sintered rotors

[andys]

Anyone up on these ? My question is, if I put the new sintered rotor in my novak 6.5 brushless motor, will it still have the performance as a regular 6.5 motor, similarly, if i put one into my 4.5, will it still have the same performance characteristics as a 4.5 ?

Is it simply more efficient, but essentially the same performance, or am I missing something, I read on the Novak site they run cooler and the braking effect is better. If it means the speedo / motor will run cooler, but essentially have the same performance than I might get a couple, anyone ?

Ta. Andy

[mark christopher]

they run cooler, better brakes and more power with the benifit of not effected by heat and dont fail as easy

[Richard Lowe]

And arnt currently BRCA legal

[andys]

Originally Posted by Richard Lowe

And arnt currently BRCA legal

I seem to recall reading somewhere that they will be in Feb ?

So, do they not alter the chracteristics of the motor you put them in as regards spec, with brushless is it the exact opposite to brushed, i.e the can dictates the spec of the motor, rather than the arm ?

[Northy]

Andy, 2nd of April they are legal.

I believe they make the motor more powerfull, but by how much I'm not sure.

G

PS, still got your ProCat part

[spenner]

I have been running the sintered rotor in my 5.5 for last two meeting's, you notice lot more punch and top end, runs lot cooler and the brake's are far stronger. These will be legal for the nationals.
The rotors can go into any of the diff motors, so i would say that the can determines the wind etc...

[Northy]

Originally Posted by spenner

I have been running the sintered rotor in my 5.5 for last two meeting's.......

Which two?

G

[mark christopher]

yup not legal till april

the rotor is just the magnets the can holds the windings

[andys]

Thanks chaps.

That confirms what I thought. Looks like it will be well worth investing in a couple then. Will the Novak rotor go into a LRP / Nosram motor I wonder ?

G. Will most likely see you at the Supercup for my 'part' if that's ok.

Mr.Lowe. Spotted your BJ with Brushless ! Are you converted ?

Andy.

[Chris Doughty]

before you start going rotor swapping,

I am waiting an email back from Paul Worsley about this.

I asked the question for legality of motors, do you have to use the rotor that comes with the motor out of the packet?

in effect, are we allowed to use 'hybrid' brushless motors?

I have not had a response yet, but I believe that the COMBINATION of rotor and can are homologated, so putting a sintered rotor in a can that would normally come with a bonded rotor would make it ilegal as that combination has not been homologated - but that is just my interpretation of the rules

once I hear something back from Paul I will let you know

[Richard Lowe]

Not just yet, that was the first time I'd run it so I've got a bit of messing about with gearing ect to do. It felt ..... different
The brakes are a bit bizzare and it wasn't as fast as I was expecting, it was about the same speed as my Checkpoint 11x2

[bigred5765]

not sure how it works with brush less, but I'm sure as long as its from the same manufacturer its OK to swap rotors,in brushed anyway

[Chris Doughty]

I didn't think that was the case Carl, so you can run a 'big comm' arm in a non laydown can? I know it might not work that well, but just as an example.

[mark christopher]

novak is differant but the nosram will fit lrp/reedy

[spenner]

Don't worry Northy haven't ran them at any Regionals etc....
Only winter series meetings, Kiddie and Stotfold.
Im sure the rules on BRCA web site just say Sintered Rotor's will be allowed, but it doesn't say anything about different can etc..
From BRCA Website:
9.7 The Rotor: Shaft diameter must be 3.175mm. Only one piece, two pole bonded Neodymium or Ferrite magnetic rotors are permitted until 01.04.07. From 02.04.07, sintered Neodymium or Ferrite rotors are also allowed. Magnet minimum length 23.0 mm, maximum 27.0 mm. Magnet minimum diameter 12.0mm, maximum 15.5mm.

[MattW]

I'm not 100% sure on this either, but based on the info that i have had in the past, i suspect that Chris may be correct.

However, if i was a manufacture, i would release all of my motors with sintered rotors as well. So if i were LRP i think i would offer a 6.5 with sintered and bonded, and 5.5 with both etc. GM have done this i believe. They have the Evo 2 range that are generally bonded, and the Evo 3 that are sintered.

They will have different power bands. For example, at the first big European Touring car event of the year (using 2007 rules, so sintered legal) - Ronald Volker won with an LRP 4.5 fitted with bonded rotor - despite sintered having theoretically more power. The rest of the LRP runners in the final ran sintered!!!

[Phil Channon]

As Chris said it is all about interpretation of the rules at the moment. However you have to ask why the BRCA would pass the sintered rotor as being legal, on its own ?
So if there is not a written rule saying you are not allowed to change the bonded rotor for a sintered version, well change away.

[Chris Doughty]

this should clear some things up...

Sintered rotors are available in some motors off the shelf, out of the packet (LRP 4.5 for example)

Here is an edited quote from Paul worsley in reply to my email on the topic of rotor swapping

------------------------------------
brushless motors using sintered rotors are legal for use at BRCA sanctioned events from April 2nd.
This includes Off-Road Nationals, as brushless was accepted at our Section AGM for 2007.
Allowing the sintered rotor was an EB decision at a later date, so that we are the same as EFRA.
I am not yet convinced that it is what Off-Road needs, but it would not be viable to have different Sections running to different rules within the same class of motors and policing the rotors would be impossible.

Swapping rotors :- This is not easy for me to answer yet, I need to see the new motor versions using sintered.
The situation has been complicated by the further rule change that allows Delta wind.
It is possible that the manufacturers will make the sintered motors with Delta wind. If this is the case, then swapping the rotor would create a 'hybrid' motor as you would not be able to purchase (or previously have purchased) a 'Wye' wind with a sintered rotor. This effectively means that you have a motor that has never been produced.

Certainly, you will not be allowed to swap rotors with different manufacturers. (EB Rule 4.5)

I will update you when we know more about the situation.

All the best,

Paul.
--------------------------------

so basically, the situation is not clear about rotor swapping, neither does it need to be until they are legal for 2/april/2007

Hope this clears things up

[mark christopher]

as far as i can see manifactures will just submit both, but i think its a farce if i carnt fit a nosram sintered rotor in a nosram 6.5 motor its hardly hybrid is it
can i take a epic based 12 turn motor and fit an epic 7 turn arm? yes!

[Chris Doughty]

Originally Posted by mark christopher

as far as i can see manifactures will just submit both, but i think its a farce if i carnt fit a nosram sintered rotor in a nosram 6.5 motor its hardly hybrid is it
can i take a epic based 12 turn motor and fit an epic 7 turn arm? yes!

but if epic do a 7 turn arm, and its also available as a complete motor (7 turn epic complete motor) then all you are doing is 'making yourself' what is all ready available off the shelf

putting a sintered rotor in a 6.5 you are making something that you can't buy off the shelf