Spl2b - UNIFIED UNIFIED RC Aircraft Competition Introduction FLIGHT TRAINING FLIGHT • Primary contact Scott Christopher • Please keep in mind

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Unformatted text preview: UNIFIED: UNIFIED: RC Aircraft Competition Introduction FLIGHT TRAINING FLIGHT • Primary contact: Scott Christopher • Please keep in mind, I’m doing this project doing as well as SYSTEM SYSTEM • Starter Session • Simulator skill building • Buddy box Dragonfly flights • *Free flight • Try out plane Vanilla Starter Session Starter • ~1 hour on simulator with me • Describe basic control characteristics • Basic maneuvers: – Take-off / Landings – Constant banks angle turn – Simple circuits – Figure 8 • Emergency routines (accident recovery) Buddy Box Buddy • Trainer has control at all times • Has the option to “hand off” control Has • ‘fairly’ good system • Help to save potentially fatal crashes • No guarantees Flying a Dragon(fly) Dragon(fly • Early in the mornings (6 am-ish) • In Johnson • Wing of your choice – (I recommend the stock wing) Flight Testing Time Flight • Johnson Indoor Track • Mondays 7:30-9am 9am • Most mornings before (7) am • I DO NOT recommend flying outside – Most designs will not survive the wind – Can give you improper feedback about flight Can characteristics characteristics Simulator Simulator • Where: Mezzanine of Hangar, outside Col Where: Young’s office Young • Simulation: G2 RC flight Sim – Plane: RCFT BLT Park flyer – Any airport to start – Try out johnson for an enclosed space – Also try: PT40, Simple Flyer, anything else Also that peaks your interest that PILOTING PILOTING • Mandatory for all teams to have a pilot • Will count towards a grade bonus • Buddy Box setup – Pilot Primary – Prof Drela, Col Young, Scott, Adam, Carl or Prof Mikel secondary Mikel • Each pilot given a Cooper-Harper like Harper rating rating Battery Charging Battery • Battery “TO BE CHARGED” box Battery – Takes at least 16 hours to charge – Dropped off before 5pm will be ready the next Dropped evening evening • (Monday afternoon -> Tuesday evening) (Monday • Battery “CHARGED” box Battery – Will be put out every evening at 5pm Radio Replacement Radio • Please submit (in writing) the symptoms of the Please • radio radio Hand in your Tx and Rx – Handing in you servos is also a good idea • You will get a new Rx Tx combo • DO NOT REMOVE THE BATTERY OR X-TALS! – They get lost and nobody wins Motor Replacement Motor • Turn in your motor and speed control unit • You will get a new motor speed controller You combo combo • No guarantee on turnaround • DON’T CRASH! – If you do crash, don’t nose into anything Construction Basics: Contents Construction • Adhesives • Balsa • Foam • Radio • Wing • Surfaces • Landing Gear • Motor Construction Basics: Adhesives Construction • USE SPARINGLY – Save weight and supplies • CA – – – – Balsa to balsa, balsa to rough plastics Stiff and brittle Light Quick(ish) setting – – – – Balsa, foam, plastics, sometimes metal Flexible Heavier Slow setting • Epoxy Construction Basics: CA Construction • Do not overuse CA • If you think you need more CA, use epoxy If • instead instead Avoid using accelerant if you don’t have to – Gives a stronger bond if you don’t – Do use accelerant if a ‘difficult’ or ‘fast’ bond Do or • BE CAREFUL: – – CA eats foam and some other materials Always test first Construction Basics: Epoxy Construction • Know exactly what you want to glue Know before mixing before • Mix in very small batches • 1 to 1 mixing ratio resin to hardener • Mix on paper with SCRAP stick • Pot time: ½ to 3/5’s hardening time Pot Construction Basics: Balsa Construction • Cutting: – < ¼” think use a razor blade ¼” – >= ¼” use a small (high tooth per inch) saw >= ¼” • Measure once, cut twice NO!!! • MEASURE TWICE, CUT ONCE! Construction Basics: Foam Construction • CA eats foam • Propellant in 3M 77 (spray adhesive) eats foam • Wood glue does not dry inside foam joint • Use a hot wire to rough out a cut • Sand down after cutting • Mistakes: use lightweight spackle to fix it • By merely existing, foam will get damaged Construction Basics: Foam Cutter Construction • Make sure the wire is taut • Make sure the wire has been zeroed • Machine is finicky, test cut on a thin Machine section of foam section • Use leading edge loop option • DO NOT MESS WITH THE POWER DO SUPPLY! SUPPLY! Construction Basics: Foam Cutter Cont’d Cont • The software has a lot of useful features • Talk to Dave, Col Young, or Prof Drela to Talk Drela to learn how to use the foam cutter learn • Brush off whiskers after cutting • Save the foam beds! (may be used in Save another lab) another Construction Basics: Radio Construction • Channel 1: Ailerons or Rudder (rudder for Channel 3 channel setup only) channel • Channel 2: Elevator • Channel 3: Throttle (speed controller) • Channel 4: Rudder (4 channel setup only) • Channels 5 & 6: Auxiliary or battery (not Channels needed, we have Battery Eliminator Circuits aka BEC) Circuits Construction Basics: Radio Cont’d Construction • Rule of Thumb for connectors: gold Rule squares on connector go ‘UP’ • Other rule: small rounded edges go Other ‘DOWN’ • Other rule: Signal wire (yellow or orange Other usually) faces towards the inside of a Rx usually) • Final Rule: If it doesn’t work, flip it over Construction Basics: Radio Cont’d Construction • ‘Open up’ all of the pots on the front of Tx • Check the direction of servo throws – Reverse switches are on the bottom or front Reverse of Tx of • Centering rules: • Test fly with (set angles) throws – Only after test think about reducing throws Construction Basics: Surfaces Construction • ‘Clean’ a surface to be taped by applying and surface • • • removing some masking tape removing Make sure the hinge line is VERY STRAIGHT Overestimate your control throws If you need more throw: – Increase servo side moment arm – Decrease surface side moment arm • Tape/glue down your push rod sleeves Construction Basics: LG Construction • Have enough clearance for the prop when Have plane is level AND at ~ -20° • LG are a huge drag contributor • Make sure your tale surfaces don’t touch touch the ground, even when deflected the Motor Motor • Make a motor mount that will prevent Make slippage in 2 axis (fore/aft, left/right) slippage • Use a single or double wrap of masking Use tape to hold the motor in place tape – Holds secure enough for our purposes – Saves the motor from damage in a crash/prop Saves strike strike ...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.

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