UAV Project Summary
Since I started this blog, I have uploaded various bits on my progress and thought it prudent to do an update on where the project stands now.
In the startup post, I put up some goals for my project. Though I did not meet everything, I am fairly satisfied that I exceeded some expectations that took the project into a different direction.
Very Good Loiter time (1 – 2 hours)
I did not nearly make this target. I did approach a theoretical time of around 40 minutes with my initial designs. My current design is much heavier than anticipated with a much better payload than anticipated. The “mission profile” has also changed from flying around using FPV, and staying in the air for a very long time, to shorter missions to cover an area with aerial photography. With the more capable plane, I ended up reaching a practical limit of around 20 minutes.
Medium Range (3 – 5km)
This was an FPV target that I set. Since the plane’s focus move to aerial photography, I sort of abandoned FPV and only added it near the end again as a fun element. Even though I suspect that my FPV setup will reach at least half the target range, my 2.4GHz radio does not reach near that. The best I managed so far was around 800m. It seems as if I will have to switch to a long range radio setup if I want to go further. Since the plane has a full autopilot, can cruise at around 40km/h for around 20 minutes, it has a theoretical operating range of around 6km. I have however decided against letting the plane fly out of radio range and my fail-safe setting is to return to launch should I lose radio signal.
Pan / Tilt system for training the camera on a point of interest
This was achieved, but later removed. Since the plane’s focus changed, I simplified the FPV setup to a back-pack that can be easily removed.
Waypoint and orbit functionality, leaving the pilot’s concentration on operating the camera and not flying the plane at those times.
This was achieved and exceeded. The plane can take-off and fly fully autonomous. A telemetry link is also present that enables the operator on the ground to direct the plane on a map.
Since the original project targets moved a bit, I’m quite happy at the results so far. The plane performs very well as a cheap aerial photography platform. The autopilot acts as a very good safety-net for starting off FPV flight. I have given the controls to numerous people at the club to give them their first taste of FPV flying without real fear to the plane’s well-being. With the autopilot in Fly By Wire mode it’s practically uncrashable if I pay at least a bit of attention to the person flying it (barring of-course malfunctions to equipment).
The biggest limitation of the current plane is the inefficient airframe. It can carry a lot, but is very “draggy” and uses too much energy in cruise. I really want to move to a more aerodynamic airframe. Even though the current airframe can lift a lot, it’s internal space is really unusable to a big degree.
I am considering two airframes as a replacement:
This plane is built from the ground up as an FPV aircraft. It also has a down looking window for a camera. It gets good reviews from the community and friends using it. Internal space is huge.
- Around the same size as the airframe I’m currently using, so I can re-use the current airframe’s equipment.
- Efficient cruising
- Lots of internal space
- Easy to hand launch, or ground-takeoff
- FPV ready
- I won’t be able to fit a bigger still camera than I’m using.
- I won’t be able to fit a roll mount for the static camera for turn compensation.
This is a HUGE flying wing with a LOT if internal space. It gets very good reviews and is also personally recommended by a friend already using one for Aerial Photography.
- HUGE internal space that is easily accessible.
- Can fit a bigger camera
- Can fit a roll mount for the camera
- Needs beefier hardware than my current setup – need new motor and batteries.
- Can be tricky to launch alone
Due to cost, I’m leaning towards the Penguin as my replacement aircraft.