Maximum RPM's on Ammo Motors?

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  • Meniscus
    Refuse the box exists!
    • Jul 2008
    • 3225
    #1

    Maximum RPM's on Ammo Motors?

    Does anyone know what the maximum RPM's are on Ammo motors? I haven't been able to locate those specs anywhere. I've been looking at some of the smaller diameter motors, long versions.

    I appreciate the help!
    IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"
    MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil
    Tags: None
    • Diegoboy
      Administrator
      • Mar 2007
      • 7244
      #2
      Your "little" Ammo motor 26-45-2700 have a set of specs that are as follows:

      SPECS: Motor Diameter: 1.1" (28mm)
      Motor Length: 1.77" (45mm)
      Motor Shaft Diameter: .125" (3.175mm)
      Motor Shaft Length: .6" (15.25mm)
      Wire Length: 2" (52mm)
      Mounting Hole Diameter: .09" (2.5mm)
      Between Mounting Holes: .51" (13mm)
      Weight: 4.6oz (133g)
      RPM/V (kV): 2700kV
      Resistance: .37ohms
      Maximum Constant Watts: 518W
      Maximum Surge Watts: 925W
      Maximum operating temperature: N/A
      Maximum RPM: N/A
      Magnet: Neodymium
      Input Voltage: 7.4V-18.5V
      No Load Current: 1.5A
      Max Constant Current: 28A
      Max Surge Current: 50A
      Prop Range: 8x6E-14x7E
      "A quick temper will make a fool of you soon enough."
      . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bruce Lee. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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        • Meniscus
          Refuse the box exists!
          • Jul 2008
          • 3225
          #3
          Thanks for the info Diego, but I'm looking at a different one. In any case, I don't see maximum RPM, only input voltage.

          Looking at the 24-45-3790
          IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"
          MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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            • Diegoboy
              Administrator
              • Mar 2007
              • 7244
              #4
              Max input voltage is 11.1V x 3790 = 42,069RPM is a MFG safe speed. so I'd say the max might be close to that number?
              "A quick temper will make a fool of you soon enough."
              . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bruce Lee. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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                • Meniscus
                  Refuse the box exists!
                  • Jul 2008
                  • 3225
                  #5
                  That's what I'm hoping. ...Now to fit a larger ESC in the Renegade, LOL!

                  ....or maybe it's for something else....

                  IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"
                  MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

                    Comment

                    • Brushless55
                      Creator
                      • Oct 2008
                      • 9488
                      #6
                      Most brushless motors have a max rpm of about 60k
                      .NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s

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                        • sailr
                          Fast Electric Addict!
                          • Nov 2007
                          • 6927
                          #7
                          differs between 2 pole, 4 pole, 6 pole motors also.
                          Mini Cat Racing USA
                          www.minicatracingusa.com

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                            • Fluid
                              Fast and Furious
                              • Apr 2007
                              • 8012
                              #8
                              Typically motor rpm is limited by the quality of the bearings, then by the mass of the rotor/magnets (or how well they are glued to the rotor). By tying the magnets to the rotor with kevlar line this limit can be raised.

                              Examples: the large Lehner 3000 series 2-pole motors have an rpm limit of 50,000 rpm. The similar-sized Neus 2200 motors are limited to 40,000 rpm. The smaller 1500 series Neus are limited to 60,000 rpm. All those limits are regardless of the Kv or voltage.

                              My question to the OP - how will you know the rpm in use? Will you have a data logger? Knowing the Kv is much more useful than knowing the max rpm. Except for SAW applications you will never want to run a motor at 40,000 rpm or higher. Most props don't get much bite at that blade speed and are not very efficient.



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