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Take some CA glue on a cocktail stick, wipe most of it off then poke it in the hole in the prop and wipe it around a bit. You only want the slightest smear of glue in there. Let it dry and it should be a tighter fit on the prop shaft.
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I think not all have 3 gyros+3 accelerometer, i.e. 6 axis.
6 axis - Walkera Ladybird V1 UDI U816 Mini Pet SH-6043 3 axis - Walkera Ladybird V2 WLToys V929 my hybrid LB/U816/V929 board unknown - WLToys V939 Quote:
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Ladybird v2 ... actually it is just a speculation that has only 3 gyros and no accelerometer ... maybe they just remove 2 gyros ... and 1 accelerometer ... at the end I think all is need is a accelerometer for X-Y ... and a gyro around Z axis ... Tchuss e_lm_70 |
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Tchuss e_lm_70 ps: On ebay I can get an accelerometer board, for less then 5$ shipped ... http://www.ebay.com/itm/Arduino-MMA7...-/180943870262 |
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I ask honestly, as V929 doesn't have it, yet it hovers and flies goooood |
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A gyro sense a rotation ... so it is used for stabilize that it is not rotating ... but the gyro know only if it is rotating ... it has no idea if has rotare 90deg or 120deg or 10deg ... it just a sensor that say ... I'm rotating right now at X deg per seconds ... An accelerometer ... can know if the sensor is 90deg or 20deg, or whatever degrees ... it just need to send the X and Y acceleration ... if these are both 0 ... then it is flat ... if X is 9.8g ... and Y=0 ... then the sensor is perpendicular to the horrizon, in the X axis .. etc So ... why not ... a pure quad based on accelerometer is possible But 1 gyro is needed ... the one around the Z axis ... else there is no Yaw control-stabilization possible Tchuss e_lm_70 ps: Using the mem- effect ... so story the gyro reading ... also called head holding in the helicopter gyro ... it is in theory possible to assume in which orientation is the sensor ... it also require that at start up the sensor is on flat position ... but .... the mem effect will accumulate some error over the time ... and it is very sensible from vibrations ... so .... this holding is not really working fine ... if not for hold a position for few seconds with some error accepted ... |
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Actually I think it is even more accurate then not using gyro. Tchuss e_lm_70 |
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I also know of people flying helicopter without gyro ... actually some cheap toy don't have it Yes, if everything is tuned perfectly, or it is mega stable ... a human input can compensate the absence of electronic support. Still ... gyro in the quad and tricopter are used for historical reasons ... since pioneers did use mixer and gyros ... and no control board. ... so accelerometer has been appeared later on the control board ... Anyhow ... it is possible that as we speak there are already chip with 3 gyro and 3 accelerometer integrated in a single chip with i2c interface that push automatically all the 6 value in one shot .. making more easy the programming stuffs ... at the end this chip got common since from the time they have been added on a mobile phone, thats why they are so cheap now. Tchuss e_lm_70 |
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This test flight indoors shows the v939 looks a lot easier to hover than my U816.
Harder to tell on this one, but the pirouettes look clean, at least:
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