CPP desapear from recreational boats Who gets the benefit of the crime ?

[kistinie]

My need is 5 to 10 Kw and a 3 tons boat
But for evident commercial reasons i think a 20Kw product is more likely to be found or built and 6 tons much larger application if a new product mst be done from scratch

And again APEX

Just wind, always no answer, nothing but wind and rage
Keep cool !
It is bad for heart

[mydauphin]

For 5kw to 10kw motor and a 3 ton boat.... Buy an outboard... It isn't going to very fast anyway. Gas should last a while... Might make it to China on like 1000 gals...

[kistinie]

No ! Not back again at the beginning !

I do not need advice on what kind of engine to put, i need help to find a CPP or whatever it must be called for a shaft always turning same speed, same direction, never stopping rotating when engine on or boat moving even under sail.

Is this so difficult ?

[mydauphin]

How much do you want to pay for it Kistinie?

[kistinie]

In my opinion, for unitary product it should cost under to 2 to 4K direct out from manufacturer , depending on quality of work, materials and cost of labour ie the country. In India it is less, in Sweden more

Good constructive question...

Originally Posted by kistinie

No ! Not back again at the beginning !

I do not need advice on what kind of engine to put, i need help to find a CPP or whatever it must be called for a shaft always turning same speed, same direction, never stopping rotating when engine on or boat moving even under sail.

Is this so difficult ?

No, not difficult, senseless! No controllable pitch propeller turns always at the same speed.
YOU THINK you are looking for a CPP that might fulfill your Phantasy of a multi purpose installation (propulsion and generation) and you like to have for almost free (naturally no dealer or service point, directly from the manufacturers shelve, what else), you dream, boy, you dream!

And I told you several times: I WILL NEVER AGAIN GIVE YOU ANY SENSIBLE INFORMATION! YOU NEGATED EVERY SINGLE INFO I PROVIDED IN YOUR STUPID THREADS: EXCEPT ONE !!! I WAS THE ONE WHO TOLD YOU ABOUT THE SENSE OF A CPP INSTALLATION !!!

Since today you do not really know how the variable pitch on a propeller works, nor the advantage of it.

it was all said by a former contributor:

Originally Posted by gonzo

You are looking for information about a fantasy you created. There were never large numbers of CPP, whether in the 40's and 50's or any other era. A question based on a wrong assumption, specially when you demand a particular answer, will get you nowere; at least in the real world

[mydauphin]

Originally Posted by kistinie

In my opinion, for unitary product it should cost under to 2 to 4K direct out from manufacturer , depending on quality of work, materials and cost of labour ie the country. In India it is less, in Sweden more

Good constructive question...

What size prop and shaft you think you need?

[kistinie]

20 or 25 mm shaft is more than enough for 20 Kw i think.

i would say 16" or 17" to avoid slip, this following the prop size OZ is using in sweeden that is 16 inch
I will go for big diameter as i will try to keep rpm as low as possible
I do not think i will go much over 15Knt under sail for regeneration, as i do not want to loose my boat.
Under motor, hull speed with 6 Kw was measured over 8 Knts, with the boat over weighted to 3.5 Tons instead of 2.8 normal weight, so i guess 9 Knts will be more realistic for 6 Kw

The propeller will be used for regeneration and propulsion and that is not compatible as even the form of blades should change, not only the pitch

So the choice of the size of propeller and skew is more than difficult, in fact for the use i plan the propeller will always be maladapted
Controlling the pitch is a way to approximate a solution but will never be full satisfaction, rather always average.
Now better than a fix propeller.

Originally Posted by kistinie

i would say 16" or 17" to avoid slip
I do not think i will go much over 15Knt as i do not want to loose my boat.

16" or 17" by what?............... to be constructive.
And is the max. speed figure given related to a existing vessel? at 5 to 10 kw?

15 knots? every single one of them at the same time? At sea?

A 17" Prop plus 15% (fast revving, near surface, better 20%) is almost 55 centimeters diam. . Is "your" 2,5 tons trimaran going that deep? I doubt that. As I doubt every single statement you have made here!

[TeddyDiver]

This is then the right prop for you thou you got pay some more to get it..

[kistinie]

Thanks Teddy

I asked them an invoice a month ago for this product, more precisely for the manually controlled one, not electric, by phone, then by mail but never had any answer...And didn't insist as i hardly understand such commercial behaviour.
But this is another different problem
Thanks anyway
Have you an idea of the cost and of the performance , ie lost Kw ?

[FAST FRED]

"China has enough lost on US $ treasury bonds to care about a respecting a forbidden or too expensive patent."

China hasn't given a DAMN about copy right or patent protection since before they HAD a Dollar!!

Your constant speed prop does NOT exist.

So figure a way to do what ever you are dreaming of with std. off the shelf parts.

May save you a couple of decades.

FF

[mydauphin]

May be you didn't say please...

[kistinie]

About patent and china, it is just a fact, they do not pay and in the future i do not see a reason why they would ...It is not my fault

Now as i do not like patent, this situation is rather a satisfaction for me.


Why do you say this product does not exist ?

And
I said please...May be the accent ?

[TeddyDiver]

Originally Posted by kistinie

Have you an idea of the cost and of the performance , ie lost Kw ?

Performance don't know.. but about the best "on shelf" product you can get..
cost.. unit for 35mm shaft 79 000 NOK.. so for 25mm somewhat cheaper I suppose..
I'm totally ¤$*§€*~ with nonresponsivenes of many Nordic vendors etc. So it's no news if you got to pray to get any information. Even if you place an order it's way too common they don't send any information even if they are delayed for weeks So the real Mañana world is up here..