cat > /mnt/user-data/outputs/vehicle-delifisek.html << 'EOF' DeliFisek - BFLY SUAS Team
DeliFisek Drone
BFL'Y SUAS Team · Second Vehicle

DELİ
FİŞEK High-Speed Autonomous UAS

Purpose-built for speed, agility, and competition. DeliFişek is BFL'Y's second autonomous platform — engineered from the ground up to push the limits of what a student-built UAS can achieve at full throttle.

120km/h Max Speed
18min Endurance
1.1kg MTOW
View Specs ↓ Gallery
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120 km/h Top Speed
18 min Flight Endurance
1.1 kg Max Takeoff Weight
400 g Payload Capacity
2.9:1 Thrust-to-Weight

Highlights

What makes DeliFişek different.

Design

Aggressive form.
Uncompromising speed.

DeliFişek's swept-arm geometry isn't aesthetic — it's aerodynamics. Every degree of sweep, every millimeter of motor-to-center distance was computed to minimize drag and maximize rotational inertia at speed.

DeliFisek top-down design view

Software

Fast code
for a fast machine.

DeliFişek's autopilot runs a hard real-time loop at 400 Hz. The BFL'Y software team rewrote the inner control loops from scratch to handle the latency demands of high-speed autonomous flight.

Rate Controller

400 Hz PID loop tuned for aggressive maneuver response

Waypoint Engine

Predictive path tracking at high-speed approach angles

Failsafe Core

Multi-layer safety with auto-RTL response under 200 ms

Telemetry

MAVLink 2.0 · 50 Hz state broadcast to GCS

rate_controller.cpp 
// DeliFisek Rate Controller -- BFLY SUAS
#include "rate_controller.h"
#include "mavlink_bridge.h"

void RateController::tick(float dt) {
  Vector3f rate = imu.gyro_rate();
  Vector3f err  = target_rate - rate;

  output.roll  = pid_roll.update(err.x, dt);
  output.pitch = pid_pitch.update(err.y, dt);
  output.yaw   = pid_yaw.update(err.z, dt);

  if (output.any_saturated()) {
    desaturate(output, mixer);
  }
  motor_mixer.apply(output);

Details

Built to the last gram.

The 15-degree swept arm geometry pushes each motor outward for higher rotational authority while keeping the frontal cross-section below 180 cm. The full frame tips the scale at 380 g in 3K twill carbon fiber.

Four 2207 2750KV motors paired with 4-inch tri-blade props generate 3.2 kg total static thrust — a 2.9:1 thrust-to-weight ratio that enables near-vertical acceleration from a standing start.

A two-board stack carries the BFL'Y custom FC running ChibiOS at the bottom and a companion Raspberry Pi Zero 2W for mission logic at the top. Total stack height: 18 mm — thinner than a pencil.

A CNC-machined aluminum cradle locks the 400 g payload in under 3 seconds via a quarter-turn latch. Electrical passthrough contacts allow powered payloads with no external wiring.

A 4S 3300 mAh 120C-rated LiPo sits inside a crash-protected carbon sleeve. A dedicated 5V/3A BEC keeps avionics isolated from motor noise during high-throttle bursts.

Swept-Arm Airframe Place detail images: assets/images/delifisek-detail-*.jpg
General Info

Baykar Fen Lisesi SUAS DELİ
FİŞEK

DeliFişek — Turkish for "wild fuse" — is the BFL'Y team's second autonomous UAS and a deliberate departure from their first vehicle. Where SkyWipe was built for precision and endurance, DeliFişek was engineered around a singular obsession: speed. At 120 km/h with a sub-1.1 kg airframe, it is the fastest autonomous platform ever produced by the BFL'Y programme.

Designed in parallel with the team's second competition season, DeliFişek incorporates lessons learned from two full years of field testing. Its airframe, avionics, and autopilot firmware are entirely student-developed. The modular payload architecture allows rapid mission reconfiguration between competition tasks — from precision delivery to autonomous waypoint racing — in under 60 seconds on the flight line.

In Detail

Every
angle counts.

Scroll to move in on DeliFişek — from full-frame overview down to close hardware detail.

01

Full airframe — swept arm geometry and overall proportions

02

Mid approach — arm structure and motor mount detail visible

03

Close detail — avionics bay, payload cradle, and power connectors

DeliFisek zoom view

Season

Competition Roadmap

Done

Conceptual Design Review

Airframe geometry locked, propulsion system selected, initial weight budget confirmed.

CDR
PDR

Done

Preliminary Design Review

CAD finalized, PCB layouts submitted to fab, full BOM sourced and ordered.

Done

First Hover

Maiden hover at the school's test area. All sensors nominal, rate loops tuned to target.

FH
NOW

Active

Speed & Endurance Testing

Full autonomous waypoint missions in progress. Targeting 120 km/h benchmark this month.

Upcoming

Payload Integration

Payload bay qualified with competition mass simulators. Drop mechanism validated at speed.

PIR
FLT

Upcoming

Competition Flight

Full autonomous mission executed at the TEKNOFEST SIHA competition field.

Specifications

Technical Data

Airframe

MTOW1.1 kg
Frame Weight380 g
Wheelbase210 mm
Material3K Twill Carbon Fiber
Arm Sweep15 deg

Performance

Max Speed120 km/h
Endurance18 min
Max Wind8 m/s
Position Accuracy±3 cm (RTK)
Thrust-to-Weight2.9 : 1

Propulsion

Motors4x 2207 2750KV
ESCs4x 45A BLHeli32
Propellers4-inch 3-blade CF
Battery4S 3300 mAh 120C
Max Thrust3.2 kg total

Avionics & Comms

Flight ControllerBFL'Y Custom FC
Companion CPURPi Zero 2W
IMUICM-42688-P x2
Data LinkMAVLink 2.0 / 5.8 GHz
Control Link2.4 GHz ELRS

Gallery

Media

assets/images/gallery-df-1.jpg
Speed Run Track Day
assets/videos/gallery-df-2.mp4
Autonomous Waypoint Mission
assets/images/gallery-df-3.jpg
Avionics Build
assets/images/gallery-df-4.jpg
Payload Drop Test
Active Development — 2025/26 Season

Faster every week.
Not done yet.

DeliFişek is mid-season and the performance numbers keep climbing. Follow the BFL'Y team as we push toward competition day.

Meet the Team View Gallery