Jan 08, 2013, 09:11 PM Rockin' & Flyin' Virginia Beach Joined Dec 2009 2,969 Posts Ah! Got it figured out. Here's the Excel formula: =-1822.8*(A2*A2)+(12346*A2)-20326 A2 is post-flight voltage (enter it).
 Jan 08, 2013, 09:19 PM Epilepsy Awareness United States, MA, Malden Joined Mar 2008 13,908 Posts It's good to know we have some brains around here...lol. Don't count on me with these formulas. I suck at math to a point. I just watch what was put back into the batt, and, if I'm satisfied, so is the batt. BUT, as I get into 3S 1300mah, first charge will be a single batt balance charge and not parallel. I'll be paying closer attention...heck, \$24.00 batteries Got two for Christmas Mike.
Jan 08, 2013, 09:23 PM
Look ma, no hands!
United States, WI, Sheboygan
Joined Aug 2011
1,252 Posts
Quote:
 Originally Posted by Saxguy1000 Ah! Got it figured out. Here's the Excel formula: =-1822.8*(A2*A2)+(12346*A2)-20326 A2 is post-flight voltage (enter it).
That works too. In the words of Euclid, "There's more than one way to skin a cat." (did he really say that? I dunno, go ask him )

btw I tried a linear equation but it didn't fit the curve nearly as well. I'll fool around with some more polynomials and see what works best.
Jan 08, 2013, 09:25 PM
Look ma, no hands!
United States, WI, Sheboygan
Joined Aug 2011
1,252 Posts
Quote:
 Originally Posted by Chap1012 It's good to know we have some brains around here...lol. Don't count on me with these formulas. I suck at math to a point. I just watch what was put back into the batt, and, if I'm satisfied, so is the batt. BUT, as I get into 3S 1300mah, first charge will be a single batt balance charge and not parallel. I'll be paying closer attention...heck, \$24.00 batteries Got two for Christmas Mike.
Jan 08, 2013, 09:30 PM
Epilepsy Awareness
United States, MA, Malden
Joined Mar 2008
13,908 Posts
Quote:
 Originally Posted by 1Pilgrim That works too. In the words of Euclid, "There's more than one way to skin a cat." (did he really say that? I dunno, go ask him ) btw I tried a linear equation but it didn't fit the curve nearly as well. I'll fool around with some more polynomials and see what works best.
Are you talking about "Gracie" the CG kitty cat

Mike.
 Jan 08, 2013, 11:25 PM Registered User United States, OK, Oklahoma City Joined Dec 2012 20 Posts hey guys i am going to be getting this chopper soon and i was wondering were ridgewalker got the body of the jet ranger i like the look of it and if no one can recall what i am talking about its on page 105 first post on page i really think that body completes the helicopter
Jan 08, 2013, 11:34 PM
It flies!!! ... so who cares ?
Joined Mar 2009
10,989 Posts
Quote:
 Originally Posted by lucky73129 hey guys i am going to be getting this chopper soon and i was wondering were ridgewalker got the body of the jet ranger i like the look of it and if no one can recall what i am talking about its on page 105 first post on page i really think that body completes the helicopter
the post that you mention tells you everything you need to know - the body is from Eflite/Horizon and was made for the CX2.
If you want to find one of these, how about you put CX2 jet ranger in google?? (and I bet you get more results than countable ...)
Also, someone just offered EIGHT of these for sale in the classifieds (I think yesterday, even in different colors!)

Good luck with "your" search ...
Edit: sorry, I should have left the "" out, but ... the answer is kind of really too obvious in the post you mention ...
Jan 08, 2013, 11:41 PM
Registered User
United States, OK, Oklahoma City
Joined Dec 2012
20 Posts
Quote:
 Originally Posted by erdnuckel2 the post that you mention tells you everything you need to know - the body is from Eflite/Horizon and was made for the CX2. If you want to find one of these, how about you put CX2 jet ranger in google?? (and I bet you get more results than countable ...) Also, someone just offered EIGHT of these for sale in the classifieds (I think yesterday, even in different colors!) Good luck with "your" search ... Edit: sorry, I should have left the "" out, but ... the answer is kind of really too obvious in the post you mention ...
lol thanks man i some how missed that guess its time to sleep
 Jan 08, 2013, 11:48 PM Registered User Australia, NSW, Sydney Joined Dec 2012 25 Posts Thanks for the welcome Chap...and I have a pretty thick skin...lol.... My experience began when a mate of mine gave me a 3ch toy heli...that got me interested. 2months of reading and research led me to get a Blade 450 RTF....with included DX6i...and a 120SR BNF. I started with Phoenix sim...spent hours on it with all the helis. Then read and followed ALL this thread...don't really feel all that new to it now...lol. I have Salts ebooks...and have been through them a number of times...and as far as lipos....Salt has a good section on his website...and have pulled info from a few sites....and will go to your recommended site as well..thanx for that. As far as the flying goes...I started slowly with the 120SR and got hovering and stability under control..getting turns and fig8s happening..at a leisurely pace. Coped with pendulum effect and a little TBE. I dont have any indoor room to speak of so I have an MCX2 and aV911 for indoors....the 450 stays in the box for the moment ! Because of the winds here....I usually get down to the local park at 6am....getting snooty looks from the dog walkers..lol...but I fly from the cricket pitch area in the centre...plenty of room....I'm thinking anothe couple of months and I'll strap the training gear onto the 450 and begin. Min the mean time....the 120SR is a constant source of fun and intrigue....I feel like I know all you guys already.... all the best
Jan 09, 2013, 02:12 AM
Against Helicopter Cruelty
Joined Aug 2011
7,174 Posts
Quote:
 Originally Posted by Saxguy1000 Ah! Got it figured out. Here's the Excel formula: =-1822.8*(A2*A2)+(12346*A2)-20326 A2 is post-flight voltage (enter it).
I plugged that formula in and it told me that it's gonna rain tomorrow. What did I do wrong?
Jan 09, 2013, 03:54 AM
Rockin' & Flyin'
Virginia Beach
Joined Dec 2009
2,969 Posts
Quote:
 Originally Posted by Heli Pad I plugged that formula in and it told me that it's gonna rain tomorrow. What did I do wrong?
I think I need to tweak it a little more to make it sunny and 0 mph winds.
Jan 09, 2013, 03:57 AM
Rockin' & Flyin'
Virginia Beach
Joined Dec 2009
2,969 Posts
Quote:
 Originally Posted by lucky73129 hey guys i am going to be getting this chopper soon and i was wondering were ridgewalker got the body of the jet ranger i like the look of it and if no one can recall what i am talking about its on page 105 first post on page i really think that body completes the helicopter
I have to agree with you, Luck. Can't tell if you are experienced heli guy, but you do realize that there are alterations you have to make to get it to work on this SR 120? If you are new to helis, I'd recommend that you start with the stock set up and get used to how it flies before doing any mods.
Jan 09, 2013, 05:46 AM
Wind you go around in circles
United States, FL, Middleburg
Joined Jan 2012
1,503 Posts
Quote:
 Originally Posted by Saxguy1000 I think I need to tweak it a little more to make it sunny and 0 mph winds.
I think you got it Sax, it is getting in the 80's here with light wind. WS
Jan 09, 2013, 08:24 AM
Registered User
United States, OK, Oklahoma City
Joined Dec 2012
20 Posts
Quote:
 Originally Posted by Saxguy1000 I have to agree with you, Luck. Can't tell if you are experienced heli guy, but you do realize that there are alterations you have to make to get it to work on this SR 120? If you are new to helis, I'd recommend that you start with the stock set up and get used to how it flies before doing any mods.
well i do have some experience flying helicopters i have a dh 9104 a s031g a dh 9053 and a s109 i just want to get away from the coaxial birds
Jan 09, 2013, 08:33 AM
Registered User
United States, NH
Joined Nov 2012
72 Posts
Quote:
 Originally Posted by Saxguy1000 Ah! Got it figured out. Here's the Excel formula: =-1822.8*(A2*A2)+(12346*A2)-20326 A2 is post-flight voltage (enter it).
Ok spreadsheet wizard, I have a sheet that I'm using to track my batteries, it has a column (column E) for the after flight voltage, and for the life of me I can't figure out how to have a column with your formula to give me the remaining %

I get it set up and get some wacky number, like 365.6453 for an ending voltage of 3.78
Last edited by DaveNH; Jan 09, 2013 at 09:08 AM.