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Old Oct 24, 2012, 11:52 PM
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Safe discharge voltage of stock 1500 mAH battery?

Can someone please tell me what this is?
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Old Oct 25, 2012, 12:58 AM
John
Australia, QLD, Brisbane
Joined Aug 2012
542 Posts
I believe 'The Book' says don't go down below 80% discharge - about 3.75v per cell, or 7.5 v for our standard pack. This is for standard LiPo cells, which the F45's are not.
In one way (only, probably) the stock cell may be superior: I have discharged a pack by accident to 3v total (which would normally write off a standard LiPo 2s), recharged, and used as normal again.
But think 7.2 would be a sensible absolute minimum voltage to be on the safe side. Others may have different opinions, though!
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Last edited by OldOz; Oct 25, 2012 at 01:04 AM.
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Old Oct 25, 2012, 01:33 AM
Hangin' for a strong SW
slothy89's Avatar
Australia, VIC, Sebastopol
Joined Apr 2012
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Quote:
Originally Posted by Lentar View Post
Can someone please tell me what this is?
I used to run mine down to about 3.55v per cell. Upon recharge I usually put back around 1200-1300mAh which according to my math is around 80-87% discharge a little high, but battery is still fine.

Just note this is RESTING voltage. during flight, the voltage will sag lower than this due to the nature of batteries. I set my LiPo alarm to 3.2v per cell and worked fine.

However I upgraded to Turnigy 1800mAh 40C batteries, and that has since changed everything much better reserve power and much slower voltage drop. I found the stock battery had a linear drop meaning every minute of flight was noticeably getting weaker. The Turnigys however are more exponential, the voltage barely drops until near the end. So flying is much more consistent.

From people's searches, this is the best option for upgrading the battery: 2000mAh 20C Nano-Tech from HobbyKing
It comes with a JST connector (same as stock) so no soldering required, simply adjust (remove) the tabs on the battery tray to accommodate the extra length.
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Last edited by slothy89; Oct 25, 2012 at 01:49 AM.
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Old Oct 25, 2012, 01:45 AM
John
Australia, QLD, Brisbane
Joined Aug 2012
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These are my choice, and may be another option. 2000mAh.
Does require a few mods to the tray, though has a standard JST as well..
http://www.hobbyking.com/hobbyking/s...dProduct=23820

Edit - I think we've got the same battery, Slothy - your 2200 link seems to be actually pointing to a (my?) 2000 . Whatever. They are a heck of a lot better than the stock, even with brushed motors.
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Old Oct 25, 2012, 01:50 AM
Hangin' for a strong SW
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Australia, VIC, Sebastopol
Joined Apr 2012
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Quote:
Originally Posted by OldOz View Post
These are my choice, and may be another option. 2000mAh.
Does require a few mods to the tray, though has a standard JST as well..
http://www.hobbyking.com/hobbyking/s...dProduct=23820
Woops, it's the same as the one I linked, I just got the mAh rating wrong

Been looking at getting into planes, and they all take 2200mAh 3S packs
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Old Oct 25, 2012, 06:13 AM
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The Netherlands, UT, Nieuwegein
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Wanted to order the EH200 (to make the mod from BThirsk) together with the other parts but some of them are in backorder like you can see here under, you guys have some idea's for replacing them with other ones ?

Here's my total order, did i forget something ?

OK EH200-4100 - EH200 Brushless Outrunner 4100kv $15.13 43

OK TR_B18 - TURNIGY Basic 18A v3.1 Speed Controller $13.99 45

OK TR_PC - TURNIGY BESC Programming Card $6.95 50

OK AM1001A - PolyMax 3.5mm Gold Connectors 10 PAIRS (.. $1.59 30

OK E2.0-0.5-10T - Pinion Gear 2.0mm/0.5M 10T (1pc) $0.99 5

BK E2.3-0.5-9T - Pinion Gear 2.3mm/0.5M 9T (1pc)
This item is on backorder* $0.99 5

BK ZC.1500.3S.25 - ZIPPY Compact 1500mAh 3S 25C Lipo Pack
This item is on backorder* $9.33 128

BK ZC.500.2S.25 - ZIPPY Compact 500mAh 2S 25C Lipo Pack
This item is on backorder* $4.85 41

TOTAL: $53.82 347g
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Last edited by eminemin; Oct 25, 2012 at 06:19 AM.
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Old Oct 25, 2012, 07:13 AM
Hangin' for a strong SW
slothy89's Avatar
Australia, VIC, Sebastopol
Joined Apr 2012
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Quote:
Originally Posted by eminemin View Post
Wanted to order the EH200 (to make the mod from BThirsk) together with the other parts but some of them are in backorder like you can see here under, you guys have some idea's for replacing them with other ones ?

Here's my total order, did i forget something ?

OK EH200-4100 - EH200 Brushless Outrunner 4100kv $15.13 43

OK TR_B18 - TURNIGY Basic 18A v3.1 Speed Controller $13.99 45

OK TR_PC - TURNIGY BESC Programming Card $6.95 50

OK AM1001A - PolyMax 3.5mm Gold Connectors 10 PAIRS (.. $1.59 30

OK E2.0-0.5-10T - Pinion Gear 2.0mm/0.5M 10T (1pc) $0.99 5

BK E2.3-0.5-9T - Pinion Gear 2.3mm/0.5M 9T (1pc)
This item is on backorder* $0.99 5

BK ZC.1500.3S.25 - ZIPPY Compact 1500mAh 3S 25C Lipo Pack
This item is on backorder* $9.33 128

BK ZC.500.2S.25 - ZIPPY Compact 500mAh 2S 25C Lipo Pack
This item is on backorder* $4.85 41

TOTAL: $53.82 347g
For the batteries you could use these:
Turnigy nano-Tech 1300mAh 25C 3S $13.21
Turnigy Nano-Tech 460mAh 25C 2S $4.30

They may weigh a little more, and cost a tad more, but it will get you up flying sooner

Also regarding the Pinion, there is an E-Flight 9T that has been recommended as a perfect fit in the last couple pages
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Old Oct 25, 2012, 08:13 AM
Brent 黑雁
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Canada, AB, Ponoka
Joined Jan 2012
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Heli Comparison.

I did a short video to give an idea on the different helis I have. It is only hovering in my basement in confined space, but it will give a pretty good illustration of the differences. Because if the confined area, some like the HK250 are a little different that in large open space. When I don't have to worry about running into walls, it hovers very nice, but I get a little edgy and don't want to break it. The only heli I did not demonstrate is my 600 because there is just not enough room.
Notice the V400D02 is the most stable because of it's size and I spent time to set it up as close to perfect as possible. The HK250 and the 400V2 are also set up correctly. All the others need the servos centered and the swash properly leveled. I will do that when I get time, but they fly pretty good as is.
You will notice the MJX with the flybar mod and the poor radio is no more stable than the CP helis.
I hope this give you a better idea of how they react.
Helis Hovering (5 min 42 sec)
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Old Oct 25, 2012, 09:47 AM
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Is it time for me to get a 200 class CP?

Hi All,

I am able to fly my F645 without crashing. I did not have access to any simulator or experienced instructor, and learnt to fly it purely on my own, without damaging it or requiring part replacement after crashes. I try to fly it carefully, within my skill level, and in the best possible conditions (large, open area when there is no wind, usually in the early morning)

I was wondering if it would be a good idea to also get a 200 class flybarless CP like the Master CP? (Not interested in a micro CP). Will my flying skills on my F645 be enough to operate this? (I understand that response will be faster on a CP, but think that the basic hand-eye skills should be easily adjusted to compensate? Or am I wrong?)

Basically what I'm asking is when can a F645 user contemplate moving to something more advanced?

Thanks,
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Old Oct 25, 2012, 09:56 AM
Brent 黑雁
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Canada, AB, Ponoka
Joined Jan 2012
1,756 Posts
Quote:
Originally Posted by Lentar View Post
Hi All,

I am able to fly my F645 without crashing. I did not have access to any simulator or experienced instructor, and learnt to fly it purely on my own, without damaging it or requiring part replacement after crashes. I try to fly it carefully, within my skill level, and in the best possible conditions (large, open area when there is no wind, usually in the early morning)

I was wondering if it would be a good idea to also get a 200 class flybarless CP like the Master CP? (Not interested in a micro CP). Will my flying skills on my F645 be enough to operate this? (I understand that response will be faster on a CP, but think that the basic hand-eye skills should be easily adjusted to compensate? Or am I wrong?)

Basically what I'm asking is when can a F645 user contemplate moving to something more advanced?

Thanks,
Sure you can. I would advise getting a flight sim, though.
When the heli is coming at you, you have to remember the AIL controls are reversed and even though ELV are not, your brain thinks they are because the heli is facing the wrong way.
You can practice on the MJX, but it is not the same as a CP because it self stabilizes. The sim will be more like real. It's not hard, but it does take some practice to retrain your brain an muscle reactions.
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Old Oct 25, 2012, 10:12 AM
Fly Fast, Fly Hard, Fly Fun
rexless's Avatar
Canada, BC
Joined Apr 2012
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Quote:
Originally Posted by BThirsk View Post
I did a short video...http://youtu.be/bPeaeq1nNe0
Thanks for that Brent! A few of those bigger helis could really do a number on that drywall eh?
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Old Oct 25, 2012, 10:21 AM
Brent 黑雁
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Canada, AB, Ponoka
Joined Jan 2012
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Quote:
Originally Posted by rexless View Post
Thanks for that Brent! A few of those bigger helis could really do a number on that drywall eh?
I used to be easier before I became a storage depot for my kids furniture til he and his family find a place to live. Makes my hands shakey in the confined area.
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Old Oct 25, 2012, 11:16 AM
Different fly 4 different guy
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Canada, BC, Salmon Arm
Joined Jan 2011
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Quote:
Originally Posted by BThirsk View Post
I did a short video to give an idea on the different helis I have. It is only hovering in my basement in confined space, but it will give a pretty good illustration of the differences. . . .
That video was very informative - thank you!

It looks like the mini-cp is either very stable or you have the most confidence in your ability to fly it in the combined space.

I have been contemplating trying something like a mini-cp, NE 125a or nano cpx. But for now my fav is the MJX x100 quad. Winter is close.

regards . . . g
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Old Oct 25, 2012, 11:24 AM
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Joined Jul 2012
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Has someone the best solution to convert to tail brushless ?
because with EH200 the stock tail motor will overload soon . and i didn't see anyone that have a stable brushless tail .
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Old Oct 25, 2012, 11:36 AM
Brent 黑雁
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Canada, AB, Ponoka
Joined Jan 2012
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Quote:
Originally Posted by gordonzo View Post
That video was very informative - thank you!

It looks like the mini-cp is either very stable or you have the most confidence in your ability to fly it in the combined space.

I have been contemplating trying something like a mini-cp, NE 125a or nano cpx. But for now my fav is the MJX x100 quad. Winter is close.

regards . . . g
The mini is very stable even in the Sh*ty set up it is in now. I have only flown it about 6 batteries so far, but am happy. I also looked at the nano, but I wanted to use with my devo8. As it turns out, I will be changing the fireware to deviation and would be able to use SPectrum RX in the nano. Who knows, maybe I'll get one for Christmas.
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