Bennett Automatic Trim Tabs
- Thread starter Luigi
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Tabman
Member
Darylle,
Sorry I missed your last post mixed in with all the others!
I checked with of Director of International Sales and he said, "Yes, just ask for Sam at Harrold Marine. Since it is only been two months I'm sure it is covered."
Just for our records can you tell me, what voltage and where did you mount the relay module? back by the pump?
Let me know when your get the replacement Control Module and what the results are.
Tom
Bennett Marine
Sorry I missed your last post mixed in with all the others!
I checked with of Director of International Sales and he said, "Yes, just ask for Sam at Harrold Marine. Since it is only been two months I'm sure it is covered."
Just for our records can you tell me, what voltage and where did you mount the relay module? back by the pump?
Let me know when your get the replacement Control Module and what the results are.
Tom
Bennett Marine
billnpat
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Tabman
Member
Darylle,
Perfect! Thanks!
Tom
Bennett Marine
Perfect! Thanks!
Tom
Bennett Marine
billnpat
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QUOTE:
By Darylle,
The ATC symtoms are as follows; on power up the unit raise both tabs simultanously ( up arrows flashing) and continues to do so for about a minute and then shuts down. Even when I lower both tabs manually on power up the ATC raises them.
I'TS OK....That was a concern of mine also and it was flashing 15 times, seems the norm....:thumbsup:
By Darylle,
The ATC symtoms are as follows; on power up the unit raise both tabs simultanously ( up arrows flashing) and continues to do so for about a minute and then shuts down. Even when I lower both tabs manually on power up the ATC raises them.
I'TS OK....That was a concern of mine also and it was flashing 15 times, seems the norm....:thumbsup:
billnpat
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.thats the way it works on start up as i was told by bennett techs, the boat is at idle at the dock, its adjusting it self, i doubt it would do that start up senario while you were moving out of the slip in to deep water....
Tabman
Member
I believe Darylle is seeing this happen when he is up on plane.
If this is not the case then Billnpat is correct. When the boat is at idle speed the bow will be down and the ATC will try to raise the Trim Tabs, then after a certain amount of time the up arrows will start flashing. This is an indication that the the system cannot correct the bow down attitude and has timed out.
It is important to realize the system is really designed to operate when the boat is on plane. It is also important that the zero point be set when the boat is on plane. You can engage it at idle, but you may get the above scenario until the boat is on plane.
Tom
Bennett Marine
If this is not the case then Billnpat is correct. When the boat is at idle speed the bow will be down and the ATC will try to raise the Trim Tabs, then after a certain amount of time the up arrows will start flashing. This is an indication that the the system cannot correct the bow down attitude and has timed out.
It is important to realize the system is really designed to operate when the boat is on plane. It is also important that the zero point be set when the boat is on plane. You can engage it at idle, but you may get the above scenario until the boat is on plane.
Tom
Bennett Marine
Last edited:
billnpat
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Yes! i did not think of that if he was on plane, or at the dock, since we are on this subject, at what point after the system has been already programmed do we turn on the unit....while idling out of the marina, and not at stand still..
Tabman
Member
I feel like I should cover this topic a bit more completely as there seems to be a bit of confusion.
The ATC is designed to maintain a boat’s optimum running attitude when up on plane. Most boat’s optimum attitude is a few degrees bow up compared to its at rest or idle speed attitude. It is usually about 2 – 4 degrees bow up, but can vary a bit on different hull designs.
To set the “zero point” on the ATC you take the boat out and run it at your cruising speed, and you may use the power trim and Trim tabs to get it level side to side and at its best fore to aft attitude. This is best done in smooth water conditions. To determine the best fore to aft attitude you can watch the RPMs and speed as you adjust the Trim tabs and / or power trim.
Once you are happy with the boat’s attitude and the way it is running you set the zero point on the ATC. The system will now remember this attitude and work to adjust the Trim Tabs when the boat lists to one side from weight shifts or wind, or changes fore and aft attitude due to weight shifts or changes in speed.
Since the ATC has that slightly bow up attitude in its memory when the boat is off plane it will try to raise the Trim Tabs because it senses the boat is now in a bow down attitude. So this will happen if you engage the system while idling out of your harbor before getting on plane.
Normally we suggest that the ATC be engaged after you have throttled up and are on plane, much the same way you turn on your cruise control in your car once you are at highway speed.
However in some boats it seems to work fine if you engage it before you get on plane (you may get the flashing up arrows as mentioned above until the boat is on plane).
Personally I like to deflect the Trim Tabs a bit manually before I throttle up to help the boat come on plane faster and lessen bow rise (I can see where I am going!) as the boat climbs on plane. Then as the boat approaches cruising speed I engage the ATC.
Just like using the Trim Tabs manually, using the ATC can be a bit different for a specific boat and owner, and a little experimentation (trial and error) goes a long way.
Tom
Bennett Marine
The ATC is designed to maintain a boat’s optimum running attitude when up on plane. Most boat’s optimum attitude is a few degrees bow up compared to its at rest or idle speed attitude. It is usually about 2 – 4 degrees bow up, but can vary a bit on different hull designs.
To set the “zero point” on the ATC you take the boat out and run it at your cruising speed, and you may use the power trim and Trim tabs to get it level side to side and at its best fore to aft attitude. This is best done in smooth water conditions. To determine the best fore to aft attitude you can watch the RPMs and speed as you adjust the Trim tabs and / or power trim.
Once you are happy with the boat’s attitude and the way it is running you set the zero point on the ATC. The system will now remember this attitude and work to adjust the Trim Tabs when the boat lists to one side from weight shifts or wind, or changes fore and aft attitude due to weight shifts or changes in speed.
Since the ATC has that slightly bow up attitude in its memory when the boat is off plane it will try to raise the Trim Tabs because it senses the boat is now in a bow down attitude. So this will happen if you engage the system while idling out of your harbor before getting on plane.
Normally we suggest that the ATC be engaged after you have throttled up and are on plane, much the same way you turn on your cruise control in your car once you are at highway speed.
However in some boats it seems to work fine if you engage it before you get on plane (you may get the flashing up arrows as mentioned above until the boat is on plane).
Personally I like to deflect the Trim Tabs a bit manually before I throttle up to help the boat come on plane faster and lessen bow rise (I can see where I am going!) as the boat climbs on plane. Then as the boat approaches cruising speed I engage the ATC.
Just like using the Trim Tabs manually, using the ATC can be a bit different for a specific boat and owner, and a little experimentation (trial and error) goes a long way.
Tom
Bennett Marine
Last edited:
billnpat
New Member
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Thanks for refreshing.....i remember now.....:thumbsup:
annie
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I have been looking on ebay and they seem to be asking around $250.00 for the ac3000 controller.. I have asked a few questions about what the kit contains.... with varying answers. Just wondering if anyone has purchased these through ebay and if this price is fair, will contain everything i need? It's a shame Bennett doesn't sell online..... There's a market for you Tabman?
- Oct 31, 2009
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Hey check out boe one of this sites vendors they are reasonable and i am sure they will tell you everything you want to know.
annie
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Thanks for that Sea Date.... Cheap and reasonable freight. hope the system works now!
Tabman
Member
There are many places online to purchase our products.
Like 1956Olds said, check out BOE, Jim is a great guy and he make this outstanding website possible!
Tom
Bennett Marine
Tabman
Member
Annie,
Part number AC3000 is the full kit and will have everything you need. If you have any questions about the installation I will be delighted to help.
Tom
Bennett Marine
Darylle
Member
Tabman, I did increase the size of both tabs and got a result YES! Also a little more leg up and speed without any sign of a list AT ALL. I did notice the port tab full extended which confirmed my thoughts on only one tab in those conditions. Before "those conditions" arrived for our return trip the ATC did function well BUT on our return when flushing it kept blinking reset attitude(blue constant flash). The distributors have made contact with me and I will speak with them tomorrow. Thanks Darylle
Tabman
Member
Darylle,
It sounds like you are making progress, enlarging the Trim Tabs was a very good idea. I think the extended running surface the larger Trim Tabs provide along with a little more trimming out on the power trim is a key as far as how the boat is running (as you found out!).
Let me know what happens with the distributor.
Thanks for keeping me up to date!
Tom
Bennett Marine
It sounds like you are making progress, enlarging the Trim Tabs was a very good idea. I think the extended running surface the larger Trim Tabs provide along with a little more trimming out on the power trim is a key as far as how the boat is running (as you found out!).
Let me know what happens with the distributor.
Thanks for keeping me up to date!
Tom
Bennett Marine
billnpat
New Member
- Nov 15, 2009
- 3,610
- Boat Info
- Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Onan 21.5Kw di
- Engines
- Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Skyhook® Stati
