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Gyro Hobbies . JR-Spektrum . E-flite

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Main Discussion > 8717
 
 
Jeff polisena
Veteran
Location: westpalmbeachflorida usa

MJWS,
I agree this is why I like RR you see many different people giving good info doing research I am the type of person that does not like to take someones word because as we know we all interpret things differently once I talked to distributor I just didn't want to waist money . I am happy with my lipo setup but now maybe I will try A123

I dont know how to fly just how to not crash !!!!!
05-10-2008 11:28 AM
 
 
Ace Dude
Elite Veteran
Location: USA

Yes, RR is a great resource, but lets not forget about all those folks posting mis-information as well which only makes matters worse. This includes those folks who believe a distributor, who has a vested interest in making a sale, and those who cannot interpret a discharge graph.



05-10-2008 01:39 PM
 
 
MJWS
Key Veteran
Location: Airdrie, AB - Canada

With 8717's 2s Lipo is better. You may as well get all the speed and power you can, imho. The significant advantage to A123's is that we can run an unregulated (KISS) rig on any 6V servo. Fast charging, and robust cells are nice to have, but Lipo still provides the best energy density.

Have fun,

Mie
05-10-2008 04:35 PM
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

That's what I like about the A123 setup, you get rid of the regs, and still are within voltage spec for a 6v servo. I wonder if you were told not to use them because they thought you were going to still use a regulator, and most regs would shut down with a 6.6v or so input from an A123. Also, I can't be the only person who isn't comfortable running the 8717s at a higher voltage than the specs call for.


Nick Crego
As I wind on down the road...
05-10-2008 04:48 PM
 
 
Ace Dude
Elite Veteran
Location: USA

I'll take the safety, fast charge rates, durability, cycle life, and cold weather performance of A123 cells over LiPo any day.



05-10-2008 04:51 PM
 
 
3Dx
rrAdvertiser
Location: Monterrey NL Mexico!

Here my Vibe with Spektrum Dual Output Regulator.

05-10-2008 06:46 PM
 
 
Jeff polisena
Veteran
Location: westpalmbeachflorida usa

I run straight from batt so fully charged 8.4 v maybe this is reason I was told not to use A123 I dont know

I dont know how to fly just how to not crash !!!!!
05-10-2008 11:15 PM
 
 
Ace Dude
Elite Veteran
Location: USA

Quote 
I run straight from batt so fully charged 8.4 v maybe this is reason I was told not to use A123 I dont know

So are you now saying you don't actually follow the official manufacturer provided specifications? The official voltage max voltage rating on the 8717 servos is 6v. You can argue that the 6v really means a 5 cells NiXx pack, but a 2S LiXx still a bit more than that.



05-11-2008 12:38 AM
 
 
Jeff polisena
Veteran
Location: westpalmbeachflorida usa

I was only stating what a battery manufacturer said to me. Not to get in too deep , I run 8717's as well as everyone else and I have had no issues and JR rep also told me that you can run more than 6v but will not warranty

I dont know how to fly just how to not crash !!!!!
05-11-2008 12:50 AM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Quote 
So are you now saying you don't actually follow the official manufacturer provided specifications? The official voltage max voltage rating on the 8717 servos is 6v. You can argue that the 6v really means a 5 cells NiXx pack, but a 2S LiXx still a bit more than that.
Where does it state that 6 volts is the maximunm.They only give you the specs for 4.8 and 6.0 volts,nowhere does it say thats the maximinm voltage you can use. I have yet to hear of one failing.
05-11-2008 01:40 AM
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

Where does it say not to run them on 24v? Your question is ridiculous, the manufacturer specs them for 6v, if they wanted them run on 2s lipos it'd say so in the specs.


Nick Crego
As I wind on down the road...
05-11-2008 01:53 AM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

It's not a question,it's a fact show me where it says 6 volts is the maximimun you can run and i'll shut up.It's only a spec at 6 volts.
05-11-2008 01:56 AM
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

Once again, would you run it at 24v? Where does it say you can't? I bet they'd rock on a straight 6s lipo.

http://runryder.com/helicopter/t408416p1/

Go to that thread, BJames, a Heliproz employee, posts about a call with a Horizon tech support rep, and is told that they do not support a straight 2s lipo. You don't have to believe him (and the specs that JR prints everywhere), call Horizon yourself. Needing them to specifically say "Do not run more than 6v" when they clearly state the specs is silly. They are probably fine on 2s Lipos, but JR says not to do it, and they probably won't last as long because of it.


Nick Crego
As I wind on down the road...
05-11-2008 03:02 AM
 
 
Ace Dude
Elite Veteran
Location: USA

Quote 
It's not a question,it's a fact show me where it says 6 volts is the maximimun you can run and i'll shut up.It's only a spec at 6 volts.

In addition to 24v, why not try AC and let us know how they work as well....



05-11-2008 04:27 AM
 
 
Jeff polisena
Veteran
Location: westpalmbeachflorida usa

You guy's are the reason why RR has its rep now you are wanting to debate who is rite or wrong this is simply to get info out on Helis bottom line is who cares what anyone says just figure it out for your self, just because you can use BIG words doesnt mean you know SQUAT look at our government

I dont know how to fly just how to not crash !!!!!
05-11-2008 12:37 PM
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

BS. You are the one attacking someone else. It's not a debate who's right or wrong, the question was asked where it says to only run them on 6v, that question was answered.


Nick Crego
As I wind on down the road...
05-11-2008 01:35 PM
 
 
gullie667
Veteran
Location: Raleigh, NC

Here ya go...

http://www.horizonhobby.com/Product...rodID=SPMAR7100

This is what I have been using for about 6 months and it rocks.
I run a 2s lipo straight.

Built in step voltage regulator for the gyro, built in governor, tidy package. You can't beat it.

Gullie

Helicopters - 1000 parts flying in formation.
05-11-2008 02:46 PM
 
 
Ace Dude
Elite Veteran
Location: USA

Quote 
You guy's are the reason why RR has its rep now you are wanting to debate who is rite or wrong

So you're saying we shouldn't question recommendations outside of the manufacturers specifications?

Should we follow your advise and throw away our A123 packs just because you said not to use them?



05-11-2008 02:54 PM
 
 
Eco8gator
Key Veteran
Location: Palm Beach Gardens, FL

Its funny but I know for a fact there are Team JR USA/Horizon/Specktrum(one of those all the same in my book) pilots running 8V setups on their planes and helis. And Im very curious why do many of the components made imply the use of 8v setup like the step down and the big jet Rx system.

I know what the box says but why do their pilots run 8V setup and design 8v systems, and allow vendors to adv. things like "crack pack" with various combos?

The box says one thing but other products imply another. Im not saying to do it but all I know is I made my decision to run 8V when I saw their own team pilots doing the same thing and the results are amazing IMHO. If figure the people who test this stuff are the ones that know their true capabilities.

My setup is fueled by observation from their own reps and personal testing. Question the box all you want BUT next time your at funfly find the group of guys that are in red or specktrum grey and dont ask but look. Im sure youll find interesting stuff

C
05-11-2008 04:47 PM
 
 
Eury
Elite Veteran
Location: Ankeny, IA, USA.

No doubt, plenty of people are doing it, including those on the team. I've got a couple of AR9100 receivers for my giant scale planes, and the manuals are hilarious. The wiring diagrams all show that you should be plugging the lipos directly into the receiver and running the servos at 8v, and right underneath those diagrams and descriptions, they say that the servos are not designed to run at 8v, and not to do it. It'd be nice if they just said it was OK.


Nick Crego
As I wind on down the road...
05-11-2008 04:56 PM
 
 
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