A climb-glide routine can potentially yield a useful increase in range compared with the same airframe/propeller/motor combination operating straight-and-level at best range speed point or best endurance point respectively.
Let me explain briefly with graphs of the results how I have come to that conclusion, at least theoretically so far, hopefully…Continue
The flying wing design I have been working on for some time now has been slowly evolving as I have learned more about aerodynamics and expanded my skill set with modelling tools of various forms. I have recently completely re-surfaced my design with new aerofoil sections and better, more consistent surface transitions and have been experimentally analysing the results…Continue
A very interesting and thought provoking explanation of why the conventional wisdom of elliptical lift distribution needs rethinking. Interesting for lovers of fixed-wing but also might be applicable for propellers and rotors...?
I tripped over this on my suggested links and thought it might be of interest to the DIYD crowd. Fascinating to see an original Macintosh being used as a ground station!
On Sunday I spent the morning self-consciously traipsing around my brother's neighborhood with an apparently wierd collection of hand-held electronics and foam in the form or my APM, battery and a Hextronic 3DR knock-off 915MHz telemetry radio and Skyfun fin. We left a laptop on the top floor of the house running APM Planner with the base station radio connected directly to the USB port and using a standard "duck" monopole…Continue
This smartphone-sized pocket battery is being marketed for emergency starting of cars with flattery-battery-syndrome, but if the manufacturers specs are believable it would make a fantastic power pack for quads etc. More than…Continue
I saw a feature about Mercedes-Benz collision avoidance vision systems research on the Telly here in Germany where I am at the moment.
This particular project uses two cameras to create stereo vision. Comparing the two images is used to detect pixels that represent motion that could be hazardous to the vehicles current path.
Since the topic of CNC mills has raised its head here, I thought I'd share this with the DIYDrones community.
One of the things those who are considering this need to be aware of is that the toolpathing of complex shapes isn't a trivial exercise. I would be interested to know if anyone has experience with any open-source surfacing toolpathing packages - please comment below!
I am fortunate to have access to MasterCAM V9 - old-fashioned as it is - but…Continue
Some who have followed my blog posts will know that I have been working on my HDwing design series for a return-to-launch glider concept using ArduPilot Mega. Everything I have revealed so far has been based on relatively conventional flying wing ideas. Till now...
This forward-swept flying wing concept was inspired by the work of Justin Ammon (EdgeRC / birdofprey) that I spotted on…Continue
One of the features of extreme high altitude flight is the high true airspeeds that are needed to generate the dynamic pressure required for airborne flight. To minimise these extreme speeds for my high altitude glider project, I wanted to increase the flyable operation envelope closer to the airframe's stall speed, helping the reign-in the stratospheric true airspeeds!
As I was playing…Continue
I've been working towards a realistic simulation of my high-altitude return-to-launch glider project in X-plane and this is the latest result which some here might find interesting.
The simulation is running with X-plane 9, APM-MP 1.1.36 (to keep the TAS into APM - more on that later) and a slightly modified version of ArduPlane 2.28.
To achieve the drop,…Continue
My ambition is to send APM aloft to the edge of space on the end of a balloon, and since it gets a little cold up there, I decided to take a look at what I would need to keep things running well.
NASA have kindly given the world a mathematical atmospheric model which shows that if I can meet the challenge at -56°C, I should be OK at any altitude. Here is the temperature of the…Continue
Thought I'd share my progress so far on an X-plane model of the Skyfun. I'm still struggling with PlaneMaker at the moment, so I've not flown it and have generated the data purely from scaling photographs knicked from t'interweb.
If you can help out with dimensions (metric please!) of things like the tail fins, chord lengths etc, that'd be great.
When it flies to some level of satisfaction, I'll release a version into the wild.…Continue
...well, in my dreams and in X-plane only so far.
It's been quite interesting trying to get a flying wing to fly at such high altitudes. There are all manner of complicated instabilities to overcome. So far, the biggest improvement was adding a motor and propellor, not as any form of thrust device, but as a gyroscopic stabiliser!
My project to build a ballon-launched high-altitude automnomous glider as a step up from the normal styrofoam box HAB projects necessitates the development of an airframe.
Initially, I was intent on using the Skyfun platform but my calculations and other's experiences of it as an FPV platform suggests that it will be difficult to keep the centre-of-gravity in a useable location, especially if I remove the motor to turn it into a glider...
When I spotted the clever…Continue
As part of my plans to make a balloon-launched, return-to-launch UAV glider, I was looking out for a HD video camera that I could use in a typical fuselage installation. I chose to invest my hard-earned into the Drift HD170 mostly because I figured the rotating lens meant that it was probably separate from the main processor board. Only purchase and disassembly would…Continue