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May 15, 2019, 11:37 PM
Registered User
Powercroco,

Love your work!! Looking forward to the full video and details.

Danny
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May 16, 2019, 03:21 AM
www.speedcroco.de
Thread OP
Thanks, but I'am only reporting about other persons work!

yesterday Sascha's dual-drive "galacto" was maiden.
it flies and the sound is incredibile.

may be, I will find a way to show the video I've got about it.
May 16, 2019, 05:58 AM
www.speedcroco.de
Thread OP
Galakto Erstflug (0 min 36 sec)
May 17, 2019, 09:31 AM
Airspeed is my drug
MikeRx's Avatar
Quote:
Originally Posted by powercroco
Love the sound!
Did this make 250 grams?

Here is a real 8s esc at 4.2 grams..
Kamikaze!
Not to throw shade, but I do not see any 4s drive outrunning my 8s that is turning a 3.5x5" prop at 50k. (40 amps/1200w+)
I have no way of knowing, but it really seems like 200 mph+. M
Latest blog entry: 250 gram auw speed!
May 18, 2019, 04:55 AM
www.speedcroco.de
Thread OP
yes, sascha's model is inside the rules with 2x4S.

about speed:

your numbers (3,5x5 with 50krpm) theoretically give a possible v85% speed of 323km/h = about 200mph.
we only will get know the truth by flying through the meassuring system.

btw: 3,5 x 5 at 8S will give the same speed as 3,5x10 at 4S.
May 22, 2019, 09:24 PM
Registered User
that little micro monster is AWESOME.
i need to learn to lay up carbon in moulds properly.
May 25, 2019, 09:27 AM
Registered User

Which Camera?


Quote:
Originally Posted by powercroco

Very cool Video. Which camera did you use for that?
May 25, 2019, 12:42 PM
www.speedcroco.de
Thread OP
I don't know about the camera, because of the vid came from HJK -Andi.

but I saw the "galakto" and some other 250g speeders at our annual Bad Wünnenberg speedmeeting.

from left to right:
- my (for old eyes made) 65cm wingspan "nanoblade" with 3 blade highspeed folder
-Jochen's 55cm "nanoblade",
- Daniel's 55cm "nanoblade",
- Sascha's 37cm "nanoblade" and
- Sascha's dual drive "galakto"
Jun 06, 2019, 12:08 AM
www.speedcroco.de
Thread OP
for the save transport of my little speeder I use a rifle case now.
Jun 09, 2019, 10:30 AM
www.speedcroco.de
Thread OP
may be, it's interesting for someone:

http://www.rc-network.de/forum/showt...=1#post4805219
Jun 10, 2019, 12:29 PM
Nitro Abuser
Amp Abuser's Avatar
Looks great reported 113g what is the wing span?
Would need to be more narrow for small nitro engines
Is it possible for him to remove some material and join
it together more narrow?

2nd page of the link shows a new one he has finished
the neon yellow is perfect for visibility.

Today, 12:43 PM
Registered User
Very nice class and good pictures! Inspiring.
I have started by getting a drive setup.
T mot F80.2500kv. measure Ri 33 mOhm on all 3 phases equal., and zero load current 2.2A at 10V
I calculate up to 87% efficiency on 4S, 32A, Astonishing for such a small motor.
Copper fill is very moderate, probably for air cooling. I think al lot more will fit in.
Motor weight is 39.26 gram incl prop nut.
Last edited by tjarko; Today at 12:46 PM. Reason: Adding picture
Today, 12:55 PM
Registered User
Also got a matching ESC from the drone department, F45A, very nice, capacitors on the pcb, extremely small and light.
A bit of trouble setting it up, no manual available. It should be connected to Tx first, 5V power, at full trottle. Then connect battery. It will make many many beeps, wait for it to get quiet. Then trottle back, and again wait for the beeps to stop. Then unplug. When started up at zero throttle it is ready.
At my first attempt my system had the Rx outputs mixedup, so i had mid range throttle all the way, ending up with a lot of confusion... I now check this first with a servo before i start programming an ESC this way...
Today, 01:01 PM
Registered User
Battery 4S 850 mAh... probably bigger than most use but my weight estimates say this should be possible.
Unfortunately all the good lipo,s in this size were sold out, so i opted for 2x a 6S, to be modified to 3x a 4S pack.
Unfortunately the mylipo packs can not be resoldered easy, so i get 2x 4S pack out of it.
Rearranged to 2S +2S inline. Then the ESC fits on top.
Connectors Kontronik silver, about half the weight of XT60..
101.1 grams...total.


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