Power systems & FDR - discussion

[TomC]

For interest same setup as above with temp recorder on ESC and servo current recorder comparing 515 vs 550 blades (Rotortech vs generic CFs - very like SABs) - limited flight to 5:30 on timer. Also included 85% on ESC for the 550s which gave more realistic handling.

John,

Why is your power lower at 85% esc than at 70% esc w/550's? Or did you mean 65% esc instead of 85%? Maybe I'm missing something Mate.

Also, which setup did you like best? Thanks.

Cheers,
Tom C

[Mercuriell]

Thought we could have a separate discussion on power systems to keep the original thread clean with data


John,

Why is your power lower at 85% esc than at 70% esc w/550's? Or did you mean 65% esc instead of 85%? Maybe I'm missing something Mate.

Also, which setup did you like best? Thanks.

Cheers,
Tom C

Hi Tom- yeah strange numbers - I put it down to the ESC being more efficient and losing less heat at the higher setting - the numbers are correct but I guess I ought to repeat the measurments to make sure !! I liked the 5156 blades on 85% best cos of the lightening cyclic and duration - also a different feel from the L600 = John

[Flybar-less]

The 599, 8S long, Neu 1910H/1Y, 17/212, 600 Radix, 9 and 13 degees, is a great combo. Not as fast or as strong as my 10S 600, but a lot more power then a 6S. It will bog a little in sustained tic-tocs, or my favorite, full collective climb out with full cyclic after a few seconds. It will spin during the flip due to loss of headspeed, whereas the 10S 600 does not flinch.

[MrMel]

If your RPM guage is correct, it was almost no change in RPM between 70% and 85%.... are your endpoints correct in the radio? else it could be that your 70% is actually 99% and your 85% = 100% and that could be the difference needed.

(almost no more RPM, but open throttle = more efficient)

edit: Btw, the avg power is slightly higher on the 85%...peaks are mostly always a false reading

[Mercuriell]

If your RPM guage is correct, it was almost no change in RPM between 70% and 85%.... are your endpoints correct in the radio? else it could be that your 70% is actually 99% and your 85% = 100% and that could be the difference needed.

(almost no more RPM, but open throttle = more efficient)

edit: Btw, the avg power is slightly higher on the 85%...peaks are mostly always a false reading

Interesting points - how does the Jazz define it's end points - in heli mode do you have to start it up in fixed endpojnt mode first to define voltage range - there were different packs in the two graphs - maybe the startup voltage was different leading to the rpm difference mentioned in other threads (http://www.helifreak.com/showthread.php?p=478553#post478553)

[MrMel]

All jazz except PJ: Watch the led, when it comes on its 100%, on Spektrum radios its around 81-82 on ATV.

on PJ in APM: You need to goto 100% and then backdown each startup
on PJ in manual mode: You need to use the progcard to learn the PJ where your radio endpoints are.

[Team-MAYHEM]

Should the throttle endpoints be changed? If so, how? So should you set your set your throttle endpoints to 50 then slowly increase them both ways until you achieve a red light on the jazz?

Just curious, as I've never bothered setting those endpoints.

[Flybar-less]

For a 600 swinging 600s-620s, my rec is the Neu 1912H/1Y w/13T and a CC 85HV. The 1915/1Y is best suited for 700s. Many of us have smoked the PJ running with Neu motors. The Jazz 55 can't take high ambient temps and high current.. The CC Gov works as well as the Kontroniks, you just have to set it up right. The CC reads motor rpm and the Kontroniks don't, leading to some headspeed varition with ambient temp differences, like 300 rpm. The best ESC I have used is the Shulze, which also reads rpm, but it doesn't work well with high KV motors like the Neu. The Orbit 30-12 HE is a great motor that works well with the Shulze 32-80K or Kontroniks on a 16T or 17T.