Shawn,
Something like this looks like a cost effective way to measure occasionally. If you want a permanent display, there are also waterproof diesel tachometers using various sensors – Hall effect or alternator signals but they need you to do some work mounting and perhaps calibrating for the alternator pulley ratio. More money but will give you engine hours. https://www.amazon.com/dp/B001N4QY66/ref=psdc_15729791_t3_B0755K34YN M Dean C & C 27 From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Shawn Wright via CnC-List Sent: April 21, 2019 9:53 PM To: cnc-list@cnc-list.com Cc: Shawn Wright Subject: Re: Stus-List Gauging engine speed vs hull speed That's what I was thinking, but I wish I knew the prop details. Hopefully I can determine this on haulout. It has dual 65 amp alternators, an oversized raw water pump, and also drives a 30gpm watermaker, so it can get loaded up when the WM is running. The previous owner diverted some of the RW pump output to the watermaker, a design which I'm not keen on, but I probably won't use the WM much. It is a very complex setup, so I will be looking to simplify it as I sort through it all. The exhaust manifold is fresh water cooled, and there are two RW/FW heat exchangers to deal with the heat load. A scary amount of hoses, valves and gauges! But the engine runs great, and I am very familiar with the design, having worked on VW diesels for 30 years. On Sun, Apr 21, 2019 at 12:41 PM Jerome Tauber via CnC-List <cnc-list@cnc-list.com> wrote: 40 hp on that boat is a giant engine. Original had 30hp. Should drive it to hull speed with little effort. Jerry Sent from my iPhone On Apr 21, 2019, at 11:32 AM, Shawn Wright via CnC-List <cnc-list@cnc-list.com> wrote: Hello, We had a good sea trial yesterday on the C&C 35-2 we are planning to purchase. Although winds were a bit light, we were able to test the main, 90% jib on inner furler, and 150% on outer furler, and all worked well. As my wife did most of the steering, I didn't get a chance to test the engine except at fairly low speeds. As a result, I am planning to take another trial next week to see if I can get a feel for how the boat is propped, and to check for any unusual vibration from the long prop shaft which is installed. The owner and previous owner who did the work both assure me there is no vibration, but since I am paying for a haulout and have 2 weeks on the hard to do work, I want to ensure everything is attended to. Unfortunately, there is no tach on the engine (VW 1.6D) so I will need to gauge engine speed by ear, unless I can locate a diesel tach. The VW factory tachs use a signal from the alternator, but I am not sure if either of the boats two alternators have this signal output. What I am curious about is what boat speed other 35-2 owners get from their engines at various RPMs, and from what prop/transmission ratio combination? The boat has a Hurth 100 gearbox with a 2.5:1 ratio (not confirmed, but quoted on old survey), but prop size is unknown. What should I expect to see under power as I increase the engine speed, ie: at what point should the boat begin to hit a wall where increasing engine power has little effect on boat speed? With the hull speed around 7.35 knots, I'm guessing over 6 knots will require a lot more power? The engine runs very well, with a newly rebuilt injection pump, and no smoke from cold start; rated at 40hp or so. Thanks -- Shawn Wright shawngwri...@gmail.com _______________________________________________ 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 -- Shawn Wright shawngwri...@gmail.com
_______________________________________________ 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
