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Sep 27, 2018, 05:47 PM
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Mini-Review

Flysky FS2A 4 channel mini receiver from BG






My next receiver test is this 4 channel flysky AFHDS 2A ( apparently now called FS2A ) . A word of warning , these receivers need to have the pins soldered in place by the purchaser . If you look at the pictures you will see that 3 of my solder joints were questionable . Good thing about Macro Photography , great way to check really small work . Anyhow , I went back and corrected the 3 questionable solder jobs .
Once again this is more a test to see how useful this receiver might be for DLG use , as I would be very interested in running a 1s battery without a voltage booster . Some time in the future I will have to so some servo tests , to see how much current they pull . Might be nice to have lower current servos in a DLG running a 1s solution less voltage boost . ( But that's down the track )
 
 Variable Power Supply : 
 Putting the small FS2A receiver on the power supply with 2x9g servos attached , I first tried 5v @ 0.5A - There was no browning out .
 Next I tried 4v , but I increased the available amps to 1 ( 1A ) . 4v @ 1A - There was no browning out .
 From here I went to 3.5v @ 1A - There was no browning out .
 Then I went to 3.2v @ 1A - There was no browning out .
 To push my luck I dropped the voltage to 3v @ 1A - There was no browning out .
 Ooooh come on , brownout already ! So I lowered the available current to 0.5A , 3v @ 0.5A , yes the Rx is browning out .
 At 3.2v the 9g servos are really feeling the low voltage , becoming sluggish . ( Perhaps a good warning for low voltage ? )
 
 1s Battery :
 I was going to recharge that 1s battery I have been using , but now me thinks not . Last time I checked it was 3.85v and I think that might be enough . This receiver look to be very 1s capable and all we need to check on is how low can it go !  
 I plugged in the 1s and then added some 201.8 grams of weight to the end of the servo arm to do some weight lifting ( add some load ) . The results were some what energetic and there was no sign of brownouts . Next I am discharging the battery closer to a state of discharge ( empty ) to see how the Rx performs .
 At some 3.67v I try again to see if the receiver browns out , and no !
 Discharged further to some 3.51v ( battery is close to depleted ) and ran the same scenario and no browning out ..
 Even with the 1s @ 3.51v the servo doing the lifting had some energy and gusto ..
 
Range Test :
 Using that 1s battery @ 3.51v I went outside to range test the Rx . Transmitter was the Jumper T8SG Plus and set to range test mode 100uW .. At some 50 meters I still had no brownouts , not even when I tried to block the signal with my body .
 I have to say , I am learning something ...
 
Conclusion :
 Darn it to all heck ! , just have to buy another one of these FS2A Rx.. 5 minutes later ( Ok just bought another ! )
A) small mini size Rx
B) Looks to run 1s really well
C) yes you need to solder in the pins , but why ? Why not de-plug your servos and solder them directly ? And the same goes for the battery , since the Rx will run 1s why not just solder in a battery plug ? ( Fun and games )
D) CHEAP !
E) I really think this Rx might work well in a DLG ( 1 meter or smaller )
F) Range tested well .

So I am impressed again , yes I had to buy another ( There was no choice - get em while you can ) .. So this is it for now as far as receivers go , I think I have enough for my glider plans . I have a few 9g servos in my collection , so I may test 'em for current draw - Lower might be better in this case . Also have some cheap small servos on order - be interesting to see how they go . My gliders ( Foam FF ) are not here yet . ( I might want to try wingerons )
Stuff is slowly getting here , hmmm carbon !
Have fun everyone ... ( I'm trying to )
Last edited by old4570; Sep 27, 2018 at 06:03 PM.
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Jun 11, 2019, 02:45 AM
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Does this have internal voltage telemetry like FS-ia6 / FS-ia6B receiver? since it using AFHDS 2A protocol
Jun 11, 2019, 05:53 AM
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No - no telemetry ...
Sep 11, 2019, 05:12 AM
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Hi there,

After reading your article, i bought myself 1 pc to test it out.

Have u tested the wingerons?

Rgds
Sep 11, 2019, 09:06 AM
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Quote:
Originally Posted by Lal Beikh
Hi there,

After reading your article, i bought myself 1 pc to test it out.

Have u tested the wingerons?

Rgds
Yes , the model I tested was too small ..
The physical function worked fine , but due to the small size of the glider , the reality was unsatisfactory .
I think gliders around 600mm + would be better .

I have tested 350mm and 480mm and the results are disappointing .
Sep 20, 2019, 12:29 AM
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Hey Mike,

Thx for replying, just got my receiver today, cant wait to test it out.

Saw this video on wingerons, plan to try to do one with this receiver. What was ur setup? Perhaps the link can give u some idea.

Multiplex Fox glider power conversion wingeron & a P-51 crash in the background (4 min 5 sec)


Rgds
Sep 20, 2019, 01:20 AM
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Y - thats it . except mine were pure glider ..
I have only one small conversion left that works , and that is a rudder / elevator 480mm ..
And it's as sketchy as all heck to fly .
Sep 29, 2019, 06:26 PM
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Hello.

Hey I want to put this RX in an Eflite UMX with linear servos.

Do you think the servos will be ok on 2s 7.4 volts ???
Or am I missing something?

I like the compactness of the RX very much!

Thanks!!!!

LFK
Sep 29, 2019, 07:11 PM
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What is your set up ?

The ESC - UBEC should reduce voltage to 5v to the Rx (?)
THe linear servos can handle ? voltage
The ones I have , are 3.3 volt to 6 volt .
Sep 30, 2019, 11:36 PM
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Quote:
Originally Posted by old4570
What is your set up ?

The ESC - UBEC should reduce voltage to 5v to the Rx (?)
THe linear servos can handle ? voltage
The ones I have , are 3.3 volt to 6 volt .
Hey there.

Will be using the smallest 3phase ESC, FS2A RX and I hope to use the servos on the Eflite UMX pits.
To ditch the gyro. and a fidgety servo issue.

I am not sure what ESC yet.
I guess the magic is the UBEC is in the ESC and which will be the voltage regulator.

could be a fools errand! : -)

But I guess I can test the voltage to the servos before hooking them up.
Actually I can test the voltage on the original board in the plane too.

Ha! ok I think I get this now.

Wish me luck.

My FS2A RX is in the post on it's way down to Hamilton from Auckland. !!!!
Should be here tomorrow. Fingers crossed.

LFK.
Oct 01, 2019, 01:49 AM
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https://www.horizonhobby.com/umx-tra...ology-eflu5250

This one ?
If so , I would expect that there is 5v going to the servos as that plane uses a 2s battery .
Oct 01, 2019, 02:08 AM
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Yes. That is the little guy that is currently in parts
sitting on my bench.

I have had it powered up on 2s and it bound to TX .
But after two crashes with one of my other planes with the Dx4
really am a bit shy about flying it with DX4 now.
Also it makes a whinning noise on the elevator servo.... not nice!

So a really small 2s ESC with UBEC is the way forward I gather.
Then the mini RX and some good old fashioned tinkering.
Soldering on the servos....

Also finding a cheap 20gram or less 2s battery is proving tricky.
The local shops want about $30 for one. Heck!
may see if i can harvest the broken micro RC toys for batteries.

Well it goes any way. I guess it's not a lost cause just yet.

and by heck that tiny little motor really pulls on 2s. Quite a champ!

Thanks!

Aleks.
Oct 01, 2019, 08:16 AM
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Hobbyking !

Has a 300mAh 2s that might work .
Also from time to time , there might be a 180mAh 2s available
Oct 01, 2019, 03:50 PM
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Quote:
Originally Posted by old4570
Hobbyking !
Actually I have never bought anything through HK mostly due to living in New Zealand.

I think I found a shop that does 2s 300mAh for $12 !!!! and I can bicyle there. Woo!

Will probably make a new plane for the FS2A RX when it finally arrives.
I found a cruddy DC motor and ESC/UBEC and two pair of folding props in my parts box!
Maybe I can swap out the DC motor and use a tiny one off a broken heli I have raided for
parts to make a FS2rAnken flyer? For kicks.

I think I need to have a mini system sorted out for making small planes.
Motor, ESC, RX ( FS2A), 2S battery and then servos.
I like the 500mm or so wing span size. : - )
and those chuck gliders are mighty cheap and look tough!

Woo it's still raining on and off.... hecking darn.

LFK.
Oct 02, 2019, 03:59 AM
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Mine has arrived!

It's sooooooo small! wow!

: - )


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