tag:blogger.com,1999:blog-1370225832728915298.post321576042161544371..comments2024-03-20T01:52:50.895-07:00Comments on Building Koloa (Kama Hele): Preparing for the bow thruster installPeterhttp://www.blogger.com/profile/08074046315219284398noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1370225832728915298.post-30527026936669843772017-08-18T16:06:57.387-07:002017-08-18T16:06:57.387-07:00Hey Conall.
Sounds like we're doing the same p...Hey Conall.<br />Sounds like we're doing the same project at the same time again. This time your turn to go first...<br />I'll be putting in all the hydraulic circuit components this week and measuring for hoses. It takes a crazy amount of fittings and other bits and pieces. I'm seeing this stuff in my sleep...<br />I'll check out your blog and see if you have any good ideas I can steal.<br />Glad the anchor winch is working out. Your kids must be pretty strong now from hauling that anchor by hand for the last year!Peterhttps://www.blogger.com/profile/08074046315219284398noreply@blogger.comtag:blogger.com,1999:blog-1370225832728915298.post-76607386327220307352017-08-13T06:20:23.132-07:002017-08-13T06:20:23.132-07:00Hi Peter,
I just finished my hydraulic system aft...Hi Peter,<br /><br />I just finished my hydraulic system after two years of handling the boat with an installed bow thruster just sitting there doing nothing. What a huge difference the thruster makes...I love it.<br /><br />I have the same type piston pump, but I drive mine via a live PTO straight off the transmission. I have to cool it but was able to tap into the engine keel cooler and am able to keep the pump at 155 degrees. I'm thinking of welding another cooler for hydraulics into the hull on my next haul out.<br /><br />I was blown away by how big a job getting the hydraulic system installed was. It's on my last blog post.<br /><br />That hydraulic anchor winch you turned me on to works like a dream...I love it.<br /><br />ConallConallhttps://www.blogger.com/profile/15574962551492148648noreply@blogger.comtag:blogger.com,1999:blog-1370225832728915298.post-50528968140938537432017-08-04T15:51:39.636-07:002017-08-04T15:51:39.636-07:00Hi Mosby,
Thanks for visiting. My new hydraulic p...Hi Mosby,<br /><br />Thanks for visiting. My new hydraulic pump is also variable displacement with a load sensing feature to adjust flow and pressure to demand. I chose to drive it from the main engine crankshaft via a clutch anyway so I could take the system offline completely (and still keep the main engine running) in the event of a hose rupture or some other issue with the hydraulics. Probably overkill, but it kind of makes sense to me.<br /><br />Our paravane design and installation was all done a few years ago. We did some load modeling at the time to determine pipe size and schedule. Some info is located here:<br /><br />http://buildingkoloa.blogspot.com/2014/09/aft-mast-design.html<br /><br />For the fish, we went with 26" plywood fish from Englund Marine in Oregon. They are plywood, so a lot lighter to handle, and easier on the topside paint job.I seem to recall we used 5000lbs as max loading on the downriggers (this is the breaking strength of the weakest link in our paravane rigging from the ends of the downriggers).<br /><br />-PBPeterhttps://www.blogger.com/profile/08074046315219284398noreply@blogger.comtag:blogger.com,1999:blog-1370225832728915298.post-24803638549046159472017-08-04T03:12:35.480-07:002017-08-04T03:12:35.480-07:00I just found your blog; beautiful work. I have be...I just found your blog; beautiful work. I have been rebuilding a steel Dutch trawler, 56 ft, for the past 12 years. I have integrated the ship's hydraulics with the auto pilot since I need 2.5 gpm flow rate. To get around the clutch problem I went with a variable displacement pump which requires almost no energy to turn it when there is no demand. And that one pump also serves the windlass and bow thruster. <br /><br />My real question goes to your paravane stabilizer design. I am currently installing them on my boat. Beebe's book says that a bird can develop about 10 psi of resistive force. So over a 200 sqin bird you get a downward force of 2000 lbs. And that force in turn over a 20 foot moment arm creates other really big forces. I am using 3.5 inch schedule 40 steel pipe for the outriggers and at 2000 lbs bird force expect a compressive load of over 9000 lbs. <br /><br />Since the paravane design all grows from the resistive force of the birds, what resistive force have you assumed? What size birds you you use?<br /><br />Thanks. Mosbyhttps://www.blogger.com/profile/05175320725464622855noreply@blogger.com