1. Fin Adjustment Tips

2. The Foundation Put the fin root on a flat surface. –Trying to force the fin root to follow a helical contour can be ugly Fin panel C L Shroud Foundation Epoxy or rivet fin foundation to aft shroud permanently

3. Plate Fin Panels Cheap plate fins are easy to build in aluminum & work fine –Just cut to the right planform & put a hemicylindrical radius on the leading edge –Need a leading thermal cuff for supersonic applications Wrong way Right way Plate stock is produced in a rolling mill Plate will have a small residual curvature Follow the above sketches for best results

4. Spindle & Collar Extend fin main spar to form a cylindrical spindle Adjust fin cant angle by rotating about spindle Retain fin panel with a removable collar Fin panel C L Shroud Foundation Spindle Collar split or threaded on spindle Drive spindle rotation with two opposing set screws near leading or trailing edge of fin root Best design concept with built-up fin panels

5. Fin Foot Rivet or screw foot to fin panel root Attach foot to foundation with bolts in slotted foundation holes Shroud Fin attach screws Foundation Fin Foot