anybody need datalogger data?

[Jesse J]

I just got into my datalogger and am loving it! I know there are those out there (ReddyWatts etc.) who have asked for this data along with details of the set up. Lemme know if you want the raw datalogger files and I can provide them.

I was blown away with how spikey these graphs are! check out this one from my DeltaForce 26 mono running the BJ motor/esc, .15 cable drive, 5S 4900 Rhino packs and a GR 42x55 prop. If I need to add weight too, I can. Check this out! Note, it is comparing Watts (max 1600) on the left scale and pink color to Amp draw (80 amps max) on the right scale and blue. Pretty cool that the 45 amp esc handled this and didn't even get over 100 F!!!

This data helped me know that over the two minutes screaming around the pond hitting 37 mph, I burned 1100 ma for a running average of 500 ma per minute. So my 4900 mah packs will allow me to run for 7-8 minutes for a safe discharge of 75%. This logger also monitors pack voltage and other things I am to discover soon.

[ReddyWatts]

Amp draw (80 amps max) on the right scale and blue. Pretty cool that the 45 amp esc handled this and didn't even get over 100 F!!!

Thanks for the data.

[Jesse J]

I forgot to mention those were 20 C batts.

This one is on 4S, 5000 mah 25C+ and all else same. So here, I have used 2.8 of the 3.5 available to only use 75% in 5 minutes. This set up (lower voltage, but higher C rating) ends up lasting just over 6 minutes. This time my max speed was 30 mph. It weighed in at 3lb 9.5 oz before this run. Note, left axis is Watts and Amperage (same scale) and right axis is cumulative mah usage.

I have another graph for my 22" balsa Atlas (in my avatar), 8L, CC Hydra, wire drive, 3S 4900 mah, 20C, and 635 prop. I can post if interested. It was just a minute, but maxed out at 120 amp spikes just before it flipped and I had to head home.

[ozzie-crawl]

iam no expert jesse j but some thing seems of there, i run a df 26 copy hull using a ammo 2300 on 4s with a blackjack esc and a x440 prop. i only pull 45 amps max and have a top speed of 45mph, your setup on 5s should be around the same rpm as mine on 4s

[Jesse J]

Thanks for the input, the diff could be the motor. it is the 1500 kv BJ motor, or possibly more importantly, as I was pondering each time I woke up last night, the prop is a monster! not so much size, but pitch! if it is 55 mm pitch that is nearly 2.5" whereas yours is 1.4" I have had high amp issues with this prop. I will be trying other props and see what we can do for amperage draw.

I will be trying my 440, 640, 442 and 642 and 40mm Prather S215 (which still has 2.5" pitch) and others.

[DISAR]

As far as I know the Octura 440 has a pitch of 1.4*40= 56mm, similarly the 442 (1.4*42=58.8) the 642 has 1.6*42=67.2 and so on...
The prather 215 has 1.6" diam. (40.6mm) and 2.5" pitch, so if you divide them 2.5/1.6=1.6 so it is like an Octura 640. In the Prather props they state the total pitch where in Octuras they state the type of pitch (1.4,1.5,1.6) and you multiply that by the diameter to get the total pitch.
The Grimracer is 42mm diam, 55mm pitch hence 55/42 = 1.3, less than the 1.4 Octura series (X4.., 14..)

[Jesse J]

I don't know, that GR 4255 is REALLY high pitch looking. I will compare again tonight, but not sure if it is less that 1.4... I need to look at the charts again.

[Jesse J]

Dang, looks like you are right. Hmm. ok, well why do they look so different?

[DISAR]

I have this prop and octuras and the grim4255 looks different, I do not why, but it is not a high pitched prop., it is low pitched. I do not want to mislead you and maybe someone else may come in to say his opinion. I wrote just what I know for these props.

[ozzie-crawl]

i maybe wrong but the 80amp draw seems a bit high, have ran blackjack motors on 6s with bigger props and only pulled 80 amps

[ozzie-crawl]

here is a shot of my cat running a 7xl on 4s x440 prop (ignore the rpm spike) will try to find my mono data

[DISAR]

Jesse, if you have another prop. such as X442 or Graupner 2317.42 try these ones and check the amps.
I had Feigao 9XL-4s-45mm prop. in 36" boat - 80-90 Amps.
I am not an expert as well.

[ozzie-crawl]

yea i agree with disar try another prop and see what happens i notice you have a s215. on mine that prop dropped my speed a little but amp draw was still only about 45 amps, you also have a x642 here is my data with a x642 detounged,

[Jesse J]

I just spent an hour b/s ing my 642. Have already 640 ready and looks like a nice day, might get some runs between solving ArcMap problems. May have some CF props to try too.

I haven't gathered the courage to dtongue a prop yet, looks like it may be near on the horizon.

Thanks guys for input, man this hobby has to end! always more territory to explore.

[Jesse J]

mean machine 29

Mean Machine this time. 9XL, .15 flex drive Hydra 120 ESC set up. Today ran 4S, 4900 mah, 20C Rhino packs and spun an X445 (freshly b/s this morning). temps were 110F for motor and ESC.

Here is data until I melted one of my not-so-good soldering jobs on the motor's bullet. GPS didn't record, but I would say at least 40mph - will update when I get my bullet soldered. Anyway, here is more data: