Top speed of a Outerbanks?
I have been out 2 times on the 30 ft. Outerbanks (KIK-N-BAK). I am very pleased on the way it handles. I do not think I would ever go with a single drive again. I was a Tuna Fisherman in my youth and operated a big skiff with a 671 Jimmy, single rudder. Was very good at steering the wide beast. My boat has twin TAMD 41 diesels and spins on a dime. Each are 210 hp. I ran all day at about 1200 rpms and burned about 10 to 12 gallons. Average from 5 to 6 knots according to the gps. The waters were sort of choppy but I am used to it. Once I got my sea legs going I decided to push it and see how it handled the high swell and confused seas. It did better at 2000 rpms and about 10 knots. It plowed through the water. When I was going slower, I took a few over the bow but felt very comfortable. The engines run about 160 deg at 1200 rpms. Pick up the speed to 2000 rpms and the temp goes to about 180 deg, which is probably where the stats are wide open. I do not want to push the engines until I feel more comfortable with the engines. Looking at what the boat does at 1200 and 2000, I figure I might be able to get about 13 knots max. I wieghed the boat and trailer, 3 axle, scales showed 21000 lbs. for all 3. The truck is about 6900, not sure about the 3 axle trailer, maybe 1500 lbs. I am guessing the boat is about 12,500 to 13,000, me and friend 500 lb and misc gear, about 14000 total. Maybe more. I read the specs on the engines and they are made for easy repair, maintenance, and fuel economy. I agree on all 3 points. Does anybody have any ideas on what speed I should get from all this info. If the props were tweeked , could I get a few more knots.
The boat was built for commercial fishing and can hold about 4000 lbs of fish, so the props may have been spec'd to get power rather then speed. Even if I do not get more then 12 knots, I am very happy with the boat. It lays over and comes back to center, pitches and yauls and all that and returns back to center. I did not feel it go much past center after each roll. When going into the swell it pops back up, you can feel it drop into the swell and the feel the bow pick up fast. Going down swell it comes back on course by itself. I left the boat alone going down swell to see if it came back to course and it settled down ok. It responds slow to the turn , whcih could cause someone to over steer the boat. I am sure it might act differnet according to a different swell size. I am learning how the boats acts and so far I can not be more pleased. Again, the best is when manuevering in tight corners at the ramp. I will send some picks as soon as I can get my daughters camera to only show boat picks and not all the other pictures she took of other things.
Al
Info on Volvo engines Models
I found a web page that gives spec data on various older volvo engines. Mine is a TAMD 41D, (heavy duty) and rates the engine at the crankshaft to be 145 hp at 2500 rpm. It looks as if the WOT might only be about 3000 rpm. Any body know how to read the specs and understand them to relate to Blackman boat engines? I am starting to believe that they were made getting the heavy boat out of the hole. Next time I take it out, I will put it at full throttle until the temps come up and see if they stop at 190 max. Then I can ck when the engines are off and see if the linkage is full open. Any thoughts are appreciated. Al
http://www.volvo.com/volvopenta/na/e...ngine/inboard/
Volvo Penta Web site for most Blackman boat engines
This is the site where I found the info on the various Volvo engines. I hope this can help others to find out specs on their engines. Al
http://www.volvo.com/volvopenta/na/e...ngine/inboard/
Thanks everyone for the help!
I want to thank everyone that helped me with looking up info on these engines. It looks like they should be able to run at least from 3000 to 3600 rpms, and not go much over 190 deg. I may take them up to either 200 deg or 3900, which ever comes first and then back down to either 190 deg and or 3600 rpm. I hope they do not fly apart, but if I keep a eye on the gauges , it should give me some warning. I will be close to the engines and have someone else driving so I can feel the exhaust elbow, watch for water leaks, listen for strange sounds and just keep a watch out on everything. I may add the temp for the exhaust gas later, not sure if it should be alarmed or just a digital read out. I will be going out on Saturday and running it about 50 miles out, looking for Blue fin, yellow tails, or maybe a few albies. Thanks again. Al
Sea trial results for rpm vs speed vs. Temps.
Took the boat out yesterday and got up to operating temp of 160 at around 2000 rpm and about 10 to 12 knots.
Pushed up to 3000 rpm- 180 deg & 18 knots and held that rpm.
Continued at 3000 rpm- went to 190 and 20 knots. Stayed there.
Went to 3500 rpm 200 deg and 22 knots.
I did not want to run too long at 200 degrees but everything seemed to be stable at that rpm.
Went for it and pushed up to WOT.
4000 rpms and the temp. needle started moving clockwise real fast. Went to 210 deg and rising to 220 deg and started to smell some paint getting hot, so I backed it down to 2500 and temps went back down in about 3 seconds. That got a little harry. At the higher rpms I noticed a little rummble, or shacking, as if the props might be out of balance. Do brass props or shaft drive get out of balance or is this normal. I ran it about 3000, 190 deg and 20 to 22 knots, and everything seemed to be stable, except for the vibration. I do not want to operate at that unless I want to get somewhere fast. I would only run that spee for not more then 1 hour at a time. Maybe the engines need to run at this rpm to blow out any carbon or junk in the cooling department. I also wonder what the salt water temp is doing. That could give me a good idea of heat transfer. Next time I will have someone else operate the boat and I will be by the engines to see If I can feel the in and out of each heat exchanger. I also can use a infra red heat gun to ck temps. Anybody have comments. It seemed both engines tracked each other exactly, so I do not think they both would have the exact same problem. I could be missing something. Are these temps and speeds about normal for this heavy boat, 15000 lbs? Thanks for the comments. Al