Blades colliding | General Syma S107 Information | Syma Forum
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I have two new 107G helicopters. After 3 flights both of them suddenly started to have this weird problem where the top and bottom blades would collide with each other which obviously makes for a rapid crash. The connect buckles at the top are also popping off. I don't see anything broken on either helicopter. The connect buckles are intact and they are easy to pop back on, but something is obviously out of whack.
Has anyone had this happen?
I have the same issue. I have one blue 107G that we just started to use today. It worked great until it hit the ceiling, flipped over and then landed upside down on the floor. The buckles won't stay on and I thought that perhaps they needed to be replaced, but it seems like more than that. If I snap the buckles on tightly it will take off and fly for a few seconds and then the blades hit and it crashes.
Firstly, I would make sure that you have a genuine 'Syma' heli. (check under heli links in column on the right) I have a S107 and it has had a very hard life and is flying as good as the day I bought it. Fake Syma's are not made from the same tough, durable plastic as the genuine ones, the good news is, I believe the parts are interchangeable.
Secondly, if the top blades are touching the bottom blades in any way then you might want to check the screws that hold the blades on, careful here not to over tighten them and strip the thread! Connect buckles are easy to replace and not expensive, a good whack on the ceiling could smash them.
Hint; On take off, I always slowly lift up to head hight and then adjust the rudder trim.
I believe both of them are genuine, yes. Bought from Amazon a couple of days ago and as far as I can tell from the pictures it looks ok.
This shot shows the circuitboard:
For the problem, it seems like it is because that top rotor holder is able to swivel too far. It droops to the point where the rotors overlap by a lot. The screws holding the blades on seem tight and doesn't seem to be the cause since it is the swivel thing they are attached to that is drooping. See:
For the full-size images and more of them see http://phpics.com/syma107/ and click twice on a photo to get the original huge version.
Ok, I figured it out. If you look at this picture:
The 3rd from the top horizontal black bar there holds the blade assembly. Both of those protruding plastic pieces have sheared off on both of my helicopters. A picture of the breakage:
Now I need to figure out what to do about that. Simply getting a replacement doesn't seem like it would really fix it considering how quickly and easily it broke. I need a stronger solution I think.
Curious to hear your ideas on fixing it. We got a little carried away at work today. Played a little Godzilla, and then someone decided to throw a set of ear buds at the rotors.
Anyways, the little nubs sheared off of the main shaft as well. I spent some time trying to glue them back on, only to have them break off when reassembling the whole thing.
I'm thinking of either drilling a small hole and inserting small screws into the assembly, or just drilling through completely and inserting some kind of metal or strong bar all the way through.
I may just have to buy a few shafts and be a little more careful about flying the damn thing. It just seemed so indestructible!
@Rasmus Earthsea has explained things well-just consider maybe buying a new Syma S107 and strip down your crashed one for spares,just a thought,as I have heaps of crashed Syma's and hardly buy spares now,each crash does different damage so if you have a few Syma helis you can nearly build a new one from the old-Any how keep us all posted-SF
The thing is that I have two of these and they both broke in exactly the same way. So, in my case at least, they don't break in different ways. My reconstruction is in progress. rogerly, note that you can't drill a hole right through and insert a rod because the main rotor axel goes through that area and to the top of that black piece.
I have drilled a hole through mine and inserted carbon fiber rods with a touch of glue on each side of the rotor axel. I still need to file down the glue slightly to make it swivel freely on the rods. We'll see if the fix holds up.
Here is the fixed piece. Hole drilled all the way through with a tiny hand drill and then two small carbon fiber dowels inserted and glued. Then sanded down slightly further than shown in this picture to remove excess glue and to shorten the dowels slightly since the blades sit at the end of these dowels and if they are too long they get in the way.
And yes, somewhat surprisingly the fix works perfectly. The fixed helicopter is flying again.
Hey Rasmus,what a brilliant fix well done,great photos thank you for your effort in posting
hey Rasmus, i have the same experience. Original Syma 107G after 1 month happy flying the little bird yesterday started to vibrate in mid air and came crushing down as the blades collieded.
I tested at ground level and saw first like TBE but then the dam blades crash as the top blades go out of balance due to wobbly spin. I had a look today at the Fly bar, links and screw tightness, because that is the symptom for TBE. The flaybar had no damage and after cleaning it with silicon spray and mounted back the fly bar could more freely move.
i powered up the little bird and the blades were hitting each other even more frequent. i also removed the flybar connection of the main shaft to check for bent shaft or and hard points while turning on the gear box.
NOTHING there either , i started to scratch my head. So i jumped in the forum. Seeing Blades colliding aha!!!!. I checked the blad holder for those two missing plastic stoppers and wa la !!! mine both broken also.
Now I try to fix it also. If not get a replacment.
Thanks mate ! 20
I am having the same issue. After our maiden voyage the blades started colliding. Until I found this forum (thanks Google!) I was completely bewildered by the performance drop in the heli. Has anyone (KaponE) been able to fix this using a small paper clip inserted through drilled holes? I am no expert on the structure of the helicopter and do not want to begin deconstructing it until i have an easy, cheap fix. Thank you.
If you put a paper clip or anything right through, it will stop you getting it down far enough to the point where the screw holds it in place on the shaft. Better to get a new part.
old iron spine, i have figured out the best fix of all, i am taking it back to my RC shop tomorrow and asking for a new one, also, i tried (before clashing of blades) the removal of the throttle spring, horrid, i recommend stretching the spring to reduce the shut off, or just keeping your thumb on it to keep it steady, LOL
also wondering about the camera, anyone know where you can get those micro spy keyrings? FASCINATED! i wanna make one!
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