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3D Hobby Shop Extra 300, Assembly Manual, Page: 1 / 38

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3DHobbyShop.com

  Extra 300 SHP 87” Assembly Manual 

 

Thank you for purchasing this 3DHobbyShop ARF RC aircraft.  If you have any issues, questions, 
concerns or problems during assembly, please contact our tech department at: 
 

[email protected]

 or 1-830-990-6978 10am-5pm Central M-F 

 

SAFETY in Assembly 

During assembly of this aircraft, you will be asked to use sharp knives, hot irons, and hobby adhesives.  
Please follow all safety procedures recommended by the manufacturers of the products you use, and 
always follow these important guidelines: 
 
ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power tools.  Safety 
glasses are the best way to protect your eyes. 
 
ALWAYS protect your body, especially your hands and fingers when using adhesives, knives, or tools, 
especially power tools.  Do not cut toward exposed skin with hobby knives.  Do not place hobby knives on 
tables or benches where they can roll off or be knocked off.   
 
ALWAYS have a first-aid kit handy when working with adhesives, knives, or tools, especially power tools.   
 
ALWAYS keep hobby equipment and supplies out of the reach of children. 
 

SAFETY in Flying 

ALWAYS fly your aircraft in a safe area, away from spectators. 
 
ALWAYS fly your aircraft in a safe manner, within your control. 
 
NEVER fly too close to yourself. 
 
ALWAYS wear eye protection while operating your model aircraft. 
 
ALWAYS keep your hands and body clear of propellers. 
 
ALWAYS observe lipoly battery safety procedures. 
 
ALWAYS handle gasoline in a safe manner. 
 
ALWAYS perform a ground test and range check of your radio system before flying. 
 

REQUIRED ITEMS 

 
30 Minute Epoxy Glue (

NOT

 5-minute Epoxy) 

Polyurethane Glue for hinging if desired 
Hobby Knife 
Soldering Iron 
Phillips Screwdriver 
Set Metric Allen Wrenches 
Small Pliers 
Wire Cutters 
Rubbing Alcohol 
Paper Towels 
Blue Loctite thread-locking adhesive 
Dremel-type rotary tool 
Small adjustable wrench or wrench set 

Summary of Contents for Extra 300

Page 1: ...nives Do not place hobby knives on tables or benches where they can roll off or be knocked off ALWAYS have a first aid kit handy when working with adhesives knives or tools especially power tools ALWAYS keep hobby equipment and supplies out of the reach of children SAFETY in Flying ALWAYS fly your aircraft in a safe area away from spectators ALWAYS fly your aircraft in a safe manner within your co...

Page 2: ...the process we also made the commitment to offer the highest quality component package and build experience possible This includes pin point hinges a full hardware package including ball links control rods a preinstalled canopy no gluing pre assembled firewall pre mounted internal fastener cowling and super strong phenolic control horns We ve done our absolute best to ensure not only a simple asse...

Page 3: ...inkles may appear and disappear Wrinkles may be removed with the gentle application of heat to the covering material on your airplane using an iron and or heat gun Apply the heat gently the covering material will shrink as you apply the heat and this will remove the wrinkles BE CAREFUL Too much heat applied too quickly can damage the covering either by causing it to pull away from the wood at seam...

Page 4: ...levator In this photo we have used tape as a depth gauge to keep from going any deeper than 1 4 inch Open each hole with the drill bit and then use a cotton swab to apply Vaseline to the center hinge portion of the hinge point to protect it from the glue Apply the Vaseline only to the center of the hinge point where the two halves hinge together We have also used oil applied with a syringe but the...

Page 5: ...de of the holes in one surface In the following photo we are using the end of a nylon zip tie to apply the epoxy inside the hole Insert the hinge points into one side and carefully align them so that they sit perfectly centered in their holes ...

Page 6: ...are properly centered and aligned and set the surface aside to allow the glue to cure Once the glue has cured repeat the procedure to install the opposite surface Push the other surface up tight against the first one they should almost touch Please see photos Use paper towel and rubbing alcohol to clean up any excess epoxy ...

Page 7: ... needs to be sanded to fit into the hinge pocket to avoid a mess when inserting the adhesive 2 Lightly wet each hinge pocket with water prior to inserting the hinges We find a wetted Q tip works best 3 After all hinges are installed and the surfaces joined be sure to clean the hinges several times Sumo adhesive expands in the hole and needs to be cleaned from the hinge area with denatured alcohol ...

Page 8: ...is method gives a clean cut and also seals the edges of the covering at the cut line You can also use a hobby knife if you cannot use a soldering iron for this job but the iron is recommended 1 First locate the control horn location in each control surface 2 Cut away the covering over the two slots 3 Assemble the control horns as shown and temporarily push the horn into the slots in the control su...

Page 9: ...9 5 Remove the horn and use the soldering iron to trim the covering just inside the square mark you made with the pencil ...

Page 10: ...of the control surface Install the horn Wipe up excess epoxy with a paper towel and alcohol Temporarily install a 3mm bolt through the bolt holes to ensure proper alignment of the two horn halves Allow the epoxy to cure Rudder control horn The rudder control horn is installed in a similar fashion except that it is double sided Remove the covering on both sides of the rudder over the slots as you d...

Page 11: ...er Use alcohol to clean any excess epoxy and temporarily insert two 3mm bolts through the holes in the horn to ensure alignment while the glue cures Trim the rudder horn outer holes away as on the other horns if necessary to match the width of your rudder servo horn ...

Page 12: ...e necessary locations in the fuselage as shown NOTE The large holes in the bottom of the fuselage are for the canister exhaust outlet and cooling cover You do not need to remove this covering for electric power applications and it is optional for gas engines with stock or pitts mufflers ...

Page 13: ... onto the stud and screw the stud and ball joint into the rudder as shown Allow the glue to dry Take the tail wheel assembly tighten all set screws on the assembly using blue Loctite to lock the threads Attach the tail wheel assembly to the bottom of the fuselage as shown using the supplied 3mm bolts 3mm nuts are already installed inside the fuselage open small holes in the covering as needed Bend...

Page 14: ...gh fields or rough flying Replacement tailwheel assemblies are available and we have provided a hatch on the airplane as shown below for access to the tailwheel mounting plate This hatch is also useful if you wish to add tail weight to your aircraft ...

Page 15: ...r 3mm screws Locate the wheel axles and nuts and attach to the landing gear as shown Install the inner wheel collar wheel and outer wheel collar Use a dremel tool with cutoff wheel to trim away the excess axle length as needed CAUTION Protect your eyes with safety glasses while using the dremel tool ...

Page 16: ...the landing gear cover plate onto the bottom of the landing gear mounting area The wheel pants are molded with a narrow axle slot We suggest widening the axle slot in the pant with a dremel tool as shown This allows the pant to slip over the axle and you can undo the 2 pant mounting bolts to easily remove the pant for transport or rough field operation ...

Page 17: ...17 Slip the pants down over the wheels and axles fasten to the landing gear legs with 2 3mm bolts Pull Pull cables The pull pull cables for the rudder are assembled as shown in the following diagram ...

Page 18: ... get the line tight and also run through the initial link a second time Instead I tighten and crimp the initial crimp then run the second crimp doubled This is especially helpful when rigging the final two crimps while setting tension Assemble the pull pull cables at the rudder end first as shown and feed the cables through the slots in the fuselage and pull them to the front of the fuselage Cente...

Page 19: ...inder engines This manual shows the installation of a DL 50 Other engines are similar Templates are included to locate the mounting holes for the DA 50 same as DL 50 although you may need to very slightly slot the holes to fit the DL and 3W engines The correct distance between the firewall mounting surface and the prop mounting surface on the front of the engine is 6 and inches Tape the pattern in...

Page 20: ...20 Using threadlocker on all mounting hardware attach your motor to the firewall It is a good idea to use large washers on the back of the firewall to spread the load Loctite all mounting fasteners ...

Page 21: ...e cowling I used a small ball link steel pushrod and three medium length zip ties The zip ties create a housing of sorts for the pushrod to run in Very simple and bullet proof You have several options for mounting your throttle servo We have provided a location in the bottom of the engine mounting box behind the firewall This hole is cut for a full size servo We have also provided adaptor plates y...

Page 22: ...end a two line system for fuel installed as follows Assemble the fuel tank as shown using small nylon zip ties as hose clamps to retain the flexible fuel tubing onto the rigid metal tubing Place a piece of foam rubber under the tank to isolate the tank from vibration and install the long nylon ties through the slots in the tray as shown ...

Page 23: ...23 The fuel feed line runs from the tank to either a Du Bro gasoline filler valve or a Y connector and fuel dot and then to the carburetor ...

Page 24: ...aerobatics I run the fuel vent line aft of the back end of the fuel tank I ve found the easiest method is to use small zip ties to create a housing for the vent lines to run in See photos Run the vent line into the cowl and out the bottom as shown ...

Page 25: ...The Extra includes pre fabricated mounts for the MTW TD 75K short canister muffler available from Desert Aircraft I Slide the canister part way into the canister tunnel you will need to twist the can as it goes in to clear the fuselage former ...

Page 26: ...and then F4 Note that you will need to trim F3 to clear the landing gear braces as needed to allow F3 to slide fully forward into position When you have F3 and F4 fully into position as shown tack them in place with CA glue and then apply epoxy to permanently mount them ...

Page 27: ...ave used a Medium Drop flex header from Desert Aircraft to attach the DL 50 engine to the canister Pre drill the screw holes as shown and use 6 wood screws to attach the canister cover plate and 4 screws to attach the outlet plate ...

Page 28: ...and work in a well ventilated area Scott s Tip I make a simple template from a piece of card stock to assist in cutting the cowl First take the card stock and hold it under the motor with the end against the firewall Trace the shape of the cylinder head and muffler if not using a canister as shown and also trace the alignment tabs to help align the pattern Use scissors to cut out this shape and ad...

Page 29: ...s from the bottom through the alignment tabs If you need to adjust your engine location to correct for cowl to spinner fit this is accomplished by removing the engine to firewall bolts and using the dremel tool to slightly elongate the holes into slots If you need to space the spinner forward for clearance to the cowl use washers in between the engine and firewall as necessary to achieve a 1 8 to ...

Page 30: ...ted by the servo arm manufacturer We also use a dab of silicone adhesive on the servo arm screw to lock it in place against vibration Assemble the elevator pushrod as shown The elevator pushrods are the shorter of the included pushrods The longer ones are for the ailerons Screw the pushrod into the ball links at least 5 6 threads Assemble the pushrod onto the servo arm and control horn as shown us...

Page 31: ...e and feed the wire through the tube as shown Install the horizontal stabilizers onto the fuselage using the carbon fiber tube spar The horizontal stabs are retained by two screws on each side as shown For a permanent stab installation use threadlocker on these screws If you wish to allow the stabs to be removed for transportation you must inspect these screws frequently as vibration will loosen a...

Page 32: ...Remove the covering over the servo openings in the bottom of the wings Attach an 18 extension to the aileron servo and secure the extension as before A pull string is provided to help guide the extension through the wing ...

Page 33: ...ng Attachment The wing attaches to the fuselage with two nylon thumb screws per side Extra spare thumb screws are included in the kit Your carbon fiber wing tube is a snug fit into the wings and fuselage This provides additional strength and fatigue resistance As a result you may need to periodically lubricate your wing tube We ...

Page 34: ...er Sport Plus unit to be perfect for this airplane We have provided switch locations for two full size switch on each side of the fuselage as well as a 6mm hole for a Smart Fly flag style safety switch if desired We also mount our fuel filler or fuel dot in this area as shown Electric Power Installation The Extra flies extremely well as an electric Recommended power system Hacker A60 18L motor Cas...

Page 35: ...ox open and we recommend making another hole the same size in the bottom by expanding the throttle servo mounting hole this will allow air to enter the fuselage You will need an air exit as well Make this by removing some of the covering on the bottom of the fuselage behind the wing We typically remove 2 squares but you can remove more as needed to keep your batteries cool Your kit includes baffle...

Page 36: ...t very sensitive to small CG changes Throws are given in degrees both directions i e 45 degree means 45 degrees up and 45 degrees down and millimeters measured at the rear of the surface 120mm means 120mm up and 120mm down Throws High Ailerons 50 degrees or 120mm 70 expo Elevator 70 degrees or 150mm 85 expo Rudder 45 degrees or 170mm 70 expo Throws Low Ailerons 28 degrees or 65mm 30 expo Elevator ...

Page 37: ...ing with the SFGs installed it is possible to scrape them if you dip a wing on landing For this reason we recommend protecting the bottom edge of the SFG with some clear packing tape Spare SFGs are also available ...

Page 38: ...38 ...

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