Your opinions on this set up

[Trento]

I have a Hacker A80-10 and a SS 160HV ESC whch will be installed in a 22LB + batteries 1/5th scale model using a 3 Balde 24x12 Prop. Will two of these batteries in series be adequate. Gens ace 5300mah 6S1P 22.2V 30C Lipo battery pack. Opinions on flight duration.

Thanks for any help.

[solentlife]

Just a quick question ... any reason for the MASSIVE font size you use in your post ?

As to answer ... no idea !

[quorneng]

Trento
The calculation is fairly simple.
Say you are going to get 40V on load from the two packs in series.
Your Hacker is rated at 5000W max so lets say 4000W as a continuous rating.
To achieve this from 40V you will need 100A or close to 20C from a 5300mAh battery.
At that power level the batteries will last just over 3 minutes.
I hope this helps.
What plane is it?

[Trento]

Originally Posted by quorneng

Trento
The calculation is fairly simple.
Say you are going to get 40V on load from the two packs in series.
Your Hacker is rated at 5000W max so lets say 4000W as a continuous rating.
To achieve this from 40V you will need 100A or close to 20C from a 5300mAh battery.
At that power level the batteries will last just over 3 minutes.
I hope this helps.
What plane is it?

Thanks! It's a P-39 Airacobra image here. I would like to get at least 5 minutes duration from the batteries.

[kyleservicetech]

Originally Posted by Trento

I have a Hacker A80-10 and a SS 160HV ESC whch will be installed in a 22LB + batteries 1/5th scale model using a 3 Balde 24x12 Prop. Will two of these batteries in series be adequate. Gens ace 5300mah 6S1P 22.2V 30C Lipo battery pack. Opinions on flight duration.

Thanks for any help.

This is the same setup recommended by Hacker:
http://www.hackerbrushless.com/Motor...=A80-10#A80-10

And, generally Hacker is pretty close on their recommendations. (I've got seven of them from an A30 through an A60-16M, with an A60-5S on order from the LHS)

Flight duration can vary all over the map, depending on how much throttle you give the motor/esc/battery. Just backing off the throttle to 70% can double your flying time.

If you run those 5000 Mah batteries wide open for the whole flight, your battery usage rate time will be on the order of 100Amps full power/5 Amps Battery size, or C=20. And your flying time at C=20 will be 60 minutes/20C or three minutes. Again that is at full throttle for the entire flight. And depending on the model you're flying, you might be able to double that by only flying at full power when needed.

If you're flying a draggy bipe, that might need more power for the flight, and could be an issue. A local club member is getting about 5 minutes on a big bipe, running a Hacker A60-20M on a 12S2P A123 pack. On the other hand, those A123 cells can be recharged in 20 minutes with a Cellpro Powerlab 8 charger. (I've also got a 12S2P battery and that A60-16M in a model. That gets about 6 minutes, with a 3 minute reserve)

[kyleservicetech]

Originally Posted by Trento

Thanks! It's a P-39 Airacobra image here. I would like to get at least 5 minutes duration from the batteries.

Wow
With retracts and so on, that model is going to be very streamlined in flight. The in flight current should drop off a fair amound after the model gains speed. With that very high powered Hacker A80 motor, you might be able to fly at 50-60% throttle much of the flight. (5KW is 6 3/4 horsepower)

Five minutes sounds quite reasonable. If you've not purchased the batteries yet, might be a good idea to look at a higher milliampere hour rating on those batteries. It would be easier on them, plus you'll get a longer flight duration.

Those larger batteries will add more weight, so that also can be an issue.

As for charging those LiPos, if you don't have AC power available at your flying field, that could also be a problem I've had issues with those 120 Ampere Hour marine batteries not holding up while pulling 40 Amps out of a PAIR of parallel connected marine batteries. Went through five of them in four years.

Take a look at one noisy solution:
http://www.wattflyer.com/forums/showthread.php?t=63918

[Trento]

Originally Posted by kyleservicetech

This is the same setup recommended by Hacker:
http://www.hackerbrushless.com/Motor...=A80-10#A80-10

And, generally Hacker is pretty close on their recommendations. (I've got seven of them from an A30 through an A60-16M, with an A60-5S on order from the LHS)

Hacker recommends a 5000mAh 10-Cell/10S 37V is that just one battery or 2 in series ?
If I have to use more than one I'm restricted to a 5 and 7/8th inch length for the battery.

[kyleservicetech]

Originally Posted by Trento

Hacker recommends a 5000mAh 10-Cell/10S 37V is that just one battery or 2 in series ?
If I have to use more than one I'm restricted to a 5 and 7/8th inch length for the battery.

Most LiPos only come in sizes up to a 6 cell configuration. So, you'd need a pair of 5 cell 5000 Mah LiPos.

An option would be to go to those A123 cells, but in my opinion, they work best with less than about a 35 Amp load per cell. So a 12S2P pack would be good for about 70 Amps. For the same overall performance, an A123 pack is about 30% more weight than an equivalent LiPo. They are also physically larger than an equivalent LiPo. Good chance they would not fit in your model.

As for those 2300 Mah A123's, I've got four 6S2P packs, one 7S2P pack, one 6S1P pack and two 4S1P packs. Some are on their fourth flying season, and all have the same performance as when they were brand new.

One supplier of A123's is http://www.voltmanbatteries.com/serv...1-dsh-A/Detail. I've purchased from them along with several club members for a total of some 35 cells. All have been very happy with voltmanbatteries.

[Trento]

Originally Posted by kyleservicetech

Most LiPos only come in sizes up to a 6 cell configuration. So, you'd need a pair of 5 cell 5000 Mah LiPos.

An option would be to go to those A123 cells, but in my opinion, they work best with less than about a 35 Amp load per cell. So a 12S2P pack would be good for about 70 Amps. For the same overall performance, an A123 pack is about 30% more weight than an equivalent LiPo. They are also physically larger than an equivalent LiPo. Good chance they would not fit in your model.

As for those 2300 Mah A123's, I've got four 6S2P packs, one 7S2P pack, one 6S1P pack and two 4S1P packs. Some are on their fourth flying season, and all have the same performance as when they were brand new.

One supplier of A123's is http://www.voltmanbatteries.com/serv...1-dsh-A/Detail. I've purchased from them along with several club members for a total of some 35 cells. All have been very happy with voltmanbatteries.

I have a set of these for sale as they are to big for the battery area in the model.

[kyleservicetech]

Originally Posted by Trento

I have a set of these for sale as they are to big for the battery area in the model.

That looks to be configures as 9 cells long by 2 cells wide. Any chance reworking that pack to a 6 cell by 3 cell configuration would fit??

I've built up several dozen A123 packs so far. What's needed is a good temperature regulated 100 watt soldering iron for this type of work. Makes it a lot easier. Bought mine from Amazon, but places such as www.mouser.com a large electronics supplier also stocks them.

Those A123 cells generally use standard jumper straps that are easy to solder to, using plain ordinary rosin core solder. What works well to shrink wrap these cells after modification is one of those common plastic water bottles available from the grocery store. Yup, that plastic is a very good shrink wrap material.

If you should rework those cells, be danged careful of EVER shorting them out. They will melt anything in their way. I've done it, once burning a hole right through the aluminum case of the cell. That cell with the hole died after a few months, but the remaining 9 cells are still being used, 4 years later.