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Feb 13, 2006, 05:21 AM
Registered User
Thread OP
Build Log

Micro-UFO, diameter of rotor: 4 * 45mm


my new smartflyer flies!

Flight video:

Weight: 20g
Length and breadth (without propellers): 66mm
4 motors and propellers from X-Twin
accu: 2 * 145mAh
4 channel infra-red receiver
Electronic with 3 gyro

Electronic data:
2 parts (power part and control part)
Weight of power part: 1g
Weight of control part: 2g
CPU: ATmega88
Gyro: 3 * ADXRS300

Information about my former projects can be found under my homepage

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Feb 13, 2006, 05:31 AM
Registered User
caseyjholmes's Avatar
Dude! wholy cow! that is freakin nifty! very cool. Got plans for drawing plans?
Feb 13, 2006, 05:43 AM
Registered User
you are going to be a rich man with a design like that!!! so simple!(kinda)
Feb 13, 2006, 09:29 AM
Registered User
Hi, that is a really cute flyer!!!

Too bad the gyro's are 30 bucks a peice. You need 3 1 for each axis, right? Is the reciever custom built or bought?
Those PCB's look professional.... you gonna kit it?
Feb 13, 2006, 01:23 PM
Micro Flyer, Big Poster
Pete P's Avatar
Wow, Nice!!
Feb 13, 2006, 02:35 PM
Gambler-AG DLG Designer
Allan Wright's Avatar
When will the controllers be available for sale, how much will they cost, and how many amps can each ESC handle?

Nice work!

P.S. Put me on the waiting list.
Feb 13, 2006, 04:01 PM
My member is not
Zlatko's Avatar

Very nicely done !!!

Looks like its IR control?
I didn't know X-twin had contra rotating props ...

Feb 13, 2006, 04:50 PM
Team30 Micro EDF
NitroCharged's Avatar
That was cool!

Well done Hartmut.
Feb 13, 2006, 05:47 PM
No more nicotine for me!
micro_builder's Avatar
that is pretty nifty work there. who knew four 6mm motors could lift 20 grams going direct drive?! i can already hear the toy companies knocking at your door very cool.


just out of curiosity, what are the flight times like?
Last edited by micro_builder; Feb 13, 2006 at 06:22 PM.
Feb 14, 2006, 04:49 AM
Registered User
great stuff! Inspiring article in Flug too.
Just a pitty that the cost of 3 piezo elements probably puts it outside the scope of the toy industry

Feb 14, 2006, 11:50 AM
Registered User
Great job ! I'v been trying to make somthing about this size ( still am), but I'm way behined...
Feb 14, 2006, 12:06 PM
Registered User
micro builder - I thought each of the aeroace motor + prop generated about 5g. Still, that is at full throttle = 20g and you don't want to fly a hovering object at full throttle just to get it off the ground. So either the thrust figures are wrong, or the saucer is lighter?
Feb 14, 2006, 12:07 PM
Registered User
can you give us some details about the 4 channel reciever?
Feb 14, 2006, 12:10 PM
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caseyjholmes's Avatar
It seemed like it shot up off the ground very fast, and he had to lower the throttle in a quick manner, so it looks like there is power to spare.

What is worth the weight in gold on this saucer is the program =)
Thats not easy to do while constantly reading IR inputs and smoothly transfering power between the 4 motors constantly as well. Very hard to nail on the head with 1 motor, let alone 4! The program on this thing must be incredibally complex

All this after figuring out if it is balanced enough with the gyros to fly itself before looking for user control input. I'm thinking there must be 50 variables in such a program, most of which probably have to be updated according to the gyros and user input every couple of clock cycles or milliseconds.

He is using two 145mah lipos, with which the aero ace gets about 10 min flight, but pulls less weight since it's not lifting directly up. With 4 motors and 2 145mah's, Flight times are more than likely 5-8 minutes.. Just a guess though?
The AVI Hartmut has posted was short because it was probably taken from a digital camera with a few second video ability.
Last edited by caseyjholmes; Feb 20, 2006 at 05:48 AM.
Feb 16, 2006, 01:33 PM
Registered User
Thread OP
Thanks for your interest.

Here is further information about the aircraft and the electronics:

IR Receiver:
The signal from the receiver is connected at the Capture input of the CPU and is then evaluated by SW.

The programme is written in C and is 6k bytes at the moment.

The control cycle is 1,5 ms
Course of control cycle:
feed in gyros repeatedly (in the interrupt every 100us)
Create control difference
PD controller
Distribute PWM

Flight Characteristics:
It reacts very sensitively to Nick and Roll. With practice steers like a normal micro helicopter.

Flight Time:
The flight time is limited by the the motors as these are hot after 30s.

I think that the electronics are too expensive to warrant marketing this as a toy. However I'm working on being able to buy single electronics or models at a better price. To do this the system has to be tested longer and optimized.


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