Rich Gillis with his Air Hog differential thrust controlled P-40 (at left). Jinwoo Choe’s ½-inch scale FBA Type H Flying Boat (above) showing the construction. The FBA Type H Flying Boat (below left) at the National Building Museum. Jin’s Sopwith Tripein the background. Jin’s Avro 504K (below center) is another potential kit. #30 rubber band (below right) used to hold transmitter stick for programing the ESC port.
HobbyKing KK2.0 Multi-Rotor controller is a flight control board for multi-rotor aircraft (tricopters, quadcopters, hexcopters, etc.). Its purpose is to stabilize the aircraft during flight. To do this it takes the signal from the three on-board gyros (roll, pitch and yaw) then passes the signal to the Atmega324PA IC. The Atmega324PA IC unit then process- es these signals according to the user’s se- lected firmware and passes control signals to the installed Electronic Speed Controllers (ESCs).
“These signals instruct the ESCs to make fine adjustments to the motors rotational speed which in turn stabilizes your multi-ro- tor craft. This control board also uses sig- nals from your radio systems receiver and passes these signals to the Atmega324PA IC via the aileron, elevator, throttle and rudder inputs. Once this information has been processed the IC will send varying signals to the ESCs which in turn adjust the rotational speed of each motor to induce controlled flight (up, down, backwards, forwards, left, right, yaw).”
My flying buddy, Don Srull, put a quad- copter together for less than $100 using this
controller
and
four
Turnigy
1811-2900
brushless motors and Plush 6 ESCs with 5–3 props, an Orange Rx R620 Spektrum/JR DSM2 Compatible 6-channel 2.4 GHz receiv- er and a 1 mAh 2-cell Li-Po. All of the pieces are available from
www.hobbyking.com/. This quadcopter is about 13.5 inches across and the gross weight is about 8 ounces. Don padded it with neoprene pipe insula- tion so it could bounce off objects and the ground with impunity while he learned to fly it. I have witnessed the functionality of this setup. The other thing he did was to add a tail flag to aid in orientation. This is really necessary, I don’t know how you could fly one without it.
One scary aspect of flying a quadcopter is that the forward and aft movement is con- trolled by the left vertical stick of the trans- mitter, under Mode 2, that is normally the throttle control. For a normal model (air- plane) the instant reaction to a flight prob- lem is to reduce throttle and neutralize the controls. Do that with a quadcopter, and it will back up and come straight at you. Very scary if you have that tail flag on the end of a stick resembling a lance.
At our semiannual indoor flying session at the National Building Museum, Jinwoo Choe showed up with a couple of new micro foamie prototypes in 1⁄24 scale. He has a laser cutter and produces some nifty kits for ParkZone components. His Sopwith Tripe is a real jewel. It’s time to bug him to produce kits for the Avro 504K and FBA Type H fly- ing boat. You can find him as JINGJING JING on
http://www.rcgroups.com. The fly- ing boat cruises around truly majestically at a realistic speed.
Simple systems like Air Hogs aren’t dead. Rich Gillis is an expert in using them. He brought a P-40 Warhawk using Air Hog mo- tors and props in the wings for differential thrust control to the NBM which flew very well.
Randy Kleinert regularly flies with us. He has Dynamic Foamy’s Dynex 24 from
http://www.profileplanes.com. This model, like their Y55, uses the profile wheel pants as skids. (Either of these models is a good use of your 4-Site equipment after you had beaten it to death.) The profile wheel pant skid is simply glued to the carbon rod land- ing gear strut by a drop of cyano. Granted this is lighter than wheels, but I have found it to be a weak point. A moderately hard landing will break the joint.
Digital Pulse meter with adapters (above), and LED motor simulator. The battery switch also makes binding easier. Voltmeter with adapter (at right) for ParkZone single-Li-Po battery connector.
FLYING MODELS
Randy added a music wire axle glued to the carbon rod landing gear strut with thread and Ambroid. A foam wheel on this axle takes the shock of a rough landing and the profile wheel pant survives. For that matter you really don’t need the pants. I am tired of constantly regluing the pants/skids on my Yak 55. I am going to modify it with wheels as soon as I finish this column. The Loudoun County Aeromodelers 14th Annual Electric Aircraft Flyin is on Satur- day, July 27, 2013 from 9 to 5 at Banshee Reeks Park. Check the LCAA web site (
http://www.lcaa.org) for directions to the field and additional details. This is a nifty fun fly with vendors like Lukes R/C and Hobby Hangar.
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