Radio Controlled Rocket Glider Kits
Mig 21 Rocket Glider Kit
The Mig 21 RC Rocket glider kit. It comes with a plastic nose cone, 2.6" white tubing for the body and depron wing and full flying tail surfaces. Construction is slightly more complicated since you have to cut the slot in the tube for the wing after you join the two body tubes. You will need two 10 gram type servos, two 12"-18" servo extensions, a receiver, and a small 500mah single cell lipo battery. You will need a transmitter with delta or elevon mixing. Please refer to the notes on items needed for completion and flying, then read the instructions completely before starting assembly. The assembly photos are for general reference but may not include every step in the manual.
CG location for rocket flight: 7 3/4" forward from the TE of the wing or 6.75" from the LE of the wing, it should be the same point.
Welcome to the world of rocket boosted radio control gliders. This is not a model for a novice RC pilot, but anyone who is comfortable with RC flying of a medium speed model should be fine. Read through the instructions, look at the photos and be sure you understand the step before commiting to cutting or glue.
Mig 21 Rocket glider instructions
Identify all pieces, the kit should contain:
1 wing taped together
1 wing spar(carbon fiber)
1 vertical stabilizer
2 horizontal stabilizers
1 tail pivot rod
1 tail pivot tube
1 tail pivot rataining ring
1 plastic strip for reinforcing ventral fin.
2 ez connectors
2 Body Tubes
1 Spine/canopy piece
1 nose cone
Velcro(for battery and rx/bec attachment)
2 Rail buttons with t nuts/screws or 1 Launch lug
1 landing skid
3M blenderm tape
Notes before starting:
Reference to CA+ means foam safe CA+, normal CA+ will melt the foam! Normally you need to use accelerator to get the CA to set on the foam since there is nothing for it to soak into and activate.
You may use 220-320 grit sandpaper and a sanding block to slightly round the edges of the foam if you prefer that look. It will not markedly impact the flight performance either way. Be very careful and use a light touch, it is very easy to catch the foam on the edge of the paper and tear the foam. Do any sanding before assembly.
Epoxy is not needed in this model. Weight is critical and the model is designed for the thrust and flight loads. Weight in the rear end is bad and will require additional weight in the front of the model.
The basic construction is now complete.
Note: Your radio needs to be configured for Delta mixing, this means that the servo arms will move the same direction during elevator stick movement and opposite for aileron stick movement. Connect your servos to the receiver one in the aileron connection and one on the elevator connection and apply power. Remove the servo arms from the servos. Use a servo arm at least 9/16” long. I use the hole furthest out on the servo arm, to maximize movement. Install the ez links on the outermost hole in the servo arm from the inside of the arm, you may need to enlarge the servo arm hole so that the ez link rotates freely. Zero out any trim settings on the transmitter. Slide the servo arms onto the servos. so that they point down toward the ground.
Flying: See the Instruction/Information link at the top for flying instructions. Be ready on the first few flights to keep the model straight till you have the trims set perfectly for boost and glide.