Questions Questions Questions Hyper ST

[mjk37]

Hey all i'm new to the forum been into R/C on and off for about 20 years but just recently converted my ST Pro to Brushless.

I see all kinds of threads on the ST Pro here just wonder what the "most common gearing" seems to be.

I am running CC MMM 2200KV and have tried 13T, 14T, 15T, and 17T just wondering what kind of Temps are considered "safe" as I have heard everything from 140 to 200 degrees depending who you ask.

This will be a 4S setup cause I tried 6S with the 17T pinion and literally blew the tires of the front rims.

I guess i'm just trying to find a good starting point and i'll go from there any help greatly appreciated

Have attached a crappy iphone pic

[suicideneil]

Broadly speaking, you gear for a certain speed with any given setup- 'best' gearing gives you the speed you want & the temps stay in check; whether thats 40 or 60mph depends on what you desire. If you enter your setup info into BrianG's brilliant calculator it will spit out a pretty accurate speed estimate, just play with your spur/pinion options to get the result you want:

http://www.scriptasylum.com/rc_speed/_top_speed.html

As for temps:

Motor = 180*F maximum, ideally 120-160*F
ESC = about the same^
Lipos = 140*F maximum, ideally 100-120*F

4s & the 2200kv motor will be fine for anything upto about 40-45mph I'd say, how heavy is your truggy rtr & what lipos are you using?

[mjk37]

Not 100% sure of the weight (I guess I could put it on a scale) I am using 2*2S Venom 30C 5000mah packs in series and I also have 1 Losi 25C 4S 5000mah pack it shouldnt be much heavier than any electric conversion.

I never really had a speed in mind with the 15T pinion it is way to much for the track I am gonna run on just heard that under gearing is a problem as well I clocked it with a GPS and a 17T Pinion at 45mph motor never got over 140

And where do I take the temp reading for the ESC cause it never seems to get over about 90 where I am taking the reading from and lipos although hard cased asre cool to the touch.

Was just trying to get a good mid point of punch and race track speeds not trying to break any speed records thats the next project with a buggy I think.

[scarletboa]

Originally Posted by mjk37

Not 100% sure of the weight (I guess I could put it on a scale) I am using 2*2S Venom 30C 5000mah packs in series and I also have 1 Losi 25C 4S 5000mah pack it shouldnt be much heavier than any electric conversion.

I never really had a speed in mind with the 15T pinion it is way to much for the track I am gonna run on just heard that under gearing is a problem as well I clocked it with a GPS and a 17T Pinion at 45mph motor never got over 140

And where do I take the temp reading for the ESC cause it never seems to get over about 90 where I am taking the reading from and lipos although hard cased asre cool to the touch.

Was just trying to get a good mid point of punch and race track speeds not trying to break any speed records thats the next project with a buggy I think.

a 15-17t pinion will be just fine. it is harder to undergear these things than it is to overgear them, so don't be afraid to gear lower.

[bigboi146]

On 5s I had mine geared from 14-16 with the 52 tooth pinion... Never had heat problems.

[suicideneil]

For temp readings, try aiming the gun at the base of the motor wire bullet connectors, and in the side of the esc case between the slots- kinda tricky to get a good reading but you can get a general idea if the whole thing is hot or just warm..