Charts on Today's Electric Flying

[Crist Rigotti]

Guys,
I went flying today with Mike Scott. The purpose of flying today was to electronically log some electric flights.  We logged 3 items.
1- Battery Voltage
2- Battery Amps
3- Total MA used

The weather was 45 degrees, 3-5 mph.

Mike had his Max Bee named Maxy, and I had my Pathfinder.

Mikes plane weighed 63 ounces with the additional eLogger weight.  My Pathfinder weighed 55 ounces with my 5S 2800 TP batteries and the eLogger.  The Pathfinder with the 6S 2200 CNHL batteries and eLogger weighed 57.5 ounces.

Looking at the charts one can see each individual lap and stunt.  It also has the maximum, minimum, and average values for the 3 items we logged.

We logged 2 of Mike's flights.  1 with his 6S 2800 TP battery witch has 49 cycles on it and it is labeled Maxy Old.  The other flight was with his 6S 2800 TP battery witch has less than 10 cycles on it and is labeled Maxy New.

I logged 2 flights on my Pathfinder.  1 with my 5S 2800 TP battery with 2 cycles on it and it is labeled PF#1.  The other flight used my 6S 2200 CNHL batteries and is labeled PF#3 6S.

Let's look at Mike's flight labeled Maxy New:
at the seconds mark:
50 - takeoff roll begins
55 to 85 - Level Flight
85 to 95 - Wing Over
95 to 105 - Level Laps (these are evident between each stunt and won't be mentioned anymore)
105 to 115 - Inside Loops
115 to 145 - Inverted Flight
145 to 155 - Outside Loops
165 to 170 - Inside Square Loops
180 to 188 - Outside Square Loops
195 to 205 - Triangle
215 to 225 - Horizontal Eight
235 to 250 - Square Eight
255 to 270 - Vertical Eight
280 to 285 - Hourglass
300 to 315 - Overhead Eight
325 to 335 - Cloverleaf
345 to 355 - Unwinding Loops
355 to 385 - Level Laps

What I found interesting is that looking at my flights compared to Mike's was that his "Level" laps were very consistent and always at the bottom of the chart, while mine weren't and varied a lot higher up into the chart.

Mike's old battery on the lowest voltage reading equaled to 3.33 volts per cell, while on the new battery the lowest voltage reading was nearly 3.5 volts per cell.

On my Pathfinder on the 5S battery my lowest voltage was 3.47 volts per cell, and on the 6S battery, the lowest voltage was 3.52 volts per cell.

I can imagine looking at the charts and "digesting" the information, a lot more info can be had.

Enjoy

[Dave Rigotti]

Great stuff!

[Crist Rigotti]

One thing I noticed is looking at Maxy New, is that the "flying" voltage is from 23 volts to 21 volts, even though he is using a 6S battery when fully charged is at 25.2 volts.  Yet the whole pattern voltage was within those 21 to 23 volts.  A drop of only 2 volts while flying or only .333 volts per cell.

[Crist Rigotti]

Next time out, I'll log RPM.  This way I can see if there is any drop off near the end of the flight.

[M. Scott]

You are right about checking the rpm, from old batteries to new ones, or to be able to
check the constant rpm and what changes and drops off....maybe it will be warmer, LOL

Mike

[Ken Culbertson]

Do you guys realize how much work you are saving me!

Thanks - Ken

[Dan McEntee]

Next time out, I'll log RPM.  This way I can see if there is any drop off near the end of the flight.

     This is all well and good and stuff, but where do you put in the data for the motor exhaust to smell like cotton candy??   Remember that Crist old buddy? We haven't had a chance to bust your chops about that in a long time. I hope we can get together somewhere along the line this summer.
    Type at you later,
       Dan McEntee

[Crist Rigotti]

     This is all well and good and stuff, but where do you put in the data for the motor exhaust to smell like cotton candy??   Remember that Crist old buddy? We haven't had a chance to bust your chops about that in a long time. I hope we can get together somewhere along the line this summer.
    Type at you later,
       Dan McEntee

Hey Dan, I remember that!  It worked real well.  You can get the stuff at your local speed shop!  All different flavors too!
I was looking forward to the 50th but when it was rescheduled, I couldn't make it.  Perhaps this summer for sure.

[AMV]

Hi Crist,

This is very interesting information!  Do you by any chance have the raw data files from the flights?  If so, can you post them here as well?
Also, what timers were on the models during the flights and what were their settings (sensitivity/gain/etc.) ?

Cheers
-Andrey

[Dane Martin]

Crist, thank you for the data about the time during the flight, where a certain maneuver happened. I've been chatting up some folks on the phone and this is extremely helpful to that conversation.

[Crist Rigotti]

Hi Crist,

This is very interesting information!  Do you by any chance have the raw data files from the flights?  If so, can you post them here as well?
Also, what timers were on the models during the flights and what were their settings (sensitivity/gain/etc.) ?

Cheers
-Andrey

Andery,
Yes, I have the files.  I don't think I can post them here.  Shoot me an email.
I'm doing more testing tomorrow and I post those results with a lot more information.

[AMV]

Thanks Crist, looking forward to it!

-Andrey

[Dave Rigotti]

Crist,
What sampling rate did you use for the data?
How about a picture of the mounted eLogger for us to reference to?

[Crist Rigotti]

Crist,
What sampling rate did you use for the data?
How about a picture of the mounted eLogger for us to reference to?

The sampling rate was set at the eLoggers max at 10 times per second.

The eLogger was "inserted" between the ESC and battery connectors and tucked under the velcro battery straps.  I have no actual picture.

Call me and I can explain ALL the settings I used.

[Crist Rigotti]

I flew some more flights yesterday with the RPM sensor hooked up.

First a recap of my set up.

Pathfinder weight of 53.7 ounces without eLogger but with TP 5S 2800mah battery.
Cobra 3515/18 - 740Kv
TP 5S 2800mah battery
Igor Active Timer with a Spin 44 esc
APC 13x5.5EP prop cut down to 11.5 inches
Launch RPM is 9800 RPM on TNC tach
eLogger weighs 1.3 ounces
CNHL 6S 2200mah battery weighs an additional 1.6 ounces over the TP 5S 2800mah battery
62 .015 foot lines eye to eye
5.3 seconds lap speed
Size 9 tennis shoe

Active timer settings are:
Delay 35 secs
Flight Time 5:25
Target Throttle: 147
Min Throttle: 100
Max Throttle: 200
Calibration: 0
Sensitivity: 20

No charts will be provided.  They all basically look like the ones above.  But the key numbers will be given.  These numbers are during the actual flight.

Flight #1
Standard every day flight

AMPS - min 11.54  max 29.98  ave 20.43
Volts - min 17.58  max 19.15  ave 18.16
RPM - min 9022  max 10327  ave 9709
Throttle - min 143  max 163  ave 152.13  (on a scale from 0 to 200)  152.13 = 76% full throttle.
Total MA - 1849

Flight #2
This flight started with the OH8 then the Clover, then the 3 inside loops, and the rest of the pattern in order.  This was done for a direct comparison of the RPM of the OH8, Clover at the beginning and ending of the flight.  There was no difference.  The 5S pack experienced NO RPM drop off at the OH8 and Clover at the end of the flight.

AMPS - min 10  max 29.98  ave 20
Volts - min 17.53  max 19.28  ave 18.17
RPM - min 8928  max 10228  ave 9720
Total MA - 1835

Flight #3
Standard flight but Sensitivity set to 0

AMPS - min 12.87  max 27.81  ave 19.91
Volts - min 17.62  max 19.05  ave 18.17
RPM - min 9157  max 10155  ave 9646
Total MA - 1804

Flight #4
Standard flight but with 6S 2200mah battery.  This combo added about 3 ounces nose weight.  Sensitivity back to 20.

Amps - min 8.94  max 27.08  ave 17.59
Volts - min 21.44  max 24.19  ave 22.44
RPM - min 8537  max 11074  ave 9747
Total MA - 1591

[Ken Culbertson]

Size 9 tennis shoe

I will be using a size 11.  Will that affect any of the settings? 

It was interesting that the stats for the OH8 & Clover at the beginning were the same at the end.  That opens up practicing back end maneuvers at the front end.  Waste of time to do that with IC due to the CG shift.

Really appreciate what you are doing.  I am going to steal borrow all of it when I get back.

Ken

Ken

[Crist Rigotti]

I will be using a size 11.  Will that affect any of the settings? 

It was interesting that the stats for the OH8 & Clover at the beginning were the same at the end.  That opens up practicing back end maneuvers at the front end.  Waste of time to do that with IC due to the CG shift.

Really appreciate what you are doing.  I am going to steal borrow all of it when I get back.

Ken

Ken

Ken,
The size 11 will give more "footing"!

[Matt Piatkowski]

Hi Crist,
Did you have any problems in persuading the eLogger to work with Igor's active timer?

Have you tried to run the 30 seconds ground tests recording the current?

Have you compared the ground test current to the average pattern current?

Could you, please, send me a PM?
Thank you,
Stay Safe and Fly Safely,
Matt

[Crist Rigotti]

Hi Crist,
Did you have any problems in persuading the eLogger to work with Igor's active timer?

Have you tried to run the 30 seconds ground tests recording the current?

Have you compared the ground test current to the average pattern current?

Could you, please, send me a PM?
Thank you,
Stay Safe and Fly Safely,
Matt

No problems at all.
No 30 second ground test run.
I'll send you a PM.

[Crist Rigotti]

I just looked at the flight I made on 1.12.21.  I logged the throttle position on that flight but forgot to give you the numbers. 

The Throttle numbers are:
min 143  max 163  ave 152.13

The Throttle numbers start at 0 and go to 200.  So my average throttle was 76% of max.

I'll edit my post on the numbers above.