Table of Contents

Aufbauanleitung und Inbetriebnahme

3D Modelle sind unter searchwing-3d-modelle verfügbar.

KnowHow

PX4 Parameter auslesen

Flieger kalibrieren

Klebstoffe

Schwerpunkt messen

Mini Talon Wings and Fuselage

Main Wing

Fuselage beams

Diameter: 4.1mm, length: 492mm

The fuselage beams are the ones from the Mini Talon. Here is: How to glue the fuselage beams (milled frame)

Power Module

The power module provides the 5V DC/DC converters and the MOSFET switch. How to mount the power module in the fuselage

Wing Servo Connection

The servos in the left and right wing control the aileron. Here is: How to build the Wing servo connection

Inner Frame

The inner frame connects the Wingholme with the fuselage and it carries the PixRacer and the GPS Receiver. The frame is manufactured with 3D Print: How to build the inner frame

Raspberry Pis incl. connection to Powermodule and PixRacer

Two Raspberry Pis are mounted in the fuselage. Here is: How to mount the Pis and the Camera

The camera hole is protected with acrylic “Plexiglas kratzfest Optical HC 2mm” glas. This is available at Plattenzuschnitt24.de. One side of the Plexiglas HC glas has a special coating to make it scratch resistant. The glas is glued over the hole with Sikaflex 295-UV. This glue is specially designed for glueing plastic glas in maritime environments.

RFD868+ Telemetry Radio connection

The RFD868+ long range telemetry is mounted on the right side of the fuselage. Therefore the modem is connected to the pixracer and power module just before glueing the left and right fuselage parts. Here is: How to mount the RFD868+ modem.

Connectors, Cables and Switches

Servo Cable

We use the Emax ES08MD servo. Servo cables come in two different coloring schemes.

The minimum cable diameter is 0.08 mm2 (AWG30) and the maximum cable diameter is 0.5 mm2 (AWG18), which is limited by the servo standard connector. There are two different isolation materials around

The cable comes in different qualities regarding the flexibility which translates to a different number of copper wires in the cable.

For our application the highly flexible versions should be used because they are designed for vibration environments.

Basic servo cable could be: Muldental 3 x 0.14mm2 (AWG26), 72x0.05mm, PVC cable, JR color, 5m for 6.10€.

Servo standard connector

The standard servo connectors are based on FCI Amphenol Mini PV Basics+. There are different connectors for the AWG18-20, AWG22-26 and the AWG28-30 range. See the product description. Crimping seems prone to errors, so precrimped cables might be the way to go. We do not have a crimp tool for these in the lab.

I think in the lab we have a clone product from Harwin.

including the Harwin M20 crimp tool.

The housings and connectors of different manufacturers seem not to fit, i.e. the Harwin M20 connector does not fit in the FCI housing.

Servo cable watersealed connector M5

The wings must be removable and the fuselage must be watersealed. Therefore the servos in the wings are connected with a

Alternative from NorComp:

Battery cable

Also for the battery a highly flexible cable should be used.

Power cable for Telemetry and Pi

The RFD868 telemetry modem and the Raspberry Pi are powered from an extra power supply. Both have the 2.54 mm standard connectors. Therefore this can be connected with the servo cable connectors. Suitable might be:

JST-GH Connector and Cable for PixRacer

The Pixracer, the mRobotics power module and the mRobotics GPS have JST-GH connectors. The crimping again requires special tooling. But there are precrimped cables.

Switch for Battery (Watersealed)

It should be possible to switch off the battery from the outside. This requires a watersealed solution.

A smaller alternative with 10A max current is

The (initial) on-resistance of 100mOhm of the Marquard switch will result in 10W Power consumption at 10A. A better approach is to use the switch to control the MOSFET. A schematic for the power switch including the MOSFET is here:

Battery charging plug

To charge the battery from outside a watersealed plug is required

Montage Rumpf und Halterungen

Antriebsstrang

Servos wasserdicht

V-Tail anbringen

Flügel zusammenbauen

Deckel anpassen

Rumpf abdichten

Rumpf zusammenbauen

Linke Rumpfhäfte

Rechte Rumpfhälfte

Autopilot

Motor montieren

Inbetriebnahme des Autopiloten (Pixracers)

Ansteuerung Servorail

Airframe “Plane V-Tail”, Name “X-UAV Mini Talon” in der PX4 Dokumentation (http://docs.px4.io/en/airframes/airframe_reference.html#plane-v-tail).

Bei Ardupilot werden die entsprechenden Servofunktionen als Parameter eingestellt (http://ardupilot.org/plane/docs/servo-functions.html).

Kontrolle der Servokonfiguration

Waterproofing the servos (alternativ way)

One interesting article on Instructables on this topic:https://www.instructables.com/id/Waterproof-your-servo-motors/

1. Make the housing waterproof

* I used “Curil”, a standard sealing compound. * Open the servo and put the sealant an all touching surfaces * also put sealant to the cable, where it leads through the housing

servo_sealant.jpg

2. Insert a O-Ring under the horn

* remove the horn * add a 1mm thick o-ring * add some lubrication. I used “CRC Multilube” - attention - lubrication has to be compatible with the rubber of the sealant. Don't use silicon rings with silicon lubricant. * screw the horn back on

servo_oring.jpg

http://wiki.rc-network.de/index.php/V-Leitwerk


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