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Old 06-11-2019, 11:54 AM
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Herve, if I install LiPos will it make me fly like Spencer and Gabe?
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Old 06-11-2019, 11:59 AM
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No
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Old 06-11-2019, 12:32 PM
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Originally Posted by dshriver View Post
Herve, if I install LiPos will it make me fly like Spencer and Gabe?
I fly the same radio Shulman, AJ, Chip, and Hempel use, and I still fly like me
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Old 06-11-2019, 02:08 PM
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I fly the same radio Shulman, AJ, Chip, and Hempel use, and I still fly like me
That's funny right there!!!
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Old 06-11-2019, 02:12 PM
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I still suck at golf no matter who's clubs I use.
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Old 06-11-2019, 02:18 PM
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You know, I never thought of it like that. Maybe I can cut back from the two four cell packs and only use two two cell packs. I don't do extreme and my average flight only uses about 300-400 combined mah so I know there is no high amp draw going on.
Noooooooo. In a 40 percentage the four cell packs are required so you don’t exceed the amp draw. Using two 4 cell packs is really 8 2 cell packs in parallel with lion. Lion cells are generally only rated at 5 to 6 amps per cell. 8 two cell packs will safely deliver 40 amps. 4 two cell packs 20 amps. 20 amps in 40 percent er is easy to hit. When lion are over amped they drop to. 0 volts for a second Which then equals crash.
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Old 06-11-2019, 08:03 PM
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Originally Posted by Islandflyer View Post
I personally use (and we distribute) Fromeco Relions LiIon batteries: they are safer and more convenient to use than Lipos:
- I slow charge them at the end of the day, and they do not need to be taken out of the plane, or vigilantly attended during charge.
- They do not discharge even after several months of not flying, so I can keep all our planes ready to fly at all time.


While it is true that the discharge rate is not as high as Lipos, if the mechanical set up of the plane is done with the proper mechanical advantage, only few pilots who fly hard 3D will notice the difference. I personally never felt any blow back with LiIons. Our top pilots like Gabriel Altuz, Spencer Nordquist have felt occasional blow back during rifle rolls, knife edge loops, or multiple high stress tumbles.


So when they fly our demo planes, we use Lipos rated at 25C or higher. The rest of us are very happy flying with Fromeco LiIon, and most of the time the Lipos remain stored away.

I am putting together a 35% plane, trying to decide on batterys and right now i am about decided on 2) of the Fromeco Relions 2600mah. along with a Wolverwine switch and ibec for ignition.. but not sure those are high enough mah or not.

looks like the plane will be running 5 MKS7777A+ servos and a jr throttle.

with those batterys the system can handle the 7.4 volts w/o need for any regulators or anything correct?


Sorry OP, not trying take over just thought since on the subject of it. i would ask.


what amps can the Fromeco Relions take? they can be charged pretty quick like a A123 right?
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Old 06-11-2019, 08:27 PM
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Originally Posted by epoweredrc View Post
I am putting together a 35% plane, trying to decide on batterys and right now i am about decided on 2) of the Fromeco Relions 2600mah. along with a Wolverwine switch and ibec for ignition.. but not sure those are high enough mah or not.

looks like the plane will be running 5 MKS7777A+ servos and a jr throttle.

with those batterys the system can handle the 7.4 volts w/o need for any regulators or anything correct?


Sorry OP, not trying take over just thought since on the subject of it. i would ask.


what amps can the Fromeco Relions take? they can be charged pretty quick like a A123 right?

LiIons cannot be fast charged (see document below from Fromeco web site).
On 35% and above, we generally use two 5200mAh on the receiver, one 2600mah on the ignition.
We do not use ibec systems, and I will not discuss (again) why here.
Some of our top pilots use small Lipos on the receiver but need to charge every three flights (as small as two 1300mAh - replaced or recharged after every flight).



We all use a separate ignition battery, generally with an optical kill switch (generally Smartfly).
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Old 06-11-2019, 09:03 PM
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Originally Posted by Islandflyer View Post
LiIons cannot be fast charged (see document below from Fromeco web site).
On 35% and above, we generally use two 5200mAh on the receiver, one 2600mah on the ignition.
We do not use ibec systems, and I will not discuss (again) why here.
Some of our top pilots use small Lipos on the receiver but need to charge every three flights (as small as two 1300mAh - replaced or recharged after every flight).



We all use a separate ignition battery, generally with an optical kill switch (generally Smartfly).

Oh thanks and seems like everyone uses different set ups. the plane had three lipos in it but i do not like the idea of lipos in a plane. that not electric powered.
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Old 06-11-2019, 09:39 PM
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Oh thanks and seems like everyone uses different set ups. the plane had three lipos in it but i do not like the idea of lipos in a plane. that not electric powered.
Everyone has their view of what works just like my last post over on your red top thread, check it out. Find what sounds like a way you want to go and go. Most any group of like's, like's LiPo's, like's Li-Ion, like's IBEC's, etc have been around long enough for anyone to see any direction works just as well.
If it is an ARF where the canopy hatch is easily removed there is nothing wrong with any battery chemistry as it can easily be removed. I use LiPo's on all my ARF's and Li-Ion on my scale builds.
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Old 06-12-2019, 07:11 AM
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Originally Posted by Islandflyer View Post
LiIons cannot be fast charged (see document below from Fromeco web site).
On 35% and above, we generally use two 5200mAh on the receiver, one 2600mah on the ignition.
We do not use ibec systems, and I will not discuss (again) why here.
Some of our top pilots use small Lipos on the receiver but need to charge every three flights (as small as two 1300mAh - replaced or recharged after every flight).



We all use a separate ignition battery, generally with an optical kill switch (generally Smartfly).
“We do not use ibec systems, and I will not discuss (again) why here”.

I’d be interested in hearing that. I have never heard an engineering based reason why not.
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Old 06-12-2019, 07:22 AM
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“We do not use ibec systems, and I will not discuss (again) why here”.

I’d be interested in hearing that. I have never heard an engineering based reason why not.
Because everybody has their opinion and some are set in stone.
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Old 06-12-2019, 11:40 AM
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So if you use 2 packs that's a CONSTANT draw of 66 amps. If your plane is pulling even 33 amps continuous then you have a serious issue. Don't confuse continuous with spikes. A 33 amp continuous rating means you can easily handle spikes mush higher.

And we're not talking about a starter battery. Just sayin' Apples and donuts.

+10000


People go nuts obsessing over these unrealistic peak values - forgetting that if something on the servo bus is actually drawing 30 or 60 amps the battery is the least of your issues.... wires would be melting, etc..







OP - to add to your confusion, in addition to LiIon and LiPo lots of folks use LiFe/A123.. I dont want to start another debate but if you are starting from scratch you should research all 3 options.
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Old 06-12-2019, 10:37 PM
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I have used Fromeco LiIons for a long time and they have never let me down. One thing I really like is to be able to load test my battery before flight with my Fromeco 8-Ball. You simply cant do that with a LIPO or a A123. Knowing my batteries load test properly gives me a warm fuzzy.


In stock at Aircraft International

http://www.aircraftinternational.com...7/Default.aspx
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Old 06-12-2019, 10:42 PM
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So if you use 2 packs that's a CONSTANT draw of 66 amps. If your plane is pulling even 33 amps continuous then you have a serious issue. Don't confuse continuous with spikes. A 33 amp continuous rating means you can easily handle spikes mush higher.

And we're not talking about a starter battery. Just sayin' Apples and donuts.
^^ Agree 100%, you have completely screwed up your airplane setup if ur pulling huge amps at baseline.
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