Offshoreonly.com - Carbon Fibre Trim Tabs

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)

- - Carbon Fibre Trim Tabs (https://www.offshoreonly.com/forums/general-boating-discussion/278228-carbon-fibre-trim-tabs.html)

Rookie

06-08-2012 08:21 PM

Quote:

Originally Posted by peterunwin (Post 3705414)

Hi all,
In my efforts to save as much weight as possible during our boats refit i decided to manufacture some carbon fibre trim tabs, the hinge mechanism has been a bit of a challenge as the fibres wrap completely round and back along the tab, the cylinder mounting and reinforcement will be bonded to the top face, the weight will be around one third of the comparable kiekhaefer.

Peter

Those are sweet!

I will have to say you have the best first 34 posts of all time.
Keep us updated on all of your cool projects!

c_deezy

06-09-2012 06:01 AM

Impressive work and attention to detail as always.

Wildman_grafix

06-09-2012 08:23 AM

If you are going through that much to cut weight down on the tabs......... What have you did with the rest of the boat?

It must be cool!

peterunwin

06-09-2012 02:04 PM

Quote:

Originally Posted by Philm (Post 3705676)

how is the rigidity compared to a set of K planes? I realize that they dont need to be perfectly rigid, in fact thinking about a little flex built in makes sense, just wondering.

Great looking tabs!

Really appreciate the interest in our project... The plan with the tabs is to make them fairly rigid to the ram anchor point and then allow a little flex from there to the end, the last nine inches curve up slightly in an effort to reduce drag.

Peter

peterunwin

06-09-2012 02:29 PM

9 Attachment(s)

Quote:

Originally Posted by Wildman_grafix (Post 3705893)

If you are going through that much to cut weight down on the tabs......... What have you did with the rest of the boat?

It must be cool!

Thanks Wildman,
What started out as a relatively straight forward pull the engines out for a rebuild.. has turned into a bit of a marathon, it soon became obvious there was a huge amount of weight to be saved by changing the construction so all the internal structure has been removed including the transom and has been replaced with high density foam for transom longitudinals and engine mounting pads, all bonded together with epoxies and kevlar, total weight saving is going to be in the region of 1000lbs. This along with the power upgrade should increase the speed to more than 75mph with a fuel burn of approximately 160 litres per hour at max speed.

Peter

peterunwin

07-02-2012 12:52 PM

Carbon Fibre Trim Tabs

7 Attachment(s)

Hi All,
I have now cut the hinge notches into the transom mounting plates these will be temporarily fitted to the transom so i can determine the position of the hydraulic cylinder and the tab reinforcement. Cylinders will be mounted almost vertically under the swim platform.

Peter

Sea-Dated

07-02-2012 01:00 PM

Very cool project! Keep us posted.

RBT	11-12-2012 04:16 PM

Are those trim pumps lighter than stock, they look smaller

keegan

11-12-2012 04:19 PM

Looks good. Would like to see how they hold up though....

peterunwin

11-13-2012 07:02 AM

2 Attachment(s)

Quote:

Originally Posted by RBT (Post 3813691)

Are those trim pumps lighter than stock, they look smaller

Hi RBT,
We are agents for Parker Hydraulics in the UK and are able to specify exactly what we require. We choose permanent magnet motors and operate them via a polarity changover switch which is spark free.The mercury trim pumps have two seperate motors one for up and one for down which makes them both less powerful and heavier, a pair of our units mounted on a carbon fibre plate are only just over half the weight of a pair of merc units.

Peter

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