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OMICRON
Our latest iteration of precision indoor pattern F3P style design! The omicron was born to approach a goal of advancing the state of
the art in terms of easily attainable performance. The Omicron provides a large fraction of the performance of the best F3P models,
for a small fraction of the effort and cost.
Please read and understand all steps to these instructions before beginning assembly. This plane is not a toy and is
potentially dangerous to operate. Children should not operate this aircraft without adult supervision. To start assembly,
gather the required electronic hardware and building supplies. You will need some foam-safe glues, and optional paint.
Look for the recommended electronic hardware at the end of these instructions and painting tips in that section.
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Summary of Contents for Buzzard Models OMICRON
- Page 1 OMICRON Our latest iteration of precision indoor pattern F3P style design! The omicron was born to approach a goal of advancing the state of the art in terms of easily attainable performance. The Omicron provides a large fraction of the performance of the best F3P models, for a small fraction of the effort and cost.
- Page 2 Supplies and tools - We like the BSI Foam-Cure for all foam to foam joints. For basically everything else, we use the BSI Super Gold Plus medium viscosity foam safe CA (cyanoacrylate) glue, with a BSI-301 extender tip. Between uses the extender tip can be closed with a bit of masking tape.
- Page 3 Kit contents-...
- Page 4 Assemble top and bottom fuselage - Glue the top and bottom fuselage halves together. This is best done over some waxed paper. I like to use Foam-Cure for this, and the excess can be cleaned up with some denatured alcohol on a paper towel. Denatured alcohol can also be used to thin the Foam-Cure as desired.
- Page 5 Trim Parts - With a sharp hobby knife, remove the extra foam and tabs from all of the parts. Smooth any tabs that are visible when done.
- Page 6 Hinge beveling - The hingelines are cut most of the way through, the material left forms a great hinge. However, you need to add a little clearance to the opposite side (bottom) to ensure full defletion. Fold the hinges open over the sharp edge of a table or board to support the foam, hinge side down.
- Page 7 Picture of hinge flexed closed to 45 degrees - Flex the control surfaces up and down and verify free movement. Sand more clearance as necessary to allow full movement. Do the rudder, elevator, and aileron hinges the same way.
- Page 8 Empennage assembly - Wipe all carbon rods down with a paper towel and denatured alcohol. Most carbon comes from the factory with a residue. With the elevator and rudder hinges beveled and freely flexing, dry fit the carbon fiber reinforcements in their slots, and conservatively apply a foam safe CA glue with an extender tip.
- Page 9 Wing assembly - Working on wax paper, glue the right and left wing halves together. Add the precut 1.2mm x 18” carbon mainspar, and the 0.8mm x 10.6875” aileron trailing edge and 0.8mm x 3.5” aileron horn reinforcement. All carbon lengths given in these instructions are approximate and for reference only.
- Page 10 Aileron Horn Installation - Dry fit the aileron horns before gluing with CA. Make sure the horn pushrod holes are directly above the centerline of the hinge.
- Page 11 Painting- You can optionally paint now, after the covering is in place, or both as shown below. It is easier to do it now. Airbrushing is the best way to paint, alcohol or india inks are ideal, basic acrylic paint thinned one-to-one with denatured alcohol works great through an airbrush.
- Page 12 Painting - This Rudder and elevator were painted before and after covering.
- Page 13 Wrinkle your mylar - This film is normally "wrinkled", unpackage your film, form into a ball with your fingers, repeatedly compressing and releasing many times until a uniform "wrinkle" pattern is formed in the film. This provides a uniform surface finish free of small wrinkles or other defects, helps prevent the film from resonating with airframe vibrations, and provides additional visibility by reducing the transparency of this very clear film.
- Page 14 Covering - The covering goes on one side only, make sure the hinge sides are down. So the covering goes on the top of the wing and stabilizer, and on the RH side of the vertical fuselage and tail. Layout and space where your parts will fit before applying glue. One part at a time, remove each from the covering film, and very lightly mist one side with 3M 77 spray adhesive.
- Page 15 Trim the covering - With the parts still upside down, trim around their perimeters with a new sharp hobby knife blade over a cutting mat.
- Page 16 Painting - Here is an example of a similar plane that was painted after covering with alcohol ink though an airbrush.
- Page 17 Optional Decal Installation - When the parts are still flat on the bench makes a great time to add decals, if you can resist gluing the airplane together for a while. Please refer to the full decal instructions later in these instructions.
- Page 18 Assembly - Glue the middle fuselage in place. Install the two 0.8mm carbon longerons, they just float over the main wing spar.
- Page 19 Lower fuselage install - dry fit, and then glue with your glue of choice. Install the 0.8mm x 18.312” lower fuselage longeron. (it is not shown in this picture)
- Page 20 Bracing - Install the ten angled 0.8mm fuselage braces, and right and left 0.8mm main spar brace. There should be small notches at each end of these braces to guide the installation.
- Page 21 Aileron Bracing - Install 0.5mm aileron bracing. Tie ends together and put a drop of CA on it, trim ends carefully.
- Page 22 - Glue 0.8mm x 12.5” main gear legs into place, install 0.5mm x 6.75” 0.5mm spreader with two pieces of Landing gear .046” x .5” heatshrink. The entire gear assembly including installing the wheel pants is best done while the airframe is still securely flat on the table.
- Page 23 Rear gear braces - Install 0.5mm x 5.5” rear gear braces and wheel pants. You may want to check your alignment of the wheelpants and gear legs by temporarily flipping the airframe over allowing it to sit naturally on the gear, before final gluing.
- Page 24 Assemble servo arms - Locate the composite servo arms and the nylon straight servo arm from the servo hardware kits. Sand both mating surfaces flat with 120 grit sandpaper and clean with alcohol. There are two holes in the composite arm that correspond with holes in the nylon arm, pin with two pieces of 0.8mm carbon, through a piece of wax paper into a block of foam or otherwise pinnable substrate.
- Page 25 Aileron servo install - Test all servos before installation! Cycle them multiple times to ensure that they are good before permanent installation. With everything still flat on the table, glue the 2.2g aileron servo into place, use Foam-Cure, CA can easily wick into the servo seams and glue the gears or shaft in place.
- Page 26 Rudder and elevator servo install - With everything still flat on the table, glue the two 1.7g rudder and elevator servos into place. The forward servo is the rudder servo, it’s output shaft should be aft. The elevator servo’s output shaft should also be aft to align with the hole in the fuselage for the horn to pass to the topside of the fuselage.
- Page 27 Assembly stand - assemble the provided 6mm depron assembly stand as shown, low temp hot glue makes quick work of this. The end with the widest gap between the uprights is the forward end. The clearance is for the aileron pushrods. If you have access to some thicker foam of any type, a more sturdy assembly stand will make working on the aircraft much easier.
- Page 28 Upper fuselage - Place the assembled lower fuselage right side up on the fuselage stand. Glue the upper fuselage in place. Glue in the 0.8mm x ~20.5” upper fuselage longeron. Glue in the two vertical 0.8mm dia. carbon fiber upper to lower fuselage reinforcements.
- Page 29 Vertical Stabilizer- The vertical stabilizer can be glued in place, pins can help hold the part in alignment.
- Page 30 Rudder and Elevator Pull-Pull- Glue in place the elevator and rudder control horns, the large triangular braced side goes to the hinge side. You can now install the rudder and elevator pull-pull strings. Tie one end of the spectra thread to one side of the control surface horn, thread the other end up through one side of the servo arm, across the top, and down the opposite hole in the servo arm, then to the other hole in the control surface horn.
- Page 32 Motor Install - Dry fit the motor mount and the four 0.8mm x 1” protruding motor mount pins. When satisfied it is straight and centered, glue in place with medium CA. When dry, trim the pins leaving a small glue blob on the front side of the mount to make sure it is secured to the pins, the pins provide the majority of the strength.
- Page 33 Prop Installation - Secure the propellor to the motor before installation if you are using the recommended APC prop and prop bushing. Press the parts together using a parallel jaw pliers or a very small clamp or vice.
- Page 34 Motor and radio - Install the motor with the wires towards the lower RH side where the receiver will be. Use the provided screws, longer screws may damage the motor. Get a proper fitting screwdriver that is magnetic, or make it that way by wiping a strong magnet along the tip.
- Page 35 Finish the Decal Installation - Now is the time to add decals, paint, landing gear, or anything else that will affect the center of gravity. Your kit includes a sheet of water-slide decals. These are used because they are much lighter than vinyl type stickers. Cut the decals out with a sharp hobby knife.
- Page 36 Center of Gravity - The CG will be set using the battery location. Build a CG test stand, use the tips of your fingers, or even the eraser end of two equal length pencils shoved in some styrofoam. A good place to start is having the CG located approximately ½” behind the aileron hingline.
- Page 37 Battery Mount - Velcro may also be used to temporarily mount the battery until you find your preferred CG settings. Otherwise, with the battery location determined, use the supplied micro zipties or extra provided 3D printed receiver straps to mount the battery.
- Page 38 Flying Tips - The Omicron has very low wing loading and does not like much wind. Do not attempt to carry it from your car into a building without a box. For your first flight, I would recommend flying either in a large indoor area such as a gymnasium, or wait for a dead calm day outside.