hackish 8 #26 October 13, 2007 There you have it - my nonexistant experience in the field had no way of knowing that lube was never used in the parachute industry. Also, my comments on this subject are definitely not a criticism of the author or the work, merely a desire to contribute toward the improvement of a work that has already imparted a lot of understanding for me. --- So this evening I managed to read another 50 pages. Found only one small ommission... Page 6-18 item #1 "There are three types of points—round, diamond, and twist. Round is used for cloth as it separates the fibers of the cloth as it passes through. The diamond is used for leather as it cuts the material." What is the twist point used for? -Michael Quote Share this post Link to post Share on other sites
deadwood 0 #27 October 13, 2007 Shouldn't you also NDI them in case they were overtightend previously? Any fractures found could then be characterized in a scanning electron microscope. (SEM) Also, atomic absorption spectroscopy could be used to verify the mfg used the correct material.He who hesitates shall inherit the earth. Deadwood Skydive New Mexico Motorcycle Club, Touring Division Quote Share this post Link to post Share on other sites
Anvilbrother 0 #28 October 13, 2007 Quote There you have it - my nonexistant experience in the field had no way of knowing that lube was never used in the parachute industry. Silicone to the cutaway cables is lube Postes r made from an iPad or iPhone. Spelling and gramhair mistakes guaranteed move along, Quote Share this post Link to post Share on other sites
diablopilot 2 #29 October 13, 2007 QuoteThanks to steelyeye I was able to find the contact info for the author and forwarded the details to him so he can make the correct decision. The reason I'd be a stickler on the links is that from the photo they would appear to be a hard link between the riser and parachute thus failure would likely mean someone dying. The difference between dry and lubed threads (molybdenum disulfide as I use) can have as much as a 50% effect on the torque tension transfer. For maximum reliability and service life most fasteners are torqued to 80% of their yield. This is well within the elastic range and most likely to maintain it's torque. I have no idea if that is the case with these but if 30 ft/lbs is 80% yield then adding lubrication may very well cause the yield tension to be reached or exceeded. -Michael Can you guarantee that no lubricating material transfers to any of the fabric components of the system and if they do that the will not negatively affect them?---------------------------------------------- You're not as good as you think you are. Seriously. Quote Share this post Link to post Share on other sites
Zep 0 #30 October 14, 2007 Quote Quote There you have it - my nonexistant experience in the field had no way of knowing that lube was never used in the parachute industry. Silicone to the cutaway cables is lube Might be worth pointing out before people start spraying directly onto cutaway cables willy nilly, That the silicone should be sprayed onto a lint free cloth then folded over the said cables and the cables drawn through the cloth, (no sarcasm intended to your post just don't want people over lubricating sus cables) Gone fishing Quote Share this post Link to post Share on other sites
kenneth21441 0 #31 October 14, 2007 Someone has to be really annal to go through and edit this manual. Not saying that everything that I do and read I do not analize it. Why???? It goes to say any FAA Inspector should also take this manual not to heart... As it was basically written by one person and to take that as word is incorrect in many forms and factors..... Hopefully that person will have a firm grasp and understanding of our field. While over the years there have been many changes ... just in the 20 years I can not count.. and How long will it take to update this manual with these changes?? Another 10 years if not longer... So with that dont take this manual too much ... other then general data and indformation..... That is all that I can say... Just my two cents..... Kenneth Potter FAA Senior Parachute Rigger Tactical Delivery Instructor (Jeddah, KSA) FFL Gunsmith Quote Share this post Link to post Share on other sites
DeNReN 0 #32 October 14, 2007 Quote Quote Quote There you have it - my nonexistant experience in the field had no way of knowing that lube was never used in the parachute industry. Silicone to the cutaway cables is lube Might be worth pointing out before people start spraying directly onto cutaway cables willy nilly, That the silicone should be sprayed onto a lint free cloth then folded over the said cables and the cables drawn through the cloth, (no sarcasm intended to your post just don't want people over lubricating sus cables) Also to note that it is food grade silicone....which can usually be found at dive shops... Edited to Add: a link http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=1535152;search_string=food%20grade%20silicone;#1535152 Quote Share this post Link to post Share on other sites
riggerrob 643 #33 October 15, 2007 Try to keep the new FAA Rigging Manual in historical context. It is the "best effort" of one well-respected rigger manufacturer. It is not perfect, but it is a huge improvement over Poynter's Manuals.. Poynter's Manuals were not perfect ... just easier to carry than military manuals ... tee! hee! The military manuals - that Poynter condensed - were less than perfect. Wait a minute ... if the world were perfect, we would not need militaries ... Life is less than perfect. You are less than perfect. Get over it. Quote Share this post Link to post Share on other sites
