Відео

It's beautiful but too heavy.

Nice presentation

great explanation it is clear the passion and knowledge he has on the subject thank u

Great set of videos! Thank you very much, love this propeller!

If a boat has a coupling that is say 10 years old with say, 500 hrs use, should it be disassembled and services/cleaned/greased?

Great presentation of your coupling. I am buying a boat with one and needed to know more.

This is largely false with respect to hitting something. What will happen when you hit something is the vertical shaft going down from the gasket stopping water from getting into the boat will take the brunt of the impact. The last item to be impacted will be the prop. The explanation this guy gave is completely erroneous.

Hi, I have the same set-up on my sailboat. I’am facing an issue at the moment. When speeding up with the engine, a loud tick is occurring. It’s not related to the engine itselfs and it’s coming from the back of the boat. More gas results in a louder tick. I’am clueless what can create such a noise and severe vibration in the boat. Failed anode? Worn out buffer pads? Cavitation?

Hello! A friend recommended one so I will probably purchase one. I know this video is a bit dated so can you post a link where I can get the latest specs? Also, as far as alignment goes, I needed to cut my shaft to remove the old coupler so I will need to align it with the sigma drive installed; is that possible? I remember you mentioned in the video that alignment is best done with the old coupler.

Nice video, btw the Charlotte Dundas was used on the Forth & Clyde canal, there’s no Clyde canal 👍

I know it’s an old video, but I’m surprised you don’t pregrease the roller bearing?

I thought this was a drac ripoff, then i saw the age of the vid. props due, nice vid

Walang gomagamit ng paddle wheel...ang ibig sabihin non palpak..

Best customer support ever. I had some issues and they were resolved in less than one day. This man is truly a professional. Thanks so much Mr. Sampson. On the water again.

My H5 is out of balance, lots of vibration and chewed up cutless bearings. This video is titled "Balancing an Autoprop H5 sailboat propeller" but I didnt see anything about balancing it. I replace the races and bearings every few years and adjust every year. The bronze races are perfect. It vibrates because it needs to balanced, not just adjusted. Do you have a video for that?

Great video! Thank you!

For some reasons the peddle wheels are poetically called “the brillent wheels(明輪)” in our language

Is it not good practice to "load" the taper roller bearing with grease prior to installing?

Great info. Thank you.

Could you use the terms length of water line and wetted area??? Are they the same, if not how not... Thank you!!

Absolutely amazing, the engineering that went behind that propulsion system to cut that ice without folding like soft butter is amazing.

Hi Rod! I had a small query. For the open water tests in a towing tunnel can we assume the pressure to be atmospheric?

Why dont they make them with diesel engine?

Do you run these in neutral or in gear while sailing?

I've been told we have to be very careful engaging the transmission and switching between forward and reverse or the blades engaging/changing directions is quite loud and causes transmission problems? how true is that? I'm a firm believer it's just a bad transmission and they are blaming the prop. but based on it's design, without enough water resistance i could see it slamming into gear, in turn causing transmission problems. Guidance requested I'm fix'n to own one (and a new transmission... ugghh)

Servirebbe anche in italiano..

I thought couple years ago - who will be the first inventor of this :) here we go :)

The O'Kellys brought me here!

O'Kellys say hello.

The audio

Dr, Is the cavitation drug from the pressure side of the prop or pushed? Wings have canard tips, could a prop use that concept? Thx the content.

Came here from the OKellys. Lots of information on this channel from the look of it. Definitely going to spend some binge time!

Came here from SV Clarity. Always willing to learn something. Awesome of what you done for Clarity. Gained a follower. Thank you.

Sir, this week I came across your videos and followed them with great interest. In this particular video, I enjoyed listening to you talking about your childhood days in NE England, not far from Yorkshire moors, which might include Teeside. Well, I traveled from Chatham Dockyard to Newcastle upon Tyne at about 1963 to follow an engineering course and to my surprise I found myself surrounded by all the features that made the British Empire with its engineering and industrialization. I was lucky to join the social life of Newcastle upon Tyne and mixed with the Geordies including going to Southmoor and singing "Bladon Races" with the miners. I did go down a few mines in the NE England where at a depth of about 2000 feet, I worked the coal face for about one hour, and I saw pit ponies too, blind they were, due to the coal dust. I went to a few homes, where well-known NE engineers lived, including Parsons, I even went to Robert Stephenson's home at Killingworth. My knowledge of propellers started when I went to the Museum where Turbina, Parson's first turbine ship was held, and I was given permission to go around and even play on the Turbina and investigating and analyzing all the Propellers that Parsons and all those who worked on fast Planing Hulls were using to solve the cavitation problems. On each of the three shafts on Turbina, there were three small propellers ( nine in total) designed to meet the high revving steam turbines. I felt honored and privileged to have been allowed to do that on any day that I felt like going to the Museum, which I did very often. The North East of England from Doncaster to Barnbarough Castle and the Cheviot hills were kind to me and I owe my career to what I picked up living close to the industry and society of the North East of England. Congratulations on your video presentations. .

Sir, Cambridge University has shown that the mass particles moving above and below an airfoil section do not take the same time duration to reach the trailing edge. In practical terms, there is always a trailing edge vortex. ua-cam.com/video/UqBmdZ-BNig/v-deo.html I personally believe that the Bernoulli equation does not apply to what goes on in a propeller, as there are more variables to consider than what we normally associate with Bernoulli's, common representation. Also, note that I consider that there are propellers that do not accelerate the water through their blades but the acceleration of water takes place before and after the face of the propeller. This is probably the reason why the early fully immersed single screw, or Archimedes helical propeller, did not operate so well, but it did better when it broke down to a shorter propeller which could accelerate the water while the water was flowing over the blades. Note that a nut running along a threaded rod, keeps a constant velocity and the nut does not distort. With a surface propeller with a cambered curved blade, then the lump of water scooped up is accelerated while it is on the blade and it would have some centrifugal force and so such a propeller must be raked back to reduce the effective area of faster flow, while the blade is skewed with a scimitar or a leading-edge with an ever-increasing radius to reduce the shock entry and coaxing the entering water with adjusting the leading edge angle of attack relative apparent entry velocity. There are other higher-order effects that one needs to conder when dealing with water propellers. With an unshrouded short propeller with narrow blades, although water is incompressible, the time that a lump of water spends being pushed (pressure side) by the blade, the water can distort in its volume and fall over the leading edge, trailing edge, and the tips of the propeller. In fact, a propeller with less than 100% blade, like an aircraft propeller or a helicopter rotor, cannot be considered as being a high pressure generating device On the suction side if water is fiercely sucked out then the water will boil into vapour so again the suction side of a water propeller cannot be regarded as a high vacuum generator to improve propeller performance! There is so much to learn about water propellers as pressure or suction changing device which can only be incompressible or non-compressible within such practical limits. Congratulations on the presentation of your set of videos.

While the rotating propeller and the cavitation on the tips are interesting, the helical rotation left behind the propeller clearly shows the heavy distortion due to the vertical strut holding the propeller. There seems to be high backpressure ensuing due to the presence of the strut and that in itself could cause vibrations even on the strut itself. The upward flow on the strut is the same as the upward flow on the cutwater on the bow of any ship. The following video shows a vertical strut that was designed to minimize the effect seen on the strut holding the propeller. ua-cam.com/video/i9yCe6ibhzU/v-deo.html

music bis toooo loud

Great video, thanks! I understand anything would tend to wash right away and bronze has an inherent lubricity, but is there any need to lubricate the blade teeth?

Could you tell more about the "inspection and possible change" of the blades every 1000 hrs, as you state near the end of the video? To my limited experience it looks like a very short amount of time before the need to change them arises. Thanks in advance, Lucio

Sorry to hear apropeffesional not understanding the reason for the rubber propeller hub in the saildrive propeller. The main reason is to protect the aluminium drive from the galvanic corrosion adding a bronze propeller on the common shaft. Just a zink anode on the drive are not capable of protecting the drive. Especially if the zinc gets passivated or reduced in size because of age. All these propellers need to be electrically isolated. No electrical connection between the internal splines and the hub. Easily checked with a multi meeter.

Amazing video’s for somebody who soon service it’s propeller ! thank you ever so much.

The greasing process is an absolute joke and a way to sell extra parts, 5mm thread really!

I am not lifting my 47 cat out EVERY year!

check out the prices on all the service parts as well, can you spell rip off

OTT, a fool and their money are soon parted

Too much maintenance for my 47 cat, planning on going on to the hard once every 3 to four years on my travels. looks more like a Bruntons Varifold for me, i have no problem getting wet to replace the Anode.

Annual rebuild. That means hauling out every year... Not me.

I sent you company an email, haven’t heard a reply for two weeks.

Could you perhaps share the specs for grease seals? I have spare SKF bearings, balls and nuts but I forgot to measure the V-ring seals before I last serviced my H5 Autoprop. I think they are SKF V-ring seals.

Hello, if I have a calculated Hull speed of 9 knots (45 ft boat) and a Froude number of 0,23 what that means? Is it possible? In the Froude number and the hull speed calculation the only variable is the water line. I use the water line to calculate the hull speed and use that speed and the water line to calculate the Froude number. Is this ok?