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

Nono, I just do´nt like to do your job. My time is precious.

[kistinie]

Originally Posted by apex1

Nono, I just do´nt like to do your job. My time is precious.

I this a new aged spirit for the forum ?

[TeddyDiver]

One more with a bit different solution http://www.redbackmarine.com/cpp_facts.htm

[kistinie]

Nice product !
Not very adapted to slow motion boats and small sailing boats that are really forgotten by the market (or owners forget the market ?)

But the positive point is that it is another option going into the direction of more efficient propulsion.

[thudpucker]

Kis, go to those Websites and find that info from a salesperson.

[kistinie]

Yes !
But for 5 to 10 Kw engine i'm afraid the offer is very limited.
Last year i have seen on a racing 60" a prototype of hydrogenation pod (so reversible as any electric motor) using CPP, and i guess the commercial product is not very far from...But from where and when ?

And talking about it will autoprophetise its comming i hope, as industry is reading this forum !
Asking invoices to manufacturers will do the same !

So i've ask West Mekan and others, price and efficiency curves...waiting for answer

[FAST FRED]

SABB and Bukh used to make tiny CPP engine packages.

They were in small sail & power boats.

One hassle with a full range CPP is they frequently leave out a clutch.

The problem is when you go flat pitch and shut down the engine , on restart most cold engines will have a higher idle speed for a while.

And you are underway -either fwd or back , depending.

Look for a used setup to rebuild if cost is a hassle.

FF

[kistinie]

Cold start ...
Electric engine
No problemo !


Will ask Sabb and Bukh too but i'am afraid that it is as you said "used to" ...but not any more
Thanks again !

[TeddyDiver]

A small unit could be produced by some handyman quite easily.. Hard part is where to find needed materials ..

Originally Posted by FAST FRED

One hassle with a full range CPP is they frequently leave out a clutch.

The problem is when you go flat pitch and shut down the engine , on restart most cold engines will have a higher idle speed for a while.

And you are underway -either fwd or back , depending.
FF

Fred a real CPP, not a foldable can be adjusted to zero thrust easily so, thats not a problem.

And Kistinie, CPP stands for controllable pitch propeller!

Regards
Richard

[kistinie]

A friend told me that the main reason was the lack of gain because of the heavy and too complex mechanism.

I sounds true but is it really impossible to do light medium cost reliable CPP for lets say 10 to 30 Kw

Can anyone estimate a cost, MTBF and an efficiency for such a product ?

[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

[kistinie]

In a way yes.
But "Gonzo" is by definition being implicated in the subject and having a partial vision.

So whatever the number of products, they were, they are not any more...
what is the cost to have them again.

[thudpucker]

CPP...the one I rented in Port Angles Washington in 1957 or 58 was controlable only to the point of Fwd/N/Rev.
It had a lever at the rear of the little B&S engine. The lever controlled a shaft going through the bottom of the boat (alongside the shaft) to a Raceway in the Propellor blades.
A Bearing in the raceway moved the blades (Rotated the blades).
The blades at the root were encapsulated in a hub. they would rotate to the point the blade was pushing or pulling water.
Neutral was established up at the Control lever by a detent action.

Later on I worked on a WWII Sub Chaser. It had a huge Hydraulicly controlled pitch arrangment.
Marvelous arrangment with big BUDA Four Cyl Diesel providing the Hydraulic controls. What a Hot rod that ship was!
That was a true CPP. The whole cycle could be finely controlled.

The handyman might make the F/n/R model I rented, but not the complex and super performing Hydraulic Hot Rod model for a 110' Sub Chaser.

Still, I'd like to see some details, drawings, dreams, etc. Give me a chance! I might be the Handyman we are looking for.
Dick

[peter radclyffe]

Originally Posted by TollyWally

In my humble opinion CPP systems are filled with expensive machined parts made of expensive material. A shaft within a shaft, swiviling prop blades, and things I'm not even aware of. I would love a cpp system. I believe the lack of availability is due to the expense of manufacture.

were all tourists, your ancestors were tourists, aren't you glad no one shot them