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Old Sep 13, 2012, 10:34 AM
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4S 8" props vs 3S 10" props Performance & Flight Times

I fly a DJI Naza F450 with 10" props and 4400mah 45C lipos.

What's the difference in performance and flight times when switching from 3S 10" props to 4S 8" props? Will 8" props have less thrust, but be compensated by the extra volts in power?
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Old Sep 13, 2012, 11:33 AM
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Orlando, FL
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Add me to the list. I wanna find out as well. Plus I also want to know the difference in handling.
I heard that higher volt(rpm) and smaller prop makes the handling easier. It didn't seem very logical to me.

I hope someone shares...
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Old Sep 13, 2012, 01:27 PM
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Old Sep 13, 2012, 02:15 PM
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Well to give some reference a 1kg quad with 10" props on 3s 4500ma will hover for 20.64 min @ 69% throttle and same quad with 8" props on 4s 4500ma will hover 20.92 min @ 77% throttle. Calculated using ecalc. I would prefer the larger props.
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Old Sep 13, 2012, 02:27 PM
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I've used 10" and 9" Gemfan props on both an F450 and F550. To me there's no difference in flight times, I think a 2200mah 4S Lipo gives roughly the same flight time as a 2200mah 3S. Maybe even a tiny bit more, you need less amps to hover. Do not use the stock 10" props on 4S, the motors will get very arm. 10" Graupnrs and CF Gemfans are alright though, it'll have heaps of power and won't overheat.
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Old Sep 13, 2012, 05:06 PM
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I fly with 4S 4000-4500 batts on 10" props in manual mode flight times are 4-5 minutes... i'll run my motors at 150Fand after 50+ packs the motors are fine.

3S + 10" props = lame..... 4S + 8" props = lamer.

I can lie but the video can't...

DJI F450 Shellpark (4 min 28 sec)
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Old Sep 13, 2012, 05:52 PM
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Ecalc is great for guesstimations.

More and more it is proving unreliable for accurate predictions for multirotor use.
Its better to get your own experience and until you get that, the opinion of relatively trustworthy personal who have used certain motor and prop combinations.

There is something wrong with getting 5 minute flights on a 4S 4500mAh on a DJI 450.
Oversized motors? Weight? Prop selection? What is it?
Your times should be above 10 minutes.
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Old Sep 13, 2012, 06:24 PM
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Quote:
Originally Posted by Noob Mike View Post
Ecalc is great for guesstimations.

More and more it is proving unreliable for accurate predictions for multirotor use.
Its better to get your own experience and until you get that, the opinion of relatively trustworthy personal who have used certain motor and prop combinations.

There is something wrong with getting 5 minute flights on a 4S 4500mAh on a DJI 450.
Oversized motors? Weight? Prop selection? What is it?
Your times should be above 10 minutes.

I take it you've never flown in manual mode... sure in atti mode i can get 7-10 minutes of yawnola.
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Old Sep 13, 2012, 06:53 PM
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I get noticeably more flight time with 10" props compared to the 8" ones.
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Old Sep 13, 2012, 07:08 PM
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United States, VA, Virginia Beach
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Quote:
Originally Posted by Torque66 View Post
I fly with 4S 4000-4500 batts on 10" props in manual mode flight times are 4-5 minutes... i'll run my motors at 150Fand after 50+ packs the motors are fine.

3S + 10" props = lame..... 4S + 8" props = lamer.

I can lie but the video can't...

http://youtu.be/oVv1Rl3eqTM
How many Amps are you pulling?
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Old Sep 16, 2012, 10:06 AM
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Hochiminh City
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I believe it is over weight for this size with 4500mah.
I fly F450 , 4S 1800mah on sunny angle 980Kv 8x4 props and can fly 6 minutes
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Old Sep 16, 2012, 06:43 PM
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United States, FL, Melbourne
Joined Mar 2012
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wow

Quote:
Originally Posted by Noob Mike View Post
Ecalc is great for guesstimations.

More and more it is proving unreliable for accurate predictions for multirotor use.
Its better to get your own experience and until you get that, the opinion of relatively trustworthy personal who have used certain motor and prop combinations.

There is something wrong with getting 5 minute flights on a 4S 4500mAh on a DJI 450.
Oversized motors? Weight? Prop selection? What is it?
Your times should be above 10 minutes.
Dude, did you see him fly? He's a maniac!
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Old Sep 16, 2012, 07:50 PM
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Brazil, São Paulo, São José dos Campos
Joined Aug 2012
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Crius Multiwii SE with GPS Ublox

I fly with 3S 2200mAh battery on 8"x4.5 props...about 6-7 minutes...sometimes using GPS PH and RTH on this video bellow.

Crius Multiwii SE with GPS Ublox - PH and RTH with camera on board. (7 min 0 sec)
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