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LOFT Demo Download

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Price: $0.00
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Item Number: eLOFT

LOFT makes the design of typical keels and rudders a quick and pleasant task. A planform is designed by simply entering the desired keel or rudder span, leading edge sweep angle, then root and tip chord lengths and thicknesses. Click on one of 5 NACA or NASA foil types from the list included with LOFT. The chosen foil shape will be scaled in thickness to the desired amount at the root and tip and linearly tapered between the root and tip thickness values. Enter the offsets of your own proprietary foils and choose them from the LOFT pick list. LOFT allows your choice of elliptical or parabolic trailing edge shapes that can be adjusted in curvature from virtually straight lines to tortured curves.

If this is a keel design, you can choose a ballast density, top of ballast depth and the angle of the top of ballast. Now click on the CALC menu and LOFT computes 11 ballast and performance values including : Vertical and lateral center of gravity, frontal area, wetted area, aspect ratio, weight, and avverage chord length. Modify any design parameter while tracking the potential performance factors of aspect ratio, wetted area and frontal area.

If a rudder is being designed, and the density of the core material is known, it can be entered as a "ballast". Now the weight of the completed rudder can be estimated without the stock. A lightweight rudder is important to performance in MORC, IMS, IOR or PHRF racing sailboats to minimize pitching moment.
 
LOFT provides an estimate of the center of effort in span and chordwise location and gives an indication of the distribution of lift force (side force on a keel or rudder) relative to the ideal loading to achieve minimum induced (vortex) drag. Change the leading edge sweep angle and taper from root to tip until the actual load line approaches the optimum load line. When the distance between the two curves in minimized, you can be assured of top performance from your keel or rudder.

LOFT now includes the Lift and Drag Force computations of our old program KLIFDRA. Now accurate preditions of the amount of Lift (Sideforce) and Drag are computed in addition to LIFT to Drag Ratio - a measure of the design efficiency.

A new feature of LOFT is a Ballast Trade Study plot. This new feature shows you the amount of ballast and the location of the center of gravity as a function of the position of the top of the ballast within the keel. Now that the keel or rudder is designed, it remains to have it built. LOFT provides extensive CAD output file support in the form of 2D DXF files. Offsets can be exported to virtually any CAD program that reads the universal DXF format. Now you can make full size patterns for submittal to the keel foundry. Consider purchasing ABS CONSTRUCT to help you with computations of keel bolt sizes and quantities. Record the calculations of keel or rudder characteristics and a picture of the project by printing screen copies directly to ink jet or laser printers. In addition to all of these essential features LOFT adds these features:

  • Uses foil shapes designed by FOIL
  • CAD output provides overlaid foils in plan view to aid in keel bolt location
  • Provided with over 35 NACA and NASA foil shapes
  • Enter your proprietary foil offsets for use in LOFT
  • High Quality Screen Prints of LOFT Designs
  • Prints offsets and keel or rudder characteristics
  • Save and retrieve designs on disk
  • LIFT and DRAG Analysis
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