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Posted by SSM | May 03, 2015 @ 05:04 AM | 5,666 Views
Was riding my bike and flying the Easy Glider around the Flinders Golf Course. Just a drop dead gorgeous evening.

Simon (who's at Flinders most weekends).

Great Evening Flight (1 min 1 sec)

Posted by SSM | Jan 03, 2014 @ 12:16 AM | 6,407 Views
Happy to show my seagull style glider. It's made from an eflypower EPO "Diu" flying wing kit. Hope you like this video of the maiden flights:

RC Seagull (3 min 58 sec)

Posted by SSM | Aug 30, 2011 @ 10:55 PM | 9,983 Views
My Binary 900 v2 is finally done - although I built it as a v1 without ailerons, just Rudder/Elevator.

The magnet on the nose can take more or fewer magnets on top, to adjust the CG (perhaps not new, but I independently came up with the idea).

As at 31 August 2011 - unflown!
Posted by SSM | Aug 17, 2011 @ 07:12 PM | 11,081 Views
I used an old "B" string from a steel string guitar - the steel miked up to 0.43mm and I used a piece 50mm long - 30mm of torsion spring and two 10mm 90 bends to go into the balsa. It seems to nestle in the hinge line OK when the mock elevator was on full "down".

It stands to reason that the longer the spring, the less the tension (with a linear relationship, I would guess - twice as long giving half the tension for a given angle of deflection).

By feel, 0.43 mm seemed about right to support "up" elevator at a decent speed, without over-taxing my proposed servo and string. But I also have an "E" string that's 0.35mm dia and it would be about 30 seconds work to swap that in to see if it's any better.

When the two bent ends are in the elevator and stab like this (ie, 30mm apart) there is some pressure on the hinge (tending to twist the elevator). To solve this, some bright person figured out that you can fold the whole "C" shape spring in half so the 90 bent ends go into the elevator and the horiz stab right beside each other -so no there's tilt tendency.


String and Spring (0 min 15 sec)

Posted by SSM | Mar 26, 2011 @ 04:33 AM | 9,015 Views
Here's the on-board video ....


Red Red Wine .mp4 (2 min 10 sec)

Posted by SSM | Mar 19, 2011 @ 03:49 AM | 10,871 Views
Well, I wanted to return a stray tennis ball to some kids playing in the tennis courts at the local park.

So I pick up the ball and place it on top of my Quad. The ball is on an upside down plastic sandwich box (to protect the works), with a very slight indent in it, a couple of millimetres deep, so the ball rolls around and can fall off at the slightest bump.

I take off with the ball on board and fly over the court, expecting the ball to roll off at any second, and fall down to the kids. It doesn't. I rock the copter back and forth a bit. No change on the ball. I increase the strength of the rocking. The ball sticks there, like it's glued. I fly the copter around, turning, stopping and starting. No effect. I zoom the Quad up and down. To and fro. Frantically stopping, dipping suddenly, whamming it into turns. The ball doesn't budge. "What gives?", I think.

I bring the copter back to earth and place a second ball on top, with the first one. The two balls cannot both sit in the indent, and so they're now really unstable. If I carry the copter in my hand, it's hard to keep the balls on top - they fall off really easily.

So I fly the Quad with the two tennis balls on top to a position back over the court. And I do the rockin' and rollin' and shakin' thing all over again - the works. The balls just laugh at this and refuse to drop down to the kids.

In the end, the only way I can get the balls off the top of the copter, inside the tennis court, is to land the Quad. The balls fall off the instant the copter touches down, The boys are amazed.

So what gives? It's something to do with the fact that every time the copter dips in a certain direction, it accelerates in that direction? And this acceleration perfectly balances the inclination, so the ball/s stay centered and don't fall? Even with all that starting, stopping, turning and zooming?


Here we go .... a later video ...

Whole lotta shakin.mp4 (1 min 40 sec)


Physicists?

shake
Posted by SSM | Mar 14, 2011 @ 01:45 AM | 9,667 Views
Here's an idea for angling your all-CCW props on a Quad - this one in "+" configuration.


Angles for all CCW props on a KK + copter.mp4 (0 min 20 sec)

Posted by SSM | Dec 14, 2010 @ 08:44 PM | 11,209 Views
Haven't even flown a copter with the KK board yet and now I've gone and built myself a WMC board (WiiMultiCopter).

Kinderkram on RCGroups has done a great BuildLog that I am following.

I do believe that I'll disassemble the standalone gyros off the "Even Simpler Quad", shorten its arms, and use this board to fly it.

In the picture below, the small blue board is the Arduino Pro Mini (which basically is an ATMEGA 168 or 328 chip and ancillaries - we use the 328, 5v, 16MHz version), the small green board is the "guts" of a clone version of the WiiMotionPlus (which provides the three gyros in one unit), and the round Olive coloured board is the WMC adapter board from MultiWiiCopter.com, that keeps it all neat.

Quinton at MultiWiiCopter.com is great to deal with.

The Motion Plus is a great way of getting your three gyros for about $10. You can even add accelerometers to this board for a few dollars, by adding the guts of a clone Nunchuk. Barometer-based altitude hold is nearly ready for this board and maybe GPS will follow!

It's great fun programming the Pro Mini - and the GUI (Graphical User Interface) that Alex has provided allows you to see in real time how the gyros are working and to configure the firmware for your own style of flying.

.
Posted by SSM | Nov 30, 2010 @ 04:36 AM | 10,749 Views
and now a short on-board video from the Little "T"

Little T.mp4 (0 min 52 sec)

Posted by SSM | Nov 14, 2010 @ 02:43 AM | 11,197 Views
Q. How do you fly a tricopter with no yaw servo?

A. Add a motor, and build it as a Quad!


Here's the second flight of "Even Simpler Quad".

The only "electronics" are the 4 gyros and 4 ESCs. Nothing else.

It's a tricopter x 1.33. You can ditch the yaw servo and the yaw pivot.

No yaw servo, no yaw gyro, no tilting motors.

The "tilt" on the gyros means that the gyros stabilize both the up-and-down of the arms and the yaw!

I upped the yaw control authority after the maiden flight and now she flies like a dream ... and still rock steady.

NO electronics, NO board, only 4 gyros, 4 ESCs and 4 motors.


Even Simpler Quad 2.mp4 (5 min 21 sec)

Posted by SSM | Nov 01, 2010 @ 08:04 PM | 8,438 Views
Here's the maiden of the Simplest Quadcopter Ever.

No fancy flying because: (1) control response is extremely slow, especially yaw; (2) I had to fly holding in some left yaw; (3) it was the maiden; (4) I was flying in my garden beside my wife!

Even Simpler Quad - maiden.mp4 (1 min 48 sec)


Very stable. Needs to be less stable and more responsive.

Remember, this Quad only has 4 motors, 4 ESCs and 4 gyros. Nothing else.

Also - I'm cheap. I use tilted motors instead of pairs of CW and CCW props.
Posted by SSM | Oct 24, 2010 @ 04:31 AM | 7,897 Views
There may be a Hexacopter in my future .....

....
Posted by SSM | Oct 03, 2010 @ 06:14 AM | 7,651 Views
Peter (aka "Scorpia" on RCG) kindly got me straightened out, so now I am able to program the KK board with Tri, Quad, or Hex software. Once you get it figured out, it's really easy and only takes a few seconds!

I ended up using "Extreme Burner" to program the chip because that seemed to work with my $12 USB ISP AVR programmer much more easily than AVR Studio (which I could not get to work at all).

No photos for this, but I also bought a v.5 SMD KK board from Peter, so I can try my hand at soldering on the SMD pots.
Posted by SSM | Sep 11, 2010 @ 09:26 PM | 6,725 Views
OK, I've made my first KK board. I've not tested it yet. I may be slow getting this running because I have a fair bit of travel for work coming up ....

You may notice that I put headers in for 6 motors. So I may build this as a Hex - which would not be practical to make using Signguy tricopter principles!
Posted by SSM | Aug 24, 2010 @ 07:03 AM | 5,527 Views
It was one of the last of Melbourne's winter days, and Simple Quad was just begging to be taken out and flown. What a joy it is to fly!

It's been repaired so many times now that it's starting to show a bit of the dreaded Jello ....


Walk Don't Run - Simple Quad.mp4 (2 min 35 sec)

Posted by SSM | Jul 24, 2010 @ 10:57 PM | 4,473 Views
It was a lovely morning as the fog was lifting ...

Untitled (7 min 3 sec)

Posted by SSM | Jun 21, 2010 @ 06:34 AM | 4,704 Views
Night Flying. This was an early experiment. Looks promising - I think I'll be trying more.

Had to stop after these two because of a minor equipment malfunction!
Posted by SSM | Jun 19, 2010 @ 08:25 PM | 4,258 Views
I rewound my four AXN 2210 1000kv motors for my Simple Quad. After the rewind, all four motors ran beautifully and sang sweetly.

A couple of weeks ago I went for a short flight and regrettably pirouetted into a tree - resulting in a minor crash.

The damage seemed minor and she was back ready to fly in a few minutes - just needed to replace a few broken cable ties.

But one of the AXNs then had "issues". Nine times out of ten it started up real rough (if it starts at all), hesitating, clicking, running like it has sand in it, never really getting going, especially with the prop fitted. Once in a while it would start up smooth. Even when it started rough, by manipulating the throttle and "revving" it up and down (trying to "catch" it into the smooth running by judicious use of throttle), I could usually get it to smooth out and it then it will sing sweetly like it should. But 90% of the start-ups were something horrid. And if I slowed the smoothly-running motor down too much, it stopped altogether and hiccups all over again on getting going.

Flying - once I got the motor running smoothly, seemed uneventful. But I didn't trust it. I felt that if should throttle right off, it might not run up again cleanly.

It wasn't the Rx, gyro or ESC because another motor in its place worked as it should. And the offending motor on another separate ESC set-up showed the same sypmtoms. It seemed worse with the prop on, than with prop off. On close inspection, the wiring seemed intact and there was no apparent physical damage to the winds, or connections. The lead-off wires don't seems to be touching copper-to-copper anywhere. All three pairs of leads show about the same DC resistance, best I could measure them. The bearings are OK, the shaft is true, and the can is reasonably balanced. There's no grit in it!

But now I know what the problem was!

And a picture tells 1000 words:
Posted by SSM | Jun 07, 2010 @ 04:35 AM | 4,282 Views
Note to self: Quads and Trees may not be the ideal mix!

Crash of the Simple Quad (1 min 27 sec)