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Old Feb 18, 2013, 02:29 PM
SUCK LESS
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United States, IL, Lombard
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Originally Posted by psguardian View Post
Taxes are coming & the stars are aligning...

I have a swift NX lined up, I'm battery shopping, need input.
I am a fan of higher volts/lower amps, and the bird is set up as a 6s power train.

Does anyone have first hand experience with: zippy flightmax, zippy compact, turnigy (not nano-tech) 6s lines? Are they suitable for these helis?
I have 3x turnigy 3s 2200mah 40c packs that I run on my planes, could I just get a few more of these & run two or four in 6s configs?

How heavy can I go on the lipo without needing to add ballast aft of the main shaft?

~psguardian
I recall others saying they used 6S 5000mAh packs on the NX without any CG issues. Personally I've been running 6S 3300mAh without problems as well.

Those 3S 2200mAh packs could be used (in series) if you run at lower headspeeds, at least that's what I'm seeing on my setup. That C rating would have to be legitimate (40C) if running at 2000 RPM, but then you'd only get a few minutes at most. As far as using 4, (2 in series, then 2 sets of those in parallel) you'd have a bit of work on your plate in finding a decent way to mount them all, wire them up, and keep them secure during flight. This is where a single, larger pack might be easier to arm wrestle with ...
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Old Feb 18, 2013, 03:19 PM
If I build it, it will fly
United States, NY, East Rochester
Joined Jan 2012
712 Posts
I am good with a soldering iron, harnesses are no issue... Still not really fond of the 4-pack idea though LoL.

This NX comes with the 6s 1110kv & 5s 1300kv motors.

Not going to have $$ for a second set of batteries for a while so I want to get it right the first time...

I want to keep the throttle at/over 80% & headspeed in the 'learners permit' range (1650?).

6s x 1110kv(90% eff?) x 9t pinion = governor @ 1650HS (pitch to 11.5 before it drops)
5s x 1110kv(90% eff?) x 11t pinion = governor @ 1650HS (pitch to 9.5 before it drops)
5s x 1300kv(90% eff?) x 9t pinion = governor @ 1650HS (pitch to 9.3 before it drops)

What do you think?

~psguardian
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Old Feb 18, 2013, 03:57 PM
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The 6S 1110kV combo really only allows for the 9T pinion as that gearing puts you very close to 2100 RPM (max. recommended by Century). The only other option is the 8T pinion, but it's evil and we're supposed to stay away from it

The 5S 1110kV combo will allow for 9T, 10T, and 11T, if you want a wider choice of head speeds & gearing options. Again, sans 8T.

I've been unable to get my Swift NX to run at 1600 RPMs - either my Century 1110kV (as marked) is really a 1300kV or the Century 80/100A ESC, with 80% throttle curves, doesn't function like it should (instead I get 2000-2100 RPMs ? ), so I can't comment on how the 6S 1110kV combo works in that lower RPM range. On my Swift 16, the 1600 head speed range seems pretty decent - I've only tried it once or twice so far. But, that's with the 800kV motor, 12T pinion, 80% throttle curve and an ESC that supports active freewheeling.
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Old Feb 18, 2013, 05:23 PM
If I build it, it will fly
United States, NY, East Rochester
Joined Jan 2012
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Quote:
Originally Posted by FR4-Pilot View Post
The 6S 1110kV combo really only allows for the 9T pinion as that gearing puts you very close to 2100 RPM (max. recommended by Century).

The 5S 1110kV combo will allow for 9T, 10T, and 11T, if you want a wider choice of head speeds & gearing options.
This also assumes a properly labeled 1110kv motor LoL. I think it was just your ESC. I like the idea of one battery & 3 diff pinions.

Would you call 1500HS trainer friendly?
5s x 1110kv x 10t x 1500gov = 3 hover & 11.5 befor it bogs.
(#s from dark horse w/nofudge, mid Batt voltage, 90% eff)

~psguardian
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Old Feb 18, 2013, 06:46 PM
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I would say 1500 is trainer friendly - you'll have to see if you like it or not. I've found I need to remove some of the expo I had for the cyclics and dual rates I had for the tail since everything slows down with the headspeed. So far I like it for just flying around, but that's me

By training do you mean tail-in hover practice?
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Old Feb 18, 2013, 07:03 PM
If I build it, it will fly
United States, NY, East Rochester
Joined Jan 2012
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I have destroyed two hk450s attempting circuits before I was ready... And I think a sticky tail setup helped in the destruction of the second one..

I now have Phoenix v4 & an putting a couple hours a week on the swift... Can't figure out how to get idleup with neg pitch to work though...

I can hover no issue, will not be taking this bird up until I am solid on the Sim, but yes slow & easy to begin with.

~psguardian
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Old Feb 19, 2013, 05:58 AM
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Planning on this build.

Swift NX + Motor combo : $170
RJX .50 FBL head: $65 (from HK)
Robird G31: $90 (been using one on my 500 with great results)
3x MKS DS1210: $105 (these are water resistant offroad steering servos but I have read they also make strong cyclic servos)
Hyperion DS20-GMD: $39
YEP100 ESC: $42
FrSky D8R-XP-8 Reciever: $27
TIG Z-weave carbon fiber blades: $40 (may also get a set of cheap woodies or FG blades for maiden and shakedown flight in case something happens)

Total: $578

Anyone see any problems?

The MKS DS1210's have a maximum operating frequency of 120hz but the closest setting on the Robird G31 is 125hz, think this will be ok? I tried lowering the cyclics on the Robird I have on my 500 to 125hz without touching anything else and it flew exactly the same so I don't think the lower frequency will cause any performance problems.

Can the Swift NX use 550mm blades without modification? What are the advantages and disadvantages of using 550mm blades instead of 520mm?

What are the specs of the motor that comes with the combo?

Does it come with tail blades or do I need to buy those as well?
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Old Feb 19, 2013, 02:38 PM
SUCK LESS
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I can answer a few things - can't help with FBL stuff though ...

Yes it comes with tail blades - black plastic, around 70mm I believe.

Yes it can use 550mm blades without mods. 520s will (in general) consume less power (less drag), have a little less lift, will cost a little less, and will result it slightly quicker response. 550s will consume a little more power, have more lift, cost more, and will have slightly slower response. The Century wood 520s are amazingly good quality blades - at least the ones I've gotten with my kits - and they're like $14.

I have the spec sheet for the Lightning 550 1300kV motor - I can scan it and post it this evening after work. If I recall it didn't have a whole lot of info. I see Century has terminated/discontinued their 1100kV, 800kV, and 565kV motors - major bummer!
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Old Feb 19, 2013, 04:05 PM
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Why is the Swift 550 carbon less than the Swift 550 NX? I heard somewhere that it's been discontinued is that true?
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Old Feb 19, 2013, 06:01 PM
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I heard the same. Maybe they'll offer an upgraded/carbon/all metal/FBL NX package soon ... (?)

I've attached the motor info sheets for the 565kV, 800kV and 1300kV motors. I need the same for the Century 1110kV - does anyone have that info to post?
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Old Feb 20, 2013, 03:01 AM
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Quote:
Originally Posted by FR4-Pilot View Post
I heard the same. Maybe they'll offer an upgraded/carbon/all metal/FBL NX package soon ... (?)

I've attached the motor info sheets for the 565kV, 800kV and 1300kV motors. I need the same for the Century 1110kV - does anyone have that info to post?
Wait the 1300kv motor is 5S max, in a 550 size helicopter? My 500 feels anemic on 5S I can't imagine what a 550 would be like.

I think maybe I'll get the 550 carbon and a relabeled Suppo motor from HK. (I'm using Suppos in my 450s and 500) If it ever gets to the point I can't get replacement parts I could always just move the electronics to an NX airframe and use the metal swash and motor mount as upgrades.

http://www.hobbyking.com/hobbyking/s...ass_Heli_.html
http://www.hobbyking.com/hobbyking/s...ass_Heli_.html

What would be the best KV and pinion for 6S and 520mm blades on a Swift 16 / 550 Carbon? looking to run the head at around 1800-1900 rpm.
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Old Feb 20, 2013, 01:54 PM
AMA# SIMAGES
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Hudson Valley
Joined Dec 2006
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Quote:
Originally Posted by Atomic Skull View Post
What would be the best KV and pinion for 6S and 520mm blades on a Swift 16 / 550 Carbon? looking to run the head at around 1800-1900 rpm.
Oh what do you think guys.....a Swift 6s at 85% with a 10T could be achieved with a 900kv?

Great tools HERE

Mr Mel's Headspeed Calculator

Dark Horse Calculator
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Old Feb 20, 2013, 05:27 PM
SUCK LESS
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United States, IL, Lombard
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I too would go with a lower kV like 800 or 900. That way you have the most options for pinions (9, 10, 11, 12, etc.), head speeds and throttle curves. Lower kV motors tend to be a little more efficient as well. I really like the Century 800kV - too bad they discontinued it. I would trade my 1110kV for one in a heartbeat. For 6S setup that is

Just make sure you have a source for pinions with those HK motors - they have 6mm shafts, the Century pinions are for 5mm. Also keep in mind that the Swift main gear only has 96 teeth, unlike the Trex's that have over 160.
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Old Feb 20, 2013, 09:01 PM
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Ok now I'm confused, the Century 1300kv motor says maximum voltage is 18.5v / 5S but a 5S lipo is 21v fully charged. so it can really handle 21v?

Think a 6S LiFePo4 would be a problem at 22v fully charged?

what's the largest battery size you can stick on a Swift NX?
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Old Feb 20, 2013, 09:35 PM
If I build it, it will fly
United States, NY, East Rochester
Joined Jan 2012
712 Posts
18.5v is the nominal voltage of a 5s lipo under load. 3.7x5=18.5v So any constant supply that sits idle near 21v & sags from there under load should be fine, electrically speaking.

I've never done it, so take this with a grain of salt & anyone with proof contrary please correct if i'm wrong.

~psguardian
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