2.5" 3S bullshark: terrorizer of parks

By deks on Oct 29, 2017

11  807  0

A prototype Bullshark that fits 2.5" props and has a 3mm bottom plate. A replacement for my Atom mini frame.

I noticed that this build is considerably quieter than when I had the same components on the Atom mini. I also feel like there's less prop wash. I guess the stretch geometry makes for less turbulent air, compared to the more compact and deadcat geometry of the Atom mini.

I need to use the 20mm standoffs to fit everything. I don't know how lazd fit everything in 17mm, including an LED board under the shark fin! Maybe the trick is to stick the RX in between the ESCs and FC.

The DYS 2435 props aren't that great. They're quite brittle, and I didn't notice much more thrust compared to the Gemfan 2035's. I'm hoping to test the RotorX 2535s at some point.

So far, I've just had one really bad crash straight onto an arm, but it made it through.

Dry weight: 85g. Lazd's is only 76g. I'm guessing I've just got an extra 9g of hot glue on mine.
AUW w/ Tattu 450mah: 128g

PIDs aren't perfect, but they work well enough for the moment:

  • Roll: 28, 35, 20
  • Pitch: 28, 50, 20
  • Yaw: 70, 45, 20
  • BF 3.2.0, dynamic filtering on, PT1 gyro filter, gyro notch 1 off. Anti-gravity gain ~3.0, I think.


Photos

Part List

Frame

Bullshark (18 builds)
Falconmultirotors.com
$35.00

Flight Controller

OMNIBUS F3 AIO Nano V2 Flight Controller (17 builds)
Airbladeuav.com
$35.99

ESCs

Cicada 4-in-1 10A BusyBee2 Tiny BLHeli_S DShot ESC (33 builds)
Airbladeuav.com
$34.99

Motors

4 x AirBlade AB 1105 7500kV 2S-3S Brushless Racing Motors (flexible wires) - Single motor (22 builds)
Airbladeuav.com
$43.96

Propellers

RotorX RX 2535 Props (8 CW & 8 CCW) (27 builds)
Airbladeuav.com
$7.98

Propellers

4 Pairs DYS 2435 60mm 4 Blade Propeller 1.5mm Mounting Hole For 11xx Motors 80-110 FPV Racing Frame (6 builds)
Banggood.com
$4.19

Propellers

Gemfan PC 2035 BN Bullnose 4-Blade Polycarbonate Unbreakable Clear/Clear Blue/Clear Purple (34 builds)
Airbladeuav.com
$3.39

FPV Camera

RunCam Micro Swift 2 FPV Camera CCD (289 builds)
Airbladeuav.com
$34.99

FPV Transmitter

Eachine VTX03 Super Mini 5.8G 72CH 0/25mW/50mw/200mW Switchable FPV Transmitter (426 builds)
Airbladeuav.com
$14.99

Receiver

FrSky XM+ SBUS Mini ReceiverDefault Title (1423 builds)
Airbladeuav.com
$12.99

Batteries

Gaoneng GNB 11.1V 450mAh 80/160C 3S Lipo Battery JST/XT30 Plug (3 builds)
Banggood.com
$13.61

Batteries

Gaoneng GNB 11.1V 550mAh 80/160C 3S Lipo Battery JST/XT30 Plug For Eachine Lizard95 FPV Racer (21 builds)
Banggood.com
$12.99

Batteries

Tattu 11.1V 75C 3S 450mAh Lipo Battery Pack with XT30 plug (5 builds)
Genstattu.com
$11.86

Batteries

Tattu 3S1P 75C 11.1V 650mAh Lipo Battery Pack with XT30 Plug (7 builds)
Genstattu.com
$10.45

Misc Parts

DC Magnetic Buzzer 5V (9x5.5 and 12x7.5) (7 builds)
Airbladeuav.com
$1.00
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