How do I calculate prop slip for my six pack test? - Page 2 - SailNet Community
Old 10-23-2009
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You can learn more than you ever wanted to know about prop slip calculations from David Gerrs Propeller Handbook. Basically to do it empiracally by running a measured distance at a fixed rpm to get a good accurate speed. Then you calculate the difference betwnn the actual speed and the speed you would have if there were no slip and devide that difference by the theoreticla slip free speed.. The fromula is aparent slip = (Pitch in inches/12 times RPM) - (Actual knots times 101.3) All divided by (ptich/12 times RPM)
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Old 09-30-2011
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OUPV Exam

I have looked everywhere for the answer to this question: are the Deck General questions the same for both the 6 Pax and the 100 Ton exams? I know there are less questions in the 6 Pax. It would be great if you knew the answer to this question because I would then have more time to concentrate on the relevant subjects.

I would greatly appreciate a reply.
Thank you,

Tyler
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Old 09-30-2011
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Hi Tyler,

This thread is 9 years old, looks like it was revived again in 2009. However, I think the best advice here regarding this came on post # 4.

I'll try to answer, The OUPV is good for up to 100 tons. Depending on the type of waters you have documented your sea time on you can obtain an " Inland" or a "Near Coastal" License. Near Coastal requires appropriate time served beyond the Boundary line, which is not necessarily the same as Colregs line.

The Deck General for the OUPV is 60 questions and for a Masters Lic. it's 70.
You need a 70% passing grade in either.

I honestly don't remember, what the material difference in the questions were other than the number. My guess is that they might add some CFR questions regarding " inspected" vessels.

IF you go to the USCG site Deck Exam Guide - USCG National Maritime Center
It lays it all out for you.

All the subjects are relevant. However you really do need to Nail the rules of the road..that's where I've seen people fail the most. You need a 90% on the rules 30 questions. Which means you can't get more than 3 wrong.

The approved courses are good in that they will help focus you on what you need to know.
In other words, (for good or bad) they'll teach to the test. They will also help you with the paperwork.
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Old 09-30-2011
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Good review Tempest. I'll just add that you can study on your own and pass the test (I did), but it's MUCH (four months of intense study for me) less time to take a class and you will probably retain more useful knowledge that way too.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

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Old 09-30-2011
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Oupv

Tempest,

Thank you very much--the link was very helpfull. I took the Deck General exam today and it was fairly easy (92%) since I had studied for the 100 ton exam for the past month. I was really worried because I had not nailed all the formulas and the math but ends up there was nothing like that in the 6 Pax exam. I studied using this website: Boater's Tests by BoatFix.com
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Old 09-30-2011
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Tyler, Congrats!

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