165.80 mph 5s Quad: VXR-190

By Phanny P on Aug 12, 2017

2 631  12 

165.80 mph (266.83 kmh) is the average speed taken in back to back opposite direction passes over a distance of 100 meters. A link to the data and analysis is below.

Still relying heavily on physics in the continuing pursuit of efficiency. Frame strength was always an issue, but that was addressed with this frame which is only 48g and can handle me standing on it (165 lbs). If I could just do something about that Easter egg nose... Apologies - I am severely lacking in pictures of this frame at the moment.

Oh nooooo!

The next flight didn't go so well. After reviewing everything, I found a peculiar impact mark on the body (see the image below): it was very defined, at the same angle as the prop blade, and in a spot where an impact with the ground couldn't have done any damage. When reviewing the blackbox log, it showed motor 1 jump to 100% at the same moment the quad went into a spin. The conclusion was a prop failure. That's what I get for going over the manufacturer's limits! However, I can't be 100% sure of this conclusion... Although the frame can handle me carefully stepping and standing on it, 2 of the arms (and egg) didn't survive the 60+ mph impact on hard, compact dirt. No better reason to move on, so on to the next project - I think I might finally be ready to bump up to a 6s, but then there is this issue: https://downanddirtydrones.com/2017/07/11/quadcopters-have-hit-the-sound-barrier/

Links

How the data is analyzed

Blackbox Log file

Decoded GPS log

Drone Physics

Photos

Part List

Frame

VXR-190
Downanddirtydrones.com
See Site

Flight Controller

BetaflightF3 AIO Flight Controller (144 builds)
Rccrazed.com
$42.99

ESCs

4 x Spedix 30A 2-6s BLHeli_S ES 30 HV ESC
Defiancerc.com
$51.96

Motors

4 x COBRA MOTORS CP22072450... CHAMPION SERIES 2207 2450KV
Propshophobbies.com
$91.96

Propellers

5.2x6.0E-B4
Apcprop.com
$5.96

FPV Camera

Crazepony 700TVL Wide Angle FPV Camera 700TVL 3.6mm Lens NTSC for QAV250
Amazon.com
$15.99

FPV Transmitter

AKK X1 40CH 25mW/200mW/600mW Switchable FPV Transmitter with Push Button and Digital Display (9 builds)
Amazon.com
$18.99

Antenna

Anbee FPV 5.8Ghz Circular Polarized Clover Leaf Antenna High Gain Aerial Set w/RP-SMA Female Plug
Amazon.com
$8.98

Receiver

Lemon Rx DSMX Compatible Diversity Satellite (DSM2 backward compatible but must use DSMX compatible primary receiver) LM0037 (3 builds)
Amazon.com
$13.09

Batteries

Tattu 1300mAh 5S1P 75C 18.5V LiPo Battery
Defiancerc.com
$31.99

Misc Parts

MIDWEST PRODUCTS 5742... CARBON FIBER STRIP,.057x.177 ( (3 builds)
Propshophobbies.com
$6.99

Misc Parts

Plastic Easter Eggs (24 Pack) Hinged 6 Asst Colors
Amazon.com
$6.95

Misc Parts

Micro uBlox M8N GPS GLONASS W/ (18x18mm) (6 builds)
Readytoflyquads.com
$16.00

Misc Parts

MagiDeal Pack of 4 Carbon Fiber Tube 8*6mm 330mm DIY Vanished Surface Tail Tube (2 builds)
Amazon.com
$13.99

Misc Parts

Autek 2pcs 6MM OD X 4MM ID X 400MM Carbon fiber wing tube Quadcopter arm Hexrcopter
Amazon.com
$11.99

Misc Parts

Braided Carbon Fiber Round Tubing ~ 1.75" ID x 24"
Dragonplate.com
See Site
Show stores (8)

Discussion

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nikondera   Aug 16, 2017  

How do you transfer the information from the GPS-tracker to your OSD?

Phanny P   Aug 16, 2017 

I will try to explain it, not at home rt now: You hook up the gps to one of the uarts on the flight controller. Whatever uart port you are using, set it to gps in the ports tab in betaflight (i cannot remember baud rate). Now set the osd so it shows gps speed. You either have to have an osd built into the flight controller or use a micro minimosd. You got me thinking, I should write up a tutorial.

metropolis   Aug 12, 2017  
1

Nice job, bud!!! :D

Phanny P   Aug 13, 2017 

Thanks! It almost didn't happen. Lost GPS lock after 1 pass, loitered with no luck, then just before landing I got a lock again and went up for 2 more passes (the ones in the video)

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