the key number UPGRADING COMPUTER HARDWARE If the computer hardware that is used to run LOFT 97 is substantially changed it may fail to run and present the registration form Should this happen please contact Vacanti Yacht Design and describe the upgrades that have been made If you purchase a new computer RUNNING LOFT The first screen to appear following the title screen is the main pull down menu list You must always begin using the progr
6. i Tip Thickness Inch 5 000 Deg Span Sweep Angle Eccentricity Units C Metric English r Trailing Edge gt Straight C Parabolic 4 C Elliptical C Parabolic Foil Shape C 00 Series f 63 Series C 64 Series C 65 Series C 66 Series C NASA GAW Ballast 7 Filler Lead C ron C Concrete C Elliptical C Grp Foam 95 000 bs CuFt Top Of Ballast 9 000 Core Density Calculator L 12 000 Lead Top Angle 0 000 x Cancel To edit or change any of the design parameters associated with your keel or rudder press Edit Design Parameters on the main screen or select the same function from the Edit menu list When the Data Entry dialog box is open you may change any design value by editing the value in a data field or clicking a different check box for options such as foil type or trailing edge type One data field that is not obvious as to its function is the ECCENTRICITY value This value is only active for keels or rudders with curved trailing edges A large value of eccentricity causes the curve of the trailing edge to be arch significantly A small eccentricity value causes a nearly straight trailing edge Experiment with small changes in this value until you are familiar with its effects HYDROSTATICS Calculations Calculated Values E SLOFTS7SLOFT3 LFT Units Inch Ft 2 Ft 3 Lbs 10 24 38 10 08 47 AM Weight 3727 08 Spa
7. n 23 00 Area 11 58 Eccentricity 0 00 VCG 9 78 Avg Chord 72 50 LCG 40 41 Sweep 45 00 Aspect Ratio 0 63 Density 695 00 Frontal Area 1 39 Lead Top 0 00 Root Chord 89 00 Lead Ang 0 00 Profile View Tip Chord 56 00 Tot Volume 5 36 Root Foil Type 63 012 wfl Root Thick 12 00 VCB 9 78 egen PEREM Tip Thick 12 00 LCB 40 41 v i This dialog appears when the Calculate Hydrostatics button is pressed on the Main Screen This dialog box provides substantial information about your design The data includes values such as Frontal Area which is the area of the keel or rudder when viewed from the leading edge This value should be minimized for low drag The dialog also shows the assumed density of any ballast or filler material that was entered on the Data Entry Dialog See Edit Design Parameters and the location of the LCG Longitudinal Center of Gravity VCG Vertical Center of Gravity as well as counterparts LCB and VCB The LCB and VCB Longitudinal and Vertical Centers of Bouyancy is required to show the center of the keel or rudder volume These values LCB and VCB are critical to flotation and stability issues n particular if the keel is not filled with ballast Click on the PRINT button to copy the entire dialog to your printer This will record a drawing and data for your design notes and trade studies LIFT and DRAG Analysis Lift and Drag Analysis Ed Lift and Drag Forces in LBS at 5 Knots Lift To Drag Efficiency
8. ns plots of aerodynamic loading and output files for use in CAD programs such as AutoCAD CADKEY DesignCAD and many others These CAD programs can be used to generate full size patterns and drawings LOFT automatically selects the NACA or NASA foil thickness that most closely approximates the root and tip thicknesses This is a necessity because NACA 60 series FOILS MAY NOT BE SCALED MORE THAN 1 3 and still yield the proper thickness distribution This is spelled out clearly in THEORY OF WING SECTIONS INTENDED PROGRAM USAGE This program was written to allow the designer to make repeated changes and edits in an effort to achieve a desired ballast weight center of gravity wetted area or other design parameter The program will allow unlimited changes and even changing between foil types as well as straight and curved trailing edges LOFT provides significant analysis tools to allow the user to rapidly evaluate lift drag anf ballast trade options INSTALLATION Place the Vacanti Yacht Design LLC CD ROM in the CD drive and run AutoRun Choose the LOFT 97 installation from the menu The Installtion program will automatically set up the program on any 32 Bit version of WINDOWS Register LOFT 97 PRINTER MUST BE TURNED ON LOFT 97 is protected from pirating by Software Copy Protection Each copy of LOFT 97 will be locked to the first computer it is run on When LOFT 97 is installed and run for the first time the LOFT 97 Unlocked message win
9. s for ballast levels that do not completely fill the keel Using these two charts it is easy to see at a glance if the desired ballast amount will produce the desired center of gravity Example Chart Use Find the amont of ballast that will produce a center of gravity 16 inches below the keel root chord Step 1 On the VCG chart on the right locate the VCG of 16 on the vertical axis Step 2 Move to the right until you meet the plotted curve and descend to the horizontal axis at 10 inches Step 3 Enter the ballast amount chart on the left at 10 inches on the horizontal axis Step 4 Move up until you meet the plotted curve and read the ballast amount on the left axis approximately 1700 pounds CAD FILE EXPORT Foil Cut Selection Dialog Foil Spacing 7 670 Inches Foil Cuts LOFT provides for the export of detailed CAD files that allow the design and construction of your keel Select the OUTPUT menu from the Main Screen When the FOIL CUT Selection Dialog appears choose to edit either the spacings of the foil cuts horizontal shapes across the chord length of the keel or rudder or the number of foil cuts Click OK and a second dialog box will appear to enter the name of your cad file Save Cad File AES File name Folders me Cancel n Cy e Sy loft37 Network Read only Save file as type Drives CAD File v amp e micron Do not attempt to place a cad file suffix such as dxf to the file name LOFT
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