I have a set on my Inspire 2 and upon hearing your experience it concerns me as well. I too constantly check the torque of the mounting system before each and every flight. I’m very alarmed by your bad experience with the Tmotor propellers and I hope this is an isolated case. Also I want to say how sorry I am to hear of all the damage that you received during this incident.
Phil, you mention that you check the torque before every flight, checking the torque value to me implies the use of a calibrated tool, what value are you checking? Are you just checking the props are snug or do you actually have a specific value that they are tightened to?
Very good advice for the Tmotor props as far as being watchful of how I need to be when folding them up for transport. I’ll definitely be taking your comments seriously.
No I don’t have a calibrated tool I simply check them for a snug fit. Before each flight I just check to make sure that the mounting screws are tightened up. It’s more of a feel than anything else. I hope that answers your question??
Thank you Phil, yes that answers my questions. Was hoping that someone actually had a torque value for setting the props.
Yes you would think that the manufacturer would provide a torque setting that we could use to make sure we had a proper torque value on the mounting screws but oh well. I guess they figure it isn’t a big deal. But then we would need some kind of torque wrench for them and that would be a hard thing to find I would imagine. Does someone make a torque wrench that small? I haven’t got a clue? If you have any ideas on where to find something like that please let me know. I am interested in finding one.
Guys I think you are making too much of a deal of this. I know that there are users with natural feel for mechanical things and then there are those with not so much. But honestly this is not so complicated. As I said I do not have these props but I have been flying RC helis for years and both tail props needed to be tighten equally and optimally. Not too tight and not too loose. They both needed to outstretch with centrifugal force to optimal position to avoid vibration. As I said it is all about feel. No amount of torque info can replace that.
I agree with you that people are making this issue way too complicated. It’s simply a matter of feel when you’re tightening the props. Kinda like when you’re replacing your tire after having had a flat. Just don’t strip the lugs when you’re tightening them down. Same idea here too.Guys I think you are making too much of a deal of this. I know that there are users with natural feel for mechanical things and then there are those with not so much. But honestly this is not so complicated. As I said I do not have these props but I have been flying RC helis for years and both tail props needed to be tighten equally and optimally. Not too tight and not too loose. They both needed to outstretch with centrifugal force to optimal position to avoid vibration. As I said it is all about feel. No amount of torque info can replace that.
That would be interesting, you can send us a PM, if you like. We just spoke to a friend that works in automotive and they might have the right tools for making an aluminum test run prop. We do really like the idea of making them as one single element, rather than a mixed materials & parts propeller. The aim is to have a no brainer prop with some proven added benefit that also fixes the mount. Basically a set it and forget it prop, just like DJI's, only without the well known mount flaw and with the extra bonus performance.
Now I agree with you but don’t you think that they would be extraordinarily expensive!! And DJI would throw a fit if you ever had to send your Inspire 2 in for repairs. Would definitely void the DJI Care Refresh program.
Guys I think you are making too much of a deal of this. I know that there are users with natural feel for mechanical things and then there are those with not so much. But honestly this is not so complicated. As I said I do not have these props but I have been flying RC helis for years and both tail props needed to be tighten equally and optimally. Not too tight and not too loose. They both needed to outstretch with centrifugal force to optimal position to avoid vibration. As I said it is all about feel. No amount of torque info can replace that.
As I said before I would appreciate the manufacturer to provide a recommended torque value for the Tmotor props but they didn’t so I just do the best I can with what’s available to me and that’s by the feel of the tightness of the propeller mounting screws. Although I am going to take your advice and look on Amazon for a miniature torque wrench. That way I can at least get the screws tightened to the same setting. I don’t know if it’ll make any difference but it’s worth a try.
Phil, look for a tool that has the range of 5 - 60 cN.m, anything larger would probably not have the accuracy for this size of screws and torque. I can tell you that the props come from manufacturer set to 50 cN.m
There are other variables at play. The ease of move can be affected by smoothness of the surface of the props and the internal surface of the fork where the prop goes to. Tiny amount in any of such variation or tiny burr on the internal edge or a bit of finger grease can change the equation. And from experience the force required to move the prop in the fork can vary with angle too. So, what I am trying to say is that feel might be in this instance more reliable indicator of the proper screw tightness than the torque applied to the screw. The same torque might not necessarely result in the same stiffness of the prop in the fork. The only scientific approach would be to measure the force required to move the prop at a specific distance from the pivot screw. But that is a another thing altogether. Because of all the above I have never been a fan of foldable props on MC.
