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PT-212

38

Kit No. 1257

1

28-312

Cradle

1

28-314

Bow Chock

12

28-315

Ventilators

ADDITIONAL ITEMS REQUIRED

Congratulations on your purchase of the Dumas boat kit, Kit No. 1257. As with most

Dumas model boat kits, there are some additional items that are needed to complete your boat to
power as a radio control model. We at Dumas know that you’re anxious to get started on your
model so we have enclosed this list that will aid you in purchasing the remaining items that you
may require. All of these items are available through your local hobby shop.

RADIO CONTROL

FOR ELECTRIC POWER



2-Channel Radio (minimum)



Battery 7.2V (6-cell nicad)



6V Electric motor (Dumas stock no. 2025)



Running Hardware Package (Dumas stock no. 2370)

FOR GAS POWER



Not Recommended

THANKS

We appreciate your confidence in our product as expressed by your purchase of

this kit. We hope that you have enjoyed building and operating the Dumas model kit and hope that
we can be of service to you in the future.

Good luck and happy boating.

Dumas Products Inc

909 East 17th Street

Tucson, Arizona 85719

(520) 623-3742

FAX (520) 620-1329

www.dumasproducts.com

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Summary of Contents for 1257

Page 1: ...sponsibility for any damages or other losses incurred that have resulted from misuse of the material presented here All instructions and drawings should be carefully studied and clearly understood before beginning this project Experienced modelers can jump into building this model and use whatever construction sequence and materials that appeal to them The less experienced modelers would do better...

Page 2: ...PT 212 2 Kit No 1257 DIE CUT PARTS LOCATOR SHEET ...

Page 3: ...PT 212 3 Kit No 1257 LASER PARTS LOCATOR SHEET ...

Page 4: ...rawing for the proper placement Trim your decals close to the design edges as you can to minimize the clear halos PLASTIC All of the plastic vacuum form parts were pulled from 040 ABS sheet Since the heated plastic is pulled over a form some stretching may occur which will thin out the plastic This is why the lifeboat hull thickness for example may end up being only 020 thick When cutting out the ...

Page 5: ...c to styrene plastic It will not work with the Expanded PVC PAINTING There is an old adage in the Navy that warns recruits to salute everything they see if it doesn t return your salute paint it gray Well just about everything on the PT boat is painted gray Even the horizontal surfaces are painted gray To eliminate fish eyes oils and dirt wipe parts with rubbing alcohol on a clean rag before spray...

Page 6: ...l side to side Place a weight inside the boat model to anchor it down so that is doesn t move C Tape a sharp pencil to a block of wood so that the pencil is the same height as the mark at the bow D Run a pencil around both sides of the hull You might need to go over it a couple of times until you can see your line If you don t want to use pencil you can also use a scribe to scribe a line but if yo...

Page 7: ...1 8 x 3 8 x 36 basswood for the stand floating somewhere in the kit box You will also find the full size patterns on the last 11 x 17 sheet Go look for FIG 87 3 Lay a sheet of wax paper over the two frame patterns This will prevent the parts from sticking to the drawing 4 Cut the individual lengths of 1 8 x 3 8 basswood to match the full size pattern BUILDING TIP As you have probably figured out a...

Page 8: ...round the edge of the opening in the Deck See FIG 5 13 Cut and cement 3mm x 1 2 PVC strips to frame the opening in the Deck See FIG 6 NOTE The PVC strips will run on the INSIDE of the pencil line so that as seen from the top you will have a 1 4 face of the strip showing on the outside of the opening This will act as a lip for the Deck Hatch to sit on 14 Place the Deck back on your building board s...

Page 9: ...s plastic quickly then I switched over to my sanding block with 100 grit sandpaper to finish it off 25 Fill in the seams with Bondo or putty to clean up the Deck and make it look nice FINISHING UP THE HULL 26 CHINE STRIP Cement a strip of 06 x 1 8 styrene along the Chine on both sides of the hull You will be using two strips for each side See FIG 11 NOTE Begin each strip 3 4 from the bow the point...

Page 10: ... Transom on the OUTSIDE 6 then cut a slot 7 32 x 1 1 4 See FIG 16 BUILDING TIP See FIG 17 To cut the slot first drill two 7 32 dia holes at the dimensions given above Then with a utility knife remove the center section of material The plastic is soft enough to cut through you can cut it by hand without any power tools 32 Measure forward from the edge of the Transom on the OUTSIDE 2 1 16 then cemen...

Page 11: ...e bottom of the hull You can blend it into the hull with Bondo to finish it off This is all of the hardware you will be installing at this time Don t worry about the pretty pictures you didn t use I guarantee you that by the time you have finished this boat model you will have used all of the figures BUILDING THE HATCH See FIG 25 42 Draw a line with a pencil 1 4 all the away the entire outside edg...

Page 12: ... the top of the Cabin and the 1 16 sq styrene strip See FIG 29 NOTE The dimensions shown on the drawing will aide you in locating LC28 properly See FIG 29 49 Cement LC29 to the top of the Cabin The edge of LC29 must stick out 1 32 See FIG 30 50 HANDLE Bend the 1 32 dia brass rod to match the full size pattern shown on the drawing to create the Handle See FIG 31 BUILDING TIP I used the very tip of ...

Page 13: ...you can squeeze the Brace up and over the Grab Rail that you think is in the way 64 Apply the Instrument Panel Decal to LC30 BUILDING TIP I would suggest that you leave the decal off until you have painted the area in question I know it s a tight fit but if you use a pair of tweezers to place the decal where you want it to go it s no big deal BUILDING THE TURRET See FIG 36 40 The two Turrets are m...

Page 14: ...Rings 76 GUN MOUNT Cut a piece of 1 16 dia brass rod to 4 long You will need two of them 77 Slide a 3 32 dia x 1 2 long brass tube 27 140 on to the 1 16 dia brass rod placing it somewhere in the middle 78 Bend the 1 16 dia brass rod to match the full size pattern See FIG 40 This will trap the 3 32 dia brass tube in the middle 79 Cut a piece of 3 64 dia brass rod to 3 4 long You will need four of t...

Page 15: ... and LC5 89 Cement LC4 to the rear edge of LC1 LC2 LC3 and LC5 90 GRAB RAILS Draw a line 3 16 down from the top edge of LC1 LC2 and LC4 NOTE There are two different sizes of Grab Rails needed 3 8 long and 1 2 long The 1 2 long Grab Rails go on each side of the Housing while the 3 8 long Grab Rail goes toward the rear Note the differences 91 Find the center of each line previously drawn then mark t...

Page 16: ...e UNDER the Cabin where the Turret and Rear Housing will be placed 98 Cement the two Turrets to the Cabin Use gap filling medium CA for this procedure 99 Cement the Rear Housings to the Turret Use gap filling medium CA for this procedure NOTE The Housings MUST be parallel to the Deck Hatch The distance should be about a fat 1 8 the true distance is 0 14 Which is neither 1 8 125 or 5 32 156 So wher...

Page 17: ... the spring back it will end up the exact size Then using a pair of long nose pliers finish bending the brass rod to shape 104 Drill a 3 64 dia hole in the top of the Housing where shown in the drawing See FIG 46 NOTE The hole should be 1 16 away from the outside edge The distance away from the Turrets depends on how well you bent the Depression Rail itself So line up the Depression Rail to verify...

Page 18: ...e is used 120 Tie a piece of thread Tan color is best if you got it from the end of the top Eyepin down to the eye of the bottom Eyepin 121 FLAG Cut out the American flag along the entire perimeter 122 Fold the supplied Flag in half to establish a crease 123 Remove the paper backing 124 Refold the Flag over the thread so that the Flag is positioned towards the top NOTE Install the Flag AFTER you h...

Page 19: ... LOOP See FIG 59 135 Drill a 1 16 dia hole in the top of the Shield using the dimensions shown in the drawing 136 Screw a Screw Eye 23 112 into the hole previously drilled trapping a No 2 Flat Washer 21 105 as you go NOTE The eye of the Radar Loop is facing off to the side PAINTING THE CABIN ASSEMBLY 137 Paint the Cabin Assembly GRAY or whatever color you want Let dry 138 Apply the Front and Side ...

Page 20: ...eceiver into the 1 16 dia holes previously drilled NOTE Each Cocking Lever must protrude out 1 4 from the side 148 SHOULDER REST 2 needed for each gun Bend 1 32 dia brass rod to match the full size pattern shown on the drawing See FIG 55 149 Cement each Shoulder Rest into the 1 32 dia holes previously drilled 150 AMMO BELT RACKS Cement the two Ammo Belts to the Receiver See FIG 56 NOTE Each Ammo B...

Page 21: ... part 156 Cement the Deck Grab Rails LC18 and LC19 to the forward Deck using the dimensions found on the full size drawing LIFE RAFT See FIG 61 157 Cut 1 4 x 3 8 balsa to match full size pattern then cement together NOTE Dimensions are given just in case the copier messed up the drawing 158 Sand the balsa frame to shape NOTE Choose between either the OVAL or RECTANGLE shape for your Life Raft 159 ...

Page 22: ...KET Cement two LC8 s to one LC11 then cement the remaining LC11 in place to the two LC8 s See FIG 63 174 Carefully sand the bottom edges of the box flat NOTE It may explode on you so be careful 175 Cut out the Base from the piece of 2mm x 6 x 6 PVC supplied in the kit to the dimensions shown on the drawing it s labeled REAR PAD See FIG 63 176 Cement the box to the Base as shown See FIG 63 177 Ceme...

Page 23: ...nifold on top of the Torpedo Tube and mark the locations of the adjacent bands found on the Torpedo Tube 197 Cut the white adhesive backed paper into 3 1 16 wide 2 long strips 198 Wrap the paper strips around the wood dowel at the locations where you marked previously See FIG 65 199 Cement the Manifold to the top of the torpedo Tube Yes the Manifold will lay toward the side of the Torpedo Tube NOT...

Page 24: ...212 Cut the Front and Rear Fuel Tank Hatch form the 1mm PVC sheet provided in the kit You will need to make only one of each 213 Cement the Fuel Tank Hatches to the Deck as shown in the drawing See FIG 68 ENGINE HATCH See FIG 67 68 214 Cut the Engine Hatch Top Bottom form the 2mm PVC sheet provided in the kit See FIG 67 215 Round over all four of the corners 216 Cement the Engine Hatch Top centere...

Page 25: ...l have to play around a bit until you get the right shape 232 Solder the two brass rods together BUILDING TIP I made a soldering jig from a scrap block of balsa using the hole pattern This will make the job of soldering much easier 233 Drill three 1 16 dia holes in the Deck Hatch using the dimensions shown on the drawing 234 Slide DO NOT cement three brass Eyelets onto each individual brass rod 23...

Page 26: ... the center of the round over end 255 Cement the two sets of LC17 s to the small wood dowel using the dimensions shown on the drawing 256 Cement a Strap 04 x 08 styrene to each LC17 and the wooden dowel 257 Cement the Cap 28 268 into the hole previously drilled at the front of the dowel 258 Paint the Smoke generator to match your boat 20mm OERLIKON See FIG 75 81 The 20mm Oerlikon machine gun is ti...

Page 27: ...y about it It s nice to have the groove there to give the Shoulder Rest a solid foundation but it s not the end of the world if you don t do it 273 Cement the Shoulder Rest to the rear of the Receiver See FIG 78 Use gap filling medium CA glue for this procedure 274 GUN SIGHT Laminate and cement together two LC25 s We will call this the Gun Sight Support See FIG 79 275 Cut a piece of 1 32 dia brass...

Page 28: ...e Elevating Crank 286 Cement the Cradle 28 312 in the hole previously drill on top of the Base 287 Cement the Gun assembly at the location of the Receiver to the Cradle NOTE If your Cradle is wider than your receiver then add thin shims of plastic 010 thickness should do it NOTE Cement the gun at an elevation that suits your desires 288 Cement the Elevating Crank 28 267 to the Base This now comple...

Page 29: ...uffing Box As the Shaft emerges from the front of the Stuffing Box slide on the small Nylon Washer then the Set Collar and finally a Coupling Lock the Coupling in place with a 6 32 Set Screw There should be a tiny bit of end play in the shaft assembly to ensure against binding OBSERVATION If the Shaft you have was cut a little under the 7 3 8 stated length and there isn t enough room for the small...

Page 30: ...hase it separately NOTE You will find a wooden block 1 2 x 1 7 16 x 6 somewhere in the box We are referring to this wooded block as Motor Mount Blocks 298 Sand the bottom of each Motor Mount Block to match the inside curvature of the hull See FIG 13 NOTE Both of the blocks must be standing straight up and down as seen from the front when properly positioned 299 Cement the two Motor Mount Blocks to...

Page 31: ...ht strong and maintenance free If you don t like using the Rudder as supplied you can always substitute 032 brass sheet for it That option is totally up to you 310 Trim or file the four corners of the rudder blank shown in the drawing NOTE Due to variations with copy machines the full size pattern may or may not the true size but it will be close Remember it s just a toy 311 Draw a line 1 4 away f...

Page 32: ...vo Tray is a simple device to anchor the Servo inside the hull If you don t plan to use my simple device you can always stick the Servo to the inside of the hull with Velcro I did this on the very first prototype and found that the Servo wiggled around a lot You may or may not like the way the Servo moves around on the top of the Velcro I thought that might be a problem too However since I have ru...

Page 33: ...a pool it doesn t matter BATTERY 7 2V The battery that is recommended is a 6 cell 7 2V nicad battery pack Dumas No 8302 This should give you a running time of about 15 minutes 10 minutes if you run it at full throttle However a couple of times I ve gotten around 20 minutes from this battery So go figure Our other battery the 6V gel cell battery Dumas No 2024 is not recommended There simply is no r...

Page 34: ...it into the Stuffing Box Once you are satisfied that you have enough grease in the Stuffing Box place your finger over the end of the Stuffing Box inside the hull and insert the Shaft into the rear end of the Stuffing Box The pressure inside the Stuffing Box should be enough to force the grease in the remaining space inside the Stuffing Box As the Shaft is exiting the end of the Stuffing Box wipe ...

Page 35: ... and finished your model Extra glue blobs and thick paint really add up The motor propeller combination as built pushed the model along at a nice scale speed Don t have doubts about the small propeller included in the kit I know a shinny brass propeller would look nice but being a heavier piece it will put more load on the motor which in turn will reduce the running time on the batteries I used th...

Page 36: ...asswood 1 8 x 3 8 x 36 Stand 1 Dowel 3 16 dia x 12 Manifold Ventilators 1 Dowel 1 4 dia x 18 Manifolds 1 25 1048 Dowel 1 2 dia x 1 3 4 Smoke Generator 4 25 1047 Dowel 3 4 dia x 8 1 4 Torpedo Tubes BRASS 1 59 166 Brass Rod 1 32 dia x 18 Various Details 1 59 172 Brass Rod 3 64 dia x 36 Depression Rails 1 55 100 Brass Rod 1 16 dia x 36 Rudder pushrod Mast Depression Rails 1 27 281 Brass Tube 1 16 dia...

Page 37: ...ntenna 1 23 112 Screw Eye Large Loop Antenna 8 23 118 Brass Eyelets 20mm Gun Sight Depression Rail Manifolds 8 28 162 Eyepins Antenna Stanchions Ammo Boxes Mast 1 Pine Block 1 2 x 3 4 x 1 Rudder Block 2 50 150 Pine Block 1 2 x 9 16 x 1 7 16 20mm Ammo Box 1 25 1051 Wood Turning 20mm Base 1 51 160 PVC Pipe 1 11 16 dia x 3 1 2 Turrets 1 59 173 Fiberglass Screen 2 x 4 Life Raft 4 39 193 Large Pins Man...

Page 38: ...ng items that you may require All of these items are available through your local hobby shop RADIO CONTROL FOR ELECTRIC POWER 2 Channel Radio minimum Battery 7 2V 6 cell nicad 6V Electric motor Dumas stock no 2025 Running Hardware Package Dumas stock no 2370 FOR GAS POWER Not Recommended THANKS We appreciate your confidence in our product as expressed by your purchase of this kit We hope that you ...

Page 39: ...sed with Rudder Arm 3 21 144 6 32 Set Screw Rudder Arm Couplings 1 26 210 Steel Rod 1 8 dia x 7 3 8 w threads and hole Shaft 1 27 283 Brass Tube 3 16 dia x 6 1 4 Stuffing Box 2 23 114 Small Nylon Washer Shaft 1 29 119 Propeller 2 blade 1 1 2 dia P 49 Nylon 1 31 120 Prop Pin 041 dia x 1 2 wire 1 22 131 5 40 Lock Nut 1 29 284 Brass Sheet 032 x 1 1 8 x 1 1 2 Rudder 1 31 101 Coupling 1 8 I D 1 31 103 ...

Page 40: ...PT 212 40 Kit No 1257 DIE CUT PARTS LOCATOR ...

Page 41: ...PT 212 41 Kit No 1257 LASER CUT PARTS LOCATOR ...

Page 42: ...PT 212 42 Kit No 1257 VACUUM FORM PART LOCATOR ...

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