Good day HaraShota. It is really nice to hear from you.
- How fast can it fly? Or can it fly at a speed faster than 18m/s (40mph)? (if top speed is unknown to you)
Seems I did not test 40mph speed on MR210 before so I could not assert that. I checked flight logs and seems I did reach 12m/s. Personally I believe 18m/s or even higher is not an issue for MR210, as can take records for reference from other similar gears.
One limit of MR210 is it tolerant up to 5S battery, not 6S. But for 40mph speed this should be enough.
- I learned that this product can be connected to PC (QGroundControl) via Wifi.
How far can this drone fly while being connected to PC?
MR210 does not come with a wifi module by default, so you will need an external wifi module installed to connect to PC via Wifi. The range would really depend on the module selected. However, if you use PC's wifi module as the other end on the ground, the range would be also limited as it is bi-directional communication. Usually that will be limited to around 100 meters. If you want larger range then some long range radios are advised.
Please note that, to use wifi/long range radio, or GPS, an interface board is recommended.
- The shape of the 5’’ 5030 propeller used with this drone resembles the GWS Direct Drive 5030 propeller. Do these
Props on MR210 is GEMFAN 5030. And I think you are right that It is GWS-Style Direct Drive 5030 prop.