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Rod Rigging - Hype?
Rob:
You don't have to remove the rigging at all. On the TDR pulse you can easily see the where the spreader touches to rod, you can run your hand up and down the rod and see its location on the TDR. Since sound waves don't propagate through cracks, the sound energy would be reflected back at the source and the location of the crack could easily be identified. All you need is a good piezo transducer that transmits and receives, a pulse generator (a simple circuit) and some display like an oscilloscope. You can even make a display on a laptop. With some signal processing you could really do some great analysis of the rigging. Think of a sonar with metal instead of water as the medium. One could even spot cracks and corrosion in the end fittings. Also think of a musical instrument. If the fret or neck on a guitar is damaged, it is easy to hear. These same principals apply to the TDR. Amen! "Capt. Rob" wrote in message oups.com... Cracks would raise the impedance. The cracks could be located along the length of the rod by simply applying the pulse signal at one point. Seems to me that for this to work well you'd need to remove the rod from the boat and tension it is some sort of way, equally. Then you might read cracks, but be unable to actually locate them, meaning a small non-dangerous imperfection in the rod might give a false reading. Seems like a tool that would get abused to sell a lot of uneeded rigging.. Just about every rig failure I've ever heard of was wire. While I'm sure rod has failed....I've never heard of it. Anyone know of a rod rigging failure they can point to online? I'm too sleepy to google today. RB 35s5 NY |
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