dan c 1 Posted January 20, 2014 Author Share Posted January 20, 2014 My esc is 45a. Should be man enough. The first time I crashed down, the canopy came away and decided to make friends with the prop. Fluffed it up a bit. Which is why it's probably out of balance ?? Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 20, 2014 Author Share Posted January 20, 2014 Also., you know the high pitch noise these motors make - Is that common for all motors that fit in such size planes? Quote Link to comment Share on other sites More sharing options...
Pete B Posted January 20, 2014 Share Posted January 20, 2014 Yes, the prop is almost certainly out of balance, although I've seen far worse shake (on my vids!) than your video. The noise is a function of the small prop and high revs - the Bixler is by far the noisiest model I fly....which is one reason why I climb and glide Pete Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted January 21, 2014 Share Posted January 21, 2014 dan On you video you can tell the prop is out of balance before you even launch it! If you listen as it speeds up it goes through a very pronounced vibration period normally as a result of the natural frequency of the motor mounting matching the frequency of the prop vibration. At higher rpm it appears to smooth out somewhat but if at some point the higher frequency matches the resonant frequency of your Mobius mount then you get picture 'rippling'. If you are going to do much 'in plane' videoing get a good prop balancer! Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 21, 2014 Author Share Posted January 21, 2014 Whats best to make a simple prop balancer to try it ? Ive been looking about the house., cant find much Ive ordere a new prop but until it arrives , be interesting to see how this one is . Quote Link to comment Share on other sites More sharing options...
Pete B Posted January 21, 2014 Share Posted January 21, 2014 In the absence of a pukka balancer, this would do at a pinch: I managed with one of these for quite a while - just used the rims of a pair of whisky tumblers to balance it on. I now have a magnetic prop balancer - similar idea to the simple one - but it's no longer listed at HK. Pete Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 22, 2014 Author Share Posted January 22, 2014 Ive tried to do the above balancing . I cant see that mine is out of balance. No matter what I do I can not get it to drop one side or the other. Maybe its friction but it seams to stay level. Doesnt help that where the prop wants to sit on the rod is at one side so it just wants to lean forward if you know what I mean. These spacer things, and the hole does'nt go right through from one side to the other. <<<That does not make much sense! Mobious is after all , bolted to the top of the fuse no more that 5 or 6 inches away from the motor. Maybe its just to close to it? I have bought a new prop anyway to try . Edited By dan c 1 on 22/01/2014 14:38:32 Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 23, 2014 Author Share Posted January 23, 2014 My prop adapter is slightly bent. I can see when the motor is running slowly with out prop on. I think the motor shaft is straight. Is there anywhere in the UK you can buy such things without daft postage charges? Any good shops for recommendation? Edited By dan c 1 on 23/01/2014 14:14:36 Quote Link to comment Share on other sites More sharing options...
Rob43 Posted January 23, 2014 Share Posted January 23, 2014 Dan,I expect hobbyking would send that on their cheapest posting from the uk warehouse. I think its about 2 quid. Quote Link to comment Share on other sites More sharing options...
Rob43 Posted January 23, 2014 Share Posted January 23, 2014 Just had a quick look. A 3mm collet adaptor is about ?4 ish including the posting. You can always make up the postage weight with another item or so. Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 23, 2014 Author Share Posted January 23, 2014 So can I use a 3mm one? Doesnt have to be 2.4mm or the exact size of the shaft? Quote Link to comment Share on other sites More sharing options...
Rob43 Posted January 23, 2014 Share Posted January 23, 2014 If that is the shaft size then you will have to get one the same size. 3mm will be too big if the shaft measures 2.4 mm Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 23, 2014 Author Share Posted January 23, 2014 It appears a fair few people have these bent prop adapters from hobbyking. Must be causing the jelly picture on the mobius. I have asked for a few replacements under warranty! Hard to find 2.4mm adapters!! Quote Link to comment Share on other sites More sharing options...
Pete B Posted January 23, 2014 Share Posted January 23, 2014 I'd normally suggest Giantshark as a source of prop adaptors but since the change of name they are a shadow of their former selves - the stock situation is inevitably utterly abysmal and navigating around the website is a nonsense..... That 2.4mm shaft seems to be distinctly non-standard, although the adaptor is available. 2.3mm is the nearest stock item but it would seem that it won't fit the Bixler motor. TBH, I didn't see the vibration on the video as being particularly bad. If you do want to sort it, it might be worth changing the motor for a similar spec with a 3mm shaft - it'll be sturdier all round. With prop adaptors, you really need to get the right size - close isn't good enough. The difference between 3mm and 3.17mm means that neither will fit the other.... Pete Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted January 23, 2014 Author Share Posted January 23, 2014 Yes, non standard ! That's my luck ! The vibration is more of a big ripple effect across the film. You can see it in HD for sure but not so much when its been uploaded. You can vaguely see it at around 40 seconds in on the web video but some of the other footage I have shows it quite bad. Doesn't look great. Ill try changing these adapters with the new prop and see if it goes first. Looks like hobbyking it is ! Edited By dan c 1 on 23/01/2014 19:54:31 Quote Link to comment Share on other sites More sharing options...
dan c 1 Posted February 19, 2014 Author Share Posted February 19, 2014 Hi pete. Hope you're well. I've had some great flights lately - Really enjoying it and the mobius. Just gets better and better does'nt it. Kind of lost sight of it up in the clouds the other day trying to get some footage - slight panic!! But found it again luckily. These things get so high eh. Anyway , I decided to by a new Tx battery the other week as my old pack in the Tx didnt seam to be lasting more than 2 outings. I charged it up last week and it just went straight to warning on the Tx. Mind you, lt is about 7 years old so its done well. I purchased a 9.9v LiFe battery from hobby king. It's currently balance charging happily away but looks like the end voltage will be 10.80 volts. Is that ok for the Futaba radio? Considering the old nicad pack was 9.6v Do you or anyone confirm it will be ok before I plug it in fully charged to the Tx? Quote Link to comment Share on other sites More sharing options...
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