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Vac-U-Boat Vac-U-Tug User manual

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Vac-U-Tug™
Model Tugboat
Hull Kit
For Radio Control
Manufactured by Vac-U-Boat™
1259 Humphries Rd.
Conyers, GA 30012
philpace@vac-u-boat.com
CHOKING HAZARD - Small parts. Not for children under 3 years.
WARNING - To avoid danger of suffocation, keep plastic bags away from babies and children. Do not use in
cribs, beds, carriages or play pens. THESE PLASTIC BAGS ARE NOT TOYS.
WARNING: Brass parts in this kit contain lead, a chemical known to the State of California to cause cancer
and birth defects and other reproductive harm. Bronze and brass alloys can contain .03% to 3.7% lead.
WARNING:
Thank you for purchasing this Vac-U-Boat hull kit. It is easy for the novice to build in just a few
hours. The drive system is very durable and should provide years of service with very little maintenance.
The H.I.P.S. “High Impact Poly Styrene” hull is lightweight and strong. It is trimmed by a rubber rub rail
that will greatly reduce the chance of damage to other boats during a collision. At full throttle, it runs at a
normal walking pace making it easily controlled by young children without the risk to the the “adult toy
boats” in the area.
There is plenty of room inside for your radio gear and batteries. The motor draws only .45 Amp
cruising at full throttle. With a two channel radio, electronic speed control & average servo use, the total
draw can average .76 Amp. With a new, fully charged 1,500mA 7.2 volt rechargeable battery, Vac-U-Tug
will run for 1.5 to 2.0 hours! With this setup, about 27 ounces of ballast weight is necessary. This means
that you can substitute heavier batteries or add electronic gear without overloading the hull. Oilite®
bearings support the stainless steel prop shaft in a custom-drawn brass stern tube. A syringe of non-toxic,
plastic-friendly synthetic grease is included for filling the stern tube. The brass motor-prop shaft coupling
uses an acetal plastic dogbone that has self-lubricating properties to minimize wear. The injection-molded
rudder is cast over a solid brass shaft and supported at the rudder arm with another Oilite® bearing. The
screws are stainless steel. A DU-BRO™ E/Z Connector is provided to attach the stainless steel pushrod to
the servo .
The boat can be painted with plastic-compatible hobby spray paints. Plastic-safe paints like Hobby
Enamels, Krylon Fusion or Rustoleum 2X paints are the best. Sprayed or brushed acrylics work well too. If
you are building the boat for a young child, I recommend that you spray the boat in their favorite color
(even if they want it sprayed pink) then apply the vinyl decals and let them add their own customizing
decorations.
Please read the following information, warnings, tips and tricks before building this model. Use caution
with glue, the plastic bags, and small parts if children are around. Read the labels of all adhesives, paints,
and electronics purchased for this hull. Use extreme care with hobby knives when cutting plastic.
Remember to turn on the transmitter first, then the boat’s receiver. Mount the boat switch on the cabin
wall so it will be easy to locate. Teach your child to turn off the boat before lifting it out of the water. Even
a plastic prop can be hazardous to their little fingers.
Enjoy your Vac-U-Tug. If you have any questions, you can contact me at philpace@vac-u-boat.com.
Phil Pace
Length: 22.5 in. Beam: 7 in. Draft: 2-3/8 in.
TM
WARRANTY AND RETURN POLICY: All Vac-U-Boat Hull Kits are sold direct from Vac-U-Boat. If you
purchased this from a dealer, contact that dealer on any matter of return. If you open and inspect this kit and for
any reason you do not wish to keep it, return all of the parts to their bags and repack the kit into it’s box along
with a copy of the receipt. (Keep an original for your records.) Mail to Vac-U-Boat via the United States Post
Office, Parcel Post with tracking. Please do not use any Express Mail carrier or send COD. Upon receipt of the
complete kit, I will reimburse you the original cost plus the cost of the return postage shown on the package and
mail those funds to the name and address on the receipt copy. I will replace any defective part found during the
assembly or operation of the boat for a period of three months after the purchase date. This warranty does not
cover damage caused by abuse, misuse, improper spray paints, alteration or accident. It does not cover
consequential damages. You may have other rights, which vary from state to state. Caution: Never leave the
boat in a hot car. It will melt!
CUTTING PLASTIC: Adults only! A sharp pair of sewing scissors is best to trim around the parts. Cut through
sharp corners in the plastic with a hobby knife. While H.I.P.S. is tough, it will tear. When cutting out holes, as in
the top of the Cabin and through the rear hatch, score the opening with the tip of the hobby knife. (Just a deep
scratch.) Then trace the score 2 or 3 more times and you will cut through the plastic. As you cut through the
plastic, hold the knife at a side-angle to keep the blade from binding in the cut. Don’t hurry. Draw the blade
slowly along the plastic to prevent overcutting. Think about where the blade would go if it slipped. (Like, into
your leg or arm!)
GLUE: You will need about two ounces of 30-Minute or “2-Ton” epoxy. Most 15-Minute or shorter-time
epoxies will break down over time with exposure to water. 30-Minute is waterproof and gives you more working-
time for this model. Epoxy is used for the rudder shaft, skeg reinforcement, rudder bearing & ballast weights.
Where specified, a filler should be added to make the epoxy less brittle, increase the volume, and to thicken it.
Dry plaster, talcum powder, or micro-spheres all work well. Mix the two parts of the epoxy together first. Then,
add the same volume of filler material and fold them together until blended. Medium CA (super glue) is best for
gluing the H.I.P.S. together when attaching the Hull to the Deck, the Pilot House Roof to the Pilot House and for
the Stack to the Deck. “Gorilla” brand Super Glue has a “medium” consistency and works well. If you are
inexperienced with CA Glue, those small metal tubes of Model Cement found where plastic model cars are sold,
either the regular kind or the “non toxic” type will work. Model cars are made of the same type of plastic as this
boat. However, because the sheet plastic is so thin, it will melt more easily if you use too much glue. CA provides
the strongest seam with less chance of weakening or melting the plastic but must be used in a well ventilated area.
Both CA and Model Cement are permanent. If you think you will ever want to separate the upper and lower hulls,
then glue them with epoxy. You will have to scuff the surfaces of plastic to help the epoxy bond to the plastic.
Gentle prying will separate the parts. Experiment with the glues using the scrap of plastic you cut from the top of
the deck. This scrap can be used for testing glues or paints. Glue them together and then try to tear them apart.
Sandpaper, rubber bands, clamps and other tools are included to help with assembly.
PAINT: Use spray paints that are labeled as safe for plastics. The short cans of “Hobby Enamel” found at your
hobby store, or spray paints safe for plastics like Krylon Fusion or Plasticote brands work best. When buying
them, if the lid isn’t sealed, remove the cap to see if someone “test sprayed” the can. If it has any paint residue on
the spray nozzle, don’t buy it. It is likely clogged because it was not properly cleared by inverting the can and
spraying the paint out of the nozzle. (See the can’s directions.) No sanding is necessary. Hobby Enamels, Fusion,
and Plasticote will bond with the H.I.P.S. well as long as the plastic is clean. Don’t get grease or oil on the plastic
as it can repel the paint. If in doubt, wash your hands with liquid detergent before handling the plastic. Buy a can
of Clear Hobby Enamel or Clear Krylon Fusion when you are getting the colors. It makes a great top coat on dull
metallic or dark colors that don’t gloss on their own. Test the colors on the scrap to see if a coat of clear is
necessary. NEVER USE LACQUER OR AUTOMOTIVE PAINTS ON H.I.P.S. PLASTIC. It will soften the
plastic and greatly shorten its life span and may completely melt the plastic. Avoid all tall spray cans like Krylon®
or other “household enamels”. They will damage the thinner areas of the sheet plastic. Don’t be fooled by test
spraying auto paint onto the scrap. They are thicker than the model parts and will be less affected. Avoid the short
cans of lacquer you will find at hobby stores. Ask for hobby enamel. I have listed additional painting tips at the
end of the manual.
2
BOW
(Front)
STERN CABIN
HULL
PILOT HOUSE
SKEG KEEL
RUDDER
HATCH
EXHAUST
STACK Prop
Shaft
Shaft Bearings
Stern TubeGrease
Prop
Prop
Nut
Drive
Dog
Dogbone
Motor-Shaft
Coupling Ends
3
PROP SHAFT ASSEMBLY
SYNTHETIC GREASE SYRINGE
HULL
SKEG REINFORCEMENT
HULL LINER
SERVO TRAY
3 RUBBER BANDS
4 STAINLESS SERVO TRAY SCREWS
100 GRIT SANDPAPER
SERVO TRAY SCREW REINFORCEMENT STRIPS
DECK
PILOT HOUSE
HATCH COVER
PILOT HOUSE ROOF
STACK
BOAT STAND
MOTOR-SHAFT COUPLING ASSY.
RUDDER
RUDDER BEARING
SKEG
SKEG SCREWS
RUDDER ARM & SET SCREW
MOTOR
MOTOR MOUNT
MOTOR CLAMP
STAINLESS MOTOR SCREWS
MOTOR-SHAFT ALIGNMENT CLIP
HOOK & LOOP FASTENER
STAINLESS RUDDER PUSHROD
E-Z CONNECTOR
HATCH WINDOW
WOOD BLOCK
PAPER CLIPS
20 CLAMPS
2 X 3 PLASTIC BAG EPOXY SHIELD
RUBBER RUB RAIL
DECAL SET (Not shown)
Vac-U-Tug Kit Contents
IN ORDER OF APPEARANCE:
Lube & Mark Prop Shaft
To complete the radio-controlled boat, you will need:
ADULT SUPERVISION, 2-Ton or 30-minute epoxy, medium CA glue, (Regular or non-toxic model
cement will work fine but CA “super glue” is needed for the end joint of the rubber rub rail) electric drill with
bit assortment, screwdrivers including a tiny Phillips screwdriver for servo screws, scissors, hobby knife or
Xacto® knife, ballast weights (a carton of 5,000 BB’s or lead shot work well), pencil, masking tape, light
sewing-machine oil, plastic compatible spray paint or non-toxic type brush or spray acrylic paints compatible
with plastic.
1. A 2-channel pistol (Recommended) or stick radio with one standard servo. AM, FM or 2.4 Ghz
(Recommended to avoid conflict with other boats, especially needed if you are building a rescue boat.).
2. An economical ESC Electronic Speed Control with forward and reverse. A waterproof ESC is not re-
quired. Read about ESCs on the vac-u-boat.com home page link.
3. A rechargeable battery. Either a 6-cell 7.2 volt NiMh Nickel Metal Hydride or a 2S 7.4 volt Lithium
Polymer battery. Each type of battery has different rules regarding safely charging them and their
charge-state when not in use and their safe storage. Consult the manufacturer or the internet for recom-
mendations for your type of battery. 7 or 8 cell NiMh (8.4 or 9.6 volts) or 3S LiPo (11.1 volts) can be
used for more power if your ESC is designed for the additional voltage.
4. A safe charger for your battery. Wall chargers or more expensive peak detection chargers will do fine.
Never charge a battery without constant supervision. Read the battery and charger instructions and
warnings. Never charge the battery in the model. Never leave the charger unattended.
RC radio sets usually come with a battery pack for 4 AA batteries. These will power the receiver and ser-
vos if you don’t have an ESC with Battery Eliminator Circuitry BEC. Most ESCs have the BEC feature.
This means that the large rechargeable battery that runs the motor will also power the receiver and servos
through the ESC when the ESC is plugged into the receiver. The ESC will have a switch that turns on and
off the power to the receiver. For most ESCs, you will not need the 4-AA battery pack.
Squeeze the synthetic grease into
the Stern Tube until it comes out
the other end.
Push the Prop Shaft into the stern
tube. This will push out the excess
grease. Wipe off the excess with a
paper towel. Be careful to keep any
grease off of the brass Stern Tube.
You will need sharp scissors
and a box cutter or hobby knife,
whichever you are the most
comfortable using.
Put a mark on the Stern Tube
about 3/8ths of an inch from
the end of the bearing.
Trim the Hull along the marked
line on it’s underside. The
plastic is thick for a stronger
hull. Use sharp scissors!
With a 1/4” drill bit, drill through the
Rudder Bearing hole. Use gentle pressure.
Let the drill slowly drill through the
plastic to avoid it splitting.
123
456
4
Trim The Hull
Round out the hole if necessary.
With a rocking motion, slice
through the Stern Tube hole as
shown. Cut down 2/3rds then cut
up 1/3rd to complete.
As you drill, check the alignment to
ensure the hole is in the center.
Sand the area inside the Hull at the stern
to help the epoxy bond the skeg
reinforcement to the Hull. Test fit the
skeg reinforcement into the hull.
789
10 11 12
13 15
16 17 18
5
Measure out two inch-wide
puddles of epoxy parts A & B.
14
After mixing, fold in the same volume
of filler material. I’m using Talcum
Powder. The filler makes the epoxy
less brittle after it cures.
Put the filled epoxy on the bottom
surfaces of the Skeg Reinforcement.
Put lots of filled epoxy in the
recess of the hull where the skeg
reinforcement will set.
Set the reinforcement into the stern
of the hull.
Press the Skeg Reinforcement into
the epoxy. Cover the reinforcement with the
squeezed-out epoxy.
Install Skeg Reinforcement
Sand all surfaces of the Skeg
Reinforcement. The skeg is the
square brass tube that supports
the bottom of the rudder.
Mark the outline of the flat oval at
the stern of the Hull Liner.
Score the oval along the line
until the oval separates from the
liner.
Set the Servo Tray into the Hull
Liner as shown. If needed, use 2
rubber bands to snug the liner.
With the Servo Tray slid against
the raised bumps on the liner,
mark the 4 holes with a pencil.
Drill 1/8 inch vent holes into the
liner on each side of the floor ribs
as shown.
These are the Servo Tray Screw
Reinforcing Strips. They provide a
better anchor for the screw threads.
Drill 3/32 inch holes at the 4
marked Servo Tray holes.
Trim any bits from the underside of
the drilled holes.
Mark the Reinforcing Strip
through the Hull Liner.
Hole the Reinforcing Strip under the
tray mount holes.
Tilt up the hull with a book to keep
the epoxy in place as it cures.
19 20 21
22 23 24
25 26 27
28 29 30
6
Trim the edges of the Hull Liner
along the marked line.
Trim The Hull Liner
Install the Servo Tray
Drill the Reinforcing Strips as
marked with a 3/32” drill.
Turn over the Hull Liner and sand
the areas that will contact the Hull.
Set the Hull Liner into the Hull.
Use a pencil to lightly mark the hull
along the top of the Liner.
The screws should pull the
Reinforcing Strip tight against the
Hull Liner.
Instead of waiting for the CA to
bond, go ahead and install the tray
and screws. The screws will hold
the strips in place.
Sand the area inside the Hull below
the marked line. Sand the areas around
the rudder and prop shaft holes.
Practice setting the Hull Liner into
the Hull for the next step.
If you are in a hurry, you can
CA the Liner. Otherwise, mix
another batch of epoxy. 1-1/2
inch circles.
Metal rods make great stirrers. With
them you can fold the epoxy over
and cleanly push it around.
Now you have a handle for the
Hull Liner.
Don’t forget the thin edges and
bottoms of the floor ribs.
31 32 33
34
Apply Medium CA (super glue) to one
strip. Hold the strip against the underside
of the rail with the holes aligned.
35 36
37 38 39
40 41 42
7
Glue in Hull Liner
Dab along the sharp edges. 30-
minute epoxy can gel in 10 min. You are ready to set the Hull Liner
into the hull.
If using CA, these lines mark
where you should put CA glue on
the Internal Tray before inserting it
into the Hull. Mix the epoxy and add filler. Find
the Epoxy Brush. Holding the Liner, apply the epoxy by
lightly dabbing the sanded areas.
It doesn’t have to be pretty. But, you
should work as fast as you can.
A couple of cans or similar weights
will help hold down the Liner until
the epoxy has cured.
Insert bow-first, trying to avoid
touching the sides of the Hull with
the Hull Liner.
While you are waiting on the Hull
epoxy to cure, trim the deck pieces. The Deck top recess is marked. Score
3-4 times and it will separate. Don’t
try to cut through the first time.
The rear hatch opening is marked
for trimming the same way. No
rush.
43 44 45
46 47 48
49 50 51
52 53 54
8
Press into place. If the sides of the Hull
are not making good contact with the
sides of the Liner, add rubber bands.
Put CA along the edge too.
Trim Deck & Superstructure
Use alcohol to
clean off stray
epoxy.
Sand the area where the motor and
motor mount will be glued. Sand all around the ballast and shaft
area.
Sand the rudder hole area if you
missed it earlier.
Fold a piece of paper and use it as a
spacer between the coupling end
and the stern tube. Tighten the two
set screws and remove the paper.
This should leave a small gap there.
Open the Rudder Package.
Take the brass Skeg and 2
screws.
Use a 3/32 inch drill to drill a
straight hole through the Hull
and Skeg Reinforcement.
Cut curves by taking shorter
snips. If the edge is uneven, you
can sand the cut edge.
Sharp corners should be started with
a razor using a rocking motion until
the blade cuts into the plastic.
Now break off the cut corner. Use
scissors to follow the trim line
marked on the Hatch Cover.
Place the Skeg on the hull, aligned
with the keel (bottom board) of the
hull. Mark ONLY the end screw hole.
55 56 57
58 59 60
All trimmed. The hull should be
set by now. Check the mixing
board to make sure.
61 62 63
64
Insert the Stern Tube Assembly into the
hull. Slide the 1/8 in Coupling End onto
the shaft. Note the location of the flat
on the shaft.
65 66
9
Install Prop Shaft Assembly
Install Rudder & Skeg
Insert the longer brass rod of the
rudder into the bearing. Slip the Skeg onto the rudder and
attach the bow-end screw into the
Skeg. Just snug the screw for now.
Align the Skeg with the Keel of the
Hull.
Press the Rudder Bearing into the
1/4 inch hole.
Rotate the Skeg aside, and drill
only into the white plastic, not
into the reinforcement yet.
Align the Skeg and tighten the front
screw. Now continue drilling into the
reinforcement, using the hole in the Skeg
as a guide to keep your drill centered.
Tighten both Skeg screws. The Rudder should turn freely
without binding. The Skeg and Rudder should align close
to this. It does not have to be exact.
Mark the 2nd hole then loosen the
first screw 2-3 turns.
67 68 69
70 71 72
73 74
Using a Skeg screw as a guide,
wrap a piece of tape on the drill to
make a depth gauge.
75
76 77
10
78
Drill until your “Depth Gauge” contacts
the Skeg. You should pull out the drill
once or twice during the drilling to
remove plastic from the drill bit.