On a sunny day (Sat, 2 Jan 2021 18:05:23 -0000 (UTC)) it happened Martin
Gregorie  wrote in :

>On Sat, 02 Jan 2021 17:27:41 +0000, Jan Panteltje wrote:
>
>> Model flying I did too, from 31 Dec last year in the EU you need a drone
>> license...
>>
>Depends what you fly - I flew single channel RC for a year or to, then
>discovered free flight competition models, sold the RC gear and never
>looked back.
>
>No license is needed for free flight if the model weighs less than 250g.

I think it is: "Unless it has a camera" (most of those do however).

>Also lots more exercise than just standing there holding a Tx, especially
>if you fly F1A (tow-line launched gliders - the faster you run before
>launch the higher it gets after release).

LOL, well I bike a lot...

For me it is all curiosity, seemed interesting to write an auto-pilot
and that works very well.
It can be used for anything from rescue to warfare (drop a bomb).


>>  http://panteltje.com/panteltje/quadcopter/index.html
>> have not got the license yet, so my fireworks (also forbidden now) was
>> playing with a blue power laser 2 days ago.
>>
>I'd ban those (spoken with my pilot hat on) due to all the brain-dead
>idiots who think shining them at aircraft is cool.

This is the problem, there is ALWAYS someone who does bad things with things,
did you know you can kill somebody with a fork?
So now we forbid all forks (after the knives that is), same for
so many other things.
It is the wrong way to go about it all.
Also it is money sucking.
I got my radio ham license when it was free, after that now I have to pay like
30 Euro a year,,,
The drone license is not free, and in a few years your drone needs an ID
transmitter on the drone AND one on the remote,
so they can find where it is and the whereabout of who controls it.
If Russia did  it  it would be called ....?
Total control state, revolution is needed, I have the tech, much more than
this.
You see people rising up against the total lockdown, big party thing in France
I just did read, 2500 people together
in some hall, they chased the police out!


>Oddly enough, the main use my scope got was checking the battery
>condition for my Koster dethermaliser timers: These ran off a stack of
>four 50mAh NiCds and were used to bring the model down out of a thermal
>at the end a timed competition flight. They do this by putting 500mA
>through a solenoid for 10 mS - this releases a catch on the tailplane
>which puts the glider into a stable deep stall, turning it into a rigid
>parachute so it drops out of the thermal and usually lands without damage.

Nice system, nicads (I still have one that works) are a bit from the past these
days,
lipos work great for my drone, I tried liion (with power converter) but that
does not fly longer.
Then I tried a wire, and sure you can keep the thing in the air indefinitely:
 http://panteltje.com/pub/h501s_drone_remote_power_flight_test_1_IMG_6274.JPG
  note the thin coax over the fence, I send several hundred volt at 100 kHz,
transformed it down at the drone,
  the high volts at low current allows for a thin light coax.

Position of the drone using differential GPS is within a few cm stable.

http://panteltje.com/pub/h501s_drone_remote_power_test_ground_control_1_IMG_627
6.JPG
  with scope :-)

The drone side, the high voltage is transformed down by a ringcore transformer
to 7.5 V 10A
the high current rectifier diodes are on heatsinks in the air flow from the
propellers:
 http://panteltje.com/pub/h501s_drone_remote_power_drone_side_IMG_6278.JPG

Part of the 'lab':
 http://panteltje.com/pub/h501s_drone_remote_power_lab_test_IMG_6271.JPG


>Looking at the shape of the solenoid pulse was a great way of checking
>battery condition. A good, new battery showed a nice bathtub curve- 1.5v
>deep with an 8ms flat bottom and a 45 degree recovery slope. As the
>battery aged, the flat bottom got shorter and the voltage drop increased,
>eventually becoming a 4v deep triangle. I replaced batteries once the
>voltage drop exceeded 2.5v - the time I put into designing, building and
>adjusting a new model vastly exceeded the cost of a new set of batteries.

Designing 'tronics and playing with 'tricety I started at 4 years old,
became my job at some point.
It is fun.

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