Micro heli and 3D-capable plane from e-Flite 
Monday, November 30, 2009, 01:18 PM - Flying Contraptions
e-Flite has come up with two interesting products: the Blade mSR ultra-micro helicopter, and the 4-Site ultra-micro 3D airplane.

The Blade mSR comes in an a "bind-and-fly" version for $150 (requires a separate Spektrum 2.4GHz DSM-compatible transmitter), and an RTF version for $180 (which includes a transmitter). The rotor diameter is 180 mm, and the mass is 28 grams. It uses a 120mAh single-cell LiPo battery.
It's available from Hobby Lobby, and from Red Rocket Hobby.

According to some reviews, the Blade mSR is the first single-rotor (non-coaxial) micro-heli that flies well. Most single-rotor micro helis have a separate motor for the tail rotor. These motors have relatively long reaction times, which makes the heli rather difficult to fly (they will rotate every time you increase or decrease the throttle). The Blade mSR is so tiny that the inertia of its tail rotor is very small, and the reaction time is very short.

The 4-Site Ultra-Micro comes in 2 version: "bind-and-fly" for $170, and "PNP" for $110. A Spektrum DSM-compatible transmitter is required. The wingspan is 386 mm, and the mass is 35.5 grams, with a single-cell 150mAh LiPo battery. e-Flite has other such small planes, but this is the first 3D capable ultra-micro from them. The plane includes a 5-in-1 P board with a 2.4GHz DSM receiver, a brushed speed controler, and two linear servos. Two additional servos for the ailerons are pre-mounted on the plane.
It's also available from Hobby Lobby, and from Red Rocket Hobby.


2 comments ( 180 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3.1 / 221 )

Shrediquette: an Arduino-based Tri-copter 
Monday, November 30, 2009, 01:02 PM - Flying Contraptions
The Shrediquette is a tri-rotor helicopter built by William Thielike from Germany. William is a PhD student in biology, who seems to have many talents: micro-controller system design, control, mechanical design, flying contraption construction, as well as film making.

His tricopter is built around an Arduino Pro Mini micro-controller. Oddly, William didn't use the Arduino development tool and C/C++ programming language: he wrote his software in Bascom, a dialect of BASIC.

The yaw control is performed by rotating the tail boom with a servo. This very unlike the more conventional servo-less yaw control of quadcopters, but it's practically unavoidable for tricopters.

Much of the material is available for download, including the schematics, the PC board Eagle files, and the Bascom source code.

An awesome video (below) shows the capabilities of the tricopter.
More videos from William are available on Vimeo.

Tricopter - The Movie... from W. Thielicke on Vimeo.

Thanks to Bertrand for the link.

2 comments ( 58 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 7854 )

eRC Micro P-51 Mustang RTF for $99 
Tuesday, November 3, 2009, 12:05 AM - Flying Contraptions
Hobby Lobby has the eRC Micro P-51 Mustang for $99.00. The diminutive ready-to-fly warbird has a 37 cm wingspan, weighs 30 grams, and comes with a 4-channel 2.4GHz radio. The plane has proportional control for the ailerons, elevator, and throttle. It uses a geared brushed motor.

Apparently, there is no rudder control as with the similarly sized Kyosho Minium Piper Cherokee. But the Minium is $180....

They will be rolling out a spitfire in December.
2 comments ( 204 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 2.9 / 6587 )

Hydroptere sails at over 100km/h 
Saturday, October 10, 2009, 09:58 PM - Flying Contraptions
On September 4th 2009, L'Hydroptere, a sail-powered hydrofoil beat the speed record for a wind-powered watecraft with an average speed of 51.36 knots over 500 meters. The boat reached peak speeds of 103 km/h. Back in 2008, it briefly reached over 110km/h shortly before it capsized. L'Hydroptere has been in development since the early 90's under the leadership of Alain thebault. This idea was born in the mid 70's following a discussion between a group of aeronautical engineers and French sailing legend Eric Tabarly.

The previous 500 meter record was held by French kitesurfer Alex Caizergues at 50.57 knots.


1 comment ( 118 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 2572 )

Our Experiments with Engine Sound Synthesizer for Electric Airplanes 
Monday, September 14, 2009, 11:55 AM - Flying Contraptions
Back in 2005, my dad Jean-Claude and I set out to build an engine sound generator that could be mounted in an electric model airplane. This would allow scale models to not only look realistic, but also sound realistic, more realistic in fact than gas-powered model airplanes.

Other people have built engine sound generators before, but my dad's idea was to synchronize the pitch of the sound to the speed of the propeller.

After some semi-succesful experimentations with simple eeprom-based circuits, we built a sound synthesizer using a microcontroller module with some custom software. The module was a Tini2138 from New Micros, which has a 60MHz ARM7-TDMI with 512KB or eeprom (plenty of room for sound samples), and a 10-bit DAC.

We succesfully tested out the system in the summer of 2006, but I only got around to writing a page about it just now, though the pics and videos have been available in my gallery since summer 2006.

The system worked quite well, but it's rather bulky and complicated to build for the average hobbyist. We are now developing a new version based on the hugely popular Arduino microcontroller platform. The new system is considerably more simple and lightweight, and will fit into small park-flyers. Stay tuned....
2 comments ( 187 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 2510 )

Flymentor3D: Vision-Based Flight Stabilization for R/C Helicopters and Airplanes 
Thursday, September 10, 2009, 02:21 PM - Flying Contraptions
Chinese manufacturer Shenzen KDS Model Technologies proposes a new type of flight stabilization system for model helicopters and airplanes called the Flymentor3D. Instead of the usual separate gyros, the system uses an all-in-one IMU (not clear if it contains a 3-axis accelerometer or just 3 gyros), and a CCD sensor with a vision system. The CCD camera points down and can detect movements relative to the ground, presumably using some sort of optical flow calculation. The processing involved is similar to what takes place in an optical mouse, and in fact, I suspect they use the same chips.

There is a downloadable manual in PDF for more details (in semi-non-broken English). Unfortunately, no price is given on the KDS website.

The nice thing about vision-based stabilization is that there is no drift, unlike with gyros and low-cost IMUs. The helicopter will stay exactly in the same place with the same heading for as long as you want.
3 comments ( 188 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3.1 / 237 )

Air Hogs Switchblade 
Thursday, September 10, 2009, 02:12 PM - Flying Contraptions
Air Hogs will be releasing a new R/C flying contraption in the next few days: the Switchblade. It's bi-motor flying wing with no servo. The pitch is controlled by the motor power, and the yaw by the difference between the powers of the two motors. The unusual thing is that the two half wings can be rotated and clicked in place so as to form a large rotor. The plane can then take off vertically as a helicopter (probably without any meaningful control, except altitude). Once in the air, the two half wings can be unclicked into a regular flying wing configuration and the Switchblade can be flown like a regular plane. One problem seems to be that the plane seems prone to get into steep dives right after the transition from helicopter to flying wing. The absence of an elevator control surface makes if difficult to escape the dives.

Amazon has it for pre-order for $70.

There is a test video on YouTube.



3 comments ( 137 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3.1 / 232 )

Flapping wing micro-UAV from AeroVironment 
Thursday, July 16, 2009, 10:08 PM - Flying Contraptions
AeroVironment has developed a flapping wing micro-UAV under a DARPA-funded project. The prototype made a 20 second radio-controlled flight. There is a video on YouTube, and a short description of the recent milestone.

This is probably the work of micro-RC pioneer Matt Keenon, who works at AeroVironment.



1 comment ( 35 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 3866 )

Huuuge collection of 3 views 
Saturday, June 6, 2009, 04:09 PM - Flying Contraptions
Bertrand pointed me to this positively gigantic collection of airplane 3 views at rcgroups.

They even have one of my favorites: the obscure the coleoptere.

1 comment ( 76 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 220 )

cyclogyro 
Thursday, May 14, 2009, 07:06 PM - Flying Contraptions
There seems to be a renewal of interest in the heretofore abandoned concept of the cyclogyro

The cyclogyro has two rotating sets of "paddles" whose angle of attack is cyclically modified to create lift in the desired direction. The principle is well described by the animation in this Wikipedia article.

There is a YouTube video of a thethered micro-size cyclogyro, which was designed at the National University of Singapore. A detailed description of the design is available here.

A team of Japanese roboticists has apparently revived the concept, using a "pantograph" mechanism to vary the angle of attack (link to IEEE Tans. Mechatronics article),
and a short description with pictures on PhysOrg.

I'm somewhat doubtful of the efficiency of the design, but it looks like a fun thing to build.

There is a number of article on the web that describe 1930's designs for cyclogyros. I am somewhat surprised that none of these designs seem to include an anti-torque system. These paddles are bound to generate a high torque that would make the vehicle pitch up (which is why the cyclogyro on the YouTube video has a propeller in the back).


1 comment ( 66 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 2689 )

Micro RC Spitfire RTF from Plantraco: 1.7g and 15cm wingspan 
Thursday, March 5, 2009, 07:47 PM - Flying Contraptions
Micro RC manufacturer Plantraco has a Ready-to-Fly 1/72 scale RC Spitfire, with a wingspan of 15cm, and incredible weight of 2.7 grams. The plane is available for $99 including the radio. It uses a 4mm coreless motor with a 32mm prop, a 0.38g 2channel receiver (rudder and throttle), a 0.07g rudder actuator, and a 0.95g 20mAh lipo battery.

258 comments ( 30333 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 235 )

Jump Jet quadrocopter available at Hammacher-Schlemmer 
Thursday, November 6, 2008, 07:10 PM - Flying Contraptions
The Jump Jet quadrocopter that we mentioned early October is available in the US for $120 at Hammacher Schlemmer.

They also have the Flying Saucer quadrocopter for $80.


1 comment ( 181 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 5906 )

Kyosho 4-channel Minium AD: Piper Cherokee and Micro Heli 
Friday, October 24, 2008, 01:30 AM - Flying Contraptions
Kyosho has been distributing the Minium series of micro-R/C aiplanes for a while. The Minium series combine a 410mm wingspan micro-R/C airplane, with a 3-channel 2.4GHz radio at a low price.

The new Piper Cherokee Minium has 4 channels (with ailerons!) with a 410mm wingspan and a mass of 26 grams. Availability is announced for November on the Kyosho web site.

There is also a Minium AD micro-heli, which is a 200mm rotor, 30 gram, full-function heli with 4-channel control.

The Kyosho America online store has the Piper and the heli on pre-order for $180, with delivery in late November. Strangely, some other US retailer has the Cherokee available on pre-order for $170 with expected delivery in late January 2009....

The YouTube video below shows other Minimum planes, some of which don't seem to have been announced.



2 comments ( 127 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 2.9 / 2568 )

How parrots fly: rotating feathers 
Friday, October 24, 2008, 01:13 AM - Flying Contraptions
I was watching an amazing set of slow motion movies and pictures of parrots in flight, and suddenly realized why birds have feathers. I've always thought feathers were a kind of kludge, an accident of evolution. But the videos clearly show the advantage of feathers. The large feathers at the trailing edge of a parrot's wing are flat and overlap slightly, forming a solid trailing edge on the down stroke, like the blades of a closed venetian blind. But in the up stroke, they rotate in such a way that they slice through the ambient airflow. The trailing edge now looks like open venetian blinds. The drag in the upswing is therefore considerably less than the thrust in the upswing. I'm guessing this effect is more pronounced in slow flight where the wings are moved forward in the down stroke and back in the upstroke so as to create more lifts at slower air speed. It's the equivalent of flaps in an airplane. It's a neat trick. None of the R/C ornithopters do this.
1 comment ( 114 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 3350 )

Your next flying contraption made of buckypaper? 
Monday, October 20, 2008, 02:03 AM - Flying Contraptions
Buckypaper is a thin "paper" made of carbon nanotubes. It will be a while before it becomes widely available (at a reasonable price), but someday, your ultralight/ultrastrong micro-RC flying contraption might be made of buckypaper.

Buckypaper is being developed at the High-Performance Materials Institute at Florida State University. It is 10 times lighter than steel and, in theory (not yet in practice), 250 times stronger.


1 comment ( 113 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3.1 / 165 )

R/C fish blimp: peaceful 
Friday, October 17, 2008, 04:47 PM - Flying Contraptions
Bertrand pointed us to this nice video of an R/C "flying fish". It's a blimp
with an oscillating tail for propulsion and fins
for directional control. Peaceful.


Air Art from flip on Vimeo

It is reminiscent of the Festo Manta Ray blimp that appeared a while ago.

3 comments ( 154 views )   |  0 trackbacks   |  permalink   |  related link   |   ( 3 / 2566 )


Back Next