Indoor Free Flight Electric Models - RC Groups
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Jan 04, 2018, 08:00 AM
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slowmatch's Avatar
Discussion

Indoor Free Flight Electric Models


I've been messing about with a sport indoor model for indoor electric free flight using a Peterborough FET timer.
http://peterboroughmfc.org/technical...e_FETtimer.htm

Here are a few similar models:
http://peterboroughmfc.org/membersmo...lswithdiff.htm


The components for this one are a 6mm pager motor from an X-Twin, FET timer and 1S 50mAh full river cell.

Wing span is 280mm (about 11") so you can print it on A4. The whole thing is 2mm depron with decoration provided by cheap waterproof marker pens. The canopy will be vac moulded.



Anyone else playing with electric free flight?






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Jan 04, 2018, 12:35 PM
Registered User
The plane is a real sweetheart! Have you been flying these long ?
Jan 04, 2018, 01:08 PM
Indoor FF is pretty neat
funwithplanes's Avatar
Post this on the freeflight forum as well! I have played a bit with capacitors but have not had much luck. if you ever decide to make plans you should post them on the scratchbuilt indoor and micro models section, i'm sure that some would convert it to rc as well.
Jan 05, 2018, 09:19 AM
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slowmatch's Avatar
Quote:
Originally Posted by wim5150
The plane is a real sweetheart! Have you been flying these long ?
Thanks I've used FET timers in competition free flight (outdoors) but this is my first 'micro' design. Some of the guys in my club developed the FET timer and have more experience with small depron models (as shown in the article.) I designed this in CAD so plans could be drawn up easily enough if it flies ok.


Funwithplanes, I've also played with capacitors as a power source but because they are constantly 'powering down' the time that you have usable thrust can be limited. The beauty of the little Peterborough FET Timer is that it switches on a proper lipo/motor circuit so the thrust is constant for the timed run. The timers can be built to about 1g without wires but they will handle quite a lot more in terms of model size - up to about 10A and 3 cells.

I was hoping to test this at our indoor meet tomorrow but I just pulled a wire out of the FET and can't solder it insitu :/
Jan 10, 2018, 07:09 AM
Registered User
thanks slowmatch. Can you tell me where you find the materials shown in the last picture ?
I've been trying to find small round pin and sockets, and a good charger for small LiPos.
Jan 10, 2018, 08:35 AM
Registered User
slowmatch's Avatar
Wim5150,

The connectors are known as 'turned pin SIL' from here: https://www.rapidonline.com/truconne...ocket-22-17517

You might also be interested in these articles:
http://peterboroughmfc.org/technical...maticplugs.htm
http://peterboroughmfc.org/technical.../conn_lite.pdf

I also use Micro JST 1.25mm quite a bit.


Charging small Lipo is something I am still working on:
https://www.rcgroups.com/forums/show...po-s-with-PCMs

My best solution so far is to use 1S 100mah, remove the PCM and then parallel charge a few at a time with my Imax B6. The Imax B6 has a minimum charge current of 0.1A but it's not very accurate with small cells and struggles to give them a full charge. Doing four 100mah batteries in parallel at 0.4A (ie 1C) gets me to about 4.1V. In theory you could do this with smaller than 100mah but I have yet to try.

I'm planning to build a small lipo charger as suggested in the above thread.


Jon
Last edited by slowmatch; Jan 10, 2018 at 08:52 AM.
Jan 10, 2018, 10:39 AM
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jumo004's Avatar
Quote:
Originally Posted by wim5150
thanks slowmatch. Can you tell me where you find the materials shown in the last picture ?
I've been trying to find small round pin and sockets, and a good charger for small LiPos.

Not sure, but these look to be the same connectors ....

https://www.micromark.com/32-pin-Micro-Connector-Set_2
Jan 10, 2018, 11:08 AM
Registered User
slowmatch's Avatar
Looks like it but you should find it cheaper somewhere...
It's on ebay too. Just make sure it's 'turned pin'.
Jan 10, 2018, 05:57 PM
Sopwith Camel's Cousin
Quote:
Originally Posted by funwithplanes
Post this on the freeflight forum as well! I have played a bit with capacitors but have not had much luck. if you ever decide to make plans you should post them on the scratchbuilt indoor and micro models section, i'm sure that some would convert it to rc as well.
And another place to post: Scratchbuilt Indoor and Micro Models forum:
https://www.rcgroups.com/scratchbuil...cro-models-85/
Jan 12, 2018, 02:30 AM
Registered User
PaulB's Avatar
Not had this long but so far has proved to give better results that my iCharger or Reaktor when charging small (>300 mAh) single cells.

https://www.banggood.com/EV-PEAK-E6-..._warehouse=USA

Paul
Jan 15, 2018, 12:40 PM
Registered User
Had not been able to check this thread for a few days, come back to find alot of good info!

Thanks, slowmatch and others!


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