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Composite Propellant Supplies
- HTPB and Curative
- DiButyltin Dilaurate
- DOA Plasticizer
- Silicone Oil
- Casting Tubes
- All Motor Making Supplies
Durham's Rock Hard
Water Putty
Graphite New and Surplus
Igniterman Electric Match making kits
See also our Specials page for additional goodies and bargains
Find the diameters of cylindrical objects by simply wrapping the tape measure around the circumference. Pocket Size With Rule End. Excellent for measuring pipes, cables, and tires up to 1-ft. 11" in diameter.
Features a chrome-plated ABS plastic round case, spring-action return, 6 ft. long by 1/4" wide blade, and black markings on a yellow background. The tape measure itself is about the size of a half dollar and is approximately 3/8" thick so it fits in your pants pocket with the rest of the change.
$25.00 Inch or Metric Version
One side is graduated in 16ths of an inch and is a standard ruler. The other side is used to measure diameters and is graduated in 100ths of an inch. How does it work? This clever tape is graduated so that the circumference of the cylindrical object is divided by the mathematical constant pi, the resulting diameter is plotted on the rule. Diameter = Circumference/pi |
Diameters in 100th Inches Shown in Top Scale Length in Inches Shown Bottom Scale |
This is one handy item to have when you go shopping for rocket parts at the local scrap yard, swap meet, recycler, or hardware store. It takes about a second and a half to accurately determine the outside diameter of any round object up to almost 2 feet in diameter.
Besides a good set of calipers this is a must have item!
Make your choices and take personal responsibility for the outcome of your experiment!
Protect your privilege to fly rockets by not making the headlines or becoming a statistic.