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Esprit Model . Thunder Power RC . Real Raptors

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Align T-REX 600N 700N > Voltage Regulator: Align 2 in 1 or Fromeco?
 
 
airmobile
Senior Heliman
Location: Santa Clarita, Calif.

Okay, I'm a bit confused by the posts in this thread. I admit I may be missing a common concern or problem everyone here is discussing, but I just don't get it.

If the servos, Gyro and Rx are all designed to work at 4.8vdc, a good 4.8vdc power source is all that's required. Right?

I've researched on Futaba's website and for those using the S9252 and S9254 servos, 4.8vdc is what you need.
The GY401 needs 4.0 - 6.0vdc, The GY611 needs 3.8 to 6.0Vdc

So why have any power aboard the nitro powered Heli, greater than what a 4.8v battery will give you, unless you are using electronic components that require a higher voltage?

Thanks!
06-21-2007 Over year old.
 
 
JAGNZ
Elite Veteran
Location: Auckland, New Zealand

The point is longer flight times before recharging. By having a high voltage pack, stepped down via a regulator, you can get dramatically longer run times than a standard NiCAD or NiMh pack will afford you. Plus lithiums are much lighter for the same capacity battery.

Also, running a regulated system ensures a consistent current to the servos, whereas with other systems the power falls off as the battery discharges meaning the servo performance suffers.

Jason Greenwood

Fury Extreme, 2X T600N's, Trex 500, DSX9 2.4
www.3dheli.co.nz
06-21-2007 Over year old.
HOMEPAGE  
 
 
z11355
rrMaster
Location: 10000 is enough time wasted.

nice idea but you're wrong.

the difference comes in the chemistries. On nickel chemistries, you
get about 65% of the batteries capacity before you should recharge.

W/ Lithium, it's more like 85% due to the way it discharges.


And, most of the electronics (ie. servos) are will work at > 4.8v
and that gives more speed/torque
06-21-2007 Over year old.
HOMEPAGE  
 
 
airmobile
Senior Heliman
Location: Santa Clarita, Calif.

I understand now.

The regulators being discussed, like the Fromeco, what is the max VDC input they can handle safely?

Thanks!
06-21-2007 Over year old.
 
 
JAGNZ
Elite Veteran
Location: Auckland, New Zealand

z11355 - thanks for clearing that up, I was always told it was due to capacity/voltage differences. Why then do all our Lithium Rx Packs output higher than 6v? If the chemistry is where the advantage is, then why not have the voltage output be the same as a fully charged NiCD and not have to run a reg at all?

Jason Greenwood

Fury Extreme, 2X T600N's, Trex 500, DSX9 2.4
www.3dheli.co.nz
06-21-2007 Over year old.
HOMEPAGE  
 
 
z11355
rrMaster
Location: 10000 is enough time wasted.

because the chemicals that make up the battery cell determine
what the battery terminal voltage will be.

the natural voltage for nickel cells is 1.2v

for lithium it's approx 3.6v

for lead it's 2v
06-21-2007 Over year old.
HOMEPAGE  
 
 
JAGNZ
Elite Veteran
Location: Auckland, New Zealand

Aha, that makes sense, thanks for the good info.

Jason Greenwood

Fury Extreme, 2X T600N's, Trex 500, DSX9 2.4
www.3dheli.co.nz
06-21-2007 Over year old.
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

A fully charged Li-Po battery has a voltage of 4.2V per cell. So a 2 cell battery has a voltage of 8.4 volts, and a 3 cell battery (Trex 450) has a voltage of 12.6 volts.

What is the voltage per cell for a fully charged Li-Ion battery??

I got a helicopter for my girlfriend,
It was a good trade!
06-21-2007 Over year old.
 
 
z11355
rrMaster
Location: 10000 is enough time wasted.

in the old days, LiIon was 0.1v lower but fabrication/chemical
improvements eliminated that difference but that is why you
see 'older' chargers that call LiIon cell voltage as 3.6 when
'today', they really 3.7v
06-21-2007 Over year old.
HOMEPAGE  
 
 
BlakeMcBrayer
Elite Veteran
Location: Georgetown, Ky

airmobile

Different servo are rated for different voltages. Some will operate up to 6 volts and others won't. It all depends on the servo. With servos that will handle 6 volts, they operate faster and stronger when ran a 6 volts rather than 4.8.

The Futaba 401, 501, 502, 601 & 611 (and some other brands) will all work at 6 volts. The problem is the servos used with them, they will not last very long when run above 5.1 volts, hence being rated for 4.8 volts ONLY.

.

Don't come off the throttle untill you see your GOD!
06-21-2007 Over year old.
 
 
airmobile
Senior Heliman
Location: Santa Clarita, Calif.

Thanks!

So the servos you'll install will be the 6vdc models, rather than the 4.8 models.

So with the Fromeco Arizona:
The Gyro gets a fixed 5.0vdc, but the adjustable circuit for the servos would be set at 6vdc.
But the Rx is on the same adjustable circuit. Will they handle 6vdc?
06-21-2007 Over year old.
 
 
Ace Dude
Elite Veteran
Location: USA

So are the legends not standing the test of time?

http://www.duralitebatteries.com/gallery.html



06-21-2007 Over year old.
 
 
Ticidytoc
Senior Heliman
Location: Los Angeles, Ca.

Quote 
I'd stick with LiIon myself. I don't trust LiPos for RX packs.

Why ?
06-21-2007 Over year old.
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Does anyone want to take a shot to the S9252 question?

Can I run these cyclic servos at 5.8 volts???

I got a helicopter for my girlfriend,
It was a good trade!
06-21-2007 Over year old.
 
 
Ticidytoc
Senior Heliman
Location: Los Angeles, Ca.

Yes you can run the 9252's at 6V.
06-21-2007 Over year old.
 
 
RonHill
Veteran
Location: ..

Rockohaulic

That question has been asked a bunch. A quick search will show you tons of discussion on that very subject.
06-21-2007 Over year old.
 
 
Edders
Senior Heliman
Location: Suffolk,UK

Fromeco for me. Ive got an align one that tested didnt like the weedy wires and the JST connector (which I changed to deans)

as for the battery I think the biggest thing is which heli its going into on my two 600's I use the larger fromeco pack. The electric 600 this balances the heli perfectly on the 600n though it does make it a touch nose heavy but nothing too bad (I want the most nuber of flights)

Edders

Sponsored by Real Raptors and CSM
06-21-2007 Over year old.
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Quote 
Yes you can run the 9252's at 6V.

I believe that is the accepted answer.

But why then can't you run a tail servo at 6 volts?

I got a helicopter for my girlfriend,
It was a good trade!
06-21-2007 Over year old.
 
 
Ticidytoc
Senior Heliman
Location: Los Angeles, Ca.

Who said you cant ? The 611 manual says 6.0v.

You will most likely burn up your tail servo faster running at a higher voltage and with a high gain on any tail, esp. the Trex tail. The "standard" gain of 36 does not apply to the new tail. My gain is down to 27 and it still holds just fine.

You need to remember that the tail disk is larger on the new tails so lower gain values will produce the same results.

Personally I do not see any reason to pump 6.0v into the tail servo, and at $150 a pop its fast enough as it is, so I use a diode on mine. Align sells these diodes for 3.99 or you can make your own.
06-21-2007 Over year old.
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

The reason you get longer run time with a 7.4V 2300 lipo than with a 4.8V 3000nicd,is because the lipo is rated at a 7.4volt discharge rate and since you are only discharging it at a 5.2 or 5.8 volts it has less amp draw and will last longer.We are using 9252 servo's at 5.8 volts with no problem.DOUG
06-21-2007 Over year old.
 
 
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Mikado Modellhubschrauber . GrandRC . CanoMod

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Align T-REX 600N 700N > Voltage Regulator: Align 2 in 1 or Fromeco?
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