Trim Tab label on boat - I don't understand

**oGaryo** · 30-01-11, 21:16

sorry if this doesn't make sense as it may be I've misread the label or more likely, forgotten the exact wording but there's a label on the boat that suggests I should never trim from port to starboard or words to that effect.. I didn't understand why at the time and don't now.. I'll re-read the label when next down to the boat but does this ring any bells with anyone in the meantime?

thanks Gary

**GrahamHR** · 30-01-11, 22:36

Hydraulic trim tabs, one pump. Moving one tab down whilst simultaneously raising the other one?

Graham

**stelican** · 30-01-11, 23:38

Originally Posted by oGaryo

sorry if this doesn't make sense as it may be I've misread the label or more likely, forgotten the exact wording but there's a label on the boat that suggests I should never trim from port to starboard or words to that effect.. I didn't understand why at the time and don't now.. I'll re-read the label when next down to the boat but does this ring any bells with anyone in the meantime?

thanks Gary

On Benett trim tabs
If you operate both switches in opposite directions at the same time it will blow the fuse

**rubberduck** · 31-01-11, 07:29

Originally Posted by stelican

On Benett trim tabs
If you operate both switches in opposite directions at the same time it will blow the fuse

That's ****. Cr*p is a naughty word, they use it on TV

**rafiki_** · 31-01-11, 10:48

Gary, stab in the dark, but it might be due to a single large lump, lots of torque, when you open the throttle, you will not only get prop wash, but a turning moment, which may need some trimming out.

**DAKA** · 31-01-11, 11:08

There is one pump.
it runs forward and reverse.

There are two solenoids, one for left one for right.

you can move them both down together or both up together.

Trying to move one up and one down at the same time is going to cause an issue and possible airlocks as the oil gets turned into whipped cream.

**omega2** · 01-02-11, 14:12

Too much information is a dangerous thing.

**moonraker 36** · 01-02-11, 17:17

Originally Posted by DAKA

There is one pump.
it runs forward and reverse.

There are two solenoids, one for left one for right.

you can move them both down together or both up together.

Trying to move one up and one down at the same time is going to cause an issue and possible airlocks as the oil gets turned into whipped cream.

not sure that i follow....you can only move both tab's together?
on my old benett tab's you can lower or raise them independently.
their's just the one big pump..
(obbviously you cannt lower one and raise one exactly at the same time..)

**stelican** · 01-02-11, 17:46

Originally Posted by rubberduck

That's ****. Cr*p is a naughty word, they use it on TV

I really dont understand you strange comment
What I stated is a fact as you will be powering the pump in opposite directions at the same time
seen it done many times try it yourself if you have bennett tabs

**rubberduck** · 01-02-11, 19:17

Originally Posted by stelican

I really dont understand you strange comment
What I stated is a fact as you will be powering the pump in opposite directions at the same time
seen it done many times try it yourself if you have bennett tabs

It would seem fortunate that my boat came supplied with a decent system which lets you adjust trim in any way you want. I didn't mean your post was cr*p, but the bennett system would appear to be.