CraigH

The KR and PT spin freely with brushes in it.

JohnB

iTrader: (1)

I was wondering what was the matter with a few of the drivers in the video. One I notice was (I THINK) Pavidis. In the video all the drivers were pretty equal the first few minutes and then he started getting blown away on the straight. I was thinking it was a battery issue, not motors, as I know Reedy would have their guys motored up. ? . ?

Joe Pillars

The cars slowing down at the end of the races was a combination of batteries and motors getting hot.

speedxl

kna it was motor heat because at thier level the battery power they've got! it is not a concern!
Billy easton was complaining of motors getting to hot. they were running fans and scoops to cool the motors.
I just cant remember if they were kr or ti motors in his car but it was the same thing they were ripping fast for the first 3 1/2 to 4 minutes then the cars would slow a little.

speedxl

craig not necesarely true my motor has strong magnetes and they dont spin freely . pluss he doesnt have a kr or ti.

Andrew Swanson

a 4 magnet motor will fell like it has less magnet (spin freer then a 2 magnet motor)

KR and PT (which he has) are both 4 magnet

the only difference is

KR= MID COMM with laydown brush

PT= SMALL COMM with standup brush

so a PT is basically a TI with a 4 magnet can.

if the magnets feel weak it could be just an old motor the older they get the more the magnetic field gets weaker.

also if the previous owner left the motor in a metal box that can leave weak magnets.

so i would try it first then if you have a problem contact the previous owner.


John B- The HEAT issue is on both motors and batteries but its focused more on the motors. When the motor gets so hot it burns the brush because it burns all the lubricants once that happens it attacks the comm and as soon as the comm gets black or really hot the can is roasting and so it looks visually like the car is dumping the battery (which does hapen often) but it is actually the motor being so overworked it cant go no more. LOL

speedxl

okay sorry I wasnt aware that the pt was a small come stand up brush kr.
my bad thought it was one of thier older motors

JohnB

iTrader: (1)

Yes, I know that feeling. The best part is when you pull the brushes out and their about 1/8" long
I have never a 7 turn motor, I could see the problems that develop when you run that low of a wind. From the sounds of it, 10 heats with 30 drivers roughly, the motor problem ratio is pretty low as hard as they are pushing the motors.

Mike Haynes

iTrader: (2)

I just got a new reedy kr to try out, it spins very free with the brushes in it, just about the same as a revolution form orion with no brushes. just for reference.

wrxmy99

Hey all

Anyone got any idea on a starting rollout for a 8 x 1 Peak Surikarn Vantage?

Track is large outdoor (3 netball courts side by side).

Just a ball park would be great and I'll experiment from there as I've never had a low mod like this B4...

Cheers

Andy

onnetz

anybody else change the brush hoods on the D5 to use standard laydown brushes?
I did this today and it seems quite a bit faster, and runs cooler..
gear ratio I was using was 7.83 for a 12x1

just curious what others have experienced doing this...

AdrianM

iTrader: (4)

I was running a 8x2 Reedy Ti (14 deg timing) at a 8.48:1 final drive this last Sunday with no problems. It was a 140x70 track with lots of tight corners. Somewhere between that and 9.00:1 would be a very safe place to start.

Remember that under gearing and over revving a mod will kill it just as fast as over gearing.

Jon Kerr

iTrader: (17)

Adrian, you were using a Ti motor with the smaller comm and laydown brushes?

Shalala

Local racer gear Ti 8D is about 100:31 or 100:30= 8.06 ~8.33
Refer to instrustion of Kr is to gear it less one to two teeths , so it would be around 100:29 = 8.6.

So , i use about 13~15 degree timing with stock spring with stock brush (767 ?) . I cant feel the speed , not so punch and not fast at the top end. So i try to gear pinion teeth larger to about 104:32 =8.125. The speed is very nice , powerful punch and great top end.

Qs1: Why the gearing Kr is same as Ti ? (not smaller 1 teeth?)

Qs2: Really need to gear Kr small 1 teeth? Anythings wrong?

Qs3: What is the FS unit of the stock motor spring (copper colour)of Kr ?

Qs4: In the local RC shop , there is hard to find trinity motor spring , can i just bend the stock spring harder ? How much should i bend?


* I just afriad if i gear the Kr too harsh ........

D1DriftKing

hey guys. i have just purchased a Orion Havok 19T motor. i just want to know how this motor performs. like does it have high or low torqe. is it better at acceleration or high speed sprinting. thnx for any info.