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speedy
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11.25.2008, 05:09 AM

So a bl-motor with lower kv doesn't have more low-end tq ?hmm i've winden a lot of cd-motors for airplanes and the ones with lots of winding turns was alot stronger than the one's with less winds ?

I mostly bash my e-revo ! So the motor scould be made mostly for bashing ! and i whant it to run cool for a longtime like 20-40min's ! How big lipopacks do i need to get 20-40min's runtime and maby 45-50mph topspeed ?

Last edited by speedy; 11.25.2008 at 05:11 AM.
   
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azjc
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11.25.2008, 05:28 AM

Quote:
Originally Posted by speedy View Post
So a bl-motor with lower kv doesn't have more low-end tq ?hmm i've winden a lot of cd-motors for airplanes and the ones with lots of winding turns was alot stronger than the one's with less winds ?

I mostly bash my e-revo ! So the motor scould be made mostly for bashing ! and i whant it to run cool for a longtime like 20-40min's ! How big lipopacks do i need to get 20-40min's runtime and maby 45-50mph topspeed ?
with a 1515/2.5d and a quality 6s 5000 lipo pack expect run times of about 25 mins
   
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suicideneil
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11.25.2008, 11:07 AM

Quote:
Originally Posted by speedy View Post
So a bl-motor with lower kv doesn't have more low-end tq ?hmm i've winden a lot of cd-motors for airplanes and the ones with lots of winding turns was alot stronger than the one's with less winds ?

I mostly bash my e-revo ! So the motor scould be made mostly for bashing ! and i whant it to run cool for a longtime like 20-40min's ! How big lipopacks do i need to get 20-40min's runtime and maby 45-50mph topspeed ?
It is true that lower kv motors will have more torque, but the difference is only noticeable when there is a big change in kv rating, rather than 1600kv vs 2200kv. It also has a lot to do with the size of the motors- a big fat 22xx series motor will be a lot stronger than a 15xx series, but then you dont spin the larger motors so fast as they use tall gearing to make their speed.

Outrunners that are used in planes make tons of torque, but they are a very different animal to inrunners, so the amount or size of the windings tends to be quite different- again, much more pronounced difference in torque vs speed really.

I'd say for your bashing purposes a 1600kv 1515 neu would be ideal- run it on 6s with appropriate gearing and it will last atleast half an hour with 6s lipos; thats the beauty of a higher voltage & lower kv setup = less current draw due to better efficiency.

As for which lipos- a pair of 3s 5000mah items is fine, or a pair of 6s 4000mah in parallel if you wanna go a bit nuts on the runtime. Nothing lower than 20-30c though for the 3s lipos, or 15-25c for the 6s lipos.

Last edited by suicideneil; 11.25.2008 at 11:12 AM.
   
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