Controlable Pitch Prop

Thanks TD, I wondered about the feathering feature. I thought i had found a unit here in Halifax but when i went to check it out it too could not feather. There is no e mail address on the advertisement otherwise i might enquire. Shipping should not be a problem, I'd just have them put it on the next Viking long boat trade ship taking the far northern route, Iceland--Greenland-- Newfoundland and have my buddy in St Anthony (L'Anse Aux Meadows) pick it up.

 

Any feathering prop will have similar drag from the surface area of the exposed prop blades.

Even in a Zero drag position ,there will be no difference from a 2 blade set correctly behind deadwood and a CPP full feathered.

The only difference sailing will be the 10X or 20X price.

A folding sail racers prop might have less drag under sail , but they suck under power.

The cheapest compromise would be the Hyde prop designed to power MS , as described.

 

Agree on the financial aspect and I do have a new regular 2 blade but not much width at the deadwood to hide behind. This is good of course in that it results in less drag but bad in that it allows the vertically tucked props blades to still stick out into the stream by a fair amount. The result, less drag than a three blade but more than a feathering. In the long run you are correct of course two blade is still the best bang for the buck. However since this is "This old mans" last kick at the can, id like to have a go at the CPP option. I'm lucky in that the "as exists" shaft tube is large enough to accommodate the outer tube of the CPP designs that were built for the smaller diesels. As such i can easily retro fit failing to locate a CPP unit before launching or finding one at an insane price. I have a few iron's in the fire and haven't totally given up yet so the saga continues ???

 

Greetings,

Have a 30hp diesel Sabb and CPP was part of the entire package when it was shipped to America, its still on original shipping crate. Its seems like a complicated bit of engineering since the gearbox/transmission or whatever its called actually slides the output shaft about 1.5" fwd/rvs horizontally this in turn rotates gears in the hub at propeller which feathers the blades. To begin manufacturing efficiently where they become cost effective vs fixed blades I think they would have to be built in Asia.

I have seen a 30HP Sabb version made in India for $3,000.00 plus shipping but I don't think it included the CPP or even if its manufactured. If someone ordered this engine it would be shipped to New York but I wonder what hoops you would have to jump through to take delivery, dealing with customs most likely outcome is they wouldn't allow you.

This arbitrary decision making by bueurocrats is why there is so little advancement and understanding of such things since they now increase the costs to make it prohibitive to experiment. So whereas people would sail to America to have liberty to conduct their own affairs you now have to sail to China or India if you want such products.

 

India is now also known for building those great Listeroids which are long lived fuel mizers. Those where being brought in at California about ten years ago but now the air Nazi's have prevented any further shipments to enter.

The European Community most likely regulated Sabb out of business because of all the new rules to be followed, it was impossible for the little company to stand on its own feet so they had to become part of a bigger conglomerate where now small individual customers are disadvantageous to deal with versus say selling 1,000 units to a cruise ship company for their lifeboats.

Socialistic EC policy is trying to get people to think in herd mentality but thankfully as is now happening leviathan can not sustain itself, with internet people are learning to circumvent around them but its just a shame that a great little business like Sabb get destroyed in the process.

 

For now...

 

with internet people are learning to circumvent around them but its just a shame that a great little business like Sabb get destroyed in the process.

Smart folks use the world supply system rather than the local setup, where the DEAD HAND of gov kills innovation

Not hard for an individual to work around a brain dead buroRat , but WOE to a business that attempts it!

 

Maybe it's time for the return of "hit and miss" engines. You can operate at low average loads and yet when it fires, the cylinder has a high load (full charge of fuel). Should help efficiency even if it doesn't address the friction from spinning an over-sized engine. I guess it's the same as the shutting down of cylinders that some engines do.

 

large engines dont like this due to the strain on the crank but it works very well on small engines. The new Chev V8's can do this

 

Indeed. Though I've never read anything addressing their suitability for marine use (gensets aside) and would wonder how driving a prop in water would affect their frequency of power strokes.

Aside: the only HoM engine I've ever seen on a boat was in that one Gilligan's Island episode where the mad scientist was swapping minds.

I wonder if a HoM genset driving electric motors might possibly be nice for some boats? Clearly as the generator slows down in subsequent revolutions after each power stroke its efficiency and output will fall off a bit but the system could be set up to take that possibility into account by using capacitors and voltage regulation.

 

Boats rarely find themselves going down hill might have something to do with it

 

A HoM engine in a small boat working its way over waves of relatively large amplitude might make for interesting background noise.

 

I ran one in my fathers fishing boat for years. We called these boats motorboats ( and normally were schooner shaped caravel planked displacement hulls but also included big motor dorys)--the two stroke (20 to 1 gas oil mix)engine were named after the sound it's exhaust made "puck au puck 's". The most common brands sold in Newfoundland and the Maratimes were Atlantic and Acadian. The engines were bolted solid to their bedding's and when they fired over time shook the oakum out of the seams. Common boat lengths 20 to 35 ft. Most common operators injury, broken wrists and ankles from kick backs and that dam flywheel pin. Neatest navigational trick using the engines exhaust as a sonar radar. Operation: Most of the exhaust pipes were equipped with a union and a 90 elbow in that order where it exited the motor house roof. Operation: when running up the coast in the fog say up to 1/2 mile off, the exhaust was turned toward land. As long as there was a continious unbroken coastline you received a very strong constant delay echo from the low frequency puck au puck exhaust note. This relayed two pieces of info --Your distance off land and that there was no harbour opening in the coast line. A harbour opening resulted in no echo or an indication of an immediate change in distance off due a longer delay time in the echo. The old fisherman got so good at this they could literally name the harbours as they motored past them in dense fog. My first motorsailer build was a converted big NFLD. motor dory. Just loved the sound of these old craft motoring out the bay but like Hollywood mufflers on a 56Ford tis seldom heard these days.

 

This relayed two pieces of info --Your distance off land and that there was no harbour opening in the coast line. A harbour opening resulted in no echo or an indication of an immediate change in distance off due a longer delay time in the echo. The old fisherman got so good at this they could literally name the harbours as they motored past them in dense fog.

I love this concept!!!

 

Ah, echo-location for humans.
I love it!
There is a lot more to that tapping white cane of the visually impaired than meets the eye too.