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T-REX 700 › rx pack for 700e
01-02-2011 11:55 AM  7 years agoPost 1
2low

rrApprentice

elkview,WV

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I ordered a NRG 2s 5000 7.4 for the rx pack. I hate a tail heavy heli will this pack make the cg spot on? Thanks.

Got to have my cup of heli in the morning.

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01-02-2011 03:20 PM  7 years agoPost 2
tj1

rrApprentice

ireland

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i have one in my 700 needed the 5000mah for the flybarless system draining my battery ,,, flys good and forever ,,, about 6 flights before charge ,,,,,,

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01-02-2011 05:59 PM  7 years agoPost 3
litespeed600

rrKey Veteran

St. Charles, Missouri

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I have a 1900mah Align on the 6 amp BEC and I get 5-7 min flights out of mine flying mild 3D. You guys must really be throwing those helicopters around hard. I was going for low weight.

Tom

Married with 2 kids, I am no stranger to pain!

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01-02-2011 06:29 PM  7 years agoPost 4
TrevJonez

rrKey Veteran

St.George, Utah - USA

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i use a LiFe 2s 2100 mah and can do 6 or so 5 minute flights without worrying about the battery.

running ds610 and ds650 with the 3g. ar7100 RX everything working great so far.

Who cares... its just money...

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01-02-2011 06:36 PM  7 years agoPost 5
rstacy

rrElite Veteran

Rochester, NY

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I hate a tail heavy heli will this pack make the cg spot on?
The best way to make your helicopter balance spot on is to invest in one of the few devices that lets you slide the battery pack forward so that the front battery is about flush with the front of the radio tray.

Its fine if you want to run a separate receiver battery to deal with other issues but I would rather solve balance issues by redistributing the existing weight if at all possible.

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01-02-2011 07:44 PM  7 years agoPost 6
HarveyR

rrVeteran

France - North

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+1 on that. THERE'S NO BALANCING ISSUE WITH THE 700E WITHOUT RX PACK.

It balances just fine (or even front heavy if pushed to far) with the LiPo pushed forward and it's no risk. I'd even say it reduces the risk as I have a strap around the front LiPo and RX tray (stopping the whole tray sliding front or back amongst other advantages, much less hassle than the "default" Align setup, but does require taking the canopy off to swap LiPos).

Therefore I use a Hercules BEC (and no RX pack), so I get unlimited flights and high power and don't need to worry about RX packs being charged or not.

I've said this a few times, but I see no valid reason at all to use a RX pack on the 700E. As said, balancing is fine. People mention security, but, how can a higher component count reduce failure risks... that beats me.

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01-02-2011 08:04 PM  7 years agoPost 7
rstacy

rrElite Veteran

Rochester, NY

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I've said this a few times, but I see no valid reason at all to use a RX pack on the 700E. As said, balancing is fine. People mention security, but, how can a higher component count reduce failure risks... that beats me.
Harvey,
I completely agree with you except for one issue. When that silly Deans plug unplugs then you lose your radio control.
We lost a heli this weekend because of that. Pretty much my fault because I inadvertently used an aftermarket Deans clone.
I'm about to cure the problem by switching to bullet connectors.

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01-02-2011 08:19 PM  7 years agoPost 8
tj1

rrApprentice

ireland

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sorry forgot were i was in runryder ,,, i dont even have a 700e
mines the 700n ,,,a well

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01-02-2011 10:01 PM  7 years agoPost 9
HarveyR

rrVeteran

France - North

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rstacy, I get your point (which is the "security" argument that often kicks in at this point), but still, I don't see why the Power Pack Deans plug (or whatever plug) is more likely to fail than the RX Pack Deans plug.

Worse, as in fact you (I say "you" talking generally about people with 7.4V RX Packs, don't even know if you do or not) have two plugs, you have twice as many chances for one to fail (hence my trying to lower component count to increase security).

There's as many chances your RX Pack plug fails as my Power Pack plug fails. And in addition you still have the same chances as me that the Power Pack plug fails. So twice as many chances, even if for the second half in some cases you might save stuff with an auto, so let's say you have twice the chances I have of failure and 1.5 times the chances of severe damage after failure.

I'd understand the security argument if people used an onboard Dual RX Power Fail Safe system (or whatever it would be called), in which case the RX power supply would be doubled, one from the 7.4V and one from the 48V, then the Power Fail Safe thing would switch between them if one fails.... but I don't think people with 7.4V setups use such a device, do they?

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