Ballistic 550's a reality

[simplechamp]

Originally Posted by NovakTwo

Bob asked me last evening just what you guys plan to do with the low Kv Ballistic 550s; so, I'm asking....

I'd be quite happy with anything 1800-2000kv, so the 10.5 or 11.5 is what I'd get for my 1/8 buggy running on 4S lipo.

[NovakTwo]

Thanks for the inputs---I'll let him know.

[snellemin]

It will go into my crt.5 and a buggy.

NovakTwo, how about asking Bob about this. IMO running these motors in a 1/8 buggy type setup, with a low KV value, 2000kv, or under, on 4s, will either run slow, or get to hot. I understand wanting such a KV, but from my experience with your motors, they do better making their power with rpm's and gearing lower, then gearing up, and having the motor pull more.

So I guess my question would be, what would be the ideal KV for a 1/8 scale buggy on 4s? Or at what KV range do the HV motors see the highest efficiency?

[NovakTwo]

Good question; I have forwarded this to Bob and Adnan.

Busy day today; we are sponsoring two races this weekend at which we plan to do more Kinetic Havoc Pro SC Beta testing. One is the SC race at WCRC.

Originally Posted by asheck

NovakTwo, how about asking Bob about this. IMO running these motors in a 1/8 buggy type setup, with a low KV value, 2000kv, or under, on 4s, will either run slow, or get to hot. I understand wanting such a KV, but from my experience with your motors, they do better making their power with rpm's and gearing lower, then gearing up, and having the motor pull more.

So I guess my question would be, what would be the ideal KV for a 1/8 scale buggy on 4s? Or at what KV range do the HV motors see the highest efficiency?

I'd like to know aswell. Been wondering the same thing.

[simplechamp]

Originally Posted by snellemin

It will go into my crt.5 and a buggy.

I was thinking the same thing, because I had already wanted to try it in my buggy, and now I picked up a CRT .5 kit. I might buy the lower turn, higher kv wind to use in my CRT .5 because it will be available right away, then get the higher turn, lower kv wind stator when they become available.

Good question; I have forwarded this to Bob and Adnan.

Any input on this yet?

[NovakTwo]

Originally Posted by asheck

Any input on this yet?

This is his response:

This is a tough question to answer. It is not a question of the KV on our 550 motors but a question of these motors not having as much Horse Power as the Castle and Tekin 1/8 scale motors. Trying to keep up (racing) tends to overheat them no matter which Kv 550 they may use.

Those of you with more specific questions could email bob@teamnovak.com directly---cut out the middleman....

[crazyjr]

I have been wanting something like this in a 1/10 scale castle motor (2000-2700kv), on 2s lipo. My belief is, the motor kv is an indication of powerband, While they all make the same power, Theoretically, They make it at different places on the RPM spectrum. For instance, the HV 4.5 (5000kv) and the 10.5 (Roughly 2000kv), While both make the same power under load, The torque band will be lower in the lower kv motor. Plus with the lower kv motor, you have the headroom to raise the voltage and gain from the efficiency of using less amps over letting the voltage do the work

Almost forgot, My plan for one of these is in a CRT.5 on 5s geared for mid to upper 30's

I sent a better more detailed note to Bob, so Maybe we'll get a better answer.

But here's my thoughts. We know that the 550's put out much less torque then the CC motors. As they are a 2-pole motor, and their rotor has much less mass. But being a smaller diameter lower mass rotor, allows them to turn higher rpm's, with less cintrifugal loads.

So by using this equation of Torque x RPM's = hp = watts = amps x volts
we know that torque or rpm doesn't matter, they should draw the same power, either way, for the same speed. So it's really all about which way the motor does it most efficiently. Which is where the motor's ability of producing less torque, comes into play. For a 2000kv motor to be pushing the same speed as a 4000kv motor, it must make twice the torque. If making that much torque, is more inefficient, then running that rpm, which imo it will be, the higher kv motor will be cooler.

[hlb14]

so which would be better suited for an rc8 on a tight indoor track limited to 2s lipo? i did the math on a 5.5 being 3700kv geared 17/46 to equal roughly 28 mph and ordered a 5.5... then i read the tuning rotor that comes with the ballistics reduces the kv by 20%. Would the 4.5 work better? O, i will be using a mmp if that helps, thanks

[ta_man]

Originally Posted by hlb14

so which would be better suited for an rc8 on a tight indoor track limited to 2s lipo? i did the math on a 5.5 being 3700kv geared 17/46 to equal roughly 28 mph and ordered a 5.5... then i read the tuning rotor that comes with the ballistics reduces the kv by 20%. Would the 4.5 work better? O, i will be using a mmp if that helps, thanks

You should also consider that the Novak motors don't reach rated KV under load. I tested a HV6.5 in a 1/8th buggy and it was running at only 3000KV at the top speed of the car (on 4S geared 9:46 with standard buggy diffs) vs the rated KV of 3400.

[NovakTwo]

Originally Posted by ta_man

You should also consider that the Novak motors don't reach rated KV under load. I tested a HV6.5 in a 1/8th buggy and it was running at only 3000KV at the top speed of the car (on 4S geared 9:46 with standard buggy diffs) vs the rated KV of 3400.

All of our motor Kvs are measured (and listed/speced) "unloaded".

[ta_man]

Originally Posted by NovakTwo

All of our motor Kvs are measured (and listed/speced) "unloaded".

Exactly. So a speed calculation based on the speced KV will not give a true indication of the top speed of the car.