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Old Feb 24, 2015, 05:07 AM
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Cool
260mm wingspan micro aerobatic plane

Hello all !

After the "big Bandit F3P" (http://www.rcgroups.com/forums/showthread.php?t=2304194) I present the "micro Bandit" under construction.

260mm wingspan
291mm lenght

Electronic I use :

Props : MCF3222 (microinvent)
Motor : 2g Hextronik brushless (winding modified)
Esc : MBC3 (microinvent)
RX : Deltang RX31
Lipo : Turnigy nano-tech 60mah
Servo : home made

Final weight estimed : 8~9g

To be continued...

Regards,
Mickael
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Old Feb 24, 2015, 05:30 AM
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Wow, that looks amazing. Will you be adding any carbon rods to reinforce the structure?

When will servo kits be available?
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Old Feb 24, 2015, 09:23 AM
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He has to get his exam before !! Félicitation Diablo, tu envahis le marché américain !!
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Old Feb 24, 2015, 04:10 PM
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Amazing is right, so are those servos.

If you put another hole at the other end of that pivoting arm it looks like a great aileron servo.
You should check this Thread for your 2gram motor.
http://www.rcgroups.com/forums/showt...=895413&page=3
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Old Feb 24, 2015, 04:35 PM
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Nice , plane and nice little servos.
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Old Feb 24, 2015, 06:30 PM
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nano servos

Looks like you got the servo weight down to 0.67 grams which is great. I like
your use of hall sensor/ small magnet for servo positioning. What motor are
you using dia & length.
You might take a look at the motor (3.2mm dia) and threaded shaft used
on Mini Vapor servo mechanics this should allow you to reduce weight
even more. The mini servo mechanics including motor are still available
on ebay. Let us know if you can supply the mini boards you have designed.
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Old Feb 24, 2015, 09:58 PM
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in persuit of low wing loading
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Excellent work on your skeletonized foam airframe (and in your other thread). You are doing amazing work on "skeletonized" linear servos. And, I like your method of converting the action to move a large bell crank for the ailerons.

Any further detail on the servos would be much appreciated. Are you injection molding those housings yourself? And, I assume those are custom boards to control them. Do you have an incredible workshop, or are you subbing out the pieces and assembling them yourself? Any plans to sell them, or kits for them?

Again, just amazing work.

Are you happy with the Micro Invent controller? When I did my AirBender a few years back I used a MI controller with a Gasparin motor. I was not happy with the way it behaved. When throttling back it would cut off at about 30% to 40% throttle, which was pretty abrupt. It was a very light but I didn't think the motor control was as smooth as it could be. I suppose it is possible they have improved their controller since then.

http://www.rcgroups.com/forums/showthread.php?t=1189227

On my current project I'm using the YGE controller. It is heavier. But, I've found them to be very efficient, and have very smooth control. It's possible to throttle back to virtually zero throttle and still get very smooth control.

http://www.rcgroups.com/forums/showthread.php?t=2306529

Gordon
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Old Feb 25, 2015, 03:42 PM
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Quote:
Originally Posted by epilot View Post
Wow, that looks amazing. Will you be adding any carbon rods to reinforce the structure?
Yes 0,5mm carbone rod or 0,3mm (I do not know yet) for reinforced the wings.

Quote:
Originally Posted by I R Irv View Post
If you put another hole at the other end of that pivoting arm it looks like a great aileron servo.
You should check this Thread for your 2gram motor.
http://www.rcgroups.com/forums/showt...=895413&page=3
The servo has two hole on pivoting arm.
He is a pivoting servo
Thanks for the links.

For interested person, this is my test result with 2g brushless :

My config test :
Props : MCF3222
ESC : MBC3
Lipo : Turnigy nano tech 60mah 45C

1) 14T 0,2 : 2,2A ~17,5g (original engine)
2) 30T 0,1 : 0,8A ~9g
3) 20T 0,1 : 1A ~10g
4) 17T 0,1 : 1A ~10g
5) 17T 0,2 : 1,6A ~15g

I have not mesured the RPM...
I have retained solution "5"

Quote:
Originally Posted by scharlach View Post
Looks like you got the servo weight down to 0.67 grams which is great. I like
your use of hall sensor/ small magnet for servo positioning. What motor are
you using dia & length.
You might take a look at the motor (3.2mm dia) and threaded shaft used
on Mini Vapor servo mechanics this should allow you to reduce weight
even more. The mini servo mechanics including motor are still available
on ebay. Let us know if you can supply the mini boards you have designed.
I made 0,5g prototype, but not very reliable.
Current servo are reliable, (I think...not tested in endurance for the moment...) good wear resistance because it use balls bearings...brass piece...(I have made a few prototype before find a good mechanical solution !!)

Yes, I use hall sensor (allegro A1393) with small didel magnet (Ø1,2x0,8).
I use the motor and gear of mini vapor servo mechanic (PKZU1236)
I got the worm gear and brass piece on a 1,1g servo (HK).

I would like to clarify : I'm not the designer of electronics ; It's "uGlider" on RCgroups forum. I just designed the mechanics. Originally the servo are designed for micro glider. I juste worked with "uGlider" for adapted the micro servo for my utilisation. (thank you to him !!!)

Quote:
Originally Posted by Gordon Johnson View Post
Any further detail on the servos would be much appreciated. Are you injection molding those housings yourself? And, I assume those are custom boards to control them. Do you have an incredible workshop, or are you subbing out the pieces and assembling them yourself? Any plans to sell them, or kits for them?

Are you happy with the Micro Invent controller? When I did my AirBender a few years back I used a MI controller with a Gasparin motor. I was not happy with the way it behaved. When throttling back it would cut off at about 30% to 40% throttle, which was pretty abrupt. It was a very light but I didn't think the motor control was as smooth as it could be. I suppose it is possible they have improved their controller since then.

http://www.rcgroups.com/forums/showthread.php?t=1189227

On my current project I'm using the YGE controller. It is heavier. But, I've found them to be very efficient, and have very smooth control. It's possible to throttle back to virtually zero throttle and still get very smooth control.

http://www.rcgroups.com/forums/showthread.php?t=2306529

Gordon
The structure of the servo is mix between 0,5 and 0,3mm carbone plate.
All piece is cutting with CNC by a french workshop. (frcraft)
No kit available. But I have possibility, if you are interested, post a .zip file with all file for build the servo. (If I have the time ...)

It's my first Micro Invent controller, for the moment I just try in static test, he looks very well.
I have choice the Micro Ivent controller because is very light and very small !

I like your "Airbender" very beautiful, very good work !
I will read the post quietly.

PS1 : I joined a few pictures "en vrac" first prototype...under construction...etc...
PS2 : Video of my servo's visible on my YouTube channel https://www.youtube.com/channel/UC2R...MkesmnEig3rqJg
PS3 : Sorry for my verry bad english
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Old Feb 26, 2015, 03:22 AM
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Electronic installation in progress....
I have no rush carbon 0.5mm in stock...
He'll have to wait to continue this weekend
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Old Feb 26, 2015, 03:59 PM
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Hello

What is the size of your servo?

Charles
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Old Feb 27, 2015, 02:16 AM
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For Charles
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Old Feb 28, 2015, 05:09 PM
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Ready to fly !

Weight : 8,2g
Wing loading : 4,4g/dm²
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Old Feb 28, 2015, 05:33 PM
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splendide ! Là tu les as mouchés les ricains !! Tu l'as testé ?
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Old Feb 28, 2015, 06:13 PM
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That came out excellent in every way. You have set the bar for micro F3P planes. Your workmanship is very good. Looking forward to hearing how it flies, and maybe a video if you can.

Gordon
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Old Mar 01, 2015, 05:45 AM
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Good luck with the maiden flight.

If you find you need more power, then a geared 6mm motor will give you more thrust at lower amps. The weight is app. that same as BL motor + BL ESC. The 6mm motor and gearbox from AEO RC is 2.3grams.
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