SIG SOMETHIN EXTRA ARF Manuals

SOMETHIN’ EXTRA® ARF ASSEMBLY MANUAL INTRODUCTION: Congratulations on your purchase of the fantastic new SIG SOMETHIN' EXTRA® ARF kit. SIG's kit version of this unique design has proven to be one of the most popular sport aerobatic R/C models ever produced. Reasons for this popularity with modelers are many but certainly one of the most important has been the consistently outstanding flying characteristics of the design. This new ARF version of the SOMETHIN' EXTRA® retains all of these attributes and offers modelers an even quicker way to get into the air with a very high-performance airplane! Like the kit version, the ARF SOMETHIN' EXTRA® is built light and strong for best performance. Using fixture construction, this ARF has been built to virtual perfection, assuring you of a truly straight airplane. This means that it will fly straight, the way it was meant to. The covering has been professionally applied and the trim scheme is completely unique to the airplane. This trim scheme offers superb visibility in any attitude. In terms of flying capabilities, there just aren't many designs that have the huge flight envelope of the SOMETHIN' EXTRA®. Depending upon your flying skills, the SOMETHIN' EXTRA® is capable of just about any maneuver you can think of and probably a few that never crossed your mind. The design of this airplane has been well thought-out and also well proven. For example, the tail braces are there for a reason. This airplane is capable of extremely quick rolls and snap maneuvers and the tail brace system keeps those forces off of the tail group - they are needed! The two-piece wing allows easy disassembly and transportation in the smallest of vehicles. The method employed to retain the wing panels to the fuselage is simple, strong and very easy to work with. Finally, we urge you to read this manual completely. Familiarize yourself with the parts and their assembly sequences. The successful assembly and flying of this airplane is your responsibility. If you deviate from these instructions, you may wind-up with problems later on. We would also like to point out that this airplane is not suitable for beginners. The performance of this airplane is beyond the capabilities of beginning pilots. You should have good experience with low-wing, aileron equipped R/C models before flying this airplane. RADIO EQUIPMENT: The SOMETHIN' EXTRA® ARF can be flown with typical 4- channel radios and five standard servos. You will need an aileron "Y" harness to connect the ailerons to the receiver's single aileron channel. You will also likely need a couple of 6" servo extension cables for the wing mounted aileron servos. However, the real potential of the SOMETHIN' EXTRA® ARF can be realized by using one of today's inexpensive computer radio systems, such as the Hitec Flash 5X or the Airtronics® RD-6000. These radio systems allow you to "fine-tune" your control surfaces to exactly your style of flying. In addition, you'll be able to set-up the ailerons to act as flaperons, which can lend a whole new dimension to your flight routines! Using such radios, you will not need a Y-harness for the aileron connections. ENGINES, PROPELLERS, AND MUFFLERS: As stated earlier, over-powering the SOMETHIN' EXTRA® ARF is totally unnecessary and counter-productive to achieving the C.G. without the need for lead weights. This design is not about speed. Aerodynamically, the SOMETHIN' EXTRA® is not a particularly fast airplane. It's been designed to fly at moderate speeds at the high end, with incredible low speed capability. To take full advantage of the design, you should use powerful, bearing equipped 2-stroke engines in the .40 - .46 range. We have tested this airplane using the Irvine .40, .46, and the .53 engines. Any one of these powerplants flies the SOMETHIN' EXTRA® beautifully. What is especially nice about Irvine engines is their great power, truly linear throttle response, and their extremely efficient mufflers. We suggest you to give serious thought to the engine you intend to use for this airplane. A marginal engine will always yield marginal results. When using 2-stroke engines, avoid heavily pitched props. Ideally you want your engine pulling as well vertically as it does in horizontal flight. To do this, it needs to operate at or about its best rpm level to take advantage of its power curve. For 4-stroke engines, we suggest displacement sizes up to .65. Using engines larger than this will likely give you weight and balance problems, along with the realities of propeller clearance. Another important thing to remember is that typical 4-stroke engines have their throttle arms usually located differently than throttle arms on 2-stroke engines. If you want to power this model with a 4-stroke engine, you will likely have to install a new, relocated throttle cable tube. While this is not difficult, it is something to consider when choosing an engine. No matter what engine you choose always use an effective muffler! A loud engine could cost you (and possibly your club) the use of your flying site if it offends nearby non-modeling neighbors. Use the muffler that came with your engine or an after-market muffler made especially to quiet two-stroke engines. COVERING MATERIAL: Your SOMETHIN' EXTRA® ARF has been professionally covered using AeroKote™. This material is known for its ease of application, light weight and consistency of color. If you live in a dry climate, you may notice that some wrinkles may develop after removing the covered parts from their plastic bags. This is perfectly normal in low humidity climates. Your model was built and covered in a part of the world, which has relatively high humidity and therefore, the wood was likely carrying a fair amount of 1 R