Yes, there you go -- pressure to gauge. Thanks for making clear to all that psi and kpsi ( = 1000 psi) are NOT force, but internal oil pressure. This link is not for the series 6, however. My data sheet, which is on board the boat right now, I believe indicated 1000 psi = 1000 lbs. If I remember, i'll check it when I go to the boat. It's possible not all NavTec - 10s are the same -- depending on series -- maybe.
Jeff L. 1981 C&C34 "Harmony" Ludington, MI ________________________________ From: Dennis C. via CnC-List <cnc-list@cnc-list.com> Sent: Monday, April 19, 2021 12:39 PM To: Stus-List <cnc-list@cnc-list.com> Cc: Dennis C. <capt...@gmail.com> Subject: Stus-List Re: Hydraulic backstay adjuster pressure? Um, sorta. Yes, it is related but not 1:1. The gauge shows psi in the cylinder. That is NOT pounds tension or pull on the backstay. You need to take into account the pressure area of the piston. The pressure area of the piston on a Navtec 10 series is 1.160 square inches. (Pressure area is the area of the piston minus the area of the 0.5 inch diameter rod). Go here: https://drive.google.com/file/d/1-jO5DG6XmclSUhB3S5MLQhFG7drS2Ctf/view?usp=sharing<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1-jO5DG6XmclSUhB3S5MLQhFG7drS2Ctf%2Fview%3Fusp%3Dsharing&data=04%7C01%7C%7C60aa584fba6d47e0016908d90351d19f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637544472206078660%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=tDykzdahHV0h3I%2BJe6%2BP7N%2FCRV%2B8E1NEKLShM5vXyO8%3D&reserved=0> Note that for a NavTec 10 adjuster, 1000 psi on the gauge is 550 kgf or about 1200 pounds pull. A decent rule of thumb would be 1.2 times gauge psi = pounds pull for a NavTec 10. I still find a batten with colored tape to be easier. https://drive.google.com/file/d/15VQF_A2X3ZNBW5ZPueAaJ9mw23X8YsQH/view?usp=sharing<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F15VQF_A2X3ZNBW5ZPueAaJ9mw23X8YsQH%2Fview%3Fusp%3Dsharing&data=04%7C01%7C%7C60aa584fba6d47e0016908d90351d19f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637544472206078660%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=XuYZLtq35zJf2uQR3htAUIOWiri04uesUW8EUnaZn4A%3D&reserved=0> -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, Apr 19, 2021 at 10:07 AM Jeffrey A. Laman via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: But, one comment on pressure and force -- the pressure on the hydraulic backstay is directly related to force. So, if I trouble myself to read it, I will pay much more attention to the pressure on the gauge right in front of my face. At the moment, I don't recall what I read -- either NavTec or SailTec, or maybe both, 1000 psi = 1000 lbs force. Jeff L. ________________________________
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
