Motors an Batteries

[fabricator]

Hello all, rank newb sigining in:) I am just getting into the electric thing, I put together a Great Planes yardstick and was disappointed because it was very underpowered, it would kinda hang on the prop for about twenty five feet then self land:rolleyes: Anyway I went to the LHS and the owner set me up with a GWS 350c and what a difference! This thing will almost do 3D stuff:D It is an absolute pleasure to fly at half throttle, oh yeah I also switched from 1250mAhr electrifly 7.4 volt lipo to 1500 mAhr kokam 11.1 volt Lipo, so it'll fly for about 30 mins.
My question is, am I going to burn the motor up with the bigger lipo? How do you know what voltage a particular motor will handle? Or is the Amperage more important? If so, how do I know what Amperage my motor will handle? if these are dumb questions I apologize, but so far, not only dont I know anything, I dont even suspect anything yet.:confused:

[Twmaster]

11.1 V is too much for the GWS 350 motors. I smoked one on 9.6V. There are a few threads here regarding the Slow Stick (very similar bird to your yard stick) that discuss motor and cells. Also, the GWS web site has loads of info regarding cell count and prop sizes for all of their power systems. Get a cup of coffee, read, learn!:)

Oh, almost forgot. Welcome aboard. E-flight is addictive. Leave your wallet with your LHS!

[fabricator]

11.1 V is too much for the GWS 350 motors. I smoked one on 9.6V. There are a few threads here regarding the Slow Stick (very similar bird to your yard stick) that discuss motor and cells. Also, the GWS web site has loads of info regarding cell count and prop sizes for all of their power systems. Get a cup of coffee, read, learn!:)

Oh, almost forgot. Welcome aboard. E-flight is addictive. Leave your wallet with your LHS!

Thaks for the info, yeah I think I'm gonna be spending a lot of time here, oh and my LHS keeps my debit car in the register drawer already.:D

[GallopingGhost]

I also have a Yard Stick and mine flew but it would't do anything but maintain launch altitude. I will be doing a motor swap as soon as the urge strikes. As for the 11.1 Li po I recently smoked a 370 after 2 flights on 11.1. It was a impressive little guy that didn't live. Thats the only bad thing I have found about Li Po's the huge jump in voltage doesn't leave much in the middle. 8.4 would probably be safe to try.

[Twmaster]

8.4V (7 cells NiCD or NiMH) works well on the GWS 350 power set. I've flown my SS many times with that setup. 8 cells was just too much.

[ForestCam]

Well since you already dropped the coin on a kokam get rid of the gearbox and drop a little more on an EP283012-970KV outrunner and a brushless ESC from GWSexpert.com.
You won't be dissapointed.:eek:

[Unbalanced prop]

Thaks for the info, yeah I think I'm gonna be spending a lot of time here, oh and my LHS keeps my debit car in the register drawer already.:D

If you plan on staying in the electric RC field, I would strongly suggest you get some sort of meter such as the Wattmeter by Astroflight or E-meter by Hyperion to be able and see how much current you are pulling so as not to ruin motors, batteries and ESCs. I used to burn up all kinds of things :o before I got myself a meter to measure what my changes would do to a power system. Get your LHS to charge that debit card for a meter, you won't regret it.

Doug

[Matt Kirsch]

9.6V generally works okay on the EPS350C, but you need to downsize the propeller a little to keep the Amps in the reasonable range.

Also, in practical terms, a 2S LiPoly gives about the same power as a 7-cell NiMH.

[MountainFlyer]

ive ran the GWS EPS-350C-C with an 8 cell 9.6V battery on my SmoothE since i bought it last spring. i get about 50 to 60 flights on a motor before the brushes are gone... not great but not bad either. ( i fly at full throttle most of the time btw )
As Matt said the prop is the key. i run the gws 9070 with this combo. it seems to be about as much prop as one would want to run on the motor/gearbox combo with out getting it way too hot. if you need a 10 or 11 inch prop run a D gearbox that should help extent the life of the motor a bit. and also remember that if your using an 11.1V battery not to run it at full throttle all the time ;)

[fabricator]

Thanks for all the great advice guys, man I love this place!:)

[Epoxycup]

Echo all the above

I have the SS and still going strong. I use many differant batteries but most are 8 cell NiCd or 2 cell LiPo ( thats 9.6v and 7.4v ). Your 11.1 volt 3 cell LiPo will make a lot of power but your motor will become toast soon.:eek: I think if you prop correctly you will find the 2 cell should still give you enough power.
Just using the two cell I have strapped on a camera, lighting (for night), and floats the SS flys with the extra wieght just fine, Not all at the same time though.:)

[fabricator]

Is there somewhere that gives definitive numbers on how much voltage a given motor size will tolerate?