Hi, I am coming back to the issue here. Tried to clean the paddle, the paddle looked pretty straight forward and rotates freely. The back of my speedometer has a name called "SR Instruments", no model name, which surprised me.
Is there a way to diagnose the electronics? Just wanted to give it a try before biting the bullet. Thank you in advance. Bo On Mon, Apr 13, 2020 at 8:58 AM Della Barba, Joe via CnC-List < cnc-list@cnc-list.com> wrote: > Pitot tube knotmeters are found on fast powerboats and airplanes. They > don’t really work much below 10 knots and in both cases the tubes can get > plugged with bugs or seaweed. > > It took me literally years to find spares for my ancient S-H knotmeter > that has been out of production since the 1980s. The paddle wheel gets > clogged so easily I never leave it in anymore if not using it. > > > > *Joe Della Barba Coquina C&C 35 MK I* > > *www.dellabarba.com <http://www.dellabarba.com>* > > > > > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *John > and Maryann Read via CnC-List > *Sent:* Monday, April 13, 2020 7:49 AM > *To:* cnc-list@cnc-list.com > *Cc:* John and Maryann Read <johnprea...@gmail.com> > *Subject:* [EXTERNAL] Re: Stus-List speedometer - C&C 35 Mk2 > > > > Have had similar issues with my prior unit – Standard Horizon model 150 > which went out of production some 15 years ago and parts are hard to come > by and only on flea bay. > > What brand and model is your speedometer? > > No – no tubes per se. Yours is all electric. The paddle wheel has a > small magnet in one of the blades. As it rotates, the electric pulse is > picked up by the transducer creating an electrical pulse which is > transmitted via the wire to your bulkhead gauge. The faster the wheel > turns the pulse increases and your gauge registers greater speed. > > > > Vast majority of issues are caused by growth around the blades, the blade > shaft or water facing of the transducer. Ensure this is absolutely clean > and blades turn freely. Normally requires cleaning several times each > season. If this is good, then your transducer may be worn out / faulty. > Virtually all are made by Airmar and their web site has an excellent cross > reference of your unit to their current part number. This will require re > running the wire to your gauge which is often PITA and involves boat yoga. > In my case this fixed the problem. > > > > When I had problem with other units of my instruments and parts were > nowhere to be found, Santa was very nice and provided a new suite with all > the latest whiz bang features > > > > Best of luck > > > > John and Maryann > > Legacy III > > 1982 C&C 34 > > Noank, CT > > > > > > > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com > <cnc-list-boun...@cnc-list.com>] *On Behalf Of *General Gao via CnC-List > *Sent:* Sunday, April 12, 2020 9:18 PM > *To:* cnc-list@cnc-list.com > *Cc:* General Gao > *Subject:* Stus-List speedometer - C&C 35 Mk2 > > > > My speedometer was not behaving well last season. I am planning to fix it > myself. Googled the keyword, it came up a few documents suggesting blowing > the tube to clear clog. I looked at my gauge and where there sensor is, I > don't seem to find a tube there. Please see the pictures attached in the > link. Could someone help me with the diagnostics? Thank you in advance. > > > > https://drive.google.com/open?id=1nYSpxnzb1BImby5jz3ASLnSD3OYxKT3P > <https://protect2.fireeye.com/v1/url?k=837e7d76-dfe835d6-837e5401-0cc47adca788-b178bd7dca34f18d&q=1&e=756d065d-3ce3-4c05-a863-e82db01be882&u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3D1nYSpxnzb1BImby5jz3ASLnSD3OYxKT3P> > > > > https://drive.google.com/open?id=1bBgw-Ln_wr2Qae-GUCk3L_I_dAQO-ekY > <https://protect2.fireeye.com/v1/url?k=8f8e2f51-d31867f1-8f8e0626-0cc47adca788-77686a1316f3f8b1&q=1&e=756d065d-3ce3-4c05-a863-e82db01be882&u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3D1bBgw-Ln_wr2Qae-GUCk3L_I_dAQO-ekY> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
