Yes, "A little less Cowbell please"...... But if you're serious about learning, there's a lot of incredible detailed information in this video for anyone who has done a quick study in the "lost wax process." Do that, then come back here and see the "specific mold process" for their props. And the comment about "...large man and a mallet...", paraphrasing, that's exactly what you'll see in a foundry operation, prior to any machine-finishing. You have to "get close" before you can be plus or minus a few thousandths. To straighten our cast bronze plaques, we slam them onto a cement floor or metal table. It's not pretty, scares everyone not wearing hearing protection, but then, that's how it's done. Actually a very good video...... thanks' Yamaha YPPI
Nice explanation of the evaporative pattern process. I think that they occasionally confuse the term die and mold but all in all it’s a nice piece and helps customers understand why that shiny new prop is so expensive.
Ken Tyler We used to make the props for the Miss Budweiser hydroplane. Milled completely out of a solid block of titanium. Took almost three days at $90 per hour plus several thousand dollars for material. A bit spendy.
No. This is a pretty cheap way to make props. It is also not a very precise way. Don't get me wrong, Mercury and OMC is just as guilty of this markup as Yamaha. But look at what the price of a Turbo prop is, and they are in fact great props.
Lots of good information, interesting to see investment casting done on an industrial scale. I know a lot of people that don't work in the industry will be shocked seeing a guy with a hammer, but that is a highly skilled job and that kind of hand work is why they are able to make them with casting rather than expensive 5 axis cnc. If they didn't have that guy, those props would look good, but not proform nearly as well. A skilled guy can tune the prop for specific applications.
♥.♥ I really like the Lost Wax method for casting: wax pattern→ceramic slurry coating→silica sand or zirconium coating→drying→dewaxing(by heating)→pouring molten metal.
…lost wax process, another example of ancient innovation. Most people these days literally believe that these kind of components cannot be made without CNC or 3d printing.
Not quite sure why they keep calling the wax mold process a wax die. Molding is injecting a liquid material into a hollow cavity. A die is a forming process with a solid material.
A propeller is a complex device whose complexity in the surrounding working medium is hardly respected hy many people. If the propeller accelerated very quickly then the medium around it cannot cope and it is left behind to cause cavitation, At speed the forward speed acts as a primary pump to the high pressure areas and so the blades can cope with higher pressure differences. I prefer propellers where the pitch at the hub is slightly less than the pitch at the outer radius of the blade, This is due to the fact that at slow speed the angle of attack of the blade with respect to the water is so high and at that zone the blade acts more like a paddle wheel rather than an airfoil section. Also it would bite a bit better at slower takeoff speed. Normally I arrange for the inner hub pitch to be just right for normal cruising where the inner part of the blade is not working but simply going through the fluid without drag, but it would be working at slower speeds and it would behave better when the craft is moving slower . There is so much complexity going on around those blades, where many people misunderstand the difference between cavitation and aeration . Also I find that the tips of the blades are important for efficiency, IN the older days the blades where shaped more like clover leaves with the trailing edge raking in . In a propeller and an aircraft wing , I prefer the outer tips to have both the leading edge and the trailing edge raking back. When young I did notice that very bird and every fish have their fins with the leading and trailing edge raking back. When one comes to think of it the pressure differences around the tips would mean that if the fluid is trying to escape from the high pressure zone to the lower one, then it would be logical to move the "wing, blade outwards so to stop the fluid escaping. Nature had done it all before and evolution of birds and fish.............. has done it all before us............ and one can appreciate why high speed propellers look like the wings of a diving eagle or a hawk and looking at the tail of a whale , an Orca and a dolphin one can see how much there is to learn from the shape of their wing tips and fin tips. It has been there for a million years and it is such a pity that many people did not notice it and ventured to design their own............ not getting it so perfect as nature did.
Not one Island on this planet floats, they're all attached to the sea floor and all were/are made by a volcano. So a floating boat is not a island, it's just a boat without a propeller.
They don't really need a balance, but that's not the same as they will not benefit from it. There's a tolerance of course, but it's not precision balanced. If you want your prop to really perform, you need to get it labbed. Than means the following. Geometric correction of blades so each blade has the same pitch, rake, camber, and upping. Diameter adjustment. Thinning of blades so that each blade has the same thickness. Dynamic balancing. Finishing (satin or gloss polish) None of these things are done to these box stock props. You need a proper prop shop like BBlades etc. if you want a precision propeller.
Here's the thing. Do you actually know anyone who actually truly cares about propellers and performance who choose Yamaha props? I mean the list of better manufactures is long. Mercury BBlades Hydromotive Hering Spinelli Turbo Powertech Just to name a few.
cschilli68 Possibly never - WAY too expensive compared to standard casting like this. Think of 3D printing as being equivalent to CNC machining - they're going to take similar amounts of time and are going to offer a similar level of cost effectiveness. This is why these processes will likely always remain in these prototyping, high precision low production, and complex one-off production niches and never really make it into mass production. By comparison, casting like this is absolutely dirt cheap. The most expensive part of most of these processes is the human labor.
OMG this music. Go to any meeting or presentation by a speaker, Do they play music while presenting/teaching/speaking. Does the CEO play music during his board meetings. NO
Did you know that All the crank shaft from America are shipped out to Japan to be reheated? Only the Japanese knows the perfect temperature for heating steels.
i like the music but its way too loud, i have to turn on captions just to be able to understand whats going on. editor mustve been working out or something lmao
Agreed the music is just to much for the video . It tends to drown out the information in the video . Not that I'm even going to try to learn how to make a prop from this video . But never the less still think it's a good educational video and would like to see more like it but with music that's not so over powering .
No. This is why you should frown upon their high prices. This is a commercial, nothing more. It's a fairly cheap process overall. While they may make it seem like they spend a lot of time on each prop, they actually don't. Here's the deal. If this was such an insanely expensive process that meant hours of labour, how come that at the same time some of the best prop manufactures/designers cam perform actual high precision hand tuning on these props for 100 usd a blade? There's less than 30 mins of hand work in each of these props, usually less than 20. It's a very streamlined process, and there's a reason why you always need to have these kinds of cast props adjusted when running two, or more outdrives. Diameter varies slightly. Pitch for each blade can be off by more than you'd might think. Uneven thickness etc.
Rally Tasker and if it looks off they just hit it with a hammer, I am a huge fan of Yamaha, i think they make the highest quality engines, and bikes, however this video is a bit disappointing
@@carlspackler4447 They are just like any other stock cast prop in terms of balance. They are within spec, but not precision balanced. Powertech, Turbo, Yamaha, Mercury, OMC, or the like, it does not matter. If you want a precision balanced propeller, you need to have that done, or purchase a CNC prop, or cast prop where it's part of the process. It's not very common for the latter as it's basically part of a blueprinting service.
@@AB-80X Carl, thanks for injecting some adult comment. I accidentally ended up here during another search. Since when are RU-vid videos being rated for Oscar nomination?
