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Jan 23, 2013, 11:40 AM
Registered User
Daemon's Avatar
In a 12, the next step up is a 12x8, but at 900kv on 4S you're going to over amp it. I'd
try an 11x7. ecalc says 3.2Kg of static thrust and 78mph pitch speed.

ian
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Jan 23, 2013, 11:52 AM
RTFM
octane81's Avatar
Nobody using the 830kv Tmotor from fpvmodels?
since they sell it with the model , i would think that was a good motor?
Jan 23, 2013, 12:12 PM
USA: LakeGeorge, New York
the 800kv motor is more then enough power for mine
Jan 23, 2013, 12:40 PM
RTFM
octane81's Avatar
Quote:
Originally Posted by metalbender4by
What is every body getting for weight? Mine is 4 lb's 3 oz's with no batteries and 5lb's 9oz's ready to fly. That's with one 5000 4 cell and a 600 3 cell.
Just put mine on the scale , and it weights 2.4kg (no idea what thats in lbs and ozes) with 10.000mAh 4S.
I still need to add OSD, vTX and a small video battery.
Guess I end up at around 2.6kg when ready to fly.
Jan 23, 2013, 12:45 PM
RTFM
octane81's Avatar
Quote:
Originally Posted by rclab1
the 800kv motor is more then enough power for mine
Are you using the 830kv Tmotor? what size prop?
Jan 23, 2013, 04:44 PM
USA: LakeGeorge, New York
octane81,

I use these two motors with 12x8 APCe, 4s-5700mah Lipo (80amp ESC).

http://epbuddy.com/index.php?main_pa...roducts_id=187
and

http://www.hobbypartz.com/96m603-big...826-870kv.html


both are unlimited vertical and can go on forever!!!!!
Jan 23, 2013, 06:32 PM
hey whats burning?
metalbender4by's Avatar
Quote:
Originally Posted by octane81
Just put mine on the scale , and it weights 2.4kg (no idea what thats in lbs and ozes) with 10.000mAh 4S.
I still need to add OSD, vTX and a small video battery.
Guess I end up at around 2.6kg when ready to fly.
That's about 5lb's 3oz and 5lb's 7oz.
Jan 23, 2013, 08:30 PM
Registered User
Issus's Avatar
I have two 5800mAh 4S batteries with different C ratings and different labels (one zippy compact, one zippy flightmax). Can I use these in parallel together safely for powering my skyhunter?
Jan 23, 2013, 08:37 PM
Registered User
Quote:
Originally Posted by Daemon
In a 12, the next step up is a 12x8, but at 900kv on 4S you're going to over amp it. I'd
try an 11x7. ecalc says 3.2Kg of static thrust and 78mph pitch speed.

ian
Thanks Ian
Ill try the 11x7 pusher
Jan 23, 2013, 08:43 PM
Registered User
Daemon's Avatar
With electrics pusher/puller designation is irrelevant.
Jan 23, 2013, 09:00 PM
Registered User
Thanks
Jan 23, 2013, 09:11 PM
Never fly an A model anything!
jayb1rdz's Avatar
Quote:
Originally Posted by CambriaHobby
Thanks Ian
Ill try the 11x7 pusher
E-Calc will say that a lot of the set-ups you see with FPV are over amping the motor as it makes the determination on the assumption that the motor will be operating at or near WOT. You will also see the flight times (and mixed flight times) are also of much shorter durations than usual FPV missions.

Most of us cruise at a fraction of the maximum operating capabilities of the motor so something what is marginal on E-calc might actually be in the sweet spot for efficiency
Jan 23, 2013, 09:29 PM
Registered User
Daemon's Avatar
While it is true that most don't run at full throttle all the time, I've seen several ESCs
literally in flames due to being over amped after only moderate length runs at full
throttle. That and a few cooked motors.
The numbers for 4S 900Kv on a 12x8 prop are really over the top.

ian
Jan 23, 2013, 09:46 PM
If it's to be, it's up to me.
subsonic's Avatar
Quote:
Originally Posted by Issus
I have two 5800mAh 4S batteries with different C ratings and different labels (one zippy compact, one zippy flightmax). Can I use these in parallel together safely for powering my skyhunter?
As long as you're not getting close to the C rating limit of either battery, they don't need to be perfectly matched. Use what you have I say.
Jan 23, 2013, 09:55 PM
Watts up ?
OzparkPilot's Avatar
Quote:
Originally Posted by subsonic
As long as you're not getting close to the C rating limit of either battery, they don't need to be perfectly matched. Use what you have I say.
. Actually, in series I would say its essential , in parallel, not as important.


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