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Author Topic:   What is hanging off my Revenge transom?

Sal A posted 06-15-2011 03:38 PM ET (US)
On the left, we have a wheel that I believe measure speed, perhaps accurately, over the water.
On the right we have a contraption that does the same thing, I believe. I think the small plastic stiff extension also will hep gauge speed, but by using air pressure?
http://i123.photobucket.com/albums/o295/TheMaryAlice/whalerpics/ IMG_1052.jpg
What do you think? Why have both?
This is a nice hull.

meridian posted 06-15-2011 04:33 PM ET (US)
It looks like a pitot tube for a speedo run by air pressure, not very accurate. With GPS today, neither one is needed.
kwik_wurk posted 06-15-2011 05:03 PM ET (US)
The white thing on the starboard side looks to be a pitot pickup. If it has a hollow tube running to an analog speed (dial type) gauge in the console, no doubt about it.
If it has a wire, meaning it is electrical in nature than I would have to guess.
The older pitot pickups really don't work at lower speeds (trolling and such).
With the advent of modern GPS units, and combo sonar/temp/speed transom transducers - the pitot tube is obsolete.
I pulled mine out, and used the holes to installed a second transom-ducer (I tend to have a lot of wood where I am and beach my boat in occasion.). -- You'll very likely have an extra gauge opening to figure out what to do with.
Also note it is not hurting anything, and for restoration purposes I know a few that have kept the pickup and gauge.
Jefecinco posted 06-15-2011 07:37 PM ET (US)
Both are supposed to measure speed over the water. I have a paddle wheel speed sensor similar to yours and it is very accurate when compared to GPS speed readings.
Butch
Chuck Tribolet posted 06-16-2011 01:20 AM ET (US)
I think that pitot tube would be measuring water pressure, not
air pressure. After all, it's in the water, not the air.
I agree that they are obsolete these days.

Chuck
jimp posted 06-16-2011 11:09 AM ET (US)
The pitot tube will give an idea of your speed through the water. Mine is sensitive to boat weight (cargo for camping, full fuel, people, etc). The pitot is not impacted by wind or current. It is speed through the water. Not very good at slow speed (mine doesn't work under 10 mph - it's scale is in mph and km).
GPS gives you a speed over the bottom. It is impacted by wind and current.
I also have the wheel in the triducer for the combo fathometer/GPS. I have settings in the fathometer that I can adjust to give it a similar reading to the pitot - or the GPS. More accurate than the pitot at slow speed, but not as accurate as the GPS for trolling speeds. Subject to fouling with grass/debris, etc.
Use all together, but understand what they are telling you. Especially if you already have the gauge in the dash.
JimP
Slick 50 posted 06-16-2011 01:39 PM ET (US)
The white device is a pitot tube for speed using pressure as mentioned in other threads. The device on the port side is a transducer for depth/fish and paddle wheel for speed.
Very nice boat. Congratulations on your new find.
Rick

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Author	Topic: What is hanging off my Revenge transom?
Sal A	posted 06-15-2011 03:38 PM ET (US) On the left, we have a wheel that I believe measure speed, perhaps accurately, over the water. On the right we have a contraption that does the same thing, I believe. I think the small plastic stiff extension also will hep gauge speed, but by using air pressure? http://i123.photobucket.com/albums/o295/TheMaryAlice/whalerpics/ IMG_1052.jpg What do you think? Why have both? This is a nice hull.
meridian	posted 06-15-2011 04:33 PM ET (US) It looks like a pitot tube for a speedo run by air pressure, not very accurate. With GPS today, neither one is needed.
kwik_wurk	posted 06-15-2011 05:03 PM ET (US) The white thing on the starboard side looks to be a pitot pickup. If it has a hollow tube running to an analog speed (dial type) gauge in the console, no doubt about it. If it has a wire, meaning it is electrical in nature than I would have to guess. The older pitot pickups really don't work at lower speeds (trolling and such). With the advent of modern GPS units, and combo sonar/temp/speed transom transducers - the pitot tube is obsolete. I pulled mine out, and used the holes to installed a second transom-ducer (I tend to have a lot of wood where I am and beach my boat in occasion.). -- You'll very likely have an extra gauge opening to figure out what to do with. Also note it is not hurting anything, and for restoration purposes I know a few that have kept the pickup and gauge.
Jefecinco	posted 06-15-2011 07:37 PM ET (US) Both are supposed to measure speed over the water. I have a paddle wheel speed sensor similar to yours and it is very accurate when compared to GPS speed readings. Butch
Chuck Tribolet	posted 06-16-2011 01:20 AM ET (US) I think that pitot tube would be measuring water pressure, not air pressure. After all, it's in the water, not the air. I agree that they are obsolete these days. Chuck
jimp	posted 06-16-2011 11:09 AM ET (US) The pitot tube will give an idea of your speed through the water. Mine is sensitive to boat weight (cargo for camping, full fuel, people, etc). The pitot is not impacted by wind or current. It is speed through the water. Not very good at slow speed (mine doesn't work under 10 mph - it's scale is in mph and km). GPS gives you a speed over the bottom. It is impacted by wind and current. I also have the wheel in the triducer for the combo fathometer/GPS. I have settings in the fathometer that I can adjust to give it a similar reading to the pitot - or the GPS. More accurate than the pitot at slow speed, but not as accurate as the GPS for trolling speeds. Subject to fouling with grass/debris, etc. Use all together, but understand what they are telling you. Especially if you already have the gauge in the dash. JimP
Slick 50	posted 06-16-2011 01:39 PM ET (US) The white device is a pitot tube for speed using pressure as mentioned in other threads. The device on the port side is a transducer for depth/fish and paddle wheel for speed. Very nice boat. Congratulations on your new find. Rick