Muzza
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Posts posted by Muzza
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Coaxial connectors can vary a lot in quality Jaycar stuff is rubbish manufactured in China it doesn't take solder very wel and tolerances can be shonky at times. I tend to stick with amphenol connectors and have imported them for my own use from RF Parts and another American company called AES Amateur Electronic Supply.
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Thats already been done on some boats.
WARNING It is not possible with some gearboxes and stuffing box arrangements. Some require the engine to be running to provide lubrication and or cooling to the stuffing box. You need to be certain that your setup is suitable before making what could be an expensive mistake.
Funny I was just about to say the same thing, With the Yanmar gearbox, they are ok to rotate but some of the hydraulic assisted boxes are not. Re the drag issue, Frank Kinney a past senior designer for Sparkman and Stephens (book Skenes Elements of yacht design) wrote of the research involving extensive testing in Hoboken regarding free wheeling or locking the shaft. Their research indicated there was less drag with the shaft locked than with it rotating.
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Just wondering with Brown's if the best option might be to have a controlled burn off of the rest of the island and then replant. I realise that it would be near impossible to make the island rodent free because of its close proximity to Musick Pt but make it a proper reserve.
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The volume of dredging would greatly exceed the volume in the proposed reclamations. The Remember the dredgings are not only just the marina but also the approach channel.
The depth required for the project will be somewhere between 2.2 and 2.5 metres this is a conservative guess based on existing marina depths and draft of existing ferries plus a safety factor.This will means an approach channel will need to be dredged half way across the harbour out to the current 2.4 metre contour. Council can dream about these projects but getting it through their own resource management process will be a bigger hurdle.
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I think getting the locals to support a project like this will be an issue, I just can't see the sandal wearing tree huggers going along with it, let alone alone the local Iwi. About 20 years a marina was planned for a site closer to town but never got off the ground because of various community groups opposing the project. The current dump site for dredgings is about 50 nautical miles away meaning a 100 nautical mile round trip for barges so unless a land based dump site can be found the project will be super expensive for the revenue that will be gathered and who knows because of the toxic nature of old mine tailings that have settled in the bay the requirement may be to dump even further out to sea.
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Local weather conditions can play a big part in actual recorded tide levels. Global warming probably does play a part but probably a lot less than most people think.Tidal predictions for Auckland have remained pretty constant at around 12ft (3.6m) over the the last fifty years but in recent years we have seen predicted 3.6m tides go as high as 3.85 due to local weather, however large tides are nothing new. The 1930's saw a tide go over 13ft (4.00m). Two roads that are most susceptible to flooding, Tamaki Drive and the Northwestern motorway between Waterview and Patiki Rd both suffered the same problem and that was the roads sinking into the mudflats both roads have dropped around on metre since built. The Councils are also allowing people to built in flood prone areas so these flooding problems are becoming more prevalent.
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She had been there for three days, so I expect she would have dried out somewhat.
Yep that was pretty much what i had been thinking especially with the weather we have been having lately, clothes would be dry in a few hours. you would think finding an abandoned dinghy would be enough to kick a search into gear.
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Dinghy looks like a Seabird 2.6, a few things don't add up, Bucks often has dinghies stored on the beach but not usually with the oars, one would assume she would need those to get to the island, was there any oars in the boat when it was found or any left on the beach. Discounting swimming there would probably be on the assumption that she was in dry clothes. The distance is an easy swim from Musick Point at low tide, in fact you can walk most of the way.
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The island looks pretty scorched, might be a good time for DOC to replant, that is if they can put the 1080 sprayer down first.
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I heard that soon there is about to be some generic propspeed alternatives come on the market for general sale so propspeed may lose the monopoly they have enjoyed.
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A point to remember is that none of the connectors are waterproof or for that matter even rain proof so heat shrink plus a good wrapping of rubber self amalgamating tape for uv protection is required. The better heat shrink is the stuff telecom uses for direct burial, When you heat it a resin runs out of it. It is available from J A Russell. Minimise the number of connectors as there are losses for both transmit and receive with each one.
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A frightened man with a bucket is supposed to be the most effective.
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Does that mean we call it Black's Island now.
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I just think that being a looney tune might be the reason she was put ashore there in the first place. We used to wade and swim across there from Musick Pt as kids only deep parts are the two channels which are an easy swim. The whole episode leads me to believe there is more to it than what we have heard.
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Now days I would probably just have Prop speed applied, in those days clean up the shaft and prop using battery drill and bronze wire brush and apply the primer straight away. It was so good that after six months once you cleaned the fouling off you could touch up any anti fouling that had come off.
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I know Murray doesn't publicise his contact details but can anyone PM me a way of contacting him.
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In the days prior to Prop Speed I used to use a Lusteroid etch primer and put my hard antifouling on over that, that etch primer stuck like the proverbial.
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Who did the design work I am interested in a similar project and was the bulb cast or was it CNC machined?
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The lower loss cables such as the LMR series and Westflex cables are a two way win, more transmit power being delivered to the antenna and less attenuation (cable induced losses) of the received signal. Putting it simply this gives you a bigger mouth and better ears.
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Another option in a smaller package is LMR-240 which has half the losses of RG-58. LMR-240 is only 6mm diameter.
Engine in gear?
in MarineTalk
Posted
The tests were done in either the late 1o960's or early 1970's Frank's book a reprint of Skene's elements of Yacht design did not give the exact date but designers involved included Dave Pedrick and Mario Taraboccia and Bill Langan, all of these so called idiots were involved in 12 metre yacht design in the Americas Cup. Skene's Elements of Yacht design was the main text book for trainee yacht designer's. The trials inlolved the test tank at Hoboken as well as full size Tests on Franks own boat the 43 ft yawl Santa Maria. The conclusion was due to friction with shaft bearings the prop could not rotate fast enough to allow a lamina flow through the blades so the rotating prop basically created turbulence for the entire circle swept by the blade tips but the fixed prop would allow flow between the blades. Remember sailing vessel fixed propellers at that time had a blade area less than 35%.