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  • #1

    550E FB headspeed

    Quick question if I may...
    I'm just starting to fly a 550 E FB with stock Align motor, ESC, Align 550 blades, 6S5000 LiPos.
    Just wondering what is a good headspeed? I just measured it at 1800 - 1900 at hover.
    The reason I ask is that although it flies lovely and smooth & stable, it does seem to lack 'punch'.
    Punching full collective from hover, it doesn't exactly scream skywards - more sort of floats off gently! - e.g. from hover, full collective for half a second or so, and it goes up maybe 10 feet.
    Measured collective is plus / minus ten degrees.
    It just seems very much slower than my 500 in the climb. Is this to be expected?
    Maybe I just got used to the 500?
    Any wisdom very welcome!
    Trev
    Lots of different things that fly
    And happy to have FOUR shiny EGS
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  • #2
    That does not sound right. That head speed is too low for a start i reckon. I use 523 Edge on mine. That will make a big difference. I suppose using bigger blades will drop the head speed. You may have to use a different pinion to get the setup right i think. Im no expert though
    Stainburn Helicopter Club
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    • #3
      Is ten degrees pitch not a little low?

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      • #4
        I run around 2500 hs and +/- 13degrees pitch. And it's a blast.
        Gaui x7 lush
        Gobbalin 500
        Trex700 new dfc n OS 105/vbar love it
        ALL ON SPEKKY GEAR
        Blade 130x2
        nano

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        • #5
          Thanks guys.
          I could try some shorter blades, although I believe the 550mm Aligns are the standard?
          I'm running 75% throttle , and I'm sure it wouldn't get anywhere near to 2500 RPM even at 100% throttle. 16 tooth pinion on it.
          Everything is free-running and smooth.
          Maybe motor has gone weak, or ESC is fooked? Do I need to 'teach' this ESC what 100% throttle is e.g. by powering up at 100% or something, to sort of calibrate it?
          Thanks!
          Trev
          Lots of different things that fly
          And happy to have FOUR shiny EGS

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          • #6
            Standard 550 blades are 520mm
            Very proud to be an Align-Trex.co.uk Team Pilot!

            SAB            Goblin 700 / V-Bar Blueline 5.3 Pro
            Trex 600 EFL Pro / V-Bar Silverline 5.3 Pro
            Trex 500 FBL /             Beast X
            Futaba 8FG

            Proud Owner of 2 EGS Awards

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            • #7
              Try 83% and 12deg pitch. Should sort things out.
              http://www.thurrockmfc.co.uk/

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              • #8
                The 550 ships with 520 blades mate. 10 degrees pitch is fine it should still have some grunt. It will still pull pretty good with 10 deg and 520 blades. If you want to run the 550 blades you will need to change the pinion

                Your motor and esc will be fine.... it is those blades that are the issue. you need to change your set up to run them.... or go back to stock

                Using more pitch with your current setup will cause the motor to bog horrendously i think.
                Last edited by SaneAdam; 13-05-2012, 04:02 PM.
                Stainburn Helicopter Club
                Sab Goblin 700 Competition Carbon
                Sab Goblin Black Nitro 650
                MSH Protos 380


                Vbar Control

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                • #9
                  if using 550 blades use the smaller pinion supplied not the bigger one as stated in manual. is your esc set on quick response?
                  Santander Factory Team

                  Proud wearer of 5 x EGS

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                  • #10
                    Thanks to all for this, really helpful!
                    Def is motor bogging down on long blades - I tried going up from 75% to 85% and 90% and no increase in head RPM. Bogged I think.
                    Interestingly, 1900 RPM looks about right - am I right in thinking 1220KV x 22Volts x 16 tooth pinion / 170 tooth main gear = 2526 RPM. So 75% throttle of 2526 = 1894 RPM or thereabouts?
                    Anyway, I'll get some 520mm blades tomorrow (hopefully), and see how it goes.
                    Cheers all for pointing me in the right direction.
                    Taa

                    Trev
                    Trev
                    Lots of different things that fly
                    And happy to have FOUR shiny EGS

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