Historically, remote control aircraft were produced much like their early full-sized counterparts. Wooden structures were covered with adhesives and taut fabric membranes. Other techniques later came to the fore, with builders looking to foam and other materials. Of course, these days 3D printers are all the rage, so perhaps one can simply print out a whole plane? As [sahevaantaneja] discovered, it’s not that easy!
One of the foremost problems is the process of slicing. This is where 3D geometry is transformed into the G-code which defines the path taken by the 3D printer during production of a component. Slicer software is generally optimised for working with mostly-solid objects, and some tweaks can be required when working with thin-walled designs.
These challenges come to bear with an aircraft design, which, by necessity must be lightweight. [sahevaantaneja] does a great job of explaining the journey of discovery in which their design was optimised to work with conventional slicers. This allowed the various components to be printed without errors, while retaining their strength to survive in flight.
For many people the gateway drug to aviation is radio-controlled aircraft, and in [Andre Bandarra]’s case this led to paragliding. Now he has combined the two, turning his full size paragliding wing into an RC aircraft. (Video, embedded below.)
The primary controls of a paraglider are very simple, consisting of two brake lines that connect to the trailing edge of the wing. When a line is pulled, it increased drag on that side of the wing, causing it to turn. [Andre] connected the brake lines to two 3D-printed spools, which are each powered by a large RC servo that he modified for continuous rotation. These are mounted on a slim wooden frame that also holds the battery, RC receiver, an old electronic speed control to step down the battery power, and attachment straps for the wing. Without enough mass, the wing would just get blown around by the lightest of breezes, so [Andre] hooked a cloth bag filled with sand to the frame to act as a counter weight.
On the first test flight the wind was too strong and the sandbag too light, making it impossible to control. The hardest part of the flight is the launch, which requires the help of someone who knows how to fly a paraglider. The second test day had much better success. With only a slight breeze and a heavier sandbag, the contraption flew beautifully, floating slowly across the beach. He admits that there are a number of improvements he can make, but as a proof of concept using parts he had lying around, it was a roaring success.
For paragliding from flat ground, you can always strap a motor to your back, like the open source OpenPPG electric paramotor. For more crazy RC flying contraptions, also keep an eye on guys at [Flite Test].
Hovercraft come in all shapes and sizes. and while they’ve largely disappeared as a major commercial transit option, they remain popular in the hearts and minds of makers everywhere. [RCLifeOn’s] latest project concerns a compact, indoor-sized hovercraft piloted via FPV, and it looks to be brilliant fun.
The build consists of a 3D printed chassis, with a skirt cut out of a garbage bag and held on with press-fit clamps. Twin ducted fans are employed, one for propulsion, the other for levitation. A 5GHz FPV camera is nestled on top of the rear fan housing to provide a video feed for the pilot.
The craft was somewhat uncontrollable in initial testing. Tweaks to the weight distribution and the addition of a bigger rudder helped tame the rig. [RCLifeOn] also demonstrates a unique way of balancing damaged fan assemblies in the field; it’s a technique we’ll keep in the back of our mind for future use.
The trick to a good hovercraft build is light weight, big control surfaces, and a good skirt. You can even go off-book and use the Coanda effect, if you’re so inclined. Video after the break.
When [PeterSripol] was a kid, he made a simple sailboat from a scrap piece of 2×4 and some napkin sails. He’s not 8 years old anymore, but he decided he wanted to make another 2X4 sailboat using the skills he’s learned since he was a kid.
You’ll have to get past storytime and mice, but the build skill is evident. There’s a RC rudder, a keel with lead shot and overall it is a good looking boat for such a simple build.
Racing games have come a long way over the years. From basic 2D sprite-based titles, they’ve evolved to incorporate advanced engines with highly realistic simulated physics that can even be used to help develop real-world automobiles. For [Surrogate.tv], that still wasn’t quite good enough, so they decided to create something more rooted in reality.
Their project resulted in a racing game based on controlling real RC cars over the internet, in live races against other human opponents. Starting with a series of Siku 1:43 scale RC cars, the team had to overcome a series of engineering challenges to make this a reality. For one, the original electronics had to be gutted as the team had issues when running many cars at the same time.
Instead, the cars were fitted with ESP8266s running custom firmware. An overhead GoPro is used with special low-latency streaming software to allow players to guide their car to victory. A computer vision system is used for lap timing, and there’s even automatic charging stations to help keep the cars juiced up for hours of play.
RC cars are a great way to have fun hooning around. There’s plenty of laughs to be had racing your friends in the local grocery store carpark, ideally after hours. [Ivan Miranda] wanted to go in a different direction, however – and that direction was up. (Video embedded after the break.)
There are existing toys that can pull off a wall-riding feat, but they’re normally on a fairly small scale. [Ivan] wanted to go big, and so outfitted some seriously powerful brushless fans on to his 1/8th Rattler buggy from Hobbyking. After initial failure, a smaller scale model was successfully built and tested, before it was realised the full-sized build had the propellers on backwards.
With this oversight fixed, the car was able to drive on the ceiling, albeit in the limited space between the roof beams. It was somewhat less viable on the wall, struggling to stay stuck and having issues with suspension flex.
Overall, it’s a great application of mass brushless power to fight gravity – the same principle behind the multirotors we all love so much. [Ivan]’s put the same trick to use for getting around on a skateboard, too. Video after the break.
The build is a small, radio-controlled FPV trike. Instead of the usual skid-steer setup, the rear wheel is mounted on a pair of horizontal bearings which allows it to pivot left and right. A servo is used to control the rear wheel position, with a pair of tie rod ends used to connect the horn to the rear steering assembly. It’s not the only unconventional design choice, either – magnets are used to affix the top plate to the vehicle chassis, rather than screws or clips. For video, the user can mount either a small dedicated FPV camera, or a GoPro with the included mount.
Without any code or control details posted, we can’t be 100% sure how it all works. However, from the video, it appears that both front wheels are being driven at the same speed, with steering handled solely by the rear wheel. This is apparent when driving on a smooth surface, where the vehicle can be seen to slide when turning. While it’s unlikely this setup has many advantages over a simpler differential steering build with a caster, it does show that rear steering can be effective on its own.