About

Gender

Male


Location

Glen Huon, Tasmania


About Me:

Background in electronics and engineering, hobbies are based around engineering projects, flying, driving or burning, or all of the above.


Please tell us a bit about your UAV interest

I have designed and built many multirotors, I also build and fly fixed wing and helicopters.


Hometown:

Glen Huon


Activity Feed

Alasdair replied to mark bellncula's discussion Battery Issue???
"Another thing to keep in mind is the 'B.S' C ratings that are printed on most lipo batteries which are to be taken with a grain of salt. We have tested countless makers batteries and none can deliver their claimed C output for more than a few…"
Jul 2, 2016
Alasdair replied to mark bellncula's discussion Battery Issue???
"Another problem is, the energy put in, unfortunately is not what you get out, after subtracting resistive losses due to failing cells, or even healthy cells, there is always some loss. When the cell has plated off from over charge/discharge it…"
Jun 30, 2016
Alasdair replied to Anton Vanhoucke's discussion 433 Mhz dipole vs. GPS: total decimation
"Also, a ground plane may not help you in distant maneuvers, like a banked turn either way from heading out will likely black out your signal until you level off, unless you are at extreme altitude relative to distance. As Joe alluded to, keep it…"
Jun 30, 2016
Alasdair replied to Russell Allbritain's discussion Can this only be a bad Rx ( or Tx ) ?
"I too thought brownout, Craig I do the same trick with cap, but also add a low junction voltage shottky diode to free the rx and cap from getting pulled down by the load, effectively decoupling it. Interference is always possible in the pea soup…"
Jun 29, 2016
Alasdair replied to mark bellncula's discussion Battery Issue???
"Have you tried load testing the battery? Even just connect a multimeter and tether the quad down, run it up and watch the voltage. Chances are it is a dud battery, the low 'fully charged' terminal voltage is pointing that way as well, it has either…"
Jun 29, 2016
Alasdair replied to Anton Vanhoucke's discussion 433 Mhz dipole vs. GPS: total decimation
"Not proven, like the actual frequencies that the telemetry system is utilizing and where the third harmonic is in relation to the L1 and L2 GPS frequencies (1575mhz and 1227mhz), the L2  landing around 424mhz and fourth order L1 around 393mhz…"
Jun 28, 2016
Alasdair replied to Anton Vanhoucke's discussion 433 Mhz dipole vs. GPS: total decimation
"The Dragonlink system uses 433mhz, so any of the receiver (v2-v3) antennas will suit, they are sma, and as shown in my photo have a tiny matching transformer on the pcb. They are available in various lead lengths or direct mounting as my pic shows.…"
Jun 28, 2016
Alasdair replied to Anton Vanhoucke's discussion 433 Mhz dipole vs. GPS: total decimation
"Hi Anton,
Prior to reaching the page showing the insides of your antenna connection, I thought, I'll bet it is direct fed unmatched helical, and there it was.. A large problem exists with that type of antenna, in that the mismatch between feeder and…"
Jun 28, 2016
Alasdair posted photos
Jun 19, 2016
Alasdair replied to J_Pat's discussion M8N GPS, APM 2.8 Accuracy and Land mode issue
"Have you tried disconnecting your telemetry module and hovering in position hold etc. New GPS and glonass channels are all over the place including 1.2g as of the next few months, the extra satellites give better HDOP but make things a lot fussier,…"
Jun 18, 2016
Alasdair replied to Mr Lemming's discussion I am about to buy an Iris, please advise
"If I can offer one piece of advice that will probably save you a lot of pain and heartache, and that is to buy a cheap toy quadcopter that is big enough to fly outdoors, with no frills, no fpv or gps, just a plain basic cheap quadcopter. Then fly it…"
Jun 18, 2016
Alasdair replied to Bob Smith's discussion Repair problems.
"Another thing is to ensure that the flight controller board was installed the same way around that it came off the other frame. The usual flip issue is motor order or direction issues, and just having props arranged for downward thrust doesn't…"
Jun 18, 2016
Alasdair commented on CliffN's photo
"Interesting design, I like microlight planes, especially scratch builds and a recent revelation of using a flysky FST6 with a receiver board from a F949 gives me two onboard servo's (R/E) and a 3A esc for total weight of 6g and under $20, I plan a…"
Jun 3, 2016
Alasdair replied to Andrew Brown's discussion Post Crash Log analysis help
"-Sorry, i can't open your flight logs, but a spin sounds a lot like lack of forward airspeed, versus groundspeed, and recovery at the crucial moment that it's required needs lots of power with opposite rudder then elevator once the spin becomes a…"
Jun 2, 2016
Alasdair replied to Mehmet Emin Örs's discussion APM esc calibration with joystick through Mission Planner
"Mehmet, you should find it to be very good, I have one for my indoor flyers and a small plane. It is good for up to about 400 meters range and has very well designed programming interface with plenty of flexibility. Best of luck."
May 15, 2016
Alasdair replied to Mehmet Emin Örs's discussion APM esc calibration with joystick through Mission Planner
"You will probably need more than just a joystick, there needs to be some way of controlling your singlecopter if it is to be flown, and you are not aboard. There is no need to spend a lot on a transmitter, something like a FlySky FS-T6 can be…"
May 14, 2016
More…