Sides not so easy but a similar process to that above, tape an inch or so then glue, then
repeat until I got to the end. Second side more of the same lots of tape and the odd
elastic band finally got the job done. Did get some distortion doing this but seem OK
once I put internal spreaders in.
Added some Spreaders and the Transom, this gave it the increase in strength that I
wanted, next figure out where to the keel and mast base need to be added, then cut the
slot for the keel. Had looked at ways to make a suitable keel and came up with some
1 inch by 1/8 Aluminium flat bar hiding in the roof of my shed, which I then decided
to cover with balsa to give it size and shape.
Figured Aluminium would be both light and strong for this job, and I should be able
to bond a 4 oz Lead fishing sinker to the end of it to give me the required ballast.
To make the boat I little more robust while I was build it I gave the shell a quick spray
with some clear epoxy, and after it had dried some sand and sealer. Profile was now
looking a bit more like the photos I had looked at on the net, so felt I must be headed
in the right direction.
Next Step was to locate the Servo’s within the shell and allow room for the receiver
and battery pack. I had a couple of Futaba S3003 standard servo’s, and looking at the
specifications on the net they would have no problem being used with a sail arm, so
back to the Aluminium flat bar and make a sail arm that I would fit on the standard
servo arm. After some head scratching settled on a length of 2 ¼ inches, this would
clear the other servo on the layout I had proposed and should give enough sail
movement as well.
Now need to think about Rudder and Mast and location of the fittings for the sails,
and for and the remaining equipment, also had to make the keel with ballast, so
decided to tackle that next. Roughly shaped the Lead sinker purchased from the local
large super markets fishing section. Cut a slot in the lead to match the bar, and then
attached the bar in to the slots and pined it in place with some small nails. I then
mixed up some fibreglass resin (normal used for small repairs on cars) and coated
around the lead bulb and bar to fix it in place. Once it had gone off then cleaned up
the rough shape with a file and glass paper. Next step sandwich the flat bar between
some Balsa to give it the required size and shape. Now the are no real dimensions
shown on the drawing I had for this design so I elected to guess this by looking at
photos and then knowing the length of the yacht (12 inch’s) guess the size of the keel.
The basic concept behind the footy, allows for some variation so that as long as fits
within the Box it seems the rest is up to the builder. It looks OK to me and so that
was the way I came up with my keel. Next step would be the Rudder. I looked at
some more photos, came up with what I felt would be nice dimensions new that it
could be up to 200 mm long but settled on 90 mm by 50 wide. I had some balsa left
over from my springer build 6 mm thick so cut out the shape and drilled a hole to take
some brass rod and 5 minute epoxy held it in place. Out with a sanding block and
shaped it to the improve it’s overall efficiency.
To fit the keel to the main body, I elected to go for the fibre glass resin again, I had
drilled the end of the aluminium that made up the keel with two holes the idea being
that I would insert rods through these holes and distribute the load of the keel across
the bottom of the boat. I mixed up some fibre glass to hold it in, however did put in a
little to much hardener, so although I fitted it in OK and it was glassed it in place the
mixture went off before I smooth out the surface so it looks a little rough. I does
however have the strength of the proverbial “Brick Out House”.
Now to give it first coat of paint, Test fit the servo’s, rudder and mast etc to make sure
that it’s all going to work together. I now need to make a boom for the main sail, so
did it in such away that it rotates around the mast. I made the boom from aluminium
tube and the bearing unit from some galvanised iron sheet, which was held into the
end of the boom with epoxy. The boom is re-enforced with wood dowel inside the
tubing, as is the mast, as it was very thin walled tubing.
I have since modified the design above to that shown below so that it does not move
out of line, as I found on its first test sail, that it moved upwards to much as the
pressure came on it from the main sail, this distorted sail shape, and then it tended to
Test fitted all the components and then added the deck to the main body of the boat,
you can see from the photos that the deck was left untrimmed so that I could cut
notches in it to put elastic bands around the model to hold it in place while it was
glued. Looks ugly but it was effective in holding it down. The deck also contains
three beads in it to allow for the control threads to pass through, as well as a small
tube for the antenna wire. I put in three beads as I was not sure at this stage which
way I would run the control threads for the Jib, this was really getting to the stage of
design as you build, but I tried to leave several options available as I went.
At this point of the construction I decided to fill the bath with water and check for any
leaks. After an hour or so, it was as dry as if it had never been wet so I guessed it had
passed that phase of construction. Several days where now spent sanding down and
painting the main body of the boat, as well as creating a hatch cover that is held in
place by a couple of strong magnets. My next move was to create the sails. To start
with I obtained some plastic sheet from a heavy duty shopping bag, and after studying
lots of Sail photos cut out the main sheet and fitted it. Testing with a fan I modified it
to get the correct looking sail shape then I need to get some Sail material. No kite
shops near me, but figured while having a shower that polyester shower curtain
material was close to what was needed, so down to the local super market and home
with one shower curtain, small problem with choosing the colour however, I could
have pink or pink, I got pink.
Using the original plastic sail as a pattern I cut out a main sail and fitted it, tested with
the fan seemed to give me the required shape so now I need to make the Jib from the
same material. More examining photos and two attempt later I had that made and
fitted it to the boat, it looked OK. Fitting the various control lines proved very fiddly
but got there after a couple of goes. It looked OK now I needed to charge the batteries
put it in the water and see what it would do.
More in the near future, think I am getting the hang of
adding the pictures now!!!