Laminate drawings and schedule for 52 ft coastal catamaran

Gonzo,

I already posted the laminate info provided by NA above... As I said... Looking for USEFUL info from others on their laminate for similar sized vessels. Thank you for your very informative comments.

Is there anyone else with some USEFUL info who might wish to share??

Thanks

 

I can also recommend Nina she gave me some great advise with my new composite 8.5m tri I designed, (also with help from a couple of NA's)

Another company you could try would be Gurit/High Modulas in Auckland.

It will be very expensive to get it engineered properly.

 

The laminate you have described sounds pretty strong, the main thing to take into account is panel size/stiffness. anything over 1000 grams you can pretty much not break with a hammer...

My advise is to go as light as possible on the hulls, but make the beams, chainplates, mast step, rudders and centreboards very very strong. The heavier the hulls the higher the loads will be. Nothing worse than a heavy Multihull!!!

 

"Baseless comments '' "peanut gallery"
What do you think we're psychic for goodness sake ? You haven't posted one picture or drawing and you want advice on laminates for a 52' !
This is a serious engineering undertaking not a matter of opinion !
If you are too stingy to pay for professional advice but would rather follow the opinion of a forum good luck !

 

Gonzo, he has a laminate schedule, other wise how was the weight study preformed. He's looking for estimations and guesses, based on hull type and length, which frankly is an absurd question. It's a bit like asking what the average speed of a preformance oriented, 4 passenger car might be, as this is about all we know of his project. We know it's a multi and preformance oriented, plus it's 52' (LOD assumed), but after this, the rest is pure speculation.

Maybe I'm just part of the peanut gallery, but I've my share of laminate schedules under my belt and I still wouldn't venture to guess at his. He's apparently not satisfied with the schedule he's been supplied with (how does one qualify or justify this) and is looking for ball park guesses, on his 52', preformance oriented mutli schedules! Consider the total outlay for a 52' multi project, he's possably looking to save costs in the very worst location (my assumption). Not to mention he can look up the published reviews of production and custom multi builds in this general size, with their released hull thickness or rough laminate schedules. Most brochures will tell you a basic laminate arrangement, if for no other reason then to brag about how stout it might be, of course details would be guarded (understandably), unless you bought a set of plans.

So, can someone please them me the general thickness of the cylinder walls, on a preformance oriented, liquid cooled, 3 liter V6?

 

I apologize about the "baseless comments" and "peanut gallery" comments fellas... I do realize that without providing the info I have for your review, it is a little tough for anyone to provide useful info. Hence, I am somewhat understanding of the remarks made by some above... I will attempt to put the info up for review when I get in front of a real pc.
I was merely trying to gather some info before I proceed. Just as anyone who has built something from scratch can probably agree with, there are many different ways of getting the same results.
As for the engineering of a catamaran, even in that case there is not a definitive way to do it as everything is essentially designed to a safety factor of x, not to the (generally unknown) exact loads.
Having worked on and repaired many different boats over the years I have clearly seen that there are many different styles and methods of building a boat. All of which are floating today, despite maybe being extreme for there time.
However my unfamiliarity with dofferent cat builds is why I posted here looking for info.
Feel free to share what you have seen and know about the subject of cat laminates...
Thanks

 

Thanks for the info Samnz.. Will look up Nina

 

IMG of Project - Incomplete

 

IMG - incomplete



The boat will be equipped with twin transom hung rudders with tiller steering. Open rear bridge deck cabin house. Rotating Wing mast. Daggerboards.

 

ok you got some renderings... these wont help much at all for a laminate schedule, just gives a general idea of your theme which is better than nothing...

engineering needs numbers...

do you know the;
sail area, sail plan?
rig height and type?
max heeling moment of the ship?
what is the beam and or hull centerline spacing dimensions?
length to beam ratio of the hulls?
any detail on the centerboard and rudder design?

 

The mast on the drawing is about the same length as the boat. Did you cut odd for space? A performance cat will have a much taller rig.

 

the plans for this beautiful performance cat run at $13,000 and includes non-stop over the phone build support...
http://www.schionningdesigns.com.au/login/pages/images/Gforce1500studyplansa4.pdf

The study plan above, gives you a full materials list to complete the shell, you can get an idea of ths laminate schedule from this aswell as material cost - it uses balsa core instead of foam however.

$13k is nothing in the grand scheme of the build which will no doubt set you back something in the order of $300-400k to build the enitre boat, fit it out and rig it, not to mention the 7000man hours of labour... if you beleive $13k isnt worth it on a project this size, then good luck to you...

 

The numbers you requested?
Condition Summary

Load Condition Parameters
Condition Weight / Sinkage LCG / Trim TCG / Heel VCG (in)
Condition 1 4988.000 kgf 0.000 deg 0.000 deg 0


Resulting Model Attitude and Hydrostatic Properties
Condition Sinkage (in) Heel(deg) Trim(deg) Ax(m^2)
Condition 1 -4.011 0.000 0.000 0.62


Condition Displacement(kgf) LCB(in) TCB(in) VCB(in) Wet Area (m^2)
Condition 1 4988.003 352.861 0.000 -11.715 20.405


Condition Awp(m^2) LCF(in) TCF(in) VCF(in)
Condition 1 16.067 351.488 0.000 -4.011


Condition BMt(in) BMl(in) GMt(in) GMl(in)
Condition 1 18.444 1551.094 6.73 1539.38


Condition Cb Cp Cwp Cx Cws Cvp
Condition 1 0.386 0.543 0.726 0.711 2.437 0.532

 

Analysis Type FreeFloatEquilibrium

Surface Meshing Parameters

Density 1 Minimum edge length 0.00000254 in
Maximum angle 0 Maximum edge length 0 in
Maximum aspect ratio 0 Max distance, edge to surf. 0 in
Minimum initial grid quads 0 Jagged seams False
Refine mesh True Simple planes True


Load Condition Parameters

Weight 4988.000 kgf
Model Trim 0.000 deg
Model Heel 0.000 deg
VCG 0 in
Fluid Type Seawater
Fluid Density 1025.900 kg/m^3
Mirror Geometry False


Resultant Model Attitude

Heel Angle 0.000 deg Sinkage -4.011
in
Trim Angle 0.000 deg


Overall Dimensions

Length Overall, LOA 622.819 in Loa / Boa 7.616
Beam Overall, Boa 81.778 in Boa / D 0.767
Depth Overall, D 106.643 in


Waterline Dimensions

Waterline Length, Lwl 567.641 in Lwl / Bwl 9.390
Waterline Beam, Bwl 60.453 in Bwl / T 2.702
Navigational Draft, T 22.376 in D / T 4.766


Volumetric Values

Displacement 4988.003 kgf Displ-Length Ratio 46.380
Volume 4.862 m^3
LCB 352.861 in FB/Lwl 0.566 AB/Lwl 0.434
TCB 0.000 in TCB / Bwl 0.000
VCB -11.715 in
Wetted Surface Area 20.405 m^2
Moment To Trim 343.583 kgf-m/in


Waterplane Values

Waterplane Area, Awp 16.067 m^2
LCF 351.488 in FF/Lwl 0.563 AF/Lwl 0.437
TCF 0.000 in TCF / Lwl 0.000
Weight To Immerse 418.683 kgf/in


Sectional Parameters

Ax 0.621 m^2
Ax Location 373.125 in Ax Location / Lwl 0.601


Hull Form Coefficients

Cb 0.386 Cx 0.711
Cp 0.543 Cwp 0.726
Cvp 0.532 Cws 2.437


Static Stability Parameters

I(transverse) 2.278 m^4 I(longitudinal) 191.555 m^4
BMt 18.444 in BMl 1551.094 in
GMt 6.73 in GMl 1539.38 in
Mt 18.248 in Ml 1550.898 in



Location (in) Immersed Area (m^2) Immersed Girth (in)
13.054 0.000 0.000
82.257 0.037 20.259
151.459 0.172 42.634
220.661 0.355 60.493
289.863 0.525 73.096
359.066 0.618 79.263
428.268 0.579 77.432
497.470 0.388 65.886
566.672 0.106 41.576

 

In your opinions what other info do i need to obtain from NA who did design to pass on enough info for help with laminate drawings for builders.?

I have general laminate plan, sailplan, hydrostatic, weight, buoyancy, cg, weight lightship and max. 3dm files containing all the above...