Hacks & Mods

Electronics - 4  IMU, servo bus, hinged access door

Electronics, Servo & Motor section of fuselage
- Part 4

Above -First iteration of Ru & El servo tray. Replaced by -- see Fig B.

Fig. B
Bottom View

Fig. B View - Servo Mount inside Tail section -
New (3/16) inch thin plywood by 3 5/8 inches wide (Ru and EL) servo mount to be placed in tail section , then slid back in botmite aircraft. Rectangle space cut with dremel carbon wheel and holes cut by drill. Carbon fiber tubes are Plumberís gooped to fore of servo tray to guide 10 gage Red and Black power cables to fit inside fuselage - screw attached to back - from LiPoís to ESC in air scoop.

Rear - Prop View
Tail Section

  Pre-cut of post wing/tail section (4). White cloth tape marks rectangle area for dremel wheel cut.

  Fresh cut of post wing/tail section (4). Control rods for Rudder and Elevator shown through center of fuselage before their removal as servos are relocated to tail section. Note wing tab plywood support to top right.

  Fresh cut of tail (motor, servos, electronics) section (4). Control rods for Rudder and Elevator removed here.  First version of Ru and EL servo tray shown on left. Wing tab plywood support - top right - visible.

Top Left side shows new two wood piece servo mount - aluminum clip epoxy attached to vertical tail plywood frame and steel wire linkage connector.  100 Amp programmable ESC mounted to top duct cowling.

Rear View into Tail Section showing new servo mount - this shows two wood piece mount - This mount clips to vertical frame in tail - Epoxy attached to vertical tail plywood frame. Steel wire linkage not yet connected to servos. 

View of Electronics Enclosure in Tail Section with hinged door - Protective metal enclosure houses Inertial Management Unit. Preliminary location mount has vibration dampening pad inside and under metal box.

(Above) Inside View toward Propeller - View From linkage.

  Above 3/16ď thick plywood is cut using Scroll saw to match interior contour of fuselage.  Thin plywood is placed inside the fuselage and the perimeter line is penciled over the thin plywood sheet. The hook screw thread is internally surrounded by two pieces of this plywood to provide hard point support using epoxy glue. One plywood support is integral to aircraft fuselage. Then support is strength tested for quality assurance by placing a brick in the airframe and suspending it from the two hooks.

Making Thin Plywood Template - Cut on a Scroll Saw, attach slices of plywood with either epoxy or Plumberís goop to the grey fiberglass exterior to match with a streamlined fuselage.   You can place thin plywood directly up against opening in fuselage and trace over the round contour to cut.

Top Telemetry modem over IMU computer - Formica epoxy and drill hole to mount 900 Mhz data transceiver.  

Plan View Telemetry Antenna - In front of air intake for electric motor & ESC. 

IMU metal enclosure - GPS to Left, Servos wiring on Right - Placed in front of telemetry unit, IMU vibration dampened inside and below.  Metal box serves to support and protect IMU electronics. Dremel open top using carbon cutting wheel. Then, file rough edges out.

  Retail circuit board cut into segment where 0.1 header pins are soldered across copper wire. One three wire bus is for aileron servos, the other  bus is for flap servos.  This bus is used in lieu of a splitter servo cable. 
   The plastic packaging is cut into segments and glued to the servo motors to expand the footprint for hot or electric glue to attach to underside of wing.  Hair Dryer can be used to reset location of servo set with hot glue.

  View inside fuslage looking back to outrunner electric motor (~850 Watts) - carbon fiber brace barely visible.  This vertical brace clears power and signal (red, white, black) wire away from motor. Note stabilizer brace toward bottom left.

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