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Author Topic: Experimentation with electric free flight  (Read 807 times)
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dlasich
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« on: March 28, 2018, 11:17:59 PM »

After reading the E20 thread I came up with this 1st experiment.  I had a 720 coreless motor laying around and rather than an on-board timer, i thought I would use a micro esc/receiver with my Taranis rc transmitter and ultimately program a switch to turn on the motor for a 20sec run time.  A 1.9g servo could also be plugged in for a DT.  But to be honest it was quite fun to remotely control the motor just enough to hold altitude for example.  Might be fun in a scale job.  Wing and tail are made from foam plates (borrowed concept from endlesslift.com), and fuse is foam board.  The small prop doesn't have much torque affect and with lots of dihedral it was very stable and didn't take much trimming.

https://youtu.be/vx-YanDGLGI

Motor: https://www.ebay.com/itm/USAQ-720-Brushed-Motor-Set-4pcs-7x20mm-Coreless-Motor-with-55mm-Propellers-Set-/263000315413

ESC: https://www.banggood.com/2_4G-4CH-Micro-Low-Voltage-DSM2-DSMX-Compatible-Receiver-Built-in-Brushed-ESC-p-1072251.html?rmmds=myorder
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mike_st
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« Reply #1 on: March 29, 2018, 04:52:20 PM »

good idea! I bought a Taranis recently but haven't started to learn how to program it yet.
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dlasich
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« Reply #2 on: April 07, 2018, 10:22:04 PM »

Some pictures of prototype 2 waiting for test flight at 28 grams.  Have a servo installed for a DT, and set a run time of 10 second... but will leave it deactivated and use the throttle manually until I have it trimmed for a full power climb.
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wcstoddart
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« Reply #3 on: April 08, 2018, 05:55:37 PM »

Very nice concept. What servo are you using?

Chris
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dlasich
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« Reply #4 on: April 08, 2018, 08:04:19 PM »

Took awhile to find the right servo that fits the receiver :-)  It requires a nano JST connector (1mm spacing).  Low voltage 1.7 gram;

https://hobbyking.com/en_us/hk-5320-ultra-micro-digital-servo-1-7g-0-05sec-0-075kg-1.html?___store=en_us

Got a test flight in this morning before it got to windy..  I upgraded the motor to an 820 coreless and the climb is nearly straight up.  Looks very promising... and definitely alot of fun!

https://youtu.be/7knu62uFdKE
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