Brown out solution

[Flybar-less]

http://file.espritmodel.com/battery/bec/spektrum_voltage_reg1n.jpg (javascript: obrazek('http://file.espritmodel.com/battery/bec/spektrum_voltage_reg1.jpg',450,450))

[Mercuriell]

Nah - rotor blades too small - they need at least 325s on that cooling fan !

[th3tick]

That's a mighty hunk of metal!

It makes me wonder if you could plug this into one side of the AR9100, then a BEC into the other. That seems it would provide a nearly guaranteed, if weighty, solution.

John

[cptsnoopy]

I think it is time we start using separate power sources for the rx and servos. So if a servo starts going South, we will still avoid the brown outs. Now, I wonder when I will ever do this myself??? :D

[bladebraker]

Brown out solution?? Whats that?

[OICU812]

Well I have all my Vstabi machines now on 2S lipo 1345mah FP packs weigh in less than 60 grams plus the Spektrum Dual Voltage regulator and for me that is the way to go with my bigger machines "fow now" No switches and one plug in which is a micro deans between lipo directly to receiver so that is 8.4 volts to my Cyclics and only 5.2 to my tail servo as well as signal to my esc lead is reduced to 5.2 volts as well. When WR comes out with the new larger amped BECs I will look again at those.

[OICU812]

http://www.readyheli.com/SPMVR5203_Spektrum_Dual_Output_Regulator_p/spmvr5203.htm


These are what I am using at the moment, they work fantastic!

[Taipan]

Hey Shawn, you said the signal to ESC is reduced to 5.2V? Does that mean all the signal wires from any Rx operate at whatever voltage its power input is? I assumed signals operated at very low voltages as seeing it's only for data, not power.

Your setup sounds sweet as. Does it make your heli respond quicker than say using 9451's on 6V which is what I'm using? This might sound like a silly question, does 8.4V make it respond TOO fast? Cos the last thing I want is for my heli to be too twitchy! I'm more into super smooth precision 3D than bashing away on the sticks.

My mate has 8915's (same as 8717's) & he loves to crack his heli, will tell him if he wants to try 8.4V! Love Readyheli's 'crack pack' - 3x 8717's + Spektrum dual step-down.

[OICU812]

Taipan, hey man...

Vstabi loves fast servos, the faster the better. My 8717 on 8.4 volts are around .05 and over 165 oz of tourqe. You should reduce your voltage to signal wire on esc as anything over 7.7 volts seems to do funny things to escs, a few here on the Mikado board have found this as well. The regulator simply brings down the supplied voltage to 5.2 volts, escentially it is a mini BEC. However due not it is only good for 3amp peaks so basically your tail servo and gyro tag line or as mentioned esc lead. Several new gyros such as the Spartan series and Solid G are capable of handling up to 9.0 volts, but as wel know several tail rotor servos are not.

Anyd yes your bussy woiuld like 8.4 from 6 volts, it is a BIG difference, seriously I could not believe it myself. The servos as you list are 100% designed to handle and operate safely at 8.4 volts. Depending on what you run for other equipment will decide if you need one or two of these devices.

[Taipan]

However due not it is only good for 3amp peaks so basically your tail servo and gyro tag line or as mentioned esc lead

Shawn, I think your head is getting too cold from the snow cos you lost me :D Did you say 3amp is not enough for tail servo, gyro gain and ESC lines?

Hmm, my mate uses a JR 770 gyro which is only rated to 6V so will need 2 Spektrum regs for tail servo, gyro gain and ESC.

[Flybar-less]

The PJ won't handle more then abouit 7.7V. The Jazz, CC, and Shulze are fine on 8.4V. I'm going to use the Spektrum regulator on the Solid G with 2S.

[OICU812]

Shawn, I think your head is getting too cold from the snow cos you lost me :D Did you say 3amp is not enough for tail servo, gyro gain and ESC lines?

Hmm, my mate uses a JR 770 gyro which is only rated to 6V so will need 2 Spektrum regs for tail servo, gyro gain and ESC.


I was saying basically to not use more than that through it is all...

[MrRoth]

The SPMVR5203 Spektrum Dual Output Regulator is rated to 2 Amps (3 Amps Peak).
Is that enough for 3 8717s and a tail servo?

[Taipan]

No, you connect your 2S lipo directly to your receiver which powers the 3x 8717's up to 8.4V. You plug the Spektrum regulator inbetween the receiver and gyro/tail servo so they're at 5.2V.

[MrRoth]

Ahh...ok. Thanks for the info!!!

[th3tick]

And, as OICU812 said elsewhere, you might need the other slots in the SPMVR5203 for the throttle line back to your ESC if it can't handle the 8.4V.

[MrRoth]

Can Kontronic 55-10-32 handle 8.4Volt?

[Flybar-less]

yes

[CatchmyCorsair]

Did you guys see the new (?) Kontronik Jive ESC's?

http://www.heli-chris.de/index.php?cPath=96_6_221_225

[Flybar-less]

Available in April.
http://www.kontronik.com/Katalog08.pdf

[th3tick]

Yeah, already drooling for them. The price, however, is a it off-putting at $486 (converted) for the 80+ HV. It looks pretty cool, however...

[CatchmyCorsair]

Yeah, already drooling for them. The price, however, is a it off-putting at $486 (converted) for the 80+ HV. It looks pretty cool, however...

Yeah, you know it's bad when your ESC alone costs more than the heli it's flying in. :roll: :arggg: