Mini Funquad - RC Groups
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This thread is privately moderated by brontide, who may elect to delete unwanted replies.
Feb 04, 2013, 09:45 AM
Stop me before I build again!

Mini Funquad

The other 4 motors from the mini-H I decided to make a mini-funquad. I started with my super simple frame ( 2 arms overlapping in the center ) made out of 1/2 by 1/4 basswood, pinned it in place with a Flip 1.5MWC, used Plush 10a ESC's ( blheli 9.4 ), turnigy 1811 2900kv, and 4x2.5 props.

1/2x1/4x8" (x2) Basswood arms - JoAnne's ( ~$2 )
Witespy Flip 1.5 MWC ( ~$20 )
Turnigy Plush 10a ESC - BlHeli 9.4* (x4) HobbyKing ( $9 )
Turnigy 1811 2900kv (x4) HobbyKing ( $10 )
4x25 Props (x2) HobbyKing ( $2/6pc ) - Use 5x3 Gemfans, far less hassle and more thrust.

Misc items include Rx, 3s battery ( 30-40a rating, 800-1600mAh ), lighting, and connectors of your choice.

A few words of warning, the little props at high RPM are a bear to balance, but it is necessary to balance as best as can as well as enabling 42Hz LPF in the sketch. Without proper balancing the quad will behave very erratically and will probably be uncontrollable.

As can be seen in one of the pictures below it's AUW is under 300g and that is with 1600mAh battery. On my flight this morning I got 8.5 minutes and the charger put back in 1000mAh, so when the weather is not sub-0 I should be able to do 10 minutes per flight. In retrospect I should CA or hot glue the two arms in place, clean up the standoffs with some m3 nuts, and snip the wiring down to size but otherwise it's a blast to fly. Very stable flight pattern and responsive even with an oversized battery.

For the lighting I'm using basic 12v strips, I stripped the ESC and added a jumper from the ESC to strip to reduce the number of wires into the wiring harness.

* BlHeli 9.4 added some code to support very high RPM switching, I don't know if this would work with BlHeli pre-9.4 I have not tried. As always choose a flashed ESC platform of your choice, don't go with the Plush just because I listed it here.
Last edited by brontide; Feb 05, 2013 at 09:51 AM.
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Feb 04, 2013, 03:03 PM
Stop me before I build again!
Continued flying with a huge grin testing shows about 100mAh/minute with the 1600mAh battery. Rated for 25-50c, but seems to be drooping, since I'm getting alarms at 1000-1200mAh.
Feb 04, 2013, 09:40 PM
Stop me before I build again!
Did some cleanup and put some new props on. The gemfan 5x3s are a huge step up in performance and the stability, these props were decent out of the bag and took minimal work to balance.
Feb 04, 2013, 09:44 PM
Stop me before I build again!
Also cleaned up the standoffs. Now the FC is more secure with a m3 nut or spacer under each corner. The board is far more secure at this point and less likely to shift in the future.
Feb 05, 2013, 02:46 PM
Stop me before I build again!
Timing with gemfan 5x3's show 82mAh/min about ~%20 more efficient with these props! 1238mAh during a 15 minute session. I would go with smaller batteries, but I don't know how much I would save since I should probably shoot for higher C ratings.

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