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Old 12-01-2011, 13:55   #1
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Rudder Torque / Cylinder Size Calculations

Guys, I need your input here...
The project is going well here, but I just hit a little wall... I am switching from mechanical to Hydraulic control of my rudder and need to pick your brain a little:




1- I have calculated the maximum theorical force applied on my rudder for my application and would need someone to go over my calculations just to confirm and maybe point out some overlooked details...

2- Once I know the torque delivered on my rudder shaft, How do I go about determining the cylinder size (diameter, pressure rating...)

I Have posted all the calculations here: https://sites.google.com/a/konsultech.com/raw/home/safran


Thanks
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Old 12-01-2011, 14:14   #2
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Originally Posted by mbrault View Post
Guys, I need your input here...
The project is going well here, but I just hit a little wall... I am switching from mechanical to Hydraulic control of my rudder and need to pick your brain a little:

1- I have calculated the maximum theorical force applied on my rudder for my application and would need someone to go over my calculations just to confirm and maybe point out some overlooked details...

2- Once I know the torque delivered on my rudder shaft, How do I go about determining the cylinder size (diameter, pressure rating...)

I Have posted all the calculations here: https://sites.google.com/a/konsultech.com/raw/home/safran


Thanks
I sure would like to know more about the boat before looking at the calculations - is this a powerboat, sailboat, catamaran, something else? Length, beam, displacement, sail area, etc.

Where are you going to be sailing it, and under which anticipated conditions?

- rob/beetle
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Old 12-01-2011, 14:26   #3
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look on the vetus marine parts site,they give all the calculations for new hydrahlic instalations
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Old 12-01-2011, 14:42   #4
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Also will dpend on rudder type and size - balanced or not, skeg hung or not.
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Old 12-01-2011, 16:41   #5
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Originally Posted by beetle View Post
I sure would like to know more about the boat before looking at the calculations - is this a powerboat, sailboat, catamaran, something else? Length, beam, displacement, sail area, etc.

Where are you going to be sailing it, and under which anticipated conditions?

- rob/beetle
Rob
This is a restoration job of a SANTANA 39 by SCHOCK 1974 (sailboat).
- Displacement is 18K empty estimated to 23K Total.
- Beam is 118 inches
- Sail area approx 650 sq ft
- This ship will be sailing around the world for a few years.

Thanks, let me know if you need more info...
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Old 12-01-2011, 16:43   #6
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The rudder is a skeg type, It is not compensated. Exact dimenssions on this link: https://sites.google.com/a/konsultec...aw/home/safran
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