count teh convolutions

bow is to the right in all renders.

the pushrod input is the pair of rod ends in olive colour on the right hand side. the pushrod is not perpendicular to the centreline, hence the rod ends. 

this goes into the first rocker (pinkish). it has the same ratio and phase as the wand lever so the rotation of the bolt at the bow is exactly telegraphed (not sure if this is important, but may help with future development). 

phase can be adjusted on this rocker by spinning (nigga) the on board bolt,  draging the right hand side of the green linkage around that arc track. this is set up for adjustment on the land only. i may add a nob (ur) to the top to make it adjustable from the cockpit. 

green linkage is a turnbuckle that is needed to use the extreme range of the phase adjustment. for minor adjustments to phase, it shouldn't be required, the brown rocker just won't stand up straight. 

brown rocker is the gearing. spinning the bolt drags the input pin up it's track. going up amplifies the signal. it has a rope guide on one side only that moves with the rocker, however i expect it will be able to be adjusted from both sides of the boat, it will just need to remain rather tight, and i may need to make some sort of lead for it. 

next is a blue linkage made from a turnbuckle. this acts as a dial. just before it exits the machine there are two nuts on either side of a plate. these are limit screws that mean no matter what you do upstream, it will bottom out on this plate before damaging the centreboard pushrod. will also be a convenient way to see what the flap is doing. 

bearings are to be pressed in, then retained with worm screws. i have just bought some shock aborbers to add into there somewhere (probably on the pink one, with a screw to adjust lever to for dampening). wand length, bungie and wand stopper will also be run to the tramp, seperate to this machine but equally complicated. 

all plate parts are watercut 4mm aluminium hard coat anodized. bolted to the boat with 5x M5 countersunk fasteners into a carbon channel bonded to the deck. 

resistance prediction, table of hydrostatics

resistance numbers and table of hydrostatics now available as part of the design package.

i don't really have much to say about them except they may be useful for anyone doing a VPP where the lowriding, or partially supported case is of interest.

SLINO Weight Estimate (with pie!)

here i am, friday night watching 7:30 queensland on ABC doing a weight estimate for a boat i have already built and weighed. 

well, its one of the remaining files i promised with the design package. and maybe i am feeling a bit compulsive. 

but it does show some interesting things. the centre of gravity is futher aft and lower than i would have expected as shown in the graphic below (note it excludes skipper weight)

the weight calcs result in the following numbers:
     hull, paint, gantry   = 11.87 kg
     wings (alloy), tramps  = 9.89 kg
     foils, tiller  = 8.50 kg
     rigging, standing, running, control, mast, sail   = 13.06kg

    Total = 43.33 kg
 
This distribution is illustrated below.

this is clearly 6 or so kg overweight. as I have noted previously, changing the wings to carbon would save around 3 kg. changing to dacron tramps (rather than trampoline material) would save some too. and I need to change to carbon spreaders. 

the remainder i think would need to come out of the hull. my construction method of laminating the seams of prefab panels results in a lot more bonding than a moulded boat (2kg i would estimate). 

how else to save weight? maybe less hull, particulary in the foredeck. or if you were confident in your boat handling maybe a lighter panel laminate, like nomex and prepreg. 

that rigging component is still a large piece of the pie. easy to see how a wing is viable from a weight point of view. 

updated design files

Some recent interest in the design has inspired me to complete the design package for the boat.

Lots of detail info here:

http://perverted-moth.blogspot.com/2010/11/slino-design-files.html

New drawings are:

SL2-E1-02__04A - Hull Construction Details
SL2-E2-01__02A -  Centreboard Construction Drawing
SL2-E3-01 Stem and Transom Lug Construction Details
SL2-E4-01 Wing Mounts Construction Details

SL2-F4-01A - Running Rigging Arrangement

SL2-G1-01A - Control System Arrangement
SL2-G1-02A - Control System Parts

I am hosting them on google docs. if anyone has trouble downloading them could you let me know and i will investigate different hosting arrangements.

Foredeck

Just mucking around with some concept designs...





More of the hull, deck and wings to come. Not happy with them as a whole yet.

SLINO Design Files

Please Note:
I am publishing this information as a personal reference only. If you chose to replicate it, it is at your own risk. This information carries no warranty and has not been thoroughly thought through or engineered. Building and sailing a moth to this design could seriously hurt you and/or cost you a lot of money and/or cause emotional damage.

If you do attempt to replicate derivate from this information please send me an email – I am always interested to see where this design leads. (mr.markla@gmail.com)


See Also:
http://perverted-moth.blogspot.com/2009/01/new-moth-design.html


Documents and Calculations
SL2-A1-01A - Drawing and Document List
SL2-A1-02A - SLINO Build Sequence
SL2-A1-03 - Parts List
SL2-B1-01 - Weight Estimate
SL2-B2-01 - Table of Hydrostatics
SL2-B2-02 - Resistance Prediction


Drawings
SL2-C1-01 Side Profile Drawing
SL2-C1-02A - General Arrangement

SL2-D1-01A - Hull Lines Drawing

SL2-E1-01A - Hull Construction Drawing
SL2-E1-02__04A - Hull Construction Details
SL2-E2-01__02A -  Centreboard Construction Drawing
SL2-E3-01 Stem and Transom Lug Construction Details
SL2-E4-01 Wing Mounts Construction Details

SL2-F1-01A - Wing Assembly
SL2-F2-01A - Gantry Construction Drawing
SL2-F3-01A - Spreader Construction Drawing
SL2-F4-01A - Running Rigging Arrangement
SL2-F5-01__02A - Cradle Arrangement

SL2-G1-01A - Control System Arrangement
SL2-G1-02A - Control System Parts

SL2-H1-01A - Hull Jig Assembly
SL2-H1-02A - Deck Jig Assembly
SL2-H1-03A - Foredeck Jig Modification

SL2-I1-01A - Carbon Cut File (1)
SL2-I1-02A - Carbon Cut File (2)
SL2-I2-01A - MDF Cut File (1)
SL2-I2-02A - MDF Cut File (2)
SL2-I3-01A - Hull Panel Marking
SL2-I3-02A - Deck Panel Marking


Rhino Models
All models have the same zero point, so you can import (or worksession) the components into a single file.
SL2-R1-01A - Hull Construction
SL2-R1-02A - Hull Jig
SL2-R1-03A - Wings

SL2-R2-01A - Centreboard

SL2-R3-01A - Rudder

SL2-R4-01A - Control System

SL2-R5-01A - Wing Sail

SL2-R9-01A - Cradle

wings

i did up a drawing of the wings on my boat for reference to the new slino. this drawing is available thru my google docs (i will gradually transfer all of my drawings to this site - still not sure where to put the rhino model and cad files, for now these can be emailed on request).

at the moment I am running aluminium wings as noted on the drawing. i also did some calcs for equivilent carbon wings (based on CST products):

76x1.27 Aluminium (EI 14.37kN/m2)
*ID63x1.8 Carbon

50x1.6 Aluminium (EI 4.92kN/m2)
*ID35x2.5 Carbon
ID40.4x2 Carbon
ID44.7x1.8 Carbon
ID47.2x1.5 Carbon

40x1.6 Aluminium (EI 2.46kN/m2)
ID32x1.5 Carbon
*ID30x12.6x1.5 Ellipse Carbon

As drawn in aluminium the wings would be approx 7.47kg
Using the alternative carbon sections marked with * above gets 4.72kg

A bugetary price for aluminium tubes is $266, for carbon $1873 (again using the * sections)