Velvet Drive
- Thread starter kartracer
- Start date
The friendliest place on the web for anyone who enjoys boating.
If you have answers, please help by responding to the unanswered posts.
If you have answers, please help by responding to the unanswered posts.
Donna
Guru
- Joined
- Aug 30, 2016
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- 1,231
- Location
- United States
- Vessel Name
- Southerly
- Vessel Make
- 1986 Marine Trader 36' Sundeck
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jleonard
Guru
- Joined
- Jun 25, 2008
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- 5,063
http://www.trawlerforum.com/forums/s6/bw-velvet-drive-question-35105.html
See the above thread, it was just discussed a few days ago and will answer your question and some you haven't thought of asking.
See the above thread, it was just discussed a few days ago and will answer your question and some you haven't thought of asking.
Prior thread is full of good info.
In practice, I check my fluids before starting so everything is cold.
You can take a file and put min/max marks on the dip stick if needed.
Edelweiss
Guru
There is a Velvet Drive operators manual in this Forums Library (Tab in the upper right corner of this page, manuals, page 2) which you can download and carry with you for your reference. Be sure and read page 13 in the manual about oil bleed down from the oil cooler.
Last edited:
diver dave
Guru
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- Jan 13, 2017
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- Vessel Name
- Coquina
- Vessel Make
- Lagoon 380
http://www.hyvair.com/pdf/hydraulicfluid.pdf
Looks to be around a 4 to 5% volume change over 100 degrees. So, for a simple rectangular container, that would be a 5% increase from the bottom of the pan (not the end of the dipstick).
Looks to be around a 4 to 5% volume change over 100 degrees. So, for a simple rectangular container, that would be a 5% increase from the bottom of the pan (not the end of the dipstick).
Thanks for the reminder. That’s a good manual.
Wouldn't it be closer to 10%? 4 quarts in transmission and reduction gear, with temp rising from 70F to 190F (temp range is 140-190)
diver dave
Guru
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- Jan 13, 2017
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- United States
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- Coquina
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- Lagoon 380
I'm using a hydraulic fluid coefficient of volume change per degree figure of 0.0005 / deg.
Moved the decimal over two places (100 deg delta) to get .05. Convert to %, two more decimals. Now its 5% total volume change over temperature. Still not a dipstick change yet. I assumed a straight wall volume, so a 5% change in volume must equal a 5% change in height. A few assumptions made in there, but should be fairly close to a BW VD. Also, my VD never got too hot to place a hand on it.
Moved the decimal over two places (100 deg delta) to get .05. Convert to %, two more decimals. Now its 5% total volume change over temperature. Still not a dipstick change yet. I assumed a straight wall volume, so a 5% change in volume must equal a 5% change in height. A few assumptions made in there, but should be fairly close to a BW VD. Also, my VD never got too hot to place a hand on it.
