Fly Gear • Aircraft Startup Guide

DeepSpace Seeker 35

“YOU CAN DO IT!!!” Edition — a compact, serious 3.5-inch 6S manual FPV aircraft with DJI O4 Wide digital video, ExpressLRS and GPS.

3.5-inch6S XT60DJI O4 Wide ProELRS 2.4GHzM10 GPSPROPS-OUT

Meet your Seeker 35

Battery

Use a quality 6S LiPo with the correct XT60 connector and enough discharge capability for a high-performance quad. Roughly 650–1100mAh is a practical starting range for many 3.5-inch 6S builds, but confirm physical fit, weight, center of gravity and your flying style. The battery is not included.

1. Power up the radio and goggles

GOGGLES → RADIO → QUAD

1. Remove the goggle lens protector and power on compatible DJI goggles.
2. Power on the ExpressLRS radio. Confirm the intended control profile and throttle fully low.
3. Place the quad on a level surface with the props clear of people, pets, straps, tools and loose objects.
4. Secure the 6S battery tightly, check XT60 polarity, then connect it. Listen for normal ESC startup tones.
5. Confirm the ELRS control link, DJI video and Betaflight OSD before arming.
6. If using GPS functions, wait outside for adequate satellites and a valid home position.

DISARM → UNPLUG QUAD → GOGGLES OFF → RADIO OFF

2. ExpressLRS and DJI O4

3. Betaflight controls and props-out

Use the protected USB-C access for Betaflight and support the connector while plugging in or removing the cable. Remove every prop first.

Modes to understand

• ARM: starts the motors; treat it as a safety control.
• ACRO / Rate: normal manual FPV flight; the quad does not self-level.
• ANGLE, if configured: self-leveling assistance, not autonomous flight.
• BEEPER: helps locate the quad.
• GPS Rescue, if configured: emergency recovery aid—not DJI Return-to-Home.

Receiver and orientation check

• Roll, pitch, yaw and throttle move in the correct direction.
• Every switch moves the expected AUX channel and enters the intended Modes range.
• The Betaflight 3D model follows the real aircraft when tilted.
• A Betaflight backup or diff is saved before changing ports, rates, filters or failsafe values.

4. GPS, failsafe and first flight

Mini M10 GPS

• Move outside and give the GPS a clear view of the sky; a cold acquisition can take longer.
• Do not judge GPS performance indoors, under a metal roof or beside large metal objects.
• Confirm satellites, coordinates and home information in the OSD before using GPS functions.
• Keep the GPS and wiring secure and separated from unnecessary electrical noise where practical.

First-flight checklist

• Frame, motor, arm and prop hardware secure; no bent or cracked props.
• Correct 6S battery, XT60 polarity correct, both straps tight.
• Props installed in the verified props-out positions.
• ELRS connected; ARM and mode switches understood; throttle low.
• DJI image clear; OSD visible; recording set as desired.
• GPS lock confirmed if using GPS-based functions.
• Take off gently, hover low, listen for vibration or oscillation, then land and inspect.

After the first pack: unplug the battery and check motor temperature, props, arms, straps, TPU, antennas and wiring. Painfully hot motors, rough bearings or unhealthy sound require investigation before another flight.

5. Ownership, safety and support

Builder support

I can help with basic Betaflight orientation, ELRS binding, DJI pairing, flight modes, OSD and GPS setup. Save a Betaflight backup before making changes. I do not operate a general repair service for crashed aircraft, but I may be able to help diagnose a problem remotely.