long running times on brussless motors

[alan nobleParticipant @alannoble83536]

Hi everyone i have been playing around with brushless motors this year.I have had some good times with them and some bad.Now I feel I am going forwards very fast.I am getting bags of power and long running times.I have fitted them in small and large boats.I have fitted them in jet drive and prop boats.I have a Cygnus GM33 fishing boat 1:16 scale (24.5" long x 10.25" beam),and on a 6volt 7ahp gel cell battery runs for 4hours.It has a Tornado Thumper 3536 Brushless motor – 400 watt 1000 kv outrunner .The motor runs cold all the time so no power used to heat the lake.I have a 1:16 jet drive lifeboat (33" long x 9" beam).This has 2x 300watt 1700kv outrunner  brushless motors.It has 2x 2500 ma 11.1 volt lipo battery’s,and runs for 3 hours.The motors also run cold in this boat.I have a 1:10 scale jet drive lifeboat (54" long x14" beam and coming in at 15kg).This has 2x Tornado Thumper 4250 Brushless motor – 720 watt 600kv outrunner.This boat runs for 1.5 hours on a 12 volt 12ahp gel cell battery.I have also tried the Tornado Thumper 4250 Brushless motor – 720 watt in my Speedline 1:12 Severn lifeboat.It went well ,at a bit over scale speed on 75 mm props,but they got a little warm.So i have two Tornado Thumper 5055 Brushless motors – 1280 watt 580kv outrunner on there way for it.The Tornado Thumper 4250 Brushless motor – 720 watt 600kv are going in a new 1:12 scale tyne class lifeboat.On the low rpm outrunner brushless motors it looks like you need 100watts of power per kg they work very well.I hope this is of some help to everyone.I will keep you posted on how the severn and tyne get on.

ALAN

[ashley needhamParticipant @ashleyneedham69188]

What I think we all want to know is roughly what brushless motors replace what standard can size brushed motors.. Is there a common  grouping of brushles types or do they get grouped by voltage or power?? how do you tell a torquy brushless from a high speed brushless???    Ashley

[alan nobleParticipant @alannoble83536]

Hi Ashley,you can tell a torquy brushless from a high speed brussless by the kv.

KV is RPM per volt

A high torque motor are low rpm and in most cases are outrunners  EG: 400KV to 1,700KV

A high speed motor are high rpm amd in most cases are inrunners EG: 1,700KV to 5,000KV

so in conclusion if you are running 12 volts and you have a brussless motor with a kv value of 600kv

you then times 600×12=7,200rpm,but then if you have a motor with a kv value of 5,000.then it would be 5000×12=60,000 rpm

hope this is of some help

kind regards

Alan

[alan nobleParticipant @alannoble83536]

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