During 2001 i saw at rcline.de a picture of a homebuilt brushless
outrunner, made from a CDrom-drive and a few words, how to do this. I was impressed and sent a short mail to the autor.
He asked my for my real world adress and sent me one of these as a present.
To make a long story short, we are good friends today and try to meet whenever possible. This site is dedicated to Dieter,
who is the man behind the tools.
A short time after that the Mini-LRK hit the market. This was the first
kit widely available. After assembly, which was not so easy because of a few minor problems with the kit, the motor worked well.
The resulting motor has eight magnetic poles and six slots in the stator. The Mini-LRK was the motor for my
Daktari and here is an example of missions, that i used Mini LRK for:
Video: My-home-2003
At the end of the year 2002 the big german electronics- retailer Conrad
sold a small motor for the micro-price of EUR 2,20 (about USD 3,00). This contained a fine nine-slots stator, a bell with
a not so bad hard magnetic ring with 12 poles and two ballbearings. This material was base for several motors we built.
There is a superb page in german and english on the net for further informations: Powercroco.de.
Check it, one of the best pages regarding homebuilt brushless outrunners.
By stacking two Conrad stators one can build motors up to the 300 watts
input- class. Check this climb of my soarer E-soft with onboard cam: Climbing
The weight was around 1600 gramm including camera. This is another example of the last :-( flight of my yellow Highdecker:
Last flight. The BEC failed during flight.
Old defective or no longer used CDR- drives are a good source for
stators. Normally you can find stators with diametres between 19 and 24 millimetre, from time to time including
ball-bearings. Fired by two or three small lipo-cells these motors show good results with small foamies.
The small Horten-wing Variante 90 flies highly efficient with such a motor. Once i flew six minutes and recharged
only 53 mAH after that flight. The little Jet climbs easily vertical up to 70 or 80 metres on three lipo-cells.
These are Dieters newest works for the slowfly-sessions in Winter.
They weigh 5,5 and 7,4 gramm and are little jewels regarding precision and design. The slightly bigger one named Kisscatz
can turn a GWS 5x3 prop 11900 times a minute at 2,4 ampere on 2 lipo cells. Not bad :-).
It is march 2007 and Dieter sent me a new micro brushless motor. This one has only 3 windings and four poles and is therefore relatively easy to build. Weight is only 3,6 gramm, but power is enough to turn a STO 2,7 x 2,6 12200 times/minute at a single lipocell and a current of 1 ampere. There's more than enough power for a little BUMP with a weight of totally 23,9 gramms.
