Ultimate 20-300 10 ARF Assembly Manual Specifications Wingspan: Length: Wing Area: Weight w/o Battery: Weight w/Battery: 38 in (960mm) 41 in (1045mm) 473.5 sq in (30.
Table of Contents Introduction.......................................................................... 2 Using the Manual................................................................. 2 Contents of Kit/Parts Layout.................................................. 3 Covering Colors................................................................... 3 Required Radio Equipment.................................................... 3 Required Tools and Adhesives...............................................
Contents of Kit/Parts Layout Replacement Parts EFL2751 Fuselage EFL2752 Top Wing w/Ailerons, Left and Right EFL2753 Bottom Wing w/Ailerons, Left and Right EFL2754 Tail Set EFL2755 Outer Wing Struts EFL2756 Cowl EFL2757 Canopy EFL2758 Spinner EFL2759 Landing Gear EFL2760 Wheel Pants EFL2761 Axles EFL2762 Wheels EFL2763 Hardware Set EFL2764 Pushrod Set Required Radio Equipment You will need a minimum 5-channel transmitter, receiver, and four sub-micro servos.
Required Tools and Adhesives Tools & Equipment Felt-tipped pen Low-tack masking tape Paper towels Rubbing alcohol Drill bits: 1/16-inch (1.
Warranty Information Warranty Period Horizon Hobby, Inc., (Horizon) warranties that the Products purchased (the “Product”) will be free from defects in materials and workmanship at the date of purchase by the Purchaser. Limited Warranty (a) This warranty is limited to the original Purchaser ("Purchaser") and is not transferable. REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER.
Questions, Assistance, and Repairs Your local hobby store and/or place of purchase cannot provide warranty support or repair. Once assembly, setup or use of the Product has been started, you must contact Horizon directly. This will enable Horizon to better answer your questions and service you in the event that you may need any assistance. For questions or assistance, please direct your email to productsupport@horizonhobby.com, or call 877.504.0233 toll free to speak to a service technician.
Safety, Precautions, and Warnings Hinging the Ailerons As the user of this product, you are solely responsible for operating it in a manner that does not endanger yourself and others or result in damage to the product or the property of others. Required Parts Top wing Bottom wing CA hinge (16) Top ailerons (right and left) Bottom ailerons (right and left) Carefully follow the directions and warnings for this and any optional support equipment (chargers, rechargeable battery packs, etc.) that you use.
mmm 3. Position the hinges in the pre-cut slots in the aileron. Slide the hinges into the aileron up to the mark made in the previous step. mmm 4. Slide the aileron in position with the hinges inserted in the slots of the wing. Check that the end of the aileron is aligned with the wing tip using a straight edge. 8 mmm 5. Make sure the aileron does not bind at the center of the wing. mmm 6. Use a hobby knife with a #11 blade to set the gap between the aileron and wing.
Note: If the control surface is tight against the main surface, it will limit the amount of control throw the surface can achieve. mmm 7. Apply thin CA to the top and bottom of each hinge. Make sure to saturate the hinges, applying the CA to the slot in the hinge so it penetrates fully into the hinge for the best bond between the aileron and wing. 9. Repeat Steps 2 through 8 to attach the aileron to the top wing. You should now be done with the aileron installation. 10.
Aileron Servo Installation Required Parts Top wing Bottom wing Control horn (2) Interconnect horn (4) Aileron servo (2) Silicone clevis retainer (2) Nylon connector backplate (2) Machine screw, 2mm x 4mm (2) 6-inch (152mm) servo extension (2) Lightweight screw lock connector (2) Servo linkage, 2.5-inch (62mm) (2) Required Tools and Adhesives Medium CA Side cutters Low-tack tape Drill bit: 1/16-inch (1.5mm) Felt-tipped pen mmm 1. Slide the control horn into the pre-drilled holes in the aileron.
mmm 2. Use a hobby knife to trim the covering from the slot in the aileron. Leave the covering on the top for aesthetic purposes. Use medium CA to glue the interconnect horn in the aileron. Make sure to center the horn in the aileron before the CA fully cures. m 4. Secure a 6-inch (152mm) servo extension to the aileron servo so it will not unplug inside the wing. Hint: Use a piece of string or some tape to secure the two plugs together so that they cannot pull apart inside the wing. m 5.
m 6. Use the string to pull the extension through the hole at the center of the bottom wing. m 7. Position the servo in the opening. Use a pin drill and 1/16-inch (1.5mm) drill bit to drill the holes for the servo mounting screws. Use care not to slip and puncture the covering on the top of the wing. Hint: Use low-tack tape to keep the ailerons from moving during the servo installation. m 8. Apply 2–3 drops of thin CA into each hole to harden the surrounding wood.
9. Repeat Steps 1 through 8 for remaining control horns and servo. m 10. Use a pin drill and 1/16-inch (1.5mm) drill bit to enlarge the hole that is 1/2-inch (13mm) from the center of the servo horn. E-flite Ultimate 20-300 Assembly Manual m 11. Use a hobby knife to remove the webbing from the underside of the servo horn so the connector backplate will rest flush against the horn. m 12. Use side cutters to remove the unused arm from the servo horn.
m 13. Slide the lightweight screw lock connector into the hole drilled back in Step 10. m 16. Attach the clevis to the outer hole of the control horn and slide the retainer onto the clevis to keep it secure. m 14. Use the connector backplate to secure the connector. m 17. Slide the linkage through the hole in the lightweight linkage connector and attach the horn to the servo. m 15. Slide a clevis retainer onto the clevis of the 2.5-inch (62mm) servo linkage.
Note: The servo horn should be installed parallel to the hinge line to produce the correct linkage geometry. Important: The suggested digital servos will require programming before setting the control throws. This will be covered in the manual before the throws are set. m 18. Use a 2mm x 4mm machine screw and #1 Phillips screwdriver to secure the linkage to the connector.
2. Slide the stabilizer into the slot at the rear of the fuselage. Slide the stabilizer forward, then align it sideto-side with the fuselage. 3. Measure from each wing tip to each stabilizer tip. The distances on the right must match those on the left. Reposition the stabilizer to achieve equal measurements. A A A=A 4. Stand back and view the aircraft from the rear. The stabilizer must be parallel to the bottom wing.
5. Once aligned, use a felt-tipped pen to trace the outline of the fuselage onto the top and bottom of the stabilizer. 6. Remove the stabilizer from the fuselage. Use a hobby knife with a new #11 blade to trim the covering slightly INSIDE the lines drawn on the stabilizer. Use light pressure so you do not cut into the underlying wood. Remove the covering from the inside of the cut lines on the top and bottom of the stabilizer.
Hint: To avoid leaving the marks of the lines from the pen where the location marks are made on the stabilizer, use alcohol and a paper towel to remove the lines from the top of the stabilizer first. Then slide the stabilizer in and wick thin CA on the top left and right joint first, using the bottom lines for the alignment. Now use the alcohol and paper towel to remove the lines from the bottom and glue those joints last. 7.
Hinging the Rudder and Stabilizer Required Parts Elevator (left and right) Tail wheel assembly CA hinge (10) Control horn backplate Rudder Fuselage Control horn Required Tools and Adhesives Medium CA Hobby knife 6-minute epoxy Mixing cups Paper towels Felt-tipped pen Thin CA Mixing sticks Rubbing alcohol m 2 Slide the three hinges into the elevator, using the line to center them properly. Install the control horn in the stabilizer on the bottom side.
m 4. Slide the hinges in the slots in the stabilizer. 20 6. Position the elevators so the gap between the stabilizer tip and the balance tabs of the elevators are equal. Check the operation of the elevator to make sure it does not bind against the stabilizer. 7. Mix a small amount of 6-minute epoxy and apply it inside the hole in the elevator that the joiner wire fits into. Follow the previous steps to position the stabilizer before the epoxy cures.
9. Use medium CA to glue the tail wheel assembly into the slot at the bottom of the rudder. 10. Mark four CA hinges and install them in the slots in the rudder as shown. E-flite Ultimate 20-300 Assembly Manual 11. Attach the rudder to the fin using the hinges. Remember to use a hobby knife to set the gap between the rudder and fin. Apply thin CA to each side of the hinges.
Rudder and Elevator Servo Installation Required Parts Fuselage Servo (2) Control horn Silicone clevis retainer (2) Control horn backplate Nylon connector backplate (2) Machine screw, 2mm x 4mm (2) 9-inch (228mm) servo extension 12-inch (305mm) servo extension Lightweight screw lock connector (2) Servo linkage, 4-inch (98mm) (2) Required Tools and Adhesives Medium CA Side cutters Low-tack tape Drill bit: 1/16-inch (1.5mm) Felt-tipped pen 22 m 2.
Hint: Use a piece of string or some tape to secure the two plugs together so that they cannot pull apart inside the fuselage. mm 4. Position the servo in the opening. Use a pin drill and 1/16-inch (1.5mm) drill bit to drill the holes for the servo mounting screws. Apply 2–3 drops of thin CA into each hole to harden the surrounding wood. This will keep the screws secure in the holes. Install the servo using the screws provided with the servo. m 6.
m 7. Secure the link using a 2mmx 4mm machine screw and a #1 Phillips screwdriver. Receiver and Landing Gear Installation Required Parts Fuselage assembly Main landing gear (right and left) Receiver #4 washer, silver (4) Hook and loop material 6-inch (152mm) servo extension (2) Socket head screw, 4-40 x 1/2-inch (4) Required Tools and Adhesives Ball driver: 3/32-inch 24 Threadlock 1. Use hook and loop material to install the receiver inside the fuselage as shown.
2. Use four 4-40 x 1/2-inch socket head screws and four #4 washers to attach the main landing gear to the fuselage. Use a 3/32-inch ball driver to tighten the screws.
2. Attach the motor to the firewall using four 4-40 x 3/8-inch socket head screws and four #4 washers. Tighten the screws using a 3/32-inch ball driver. 4. Use hook and loop material to secure the speed control inside the fuselage in the position shown. Also secure the switch from the speed control inside the fuselage. A 3-inch (76mm) servo extension will be required to connect the speed control to the receiver.
5. Secure a small square of hook and loop material inside the fuselage. This is done to keep the strap that secures the battery from falling into the fuselage. 7. Check the operation of the motor at this time. It should rotate counterclockwise when viewed from the front of the aircraft. If not, follow the instructions provided with your speed control to correct the situation. Note: Never check the motor rotation on the bench with the propeller installed. The plane could move and cause serious injury.
Important Information About Your Propeller 10. Slide the propeller assembly onto the motor shaft. With a gap of 3/32-inch (2.5mm) between the spinner and cowling, tighten the adapter to secure it to the motor shaft. 11. Attach the spinner cone to the spinner backplate using two 2mm x 8mm sheet metal screws and a #1 Phillips screwdriver. Make sure the propeller does not contact the spinner cone when it is installed.
Upper Wing and Canopy Installation Required Parts Fuselage Top wing Bottom wing Canopy 2mm nut (2) 2mm washer (4) Interplane strut (2) Machine screw, 2mm x 20mm (8) Linkage, 7.5-inch (190mm) (2) Machine screw, 2mm x 6mm (2) Pushrod connector backplate (2) Lightweight pushrod connector (2) 2mm x 10mm machine screws (2) Required Tools and Adhesives Phillips screwdriver: #1 Drill bit: 1/16-inch (1.5mm) Adjustable wrench, small m 2. Install the lightweight pushrod connector to the interconnect horn.
3. Use a pin drill and 1/16-inch (1.5mm) drill bit to poke the covering to access the screw holes for the interplane struts. 4. Use the following image to orient the interplane struts for installation. 5. Use four 2mm x 20mm machine screws and a #1 Phillips screwdriver to attach the interplane struts to the bottom wing. Install the bottom wing to the fuselage at this time.
6. With the bottom wing installed, attach the top wing to the cabane struts using four 2mm washers, two 2mm nuts and two 2mm x 10mm machine screws. Use a small adjustable wrench and a #1 Phillips screwdriver to secure the screws. m 8. After sliding a clevis retainer onto the clevis of the 7.5-inch (190mm) linkage, slide the linkage through the pushrod connector. m 9. Attach the clevis to the interconnect horn of the top wing and slide the clevis retainer onto the clevis. 7.
m 10. Position both ailerons in their neutral positions. Use a 2mm x 6mm machine screw and #1 Phillips screwdriver to secure the linkage. 11. Repeat Steps 8 through 10 to connect the remaining top and bottom ailerons. Control Throws 1. Turn on the transmitter and receiver of your Ultimate 20-300. Check the movement of the rudder using the transmitter. When the stick is moved right, the rudder should also move right. Reverse the direction of the servo at the transmitter if necessary. 2.
Control Horn Length This length is also very critical. The closer the pushrod attachment is to the surface the LESS mechanical advantage you have on the surface. In the case of the Ultimate these lengths have been set for you. In general, practice never set the control horn any shorter than it needs to be for the surface to have full deflection at the servo's full travel. Travel Adjust The travel volume of the servo is not only controlling how far the servo travels.
Final Control Throws Programmer Servo Throws Ailerons Up 11/16-inch (16mm) Down 9/16-inch (13mm) Elevator Up 2-inch (50mm) Down 2-inch (50mm) Rudder Up Down 2 3/4-inch (70mm) 2 3/4-inch (70mm) Ailerons Up High Rate 7/8-inch (22mm) Up Low Rate 5/8-inch (16mm) Down 3/4-inch (19mm) Down 1/2-inch (20mm) 35% Expo 20% Expo Elevator Up High Rate 2 1/4-inch (57mm) Up Low Rate 1 3/4-inch (44mm) Down 2 1/4-inch (57mm) Down 1 3/4-inch (44mm) 35% Expo 20% Expo Rudder Up High Rate 3
Center of Gravity An important part of preparing the aircraft for flight is properly balancing the model. Caution: Do not inadvertently skip this step! The recommended Center of Gravity (CG) location for the Ultimate 20-300 is 3 1/8–3 1/2-inch (80–90mm) back from the leading edge of the top wing. Mark the location for the Center of Gravity on the bottom of the top wing in the center as shown.
Range Test Your Radio 1. Before each flying session, be sure to range check your radio. This is accomplished by turning on your transmitter with the antenna collapsed. Turn on the receiver in your airplane. With your airplane on the ground and the engine running, you should be able to walk 30 paces (approximately 100 feet) away from your airplane and still have complete control of all functions. If not, don’t attempt to fly! Have your radio equipment checked out by the manufacturer. 36 2.
2008 Official AMA National Model Aircraft Safety Code GENERAL 1) I will not fly my model aircraft in sanctioned events, air shows or model flying demonstrations until it has been proven to be airworthy by having been previously, successfully flight tested. 2) I will not fly my model higher than approximately 400 feet within 3 miles of an airport without notifying the airport operator. I will give right-of-way and avoid flying in the proximity of full-scale aircraft.
Building and Flying Notes 38 E-flite Ultimate 20-300 Assembly Manual
Building and Flying Notes E-flite Ultimate 20-300 Assembly Manual 39
© 2008 Horizon Hobby, Inc. 4105 Fieldstone Road Champaign, Illinois 61822 (877) 504-0233 13465 horizonhobby.com E-fliteRC.
