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Futaba-RC . Next D . Fast Lad Performance

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e-Century Hummingbird - Swift > Thinking of switching over to a123 - need advice
 
 
wrathofkhan
Veteran
Location: LA, CA - US

going back to this topic again ... i saw this generator, for less than two bills. are these any good for our purposes (and not use 12v car battery)

http://cgi.ebay.com/1250-Watt-2-Cyc...1QQcmdZViewItem

anybody have any experience with these?
04-24-2008 07:00 AM
 
 
jamesppp
Heliman
Location: carrollton georgia usa

If you decide to buy a generator, dont buy a 2 cycle motor powered model. Spend a bit more and get a nice quiet Honda or a little Coleman Powermate with around 1750 to 2000 w.output
The 2 cycle motors require mixing 2 stroke oil in the gas, either by hand or automatically. They smoke a bit and have an annoying sound.

My flats skiff(boat) has a 36V trolling motor so I have to have 3 big deep cycle batteries in maintainence mode all the time.Several years ago, I built a box that slides out on my truck tailgate that holds 2 big deepcycle batteries wired in parrallel for my field charging. I quit RC for a while and never used. I ran down big cranking battery in my truck several times charging packs for trucks and buggies when Iwas running them. I had to have a jump several times...
04-24-2008 04:56 PM
 
 
Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

^second the honda comment.

<><>...the lunatic is in my head...<><>
04-24-2008 05:07 PM
HOMEPAGE  
 
 
centuryman
Veteran
Location: deerriver,mn usa

THE HONDA 2000 watt is an ideal generator,It's quite, fuel effeciant and it's the suitcase style so it's light and easy to carry.The only down side is It sell's for $900.00.I have 3200 watt off brand that works great and only cost $350.00. The down side is it weighs twice as much and is quite a bit louder.But it holds more fuel so will run all day on a tank and it has enough wattage to run all 5 of my chargers at once.And a long extension cord takes care of the extra noise.
04-27-2008 03:03 AM
 
 
wrathofkhan
Veteran
Location: LA, CA - US

And a long extension cord takes care of the extra noise.


LOL
04-27-2008 05:39 AM
 
 
wrathofkhan
Veteran
Location: LA, CA - US

going back to the original topic.

after flying my swift with the 10s/a123 setup with neu 1910/1.5y - 10T, 550 carbons, for a while now and am getting a bit disappointed.

it is true that i am only running it with a 10t, and head speed is below 2100 (since i am using stock plastic grips) ... but when i compare with my little 450 ... it is quite tame. it just doesn't have the pop at all.

i am thinking of upgrading the grips to cnc, and try out some other motor, and go up on HS. my neu is getting a bit hot these days (weather has been in the 90s), and the motor is going up to 140 degrees farenheit right after flight. not sure if that is OK for the neu ... and i expect the temperature to increase a bit more when i try out 11t or more

any suggestion besides the z motor for this bird ... has anyone tried out the scorpions yet with a123s?
04-28-2008 06:33 AM
 
 
JustPlaneChris
Heliman
Location: Austin,TX - USA

Quote 
it is true that i am only running it with a 10t, and head speed is below 2100 (since i am using stock plastic grips) ... but when i compare with my little 450 ... it is quite tame. it just doesn't have the pop at all

Really? That's the exact setup I'm running on mine, and it seems quite powerful to me, and has at least as much vertical acceleration as my Dragonus (with a JGF 500TH). I wonder what the difference is, or maybe it's just a matter of perspective?

I do agree about the motor heat though... It gets pretty warm. I haven't seen any of the fan-equipped Scorpions with a low enough KV to use with my 10S setup. It needs to be no more than 800kv to keep the headspeed within logical limits.

-Chris
04-28-2008 03:46 PM
HOMEPAGE  
 
 
wrathofkhan
Veteran
Location: LA, CA - US

Hey Chris, aren’t you using 1907/1.5y (at least that is what I recall when you had posted before, with 515mm wood blades). Or maybe you have upgraded since then …

If you are using 1910/1.5y with 550 carbon, how many teeth pinion (10T also??) are you using? Have you measured the temperature – mine got up to 140 degrees. As far as I recall, when I was using 1907/1.5y with 5s and 515mm RTs, the motor used to be cold, not even warm – that is why I am getting a bit concerned.

Look forward to your feedback … khan
04-28-2008 07:08 PM
 
 
JustPlaneChris
Heliman
Location: Austin,TX - USA

Khan, I've always had the 1910/1.5Y. Initially I had a 9T and stock 520's. Power was OK, but not great. I went to a 10T and 550's (SAB, and more recently some 550 woodies from HD for auto practice). Power is MUCH better, but of course I lost 2.5 minutes of run time. I don't have an IR gun, and last time I had the EagleTree on the Swift I couldn't find my temperature probe, so I'm not sure just how hot it gets. But it's not comfortable to hold a finger on it for very long. Next time I take it out I'll try to remember to put the temperature probe on it (now that I've found it!).

-Chris
04-28-2008 09:18 PM
HOMEPAGE  
 
 
JustPlaneChris
Heliman
Location: Austin,TX - USA

Quote 
Next time I take it out I'll try to remember to put the temperature probe on it (now that I've found it!).
Yeah yeah, quoting myself. I took the Swift out today, shot a little video (2nd flight of auto practice below) and also did a datalog of the first flight including temperature. Enjoy!

-Chris



04-29-2008 05:31 AM
HOMEPAGE  
 
 
wrathofkhan
Veteran
Location: LA, CA - US

thank you very much Chris, your temperature never reached 140 degrees!!!
04-29-2008 06:37 AM
 
 
JustPlaneChris
Heliman
Location: Austin,TX - USA

True, it stayed relatively cool. But it was also only 75F ambient temperatures. Later in the summer it may be a different story...

Chris
04-29-2008 02:53 PM
HOMEPAGE  
 
 
wrathofkhan
Veteran
Location: LA, CA - US

this morning I was testing out my trex 450. it is very strange, I tried out bigger pinon (on my 3s a123 setup), and the motor wasn't as hot as when I was using smaller pinion - but then again, it was farily cool.

eSo, as you mentioned, the ambient temperature does affect how hot the motor gets (when i had smaller pinion - the temperature was around 90, versus around 75 this morning)
04-29-2008 05:12 PM
 
 
JustPlaneChris
Heliman
Location: Austin,TX - USA

I think it also depends on whether the gear ratio and throttle curve lets the motor find its "sweet spot" or not. If the motor is operating outside its best area of efficiency, it's going to get hotter. And of course then there's also the timing setting in the ESC. Lots of variables. But that's what makes this hobby so addictive, eh? All the tinkering?

-Chris
04-29-2008 06:26 PM
HOMEPAGE  
 
 
centuryman
Veteran
Location: deerriver,mn usa

Just tryed 8s a123's on my 6slipo swift.works great apperently there is some leeway on cc80 esc becaus it's only rated to 6s lipo,but it works fine with the 8s a123's.Flight times still only 3 minutes though.
05-05-2008 03:34 AM
 
 
wrathofkhan
Veteran
Location: LA, CA - US

there is quite a bit of leeway on these castle escs. Just to give you an example, I was using a cc35 on my trex with 3s a123s. I captured the data, and saw that there were spikes to almost 50amps, and it had no problems. on my 10s a123 setup, the spikes are over 55amps (on my jazz 55), also no problem.

I contacted Castle, they said that the esc should be able to take it easily. spiking is not a problem, but if it was 50amp continous, then it will be another story.

khan
05-05-2008 05:42 PM
 
 
oldfart
Elite Veteran
Location: Vancouver, Canada

As the number ratings of most ESC are based on a continuous amperage at max voltage (watts), most are comfortable with peaks that are a LOT higher then their continuous rating.
05-06-2008 12:08 AM
 
 
3 pages [ <<    <     1      2     ( 3 )    >    >> ]2344 viewsPOST REPLY
Esprit Model . Thunder Power RC . Real Raptors

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e-Century Hummingbird - Swift > Thinking of switching over to a123 - need advice
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