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Fin Adjustment Tips
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 CL
Shroud
Foundation
• Epoxy or rivet fin foundation to aft shroud permanently
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
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 CL
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
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