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Joined Dec 2010
46 Posts
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Yes you need to excercise great care with ball links.
Lengthened the one that moves when changing pitch and it now seems much better. Phone my local railway model shop - they wanted over £7 for some oil. I'm not paying that kind of money for a small syringe of oil ! Have painted the ends of one of the top and bottom rotor so I can see how they are tracking later. I'll re-read Lee's post on who to modify the tracking if the rotors are out of whack. |
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Quote:
![]() http://cgi.ebay.com.au/Singer-Sewing...item1c1792d0e0 BTW - I am still waiting on my 5888
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Zurich
Joined Apr 2006
3,167 Posts
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"how did you notice when motors were going bad? Did you observe the symptoms I am experiencing? Did the motors squeal when the motor is going bad?" >
1. lack of climbing ability, shorter flt times, finally exactly what you experienced, culminated with spinning in one direction on the ground, even with full opposite yaw-input .... and not taking off. 2. I had only one (of well over 15 motors I've so far replaced which were either defective or worn out from use) squeal, and someone wrote in that one of his squealed from the start (he returned it). "Have painted the ends of one of the top and bottom rotor so I can see how they are tracking later." > I did that at first, later found that removable small piece of clear tape on T.E. is a much easier and quicker to discover way to discover which blade needs more or less lift .... plus., moving tape towards tip shows coning angle need increasing on that blade rather than more pitch (you can safely twist in more/less pitch if you remove main blade bolt first, else it'll strip!). a good trick to distinguish the upper blades is to remember which blade is closer to the link, and to swing one of the lower blades fwd and put a small stripe on the innermost part of the blade: that way, one blade is "white" and the other the one with the mark, only seen when you swing the blade fwd. NOTE: getting blades tracked so that the leading edge is a single white line adds about 5% effective power .... spending a lot of time to get the white line to be razor-sharp adds more than 20% power!! (the sound will drastically change!!) Lee
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Zurich
Joined Apr 2006
3,167 Posts
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Preventing (unfortunately too common!) early 5888 motor demise
The 5888 flies/handles SO well largely because it has ca. 2x the mass (thus 2x the weight!) of similar helis. Because of this high loading the motors can thus easily become overloaded. Although I've encountered a few defective motors basically D.O.A., I have slowly but eventually found out how to generally ensure a relatively long 5888 motor life.
Besides weight, there is also imperfect voltage-regulation software! This is normally accomplished by square-wave pulsing the LIPO voltage to effectively modulate the current. The LIPO discharge curve is NOT flat, and unfortunately G:T: Model's programming allows too much higher-voltage current to flow to the motors during the first minute of flt./use. That can & will quickly overheat and wear-out the motors! Checking the motor temperature several times during the first minute of flt. via the alu cladding (which is stupidly not touching the motor! [it would otherwise be a great cooling radiator![) and stopping flying so soon as the outer alu cladding reaches human body temp or so, is very, very useful!! If you get your nose close, you can actually smell the poor burning motor!! Obviously the more drastic energy-requiring maneuvers made during this 1st minute of flt. (after full charge), the more often you should check temp. Lubing, perfect tuning (incl. blade & stab bar balancing) and razor-sharp (see above post) tracked L.E. reduces power req. by ca. 20%, and really helps a lot! Lee
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