Really good post Satoru_Sasaki.Thank you.
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My first time looking at the SkyViper, and I see a lot of good info in this thread.
In regards to the Kv of the motors, could someone measure the unloaded (no prop) RPM and voltage of a stock motor? The Kv will be the RPM / voltage. This seems to be the missing info here ā¦
llamatrails, probably not accurate but I tried the Audacity audio software, microphone, piece of tape on the bare shaft method. Several captures and all calculated to 60k rpm. So 16,200KV ?
Great !! That will make it easier to find replacement motors, maybe even use higher Kv ones too.
Thatās just my web search, amateur finding and it could be wrong. Donāt take it as gospel but 17,00KV is considered fast and 19,00KV insane speed by MMW. Iāve been buying my motors for other drones from BetaFPV on Amazon and they have worked fine.
Iām going to take some of this info and add it to the Wiki, since we donāt have anything official from Sky Rocketā¦this seems like the best info.
Just to make sure I have the info correct.
They are 8.5x20mm ~ 16,000-17,000 kV. The little pinion is 13T and the big one is special. lol.
Did I get anything wrong?
No I think you got it. I marked every 10th tooth on the special gear and it looks like 73T is the total. That would be a gear ratio of about 5.6.
If I were buying replacement motors I go with the 17,000K
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Cannot say if they are āgood motorsā but this may be worth researching. Canāt find dimensions but maybe a note to the seller?
. . . as a side note, has anyone attempted to install bronze bearings on the main gear shaft? I have seen pilots that are having trouble with gear mess clearances and this may help.
Just a thought . . . the frame seems to have enough meat to permit this since the stock setup has so much slop.
The stock motors in my Syma X5SW were 8x16. I replaced them with 8x20s. Youāll need 8.5x20s for the Sky Viper.
For REAL !! Six hours seams minimal for a new drone especially when Iāve got 4 batteries for my 2450 and can fly 30 to 4o mins So do I return drone to the store (purchased 2 yr warranty) or do I dive in and start learning drone mechanics 101??
Hi Jerry,
I just ordered 2 sets or motors from hobby king as I destroyed one engine the 4th time recharged my battery. One motor got stuck in long grass and I guess/hope it burned. I am new to drones I thought better crash in soft grass than on hard stone. I gues I learned a lesson here.
Only after ordering I noticed there are no gears/sprockets attachted to the motor. It is hard to exchange the sprockets between the motors? I ordered these (https://hobbyking.com/nl_nl/brushed-motor-4-pcs-per-set.html) Do you think I they fit the old sprocket?
I do see they are selling now at sky rocket. (http://replacementparts-skyrockettoys-com.3dcartstores.com/2450-GPS-Motor-set_p_143.html). Update. They only seem to ship to US and canada so no help there for me.
Did anyone every find out if the aliexpress SYMA replacemnet set fits the v2450?
Regards
Hans
I just ordered 6 3.7v 1200 maH batterys from banggood for $23 plus $4 shipping w/ a multi charger