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Old Jul 20, 2011, 09:02 AM
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Northwest Indiana
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Originally Posted by mschulz View Post
Tom,
Put a regulator or a BEC on the circuit; I've got one on my Su-26 and have never had a problem with it. VVRC and many other reputable gas engine suppliers recommend this configuration. Unless you want to buy different servos that behave better when voltage > 6, but a regulator will cost less than a new set of servos.
-Mike
Mike that is a good point
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Old Jul 20, 2011, 09:02 AM
A trail of smoke is GOOD!
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USA, TX, Springtown
Joined May 2008
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Originally Posted by CRFan1 View Post
But A key diff between the two is the A123 will deliver more amperage when asked too
Kinda like having a 30A power supply and using it on a 5A charger.

Whatever you like that works.

What receiver are you using?

I would call and find out why those expensive, coreless servos won't take that voltage.

BTW - If you put a reg/BEC (same thing) on set to 6V on the Life pack, it can only regulate as long as the input voltage is greater than 6V.

I considered a regulator on my Corsair for the retract servo. I decided to just put a diode in the power lead of the extension going to it.

Hitec Customer Service and Product Questions
Ph: (858) 748-8440
Fax: (858) 859-2618
E-mail: service@hitecrcd.com
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Old Jul 20, 2011, 10:42 AM
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USA, NH, Alstead
Joined Oct 2007
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Quote:
hey guys I think I have narrowed the cause of my crash down to a lipo failure.
I suspected that might be the case because 7 minutes of agressive flying can drain a battery:

Quote:
I assume perhaps some other type of glitch happened to Nate as he was running Lipos . It was pretty aggressive flying for 7 min; I wonder if the LVC kicked in momentarily and that locked out the RX?
I hope it wasn't one of those that you brought back to life. But in any case, it really was just running out of juice, which is one of the things that always bothers me with electrics because you just don't really know exactly when it is going to happen and there is not a lot of room for error. Setting a soft cut off as mentioned might help, of course.
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Old Jul 20, 2011, 10:51 AM
A trail of smoke is GOOD!
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USA, TX, Springtown
Joined May 2008
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Some of the default LVC settings on ESCs can be kinda low. I just set the one on my FunCub to the high setting with soft cut-off. Protects the batteries a little and gives me a bigger margin.
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Old Jul 20, 2011, 11:07 AM
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Northwest Indiana
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Quote:
Originally Posted by waynemia View Post
Kinda like having a 30A power supply and using it on a 5A charger.

Whatever you like that works.

What receiver are you using?

I would call and find out why those expensive, coreless servos won't take that voltage.

BTW - If you put a reg/BEC (same thing) on set to 6V on the Life pack, it can only regulate as long as the input voltage is greater than 6V.

I considered a regulator on my Corsair for the retract servo. I decided to just put a diode in the power lead of the extension going to it.

Hitec Customer Service and Product Questions
Ph: (858) 748-8440
Fax: (858) 859-2618
E-mail: service@hitecrcd.com
Thanks wayne....I called Hitec and they had no explanation other than to say that long extensions can cause that. I say BS, cause I plugged them straight in. I actually found a you tube video of a guy complaining of the same thing. I will set the reg to 5.5 volts probably. These servos put out probably more torque than this plane will ever use....
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Old Jul 20, 2011, 11:30 AM
A trail of smoke is GOOD!
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USA, TX, Springtown
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Originally Posted by CRFan1 View Post
Thanks wayne....I called Hitec and they had no explanation other than to say that long extensions can cause that. I say BS, cause I plugged them straight in. I actually found a you tube video of a guy complaining of the same thing. I will set the reg to 5.5 volts probably. These servos put out probably more torque than this plane will ever use....
Did you try another receiver? I have seen some odd things.
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Old Jul 20, 2011, 11:31 AM
A trail of smoke is GOOD!
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USA, TX, Springtown
Joined May 2008
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If you use 2200mAh lipos, here is a buddy code to get Nano-tech 2200mAh, 3S1P, 25 - 50C packs for $10.27 plus shipping, normally $17.75.

http://www.hobbyking.com/buddy.asp?c...C-1E4CD66AAF23
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Old Jul 20, 2011, 11:42 AM
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Originally Posted by waynemia View Post
Did you try another receiver? I have seen some odd things.

Not yet but I am going to.....
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Old Jul 20, 2011, 01:09 PM
3d NOOBular
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USA, UT, St George
Joined Aug 2010
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Quote:
Originally Posted by u2builder View Post
I suspected that might be the case because 7 minutes of agressive flying can drain a battery:



I hope it wasn't one of those that you brought back to life. But in any case, it really was just running out of juice, which is one of the things that always bothers me with electrics because you just don't really know exactly when it is going to happen and there is not a lot of room for error. Setting a soft cut off as mentioned might help, of course.
7 minutes of aggressive flying is too much for these packs but if you pay close attention to the vid you will notice it was just over 6 minutes which is routine. I think the heat played a factor here. I was starting my landing approach when it cut out.
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Old Jul 20, 2011, 02:42 PM
BANG IT!!!
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United States, PA, Bellefonte
Joined Dec 2007
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Quote:
Originally Posted by brathanke View Post
7 minutes of aggressive flying is too much for these packs but if you pay close attention to the vid you will notice it was just over 6 minutes which is routine. I think the heat played a factor here. I was starting my landing approach when it cut out.
I can understand the motor loosing power and such but the Spektrum wont brown out until 4. something volts. For a lipo to go low enough to brown out that is scary. Heat could have caused a thermal lockout of the Air Boss maybe?

LVC soft set up and maybe one of the Lipo Warning beepers until you sort things out. I hope you can find the smoking gun, watt meter it and make sure everything is below limits, step back on the prop a little if needed.
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Old Jul 20, 2011, 02:45 PM
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Northwest Indiana
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Well, did some further troubleshooting at the LHS with my whole set up and brought a wing with the HS985....

Bottom line is the servo issue never went away. A regulator made it better but it was still there. Tried a new one in the box (probably from the same batch as mine...did it too. Even tried a different battery and an AR 800RX! We took a vid and sent it to hitec. Bottom line is I am exchanging them. Going with some HS5645 digitals...A bit cheaper but almost equal torque rating and very smooth. I tried several on my set up in the store and ZERO issues. Go figure. I am guessing a bad batch of servos. So, the build is on hold more or less until I get the 985's out and exchange them on Saturday.
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Old Jul 20, 2011, 04:15 PM
A trail of smoke is GOOD!
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USA, TX, Springtown
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at least you know now.
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Old Jul 20, 2011, 06:42 PM
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United States, OR, Klamath Falls
Joined Aug 2005
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Quote:
Originally Posted by waynemia View Post
If you use 2200mAh lipos, here is a buddy code to get Nano-tech 2200mAh, 3S1P, 25 - 50C packs for $10.27 plus shipping, normally $17.75.

http://www.hobbyking.com/buddy.asp?c...C-1E4CD66AAF23
Capacity(mAh) 2200
Config(s) 3
Discharge(c) 25
Weight(g) 187
Max Charge Rate (C) 5
Length-A(mm) 106
Height-B(mm) 35
Width-C(mm) 24

am I reading this correctly a 5C charge rate
"11 Amp charge"

Wayne are you using these... mixed reviews...
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Old Jul 20, 2011, 07:55 PM
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winston mo
Joined Oct 2006
7,497 Posts
Once again myself being old school. I like to use an expaned voltmeter an be able to read my battery's voltage. With the Nimh I can check it anytime I want and not half to guess like you do with all the other type of batt's.
I'm running a hydramax 5cell 2000 mah on. my RX an servo's and I'm running a 4 cell hydramax 2000 mah And I can get several flight out of it with the Green Machine.
Now the Green Machine has been calling my name all day but it was just one of those busy days.
O Why can't I be rich an Retired, I buy one of those condo's in the AMA magzine that has it's own flying field.
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Old Jul 20, 2011, 08:15 PM
3d NOOBular
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USA, UT, St George
Joined Aug 2010
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Quote:
Originally Posted by waynemia View Post
If you use 2200mAh lipos, here is a buddy code to get Nano-tech 2200mAh, 3S1P, 25 - 50C packs for $10.27 plus shipping, normally $17.75.

http://www.hobbyking.com/buddy.asp?c...C-1E4CD66AAF23
When I click the link it just takes me to the listing and the price is still 17.75. Am I missing something?

Edit: you have to be logged in to see the 10.27 price. Thanks Wayne I just ordered 3 of them
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Last edited by 3DNater; Jul 20, 2011 at 08:24 PM.
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