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Steve Jeffery

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Posts posted by Steve Jeffery

  1. Being quite new to this hobby I have a question:-

    As I understand it an ESC is basically a device that takes DC and converts it to a variable frequency AC. Motor speed is proportional to frequency. Therefore how can there be a fixed KV for a motor. There must be some limiting factor as increasing the frequency from the ESC and the motor will go faster and KV will go up (Is there some intelligence in the ESC that senses the motor speed and carries on increasing the motor speed until it will not go any faster ?).

    Writing this has got the grey cells working and made me realize that I should have taken more notice of 3 phase motor theory when at college!!

    Steve

  2. Help please

    I have put together a Pico Stick (the one with a fusalage) and the c of g is about 15 mm further back than it should be. It could be because I have added a 3mm carbon rod to the horiz. stabaliser or maybe because I cut the prop shaft down to bring the prop closer to the cowl, I have tried adding weight to inside the cowl but it needs 0.7 oz. On such a small park flier is this not excessive? Could I move the wings back to bring the c of g back onto the mark I have on the wing or do I stick with the excess weight?

    I have put the battery and electronics as far forward as I can without cutting away foam

    Thanks in advance

  3. Hi All

    I have been watching this forum for some time and this is my first post

    Sizing servos seems to be a bit of a black art.

    From my schoolboy physics I would have thought that it was possible to calculate the torque that was required to move and hold a control surface of known dimentions in a known wind speed.(ignoring friction and assuming hinged on one edge)

    I think this would be useful info and allow people to pick an appropriate servo for the given application,

    Thanks in advance

    Steve

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