Interpreting EagleTree data
 

Trying to understand what I’m seeing…this is five flights (first flight mostly deleted.)

TP5000-10SX batteries

Tail end of first flight is battery #1 (73 cycles)
Second flight at 4 minutes is battery #3 (50 cycles)
Third flight is battery #1 (74 cycles)
Fourth flight battery #3 (51 cycles)
Fifth flight battery #6 (14 cycles)

These are mostly Master’s sequences. Would you say #3 is down or did I just get a really good pack with #1?

How are you guys using this type of data for useful purposes?

RE: Interpreting EagleTree data
 

Scott, I'd like to see more data before coming to any conclusions. If the packs consistently perform like this then I'd say #1 is really good and the others not bad. I don't like the fact that they aren't matched to each other. I'd imagine that you can really tell the difference in flight requiring different throttle settings. To me, consistency is very important.

Are you still using the Spin 99? How is the start up? Where do you set the acceleration? I've never been happy with mine.

Jim O

RE: Interpreting EagleTree data
 

Are these graphs all from the same sequence (ie you flew a Masters sequence on each of them)? When you say the 'tail end' of a flight do you mean the initial part of the graph?

It is too hard to tell anything about your batteries unless you are doing consistant sequences if you want direct comparison.

Also, have you calibrated your EagleTree yet. I would be suspicious of the 42+ volt reading on the second group in the chart.

Woodie

RE: Interpreting EagleTree data
 

I gotta agree Jim, #1 is just a stonger pack. And yes, I can tell a difference in flight. That last Immelman in Master's, it accelerates to the top. The other packs work fine, but I do find myself from time to time checking the throttle stick to see if it’s all the way up when carving the top corners.

I lost the Spin99 in July when I was shot down. Replacement is a Prestige, A60-20Sv2, CC-HV85. 10 lbs total weight with the 10SX…loving it! I never did have any issues with the Spin though. Another flyer at my club has a similar setup with the Spin and he doesn’t have any issues except that it lost his settings on him once.

Data logger was calibrated against the voltage reading from the 1010C back in the summer. I’m not sure why the logger isn’t correctly marking the flights (sessions), it used to do it just fine.

Six more flights today, here’s the last three (pack 1, 6 then 1 again.)
Let me see if I can attach a complete datafile…(change file extension back to FDR, using version 5.11)

RE: Interpreting EagleTree data
 

This is strange...today my average current was 35 amps according to the data logger but the plane was not down on power.

Is this a function of temperature (40 degrees today)?

RE: Interpreting EagleTree data
 

Scott

This seems impossible! Half the current means half the power. Are you sure the scale is correct or that some type of graphing software error didn't occur. I flew my small electrics today. The power was down some, the flight times were down dramatically.

RE: Interpreting EagleTree data
 

Looks like the data logger went south. Here's some raw data:

2130 3516 -4596 -4596 0 0 0 0 1677250
2130 3516 -4596 -4596 0 0 0 0 1677500
2130 3501 -4596 -4596 0 0 0 0 1677750

First column is voltage * 100 or 21.3v (should be 34v or better)
Second column is current * 100 or 35A which we saw in the graph.

RE: Interpreting EagleTree data
 

Upgraded firmware to 5.07, software to 6.05, recalibrated voltage and all is well with the logger. Sessions are once again correctly marked.

If nothing else, it's interesting how each battery has its own very distinct signature.

Flight 1 was on a TP3850-10SX pack. Flight 2 – 4 were on TP5000-10SX’s

Flight 2 – 78 cycle pack (seems to be the strongest pack)
Flight 3 – 55 cycles
Flight 4 – 17 cycles

RE: Interpreting EagleTree data
 

Scott

Do you have the corresponding current/power data?

RE: Interpreting EagleTree data
 

Here's more data...