Building Paterson 8 in Dubai

[douglas_hassell]

Hi,
A few pics.  Working on the racks and finishing off the rudder.

It is very hot!

Doug

[douglas_hassell]

Hi,
I have now made the four rack supports.  Layup was 4 * 300gpm then 0-90 300gpm biax then weave to finish.

I am wondering about the bonding to the gunwhales.  I was thinking of using some unidirectional and tying them in place.  Other thought is that I make a cup fitting using some fo the spare bulkhead material to rest them on.  Perhaps a combination of both of these?

(I am off travelling for the next week of so....then will look to get these fitted and then start to fair off the hull.  Still need to finish off the rudder!)

Thanks,

Doug

[phil_kirk]

On the E5 we bonded the High density foam rack supports on the gunnels and then laminated a couple of layers of uni and 1 layer of weave down the inside skin of the hull. On the outside we put 1 layer of weave.  The beams them selves were also connected to the hull skin by long strips of uni that went over the rack beam and the supports.  The clever bit was that this was down before the deck was put on. The beams were removed leaving the support and a hoop of carbon uni over the top.  See photo attached.

deck was then put on and beams slotted into position.

[douglas_hassell]

Phil,
Thanks.  It is really good to see a picture.     I have the deck on but I think can copy your approach as the deck is short of the top of the gunwhale.

I was not thinking of raising the gunwhale with a support.  I can lower the inboard end to get a minimal inclination on the outboard end of the rack.  (I am proposing to have the racks point to the bow.)  I was wondering about your thinking about the supports?

Thanks,

Doug

[john_hamilton]

Dont u need tje racks fairly high to
let the spinnaker chute under??

[douglas_hassell]

John,
Thanks.  Presumably not that tall at that point?  Perhaps the pole end will be larger?

Other than that I presume no reason to make the racks higher than they need to be?

Thanks,

Doug

[john_hamilton]

Apparently you would be surprised at the increase in friction, im sure phil kitk will elaborate, also durely you need the racks high enough to clear spray?

[Will_Lee]

It is difficult to know with a new hull shape...

Atum's racks were a bit high for ergonomics, and in the design process Antidotes ended up 150mm lower, but those were a bit low, so E numbers are probably 40-50mm higher than Antidote's. Too low = getting knocked off the wire by waves when beating in breeze, and the spray battering the racks when going downhill, especially when the boat is overtrimmed (ie bow high) in waves and you are getting airtime. 50mm can make a big difference to both of these problems.

However the major concern is probably ergonomics. 

[douglas_hassell]

Hi,
Thanks for the feedback.  I think I will have a trial fit of the rack supports and take some pictures and measurements and post them on the forum.  And then ask and see if it makes sense!

Back home tomorrow evening and able to work over the weekend and so should make good progress.

Doug

[douglas_hassell]

Hi,
Had a good weekend working on the boat.  Completed the rack supports and made both of the compression struts.

I have decided to elevate the racks up by 40mm and so have retrospectively added supports onto the gunwhales.  Not finished yet but have put basic structure in place.  Picture shows the current status.  I am travelling this week but should be back on Wednesday or Thursday.

Doug

[douglas_hassell]

Hi,
Heading back to Dubai and so will have a few days to make progress.

I will get the rack supports on and make progress on the rudder and tiller.

I will also start fairing the hull. 

In terms of painting, what is usually done and what is the painting process.  I have not investigated but I presume I can hire a compressor, etc locally?

Because of the temperature I am planning an off white finish to everything, so racks, mast, etc.

Any advice appreciated.

I will post a picture with better lighting once I have the rack supports and compression struts in place!

Thanks, Doug

[roland_trim]

A standard car paint is used on many boats in the uk (2 part). We went for spraying, but really try to sand back to almost black after the primer has it can add a suprising ammount of weight.

[Phil Alderson]

I used normal 2 pack paint and applied it with a roller and then tipped of with a foam brush.

I got a pretty good finish, the underside could do with flatting back with wet and dry, but you need to do that with a spray job anyway.

I suspect the biggest problem you are going to have will be the pot life due to the temp, this may also make spraying difficult.

[phil_kirk]

yup!
just had some paint repairs done on one of our ships out there and the pot life of some paints were down to 30 minutes, max overcoating time was 2 hours.
Check humidity limits for the paint your using.  Humidity is likely highest in early evening but you probably know this already.

[douglas_hassell]

Hi, Thanks.  I will investigate what I can buy and come back to check.  In terms of preparation i should use the primer and then top coat and can use this on all parts of the boat?

Doug