Skywalker 1900......4S....or 3S...???

[Ratty]

I don't know enough to give you a technical answer, but the charger will stop that happening.

We used to use a single lead acid to charge our 6s heli batteries, so it will defo work.

[FPVSteve]

Ah right my bad, I missed the part about using a charger :laugh:

[Ratty]

Oh yer you don't want to wire your flight pack straight to your charge battery. That will likely result in a puffy battery at best and a fire at worst.  ;D


Field battery (whether it be lead acid or big lipo) ----  charger ----   flight packs.

[Ratty]

Thanks Ratty..

Oh, I just quickly read my charger Manual, it's an Overlander Charger...It states a DC input max of 18vdc...but says it will do up to 6S...But is that when its on Mains Supply?.....Confused...:(

Anybody else got an opinion?

:vulture:

The 18v is the max input it will take, and the 6s is the max output it will give.


My technical knowledge isn't the best, but I think if you look at the out put in watts rather than volts, the input and output voltage dont have to match.

For example, its being powered by 12v 10000mah battery = 120W

Now you want to charge a 4s, which is ~16v. 120w/16v = 7.5a max charge rate at 16v

I think that's how it works, someone will correct me if im wrong.  ;D

[AerialAdventurer]

The Skywalker 1900 E/T Vector I built and reviewed last year used the Multistar 4s 10,000mAh battery you mentioned on the first page. It works well. Balancing the nose required a little lead, but nothing silly.

I certainly wouldn't want to fly mine on 3S. I'm using a recycled 4-Max PPPO-3536 910 KV motor, which is maybe a little on the low KV side. Takeoff is at WOT and described as "lumbering".. Fine when cruising on the level at half power though.

[English Turbines]

The 18v is the max input it will take, and the 6s is the max output it will give.


My technical knowledge isn't the best, but I think if you look at the out put in watts rather than volts, the input and output voltage dont have to match.

For example, its being powered by 12v 10000mah battery = 120W

Now you want to charge a 4s, which is ~16v. 120w/16v = 7.5a max charge rate at 16v

I think that's how it works, someone will correct me if im wrong.  ;D

Thanx Ratty,

Never used more than 3S before, this is why I asked the question. I'm no expert on electronics, but I can only assume it charges individual cells, so on a 4S in pairs maybe through the balance lead?
Dunno, it doesn't explain how in my Manual, and because its a Mains and DC input charger, the Manual simply does not say.
Seems like I started a bit of a debate here...lol.

:vulture:

[English Turbines]

The Skywalker 1900 E/T Vector I built and reviewed last year used the Multistar 4s 10,000mAh battery you mentioned on the first page. It works well. Balancing the nose required a little lead, but nothing silly.

I certainly wouldn't want to fly mine on 3S. I'm using a recycled 4-Max PPPO-3536 910 KV motor, which is maybe a little on the low KV side. Takeoff is at WOT and described as "lumbering".. Fine when cruising on the level at half power though.

Hi M8,

Thats interesting, Im using a 1200KV motor, so I may need to choose a slightly less pitch or smaller prop.....So, what prop size (and Brand) did you use..???

Thanx..:)

:vulture:

[AerialAdventurer]

English Turbines,

1200kv should be fine, but hop on the ole' eCalc Prop Calc website and plug in your numbers to check the thrust ratio and current draw.

I used a TGS Precision Sport 9×6 propeller from HK. You might want to try a 9x4 at a guess.

Do a web search for 'aerial adventurer skywalker 1900' - I wrote a big photo build log article on my build, I expect you will find it quite useful. I won't link to it here to avoid getting my wrists slapped...  ;)

[English Turbines]

English Turbines,

1200kv should be fine, but hop on the ole' eCalc Prop Calc website and plug in your numbers to check the thrust ratio and current draw.

I used a TGS Precision Sport 9×6 propeller from HK. You might want to try a 9x4 at a guess.

Do a web search for 'aerial adventurer skywalker 1900' - I wrote a big photo build log article on my build, I expect you will find it quite useful. I won't link to it here to avoid getting my wrists slapped...  ;)

Thanx Adventurer,

It looks like an interesting build log with lots of Pics, I bookmarked it...I always like looking at others builds, you can always pick up some good ideas as FPV layout is always a bit of a compromise...

:vulture:

[AerialAdventurer]

Glad you liked it. Overall I like the plane.. Don't do what I did and put the VTX on the tail though, that was a mistake in balancing terms, should have done the usual 'put it on the wing tip' approach. Good luck with your build  :D

[English Turbines]

Glad you liked it. Overall I like the plane.. Don't do what I did and put the VTX on the tail though, that was a mistake in balancing terms, should have done the usual 'put it on the wing tip' approach. Good luck with your build  :D

Lol...yes the VTX on the Tailplane did surprise me a little....How long a cruising flight did you manage using the 10amp 4S Lipo?

Mine will be on UHF and 1280mhz Video with a Cyclops Storm to look after it...:)

:vulture:

[FPVSteve]

An hour should easily be achievable with the 10A battery.

Mine cruises at 6-8A so 80% of a 10A battery will give me an hour (in theory!)

Only real reason I haven't checked it out is because my small batteries powering my goggles + video gear onboard the plane won't last an hour :laugh:

[AerialAdventurer]

Yes about an hour sounds doable with a respectable wind. In my maiden flight video you can see the OSD at the end, it used 940mAh in about 10 minutes. That was with extra throttle too because I was bricking it maidening my £400 plane lol.

[English Turbines]

An hour sounds good....Im going to keep it simple and streamlined as possible, its a big plane...I would have preferred the 1680mm version, but the price was stupid...If it needs it, it will be getting its wings clipped...:)

:vulture:

[iwan_canobi]

Just noticed the V6 1680 is down to £65 on HK UK warehouse. Must. Resist.