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Old 03-27-2012, 01:51 PM   #1461
foamball
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Re: Blue Foamie


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OK, you electronic guru's, got a couple questons, this probably isn't the forum to ask em in but..................... I got to have answers....quick!
Have one of HK orange receivers, the micro one.. and bought two of HK's linear micro servos... Now, they say these are for a 1 cell operation, 3.6V, but, this lipo won't run my 5gr outrunner for no longer than 2 minutes and that aint enough to get the silly thing in the air...
Now, queston.... I've changed the battery connector to accept the 2c lipo, 350mAh and want to know, will this damage these micro servos, or will the withstand the higher voltage.... Seems to me I read on HK's site, somewhere, that the max voltage is 4.5V for em...
Anybody got any ideas??????
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Old 03-27-2012, 05:16 PM   #1462
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Re: Blue Foamie

Quote:
Originally Posted by foamball View Post
OK, you electronic guru's, got a couple questons, this probably isn't the forum to ask em in but..................... I got to have answers....quick!
Have one of HK orange receivers, the micro one.. and bought two of HK's linear micro servos... Now, they say these are for a 1 cell operation, 3.6V, but, this lipo won't run my 5gr outrunner for no longer than 2 minutes and that aint enough to get the silly thing in the air...
Now, queston.... I've changed the battery connector to accept the 2c lipo, 350mAh and want to know, will this damage these micro servos, or will the withstand the higher voltage.... Seems to me I read on HK's site, somewhere, that the max voltage is 4.5V for em...
Anybody got any ideas??????
Hi Art
I've been using HK5320 servos which are rated for 4.2 volts with a Turnigy Plush 6a which has a Bec giving out 5.0 volts without too much trouble but I never used the linears.
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Old 03-27-2012, 09:09 PM   #1463
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Re: Blue Foamie

Simply put a diode (something like a 1N4004) in line with the BEC output of your ESC. So if your ESC output is 5volts, the diode will take 0.7Volts out of the equation, feeding your receiver and servos with only 4.3Volts.

Those linear servos are not that great, hope you have a few spares . I agree with Gaston, the HK5320 are much better.
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Old 03-27-2012, 10:46 PM   #1464
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Re: Blue Foamie

Is it really that simple? The ESC is a 1s ESC, will it handle 7.4 volts? The diode will look after the servos but I think the smoke will get out of the ESC.
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Old 03-28-2012, 02:22 AM   #1465
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Re: Blue Foamie

Good eye Hugh. I would think big smoke from the esc with two cells.

I have never found a good brushless system for 1 cell operation. I keep looking.
I would suggest, forget the 2 cell operation and go geared brushed for single cell. You can then use the liner servos. I had to rewire mine for that orange RX.

Use the power system that Stevens Aeromodel suggests for their planes.

Motor and Gear Box: Ultra Micro P-51, UM T-28 by ParkZone (PKZ3624) --$15
http://www.horizonhobby.com/products...m-t-28-PKZ3624

Prop and Spinner 130 x 70 (2): UM 4-Site/Champ -- $5
http://www.horizonhobby.com/webapp/w...pe=productgrid

And a brushed esc from HK
http://www.hobbyking.com/hobbyking/s...ro_Motors.html -- $10

This should be a much lighter plane than if you went with 2s.

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Old 03-28-2012, 06:43 AM   #1466
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Re: Blue Foamie

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Good eye Hugh. I would think big smoke from the esc with two cells.

I have never found a good brushless system for 1 cell operation. I keep looking.
LOL, that's why I missed it and suggested the diode... I'm still looking for a good 1S brushless system as well (that doesn't cost $80). I looked at the picture of the ESC (trying to find what kind of BEC was on it) and presumed it was a 2S or more ESC! That thing looked big for a 1S ESC. Another ooooops moment!

Oh well, it's BBQ season after all!
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Old 03-28-2012, 07:01 AM   #1467
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Re: Blue Foamie

HSH, to answer your question regarding the ESC, nope, it didn't take the 7.4V... Yep, it did smoke so I quickly unplugged the lipo..... Didn't apprear to hurt the servos tho... So, re attached a new ESC, 10Amp one, and plugged in the lipo again, this time, no smoke, motor had a lot more power, then, the servo test...... All three appeared to work OK, no smoke....... yet...
I haven't a clue what make the ESC is, it's from Lazertoyz but it appears to work OK and give me the power to the motor I need..
The plane weighed 2.7oz with the HK ESC, 1 cell Lipo and 3 linear servo setup, Now it's up to 3.8oz with the 2C lipo, 350mAh...
I guess I answered myself... Was hoping someone could shed some light on the linear servos tho...
It's ready for an outdoor test flight, now all I got to do is to wait for a stretch of good weather again... rain, cold, windy is in the forecast for the next few days... And April is just around the corner... Huh, Toledo time????????????
Thanks guys for your answers... Will keep on plugging along..
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Old 03-28-2012, 07:25 AM   #1468
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Re: Blue Foamie

Ha, further to my last post on the ESC... It was HK's BR3A HK 3amp single cell ESC BRUSHED micro....
I should have remembered, I got it for the Parkzone motor/gear combo, but in my hast to get a decent motor on it, I used a BRUSHLESS outrunner....
Now I know why it "Smoked"..... Dumb me....
Brushed ESC for a 2C operation, Brushless motor....... No further comment....
But, as I said, it is now ready for a trial flight, outdoors... maybe indoor if I can get in our gym soon...
Again, thanks for the info fellas....
All I got to do now is to get the brain to work right, eh??
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Old 03-28-2012, 07:30 AM   #1469
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Re: Blue Foamie

Another note:
I'm working on something big, for indoor flying..... If it's a go, then I'll be asking you fellows to support us on this "Special".
Should have an answer next week... It's a HUGE place, new, and just what we need for indoor....
Hope I got your taste buds going!
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Old 03-29-2012, 02:30 AM   #1470
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Re: Blue Foamie

Quote:
Originally Posted by Real Gambler View Post
LOL, that's why I missed it and suggested the diode... I'm still looking for a good 1S brushless system as well (that doesn't cost $80). I looked at the picture of the ESC (trying to find what kind of BEC was on it) and presumed it was a 2S or more ESC! That thing looked big for a 1S ESC. Another ooooops moment!

Oh well, it's BBQ season after all!
LOL, I come from the brushed days and I think all brushless controllers look big.
If you find a half decent 1s brushless system let me know. I built a small Sbach out of 3mm EPP that would be similar to the UMX Extra. I looked and looked for a 1s brushless system but ended up using the motor, gearbox and prop from the UMX Extra. I tried the linear servos but found them too slow. They also jittered with the throttle. The orange 5230 servos worked excellent and I switched over to them. Also used the micro orange rx from HK along with the brushed esc I posted in the previous thread.
Very happy with the performance.

Art, I looked up those linear servos and they only say for 1 cell operation. They may work for awhile but I think you are taxing them with 2s.
The magic smoke will let you know in the end.

Chris
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