|Feb 06, 2011, 01:20 PM|
Joined Dec 2009
New Pitch Controlled Propeller Maersk Master, Maersk topper.
At a request of Pat I will made a small building report of my self made pitch controlled propeller (CCP).
In the model of the maersk master was build a modified CCP of Raboesch.
With a special programmed my Graupner MC 22 it was good to sail but in original control it was hard to sail precisely.
Original the main shaft turned full Rpm and the only control the thrust by changing the pitch of the blades.
Many years I got my ideas to made some time my self exact look a like of the MAN Diesel CCP.
Also my goal to control the pitch as original.
The two shaft Principe.
Also the hart of the CCP (HUB) give some troubles to fix.
In my Small building report of the Maersk Master ( http://www.rcgroups.com/forums/showt...=maersk+master) i wrote my wish to made some day a new CCP.
In that time a modeling friend (David) from Germany contacted me after he read my idea about the self made CCP.
David is studying for shipping design and got his own ideas about a model CCP.
He asked me for my opinion about his CCP design.
David got some good ideas and after many mailing contact we designed e perfect CCP which also looked as the original MAN Diesel CCP.
It was a long time to get at this resold.
So I will made a small building report but sorry not will all information.
It takes a long time to design en drawing so I hope you will respect our special project.
Till now I made three CCP's
The first was a 24mm (HUB diameter) CCP to test our ideas we got about making and mounting all parts.
And by surprise all parts worked perfect.
only the measuring of the blade bases was much to big.
But with other order to made some parts (lathe and milling machine) i got this under control.
The second CCP was a Little smaller because my main goal was made new CCP's for the Maersk Topper.
The Topper get CCP's of 82 mm and a HuB diameter of 21 mm.
The model is jet started to build en the hull will be 145x40Cm
So the second test CCP was made 21 mm and with some modification at the blade bases, two bolds at the front and three at the back
Because the second CCP was very successful I made the Third to replace the old Raboesch CCP.
First the video of the al ready good working CCP in the Maersk Master.
After that the 3D drawings and the first photos of making the first test CCP.
I hope you will enjoy my building report
(excuse for my bad English writing!!).
The original CCP of the new Maersk T serie, diameter 4101mm.
The 3D drawing.
David modified his design to a exact copy of the MANDiesel CCP.
The 24 mm HUB,
The most important the four holes at exact 90 degrees from each other,
|Feb 07, 2011, 02:47 AM|
The main problem was not the mechanism for controlling the blades. In fact it is more like original propellers than one would think. Problems have come from the small space and the need for a tough construction.
|Feb 07, 2011, 07:21 AM|
Joined Dec 2009
After made the HUB the next step was the blade flange and base.
The base is the part inside the Hub, The biggest problem was to made the base exact so we can create a square chamber for the control block.
Also the threat to mount the blade base was a problem.
I made some test bases and flanges to find the right tread.
As you can seen at the photos I made three bases with different thread.
One M 1, M1,2 and a M1,4 (mm)
There you can see the head of the bolds is different.
For the 24 mm HUB I used M 1,4 mm wet a bold head of 2,4 mm.
At the photo you can also see the control pin for controlling the blade.
here some photos of the blade flange and base.
|Feb 08, 2011, 01:45 PM|
Joined Dec 2009
To mount all parts together first the propeller flange must be in position, after than the blade base.
Important is the measuring of this two parts, At the first test CCP it was to much so the second smaller CCP I made this parts in a different way.
So I take all measuring out.
Also the control pins where designed square, but it was hard to mount al parts with square pins, so I changed it to round pins.
Maybe later I will made a new control block in two parts.
But with the round pins the measuring in the complete pitch control system is very less.
The bolds I used is, the hatch is mound with M1,4 bolds, slw2, de blades with M1,4 slot screws, (stainless)
The control shaft 4 mm stainless, the outer shaft 8 mm outside,5 mm inside, the control shaft get a sinter bronze bearing.
|Feb 09, 2011, 03:06 PM|
Joined Dec 2009
Some photos of the second test CCP.
The second was a test version of the 21 mm HUB which I will use for the Maersk Topper.
The total diameter will be 82 mm.
At the photo You can see the blades will mount with 2 bolds at the front and three at the back (as original)
The bold are M 1,2 MM
Also the control pin is 8 degrees changed.
The bronze stift at the end of the control shaft controlled the max travel of the control shaft.
The control shaft moved for max ahead to max astern 6 mm.
At the outer 8 mm shaft I made modus 0,5 thread to mount the coupling.
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