eCalc xcopterCalc settings for IRIS and IRIS+

eCalc xcopterCalc is a great online Multicoper Calculator, which supports you in choosing an adequate motor setup – along with propellers and ESC – for your electric RC Multicopter.
Even though both IRIS and IRIS+ come as an Ready-To-Fly model, it is a good idea to make regular use of eCalc xcopterCalc. This would e.g. be the case for:

  • Determine what effect additional weight will have on your quadcopter’s hover throttle (lift performance) and flight time.
  • What will happen if you change the propeller against another model.
  • When flying at different flying fields with varying altitude and/or air temperature.

With all these questions eCalc xcopterCalc can help you.
But one of the challenges is to find the correct component data for using eCalc with your specific quadcopter. Therefore here the data for the 3DR IRIS and IRIS+.

3DR IRIS

  • General
    • Motor Cooling: Poor
    • # of Rotors: 4
    • Model Weight: 1692g (incl. Drive)
  • Battery Cell
    • Type: custom – normal
    • Configuration: 3S1P
    • Cell Capacity: 3600 mAh
    • Total Capacity: 3600 mAh
    • Resistance: 0.0068 Ohm
    • Voltage: 3.7V
  • Controller
    • Type: Max 20A
  • Motor
    • Manufacturer: RCTimer
    • Type: A2830-12 (850kV)
  • Propeller
    • Type: APC SlowFly SF
    • Diameter: 10
    • Pitch: 4.7
    • # Blades: 2

You can use this direct link to xcopterCalc with the filled in values (See Figure 1).

Figure 1: xCopterCalc settings for IRIS

Figure 1: xCopterCalc settings for IRIS

3DR IRIS+

  • General
    • Motor Cooling: Poor
    • # of Rotors: 4
    • Model Weight: 1580g (incl. Drive)
  • Battery Cell
    • Type: custom – normal
    • Configuration: 3S1P
    • Cell Capacity: 5200 mAh
    • Total Capacity: 5200 mAh
    • Resistance: 0.0068 Ohm
    • Voltage: 3.7V
  • Controller
    • Type: Max 20A
  • Motor
    • Manufacturer: Tiger Motor
    • Type: Air Gear 350 (920)
    • KV: 920 rpm/V
    • no-load current: 0.5A @ 10V
    • Limit: 230W
    • Resistance: 0.132 Ohm
    • #mag. Poles: 14
  • Propeller
    • Type: custom
    • Diameter: 9.5
    • Pitch: 4.5
    • # Blades: 2
    • PConst: 1.00

You can use this direct link to xcopterCalc with the filled in values (See Figure 2).

Figure 2: xCopterCalc settings for IRIS+

These are the settings that I have been using very successfully. Calculated results usually match tested results quite well.

 

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8 comments on “eCalc xcopterCalc settings for IRIS and IRIS+
  1. hotelzululima says:

    links to filled in ecalc are broken 🙁

    • chriselsen says:

      Thanks for letting me know. Fixed the second link. But while testing it appears that the actual values only load when you are logged in to eCalc.

  2. Martin Ginkel says:

    The motors for Iris+ are actually
    Tiger Motors Air Gear 350, which can be selected directly from the menu (as of 01/2015).

    The props are still not in (would be same label, as they are sold as package). Would be interesting to know some proper PConst…

    • Christian Elsen says:

      Thanks for the update. I updated the post above with the new data.
      I agree that knowing the PConst for the propellers would be great. It would be possible to determine them by gathering test data after “calibrating” your test data from an IRIS+ with a known propeller – e.g. the APC SlowFly.

  3. hotel zulu lima says:

    Really cool.. the Graupner 10×6 folding props(which will give me considerable more room when packed in a pelican m2720 case also will yield a 49% throttle at hover even better than the stock 10×47 non folders(and folders reputed to decrease injury/damage from blade strikes etc)
    and ALL fits in the model without driving one part or another to extremes 🙂 time to order.. 🙂

    hotel zulu lima

  4. hotel zulu lima says:

    the infinity hobby site is selling phantom 3 bladed folders for 6mm motor shafts.. IF i can locate carbon blades or other at 10×6 that fit this assembly the throttle @ hover goes to 39% with a hover flight time of 14.8 minutes…

    opinions?
    model is still within specs
    hzl

  5. hotel zulu lima says:

    just reran the calc with the triple STO 9443 blades on IRIS+ and getting a VERY acceptable 53% throttle on the calc
    so ordering those immediately for the savings in transport space.
    I wrote http://www.standard-tec.com/ directly to ask about the availability of 10×6 blades for their 3 prop assembly and will report back here when complete …

    hzl

  6. david ringler says:

    I broke factory trans and I want to setup my frsky taranis plus tx for the iris! can anyone email me with help of setting up the taranis plus to work for my iris ? any and all help would be greatly appreciated!! happy flying