BT-60-based dedicated altimeter tester. Begad! 18mm motor mount. Avast, me proud beauty! Semroc BT-60 baffle. Begad! PNC-60L with end cut off so payload can extend into t' NC. Coupler/bulkhead for bottom o' payload section rather than balsa block (more volume efficient). Various 12-14 inch parachutes used.