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Feb 27, 2011, 11:38 AM
Micro Jet Pilot
Chris T's Avatar
Discussion

6'' Micro Squall (20mm EDF, Single Phase Sensorless Motor)


Hi guys,

I have been busy working on a new frame the last couple of days. Here it is...

Chris
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Feb 27, 2011, 12:03 PM
The 6 P principle works for me
elecfryer's Avatar
Very cool! Looking forward to a flight report! Is this an inside flyer?

Michael (if your not fryin, your not tryin!)
Feb 27, 2011, 08:28 PM
Registered User
Wow that is TINY!!! Can't wait to see it fly! Is this the smallest EDF ever?
Feb 28, 2011, 04:27 AM
Team30 Micro EDF
NitroCharged's Avatar
Yowsers! Lookin' real nice there Chris!
Mar 04, 2011, 05:36 AM
Micro Jet Pilot
Chris T's Avatar
Quote:
Originally Posted by norco kid
Wow that is TINY!!! Can't wait to see it fly! Is this the smallest EDF ever?

Hi,

As far as I know, there is no smaller jet out there. I think, that size is only possible with the special electronics I developed. So far the frame weighs exactly 4.9g. The servos will be around 1g both together, the current motor+rotor version is 2.2g, but dependent on the power level, a smaller magnet could be used and the weight could come down to approximately 1.5g. The electronics is below 0.5g and then there is only some glass, the canopy and the battery left. Total weight will end up around 15g. Don't know, which battery to use yet, but I figured the 120mAh cell of my solo pro helicopter fits perfectly in the front cell of the cabin. I could even build in the corresponding jack to swap batteries easily. My micros had a build in battery and charging plug so far, because there was no space for a removable battery. This will be a major advantage and will allow much more flight time.

Michael, this is supposed to be an outside flyer with the option of flying in large indoor places. We have to see how close I can fly it. This will depend on the power level.

I will present the results of the motor and controller soon...


Chris
Last edited by Chris T; Mar 04, 2011 at 08:37 AM.
Mar 04, 2011, 11:14 AM
Registered User
Hi Chris,

You are doing a wonderful job on the development of your 6' wingspan Squall. It should be a beautiful model!

I know that my 5.5 inch wingspan 5 gram 1/72 scale MiG 15 will be beat soon, but it is currently the worlds smallest EDF Jet!

Joe.
Mar 05, 2011, 03:26 AM
Micro Jet Pilot
Chris T's Avatar
Hey Joe, that is a beautiful model there!! I have seen it before here in the forum, but I wasn't aware that it is so small. Seems like you will keep the record for some time I could scale everything down on my model but the fan. I am still thinking of a way to produce 15mm fans. I will give my balsa fan a new chance though. First, I want to get this rather "large" variant flying, introducing servo control to that scale. There is room for improvement...

Chris
Mar 06, 2011, 11:11 AM
Micro Jet Pilot
Chris T's Avatar

New Motor


Hi,

here's the new motor I just finished:
Weight incl. fan: 2.2g
No load rpm: 75000
rpm with fan: 50000
Finally, I am getting some heat Need to hook up my watt's up for some real numbers, but I am getting closer to the desired power level...

Chris
Mar 06, 2011, 11:22 AM
that is COOL chris! do you have a link to some info on the single phase brushless motor? i've never seen that before.
Mar 06, 2011, 12:50 PM
Registered User
Quote:
Originally Posted by Chris T
Hi,

here's the new motor I just finished:
Weight incl. fan: 2.2g
No load rpm: 75000
rpm with fan: 50000
Finally, I am getting some heat Need to hook up my watt's up for some real numbers, but I am getting closer to the desired power level...

Chris
That's pretty wild, Chris. Did you make the impellers or are they available?
Mar 06, 2011, 01:15 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
Quote:
Originally Posted by jack hix
That's pretty wild, Chris. Did you make the impellers or are they available?
It is a modified GWS edf30 rotor.

What amazes me is the precision you and Nitro can achieve when boring out the hub. How do you center it so well?
Mar 06, 2011, 02:38 PM
Micro Jet Pilot
Chris T's Avatar
Talking about centering? That's what I am working on right now. This unit actually didn't come out as centered as the last one, which was perfect. The fan is a clipped edf30, I put a piece of aluminum in the lathe which had od identical to the id of the fan. Then I simply plugged the rotor on and lathed the hub off. The rim is the second one I did, both are not straight, it seems like the 0.7mm drill is not staying perfectly straight when going through the material. Same for the magnet spacer. The best I can do is to flip the parts and do the bores half way from each side. Better than doing it from one side. The lathe needs to be precise though. I still don't know if it is pure luck that the last motor runs so perfectly balanced without having done any balancing. I have to redo the rim to tell. This one was bored out from one side, which turned out worse.

Chris
Mar 06, 2011, 03:19 PM
Team30 Micro EDF
NitroCharged's Avatar
Very nice work Chris.
Mar 08, 2011, 11:50 AM
A.K.A sir Crashalot
methuso's Avatar
Try to let the drillbit stick out as little as possible so that it wont flex.i guess as little as 1mm would be enough.
/Ulf
Mar 08, 2011, 04:11 PM
Team30 Micro EDF
NitroCharged's Avatar
...and feed it in s l o w l y so it doesn't try to worm into the softest part as it drills in.


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