chris edwards 3 Posted July 9, 2012 Share Posted July 9, 2012 hi all i have been flying my wot 4 in the feild and had had 3 normal fine flights, BUT on the fourth flight i must have been about 1 min into the flight when i was climing out of a low flat out pass when i heard a loud grinding/squeaking noise and lost all motor response, but still had controll over all the surfaces and manadged to land no probles( one of my best dead stick landings ever ) now here is the techy part i fly of a 3s 2200mah lipo pack the standard ESC and the standard motor i have never had any problems with this model before and it has never missed a beat, i have also been flying the model off of these items for a good few months now and has never gone wrong. the problem if that i don't really want to replace the wrong part, so if anyone can decipher what the hec has gone wrong please could you inform me an i willl soon be replacing the broken part. regard chris Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted July 9, 2012 Share Posted July 9, 2012 Hi, check for loose magnets in the motor. I've seen this a couple of times just as you describe - lots of sheching then a bang and stop.# BEB Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 9, 2012 Author Share Posted July 9, 2012 thanks for the advice BEB three things 1) how do i get into the motor to check the magnets 2) when i get into the motor is it an easy fix 3) will it be cheaper just to replace motor or esc that to replace the magnets regards chris Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 9, 2012 Share Posted July 9, 2012 Does the motor spin freely? Any grating or roughness indicates a thrown magnet or duff bearing. To check.... Take the cowl off - Take the prop off - undo the four screws on the motor mount and pop your motor out. The three wires have bullet connectors that will come apart with care. On the front of the motor, you will find a grub screw and on the back a circlip. Carefully remove the circlip. (It will fly accross the room if you are not careful.) and you should be able to pull the motor apart. (It might be stiff) You can then see the magnets. Check its clean in there. Sometimes bits of magnet debris stick on the magnets. If you have a loose magnet, carefully glue it back in place with epoxy or cyano. (Dont get it in the bearings!) If you can't get the circlip back on as the motor is mounted such that under load the motor is pulled together. A standard Overlander (or similar) 3536 motor of 1000Kv is a direct swap for the WOT 4 foamy motor and about a third of the price. You might want to prop down to a 11X7 rather than the standard 11X8 as the standard spec is, if I remember rightly 900Kv. Edited By GrahamC on 09/07/2012 20:05:15 Edited By GrahamC on 09/07/2012 20:06:43 Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 9, 2012 Author Share Posted July 9, 2012 thanks for that graham the motor does spin freely and does not seem to grind or have any more resistance i will try to take the motor apart, but under closer inspection i can see that the motor mounting is slightly loose on the fuselarge im guessing then that the ESC has not broken or is causing the problem (i dought it but i not ruling it out) regard chris Edited By chris edwards 3 on 09/07/2012 20:20:40 Edited By chris edwards 3 on 09/07/2012 20:20:57 Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 9, 2012 Share Posted July 9, 2012 The motor mounts do tend to loosen up on the Wot 4 Foamy. There is not much you can do about it. If you fly from a grass field and tip the plane forward on its nose when taxying, that won't help. I ended up inserting ply wedges in to stiffen up my mount. Polyeurethane (Gorilla) glue is messy but works well and foams to fill the gap. A bit of give is not a huge problem, and you can live with it. If your motor is spinning freely without notchiness or roughness it might be the ESC. If there is noise or notchiness, I would suspect the motor. Is your shaft straight? Spin the prop by hand and look down on the spinner. It shouldn't wobble as it spins. Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 9, 2012 Author Share Posted July 9, 2012 hi i will definatly beef up the motor mounts the motor does spin freely, and the shaft if dead straight the bit that makes me doubt that its the esc is that i still get power to all the servos and can move all the surfaces. if the esc does need to be replaced what esc would i need to replace it with and where would i get one from and also where would i get another motor from if that needs replacing. regards chris Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 9, 2012 Share Posted July 9, 2012 It does sound like your motor might be OK. I think the drive section of the ESC can fail and leave the UBEC bit working. You need a 45A Brushless ESC really.. Earlier Wot4 foamys were shipped with a 40A but this is borderline and I believe they upped it to a 45. If you use an 11X7 prop rather than an 11X8 you would probably be OK. The problem is that 45's are rare and 50's cost more. Check out these or these This motor is very similar and good value. My model shop sell these motors for the same price so it might be worth asking in a local model shop. The ideal would be to try swapping a motor or ESC in order to diagnose the fault. One thing to try - try unplugging the three wires between the ESC and Motor, and then plug them in again. Could be a bad connection - sometimes causes an odd screaming sound. Edited By GrahamC on 09/07/2012 20:52:51 Edited By Steve Hargreaves - Moderator on 10/07/2012 10:22:57 Quote Link to comment Share on other sites More sharing options...
Alan Randall Posted July 9, 2012 Share Posted July 9, 2012 When I click on your motor link Graham , I get the picture of the Wot4 your son rearranged. Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 10, 2012 Share Posted July 10, 2012 Ahhh ... and its there for good now! I can't edit it! The link for the motor is here. I've used one of these on a foamy WOT4 and its fine. I always used an 11x7 prop on mine. The LMS were suggesting it when I bought mine. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted July 10, 2012 Share Posted July 10, 2012 Just altered your original link Graham to show the Thumper motor..... Keeps it all neat & tidy.... Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 14, 2012 Author Share Posted July 14, 2012 hi again have just been searching around to see if i could find another motor that is more powerfull than the standard motor, and came acros this just want to see if this would be more powefull, or will be less as im not particly sure. also if anyone can recomend a more powerfull motor please let it be nown. regard chris Quote Link to comment Share on other sites More sharing options...
Codename-John Posted July 14, 2012 Share Posted July 14, 2012 Ive used this motor with this ESC in mine for about 8 months now after the original ESC let out its smoke, used a standard prop and its never missed a beat, It takes off in a few feet and goes vertical for ages, I get between 8 and 12 mins off a 2200 3s depending on throttle use and wind conditions etc Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 14, 2012 Author Share Posted July 14, 2012 hi john i guessing then that this motor is more powerful than the standard one, which would be good because i want more speed out of the model i will also be upgrading the ESC to this, as i have fryed my current one. i also fly off of 3s 2200 and get about 7mins at near enough full chat. regards chris Quote Link to comment Share on other sites More sharing options...
Codename-John Posted July 14, 2012 Share Posted July 14, 2012 Its about the same as the original, just better quality, if anything the Kv is a bit lower, if you want something faster your better off getting a different model, wot 4`s have a thick high lift wing etc which causes more drag, being meant for more sport aerobatics its never going to be a speed demon A mate of mine has one of the skyfun models, which hes replaced the motor for a high kv inrunner and esc on and its ballistic at full throttle, yet slow it down and it will crawl along too, something like that might make a better speedy project ? Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 14, 2012 Author Share Posted July 14, 2012 hi so would a hi KV outrunner and beefed up ESC make think roket along ( well as fast as a wot will go) Like i said earlyer would this motor and ESC up the speed a bit i have also found this motor, nut on both of the motor descriptions it says that they are heli motors, would these be alright or are they completly the wrong thing. recards chris Quote Link to comment Share on other sites More sharing options...
Codename-John Posted July 14, 2012 Share Posted July 14, 2012 the ones youve linked to are a little small, the 3536 size is about the same as standard and fit perfectly, they do ones with a higher KV such as this at 1800 Quote Link to comment Share on other sites More sharing options...
Codename-John Posted July 14, 2012 Share Posted July 14, 2012 also, forgot to mention, with higher kv motors you have to use smaller props, do not try and run the higher i linked to or similar with a normal foam e prop, you`l kill it in minutes Quote Link to comment Share on other sites More sharing options...
Pete B Posted July 14, 2012 Share Posted July 14, 2012 Posted by chris edwards 3 on 14/07/2012 19:22:50: i have also found this motor, nut on both of the motor descriptions it says that they are heli motors, would these be alright or are they completly the wrong thing. Definitely to be avoided IMHO, Chris. As you have seen, this is a heli motor and you'll have all sorts of problems trying to fit it to the model. Horses for courses, go for an aero motor. I haven't got a WOT4 but as CJ says, the choice is a lower Kv with larger prop or a higher Kv, small prop. Personally, I'd go for the NTM 3536 910Kv suggested by CJ rather than higher Kv - you'll have more prop options with the lower Kv and they'll pull it through the air quickly enough......and CJ has the experience of the combo Pete Quote Link to comment Share on other sites More sharing options...
Steven Buckingham Posted July 15, 2012 Share Posted July 15, 2012 I put the NTM 3536 910KV in mine after knackering the original, it fit perfectly, had a lot more power and kept the original ESC cooler with the original prop. Just make sure that you order extra prop shafts... Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 15, 2012 Author Share Posted July 15, 2012 hi again with regards to the motors, in an early post i was suggested this motor, but i have just been looking on the overlander website and have come across this motor, which i think is more powerful. please could some tell me if this motor is more powerful or if its less. regards chris Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 15, 2012 Share Posted July 15, 2012 It's certainly going to be more powerful. The issue will be - will it fit? It may be too long to fit in the motor mount. Im not sure, and am away at present, so can't measure mine. To be honest the easiest way to get more power from a wot4 foamy is probably to change to a 4 cell battery and keep to a 3536 type motor and bigger ESC. You may need a different prop too. The other issue you need to consider is that the way the mount is hurried in the foam is adequate-ish for the standard setup, and will need attention eventually. However if you increase the power..... I'm inclined to think its the wrong airframe for much more power. If you do go down this road watch out for flutter on your control surfaces etc and of course CofG issues. Quote Link to comment Share on other sites More sharing options...
GrahamC Posted July 15, 2012 Share Posted July 15, 2012 I've had a quick look, and I wonder if this with 4 cells. and appropriate prop and ESC might be easier as iit is the same physical size and weight [near enough] to the stock motor. That said, I have to say, I wonder if you might be better off, if you are buying a new motor, battry and ESC anyway to get yourself a WOT4 ARFT E balsa version. Its less likely to disintegrate when you go wide open throttle. I've had flutter on my foamy with the stock set up, and the rudder (fortunately - not the elevator) let go. Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted July 15, 2012 Author Share Posted July 15, 2012 hi graham i will probable upgrade the motor to the one i found, BUT will take into acount all that you have said about the motor mount, CofG and the control flutter. i am going to beef up the motor mount as it got damaged in the dead stick landing. regards chris p.s if i end up with a big pile of foam on the floor i will know that i should have listend to you Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted July 15, 2012 Share Posted July 15, 2012 If you want a fast sports plane on a 2200 mah 3s battery then consider a Dogfighter, was flying mine with a fellow flier with a foamy Wot4, the Dogfighter was at least 50% faster Quote Link to comment Share on other sites More sharing options...
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