Table of Contents
Advertisement
Quick Links
Stock tail design
• Comes 70% prebuilt, requiring very little sanding.
• Control surfaces are preshaped and ready for covering.
V-tail design
(optional)
• Wing features balsa sheeting over foam core.
• Meets all requirements for Quickie 500 racing.
Mid-tail design
(optional)
• Can be customized with
three different tail
configurations
© Copyright 1993, Hobbico, Inc.
TM
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Hobbico Viper
Summary of Contents for Hobbico Viper
- Page 1 • Control surfaces are preshaped and ready for covering. • Wing features balsa sheeting over foam core. Stock tail design • Meets all requirements for Quickie 500 racing. • Can be customized with V-tail design three different tail (optional) configurations Mid-tail design (optional) © Copyright 1993, Hobbico, Inc.
-
Page 2: About This Manual
1. Engine Size: configuration and requires some additional 3/16" balsa to If a .25 size engine is to be used for powering your Viper, no complete. additional reinforcement is required to the nose. You may skip the steps with the checkered flag ( ). -
Page 3: Radio Equipment
Getting Ready for Flight Your Hobbico Viper is ready for takeoff in as little as 15-20 hours. Your hobby dealer can help you decide what accessories you’ll need for flight. You will need glow fuel with a 10-15% nitro blend to keep your engine performing at its peak...and your Viper will have the power to perform the... -
Page 4: Fuselage Preparation
Installation of blind nuts FUSELAGE PREPARATION Marking firewall for engine mount 3. Using a file or a Moto-Tool™, remove the triangle stock around the holes drilled through the firewall. This creates a flat surface to mount the blind nuts against. Install #6-32 blind nuts into the holes and apply thick CA to secure them in place. - Page 5 Opening the blind nuts Cutting fiberglass cloth 9. Using a hobby knife, remove the fiberglass covering the bolt holes. Pick the wax out of each of the blind nuts. 6. Cut (5) pieces of 2 oz. fiberglass cloth as shown. Mark Drilling hole for throttle rod tube the center of pieces A, B, and D.
- Page 6 Installation of throttle rod ASSEMBLY OF WING Making an alignment peg 12. Roughen the entire throttle rod tube using sandpaper. Slide the tube through the hole in the firewall and the first bulkhead. Slide the rod into the tube and direct the rod straight to the servo arm with as little bending as possible.
-
Page 7: Wing Panel Assembly
Setting wing dihedral Fiberglassing the wing joint 4. Use a piece of 5/8" (16mm) or 1" (25mm) scrap balsa to block up one wing panel. This will account for the dihedral 7. Apply 30- or 45-minute epoxy and thoroughly saturate required for the wing. - Page 8 Trimming the hold down dowels Applying the fiberglass cloth 9. Start with the bottom of the wing first. Mark the center of the fiberglass panels cut in the previous step. Apply the 24" (610mm) wide piece first and then the 18" (460mm) wide piece over the top of it, making sure that the center marks 12.
- Page 9 Marking the aileron servo hole Drilling for the wing hold down bolts 14. Using the aileron servo as a reference, mark and cut a hole in the center section of the wing, starting the hole 3-3/4" (95mm) to 4" (102mm) from the leading edge of the wing. Make sure that the position chosen does not allow the aileron servo to interfere with the throttle servo.
- Page 10 Installation of vertical stabilizer INSTALLATION OF CONVENTIONAL TAIL SURFACES Important: Make sure this is the tail configuration you have chosen to use. If it is not, turn to page 11 for mid-tail or page 13 for V-tail. Marking the horizontal stabilizer 3.
- Page 11 Relocating the antenna tube MID TAIL DESIGN (Follow this section for mid-tail only) Trim the horizontal stabilizer 1. Carefully remove 1/2" (13mm) of balsa from the trailing 6. Drill a 1/8" (3mm) hole and install the antenna tube and edge of the existing stabilizer. Using the elevator template on secure using thick CA.
-
Page 12: Installing The Rudder Pushrod
Relocating the antenna tube the joint. Once the fins are tacked into place, go over the joint again with thick CA glue. Cut the 1/4" (6mm) triangle stock provided into (4) pieces 2-3/4" (70mm) long. Install the triangle stock along each joint to reinforce the joints. Bevel the front and rear of the triangle stock to eliminate drag. - Page 13 3. Trial fit the two stabilizers together and make sure the trailing edge is straight. Once the trailing edge is straight, glue 11. Do not permanently install the control surfaces until the two stabilizers together. after the Viper is covered. - 13 -...
-
Page 14: Install The Antenna Tube
Reinforce the stabilizer joint make sure the distance from the trailing edge of the wing tip to the trailing edge of the stabilizer is exactly the same on each side. Check to make sure it is square to the wing and tack glue the stabilizer into place using thin CA glue. -
Page 15: Pushrod Installation
Trimming the control horns PUSHROD INSTALLATION Trimming the servo tray 3. Cut both of the control horns as shown. The smaller version will be the elevator control horn and the one with 2 holes will be the rudder control horn. Note: This is for the conventional tail configuration. - Page 16 Installation of rods Installation of elevator control horn 9. Set the elevator control horn in place, centered on the hole in back of the fuselage, and mark the hole locations with a pen. Drill 5/64" (2mm) holes at the marks. Install the control horn using (2) 2mm screws and the control horn backing plate.
-
Page 17: Finishing The Fuselage
Slot for rudder pushrod FINISHING THE FUSELAGE Straightening the fuselage 8. Make a slot 1" (25mm) long starting 1/4" (6mm) behind the leading edge of the stabilizer. This slot should go through the triangle stock and the stabilizer. 1. In some cases the sides of the fuselage bow in slightly. If this happens, simply install a couple of scrap pieces of balsa Installation of rudder pushrod to return the fuselage sides to their original shape. -
Page 18: Assemble The Fuel Tank
After covering is complete, glue is about 4 oz., which is perfect for .19 to .25 engines. If you plan to race the Viper, you will want to replace this with a the skid in place using thick CA or epoxy. -
Page 19: Finishing The Model
It will take about 2 rolls of MonoKote® to cover the Viper. Use your imagination and you can create a very attractive airplane. Once the Viper is covered, re-install all of the fittings. Cover the servo access hole and the fuel tank compartment hole with clear tape or 10. -
Page 20: Radio Installation
70mm) back from the leading edge of the wing. This is a good, safe balance range. You may choose to try different balance points to change the performance of your Viper, but do not move the balance point more than 1/4" (6mm) at a time. -
Page 21: Before You Fly
Charging the batteries sure the fuel tank is full. Because there is no tail whee,l you will find it difficult to taxi the Viper. You should start the engine Follow the battery charging procedures in your radio instruction and carry it to the runway for take-off. While an assistant holds manual. - Page 22 VIPER TEMPLATES Recess here Drill 5/64" (2mm) hole Bevel the Leading Edge for interlock Mid-Tail Elevator Make (2) from 3/16" (5mm) Hard Balsa Drill 5/64" (2mm) Holes Taper to 1/16" (1.6mm) Mid-Tail Vertical Fin 3/16" (5mm) Hard Balsa Grain direction...
- Page 23 V-Tail Fuselage Template Taper to 1/16" (1.6mm) Bevel the Leading Edge Drill 1/16" (1.6mm) Holes - 23 -...
- Page 24 Servo Tray V-Tail Crutch Make (4) Bottom Trim the existing servo tray to size for mounting behind bulkhead #4. Surface Throw Gauges Cut out the gauge and Tape or glue the throw gauge to a piece of cardboard to keep it from flexing. IMPORTANT The threaded coupler will need to be soldered onto the end of the throttle rod.
Need help?
Do you have a question about the Viper and is the answer not in the manual?
Questions and answers