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Old 10-28-2007, 01:52 PM   #1
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Default 10.5 Brushless & Lipo

Just been reading on http://www.rcracechat.com/ forum that 10.5 Brushless & Lipo has been voted in at the BRCA AGM today.

Good news for LIPO at last.
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Old 10-28-2007, 02:04 PM   #2
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That's Great News!
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Old 10-28-2007, 06:35 PM   #3
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27t has been dropped at National level as well.

oooh, It's all change

We can still run NiMh with the brushless motors though, and they have yet to put forward a spec/price for the 10.5's

Should be interesting next year, I have been a Stock runner since I started but the 'novelty' of skimming and changing brushes etc has worn off since I started using a 13.5 at club level!
Might go to the new 'Pro Stock' class or perhaps straight up to Mod.

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Old 10-28-2007, 07:21 PM   #4
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brushlesss is here to stay.

Now if there was actually a "spec" 10.5 and 13.5
it seams that some 10.5(19t) and 13.5(27t) are way faster than their brushed motor equivalents.
this makes it had for the clubs that want everyone to have fun. some 13.5's are as fast as a good 19t.
Thats why i have only brushless and I don't run stock.
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Old 10-29-2007, 05:36 PM   #5
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Quote:
Originally Posted by tdeal823 View Post
brushlesss is here to stay.

Now if there was actually a "spec" 10.5 and 13.5
it seams that some 10.5(19t) and 13.5(27t) are way faster than their brushed motor equivalents.
this makes it had for the clubs that want everyone to have fun. some 13.5's are as fast as a good 19t.
Thats why i have only brushless and I don't run stock.
What, unlike brushed 27t that are all exactly the same?

There already is a spec 10.5 and 13.5, just add the wind requirements. There will never be an exact match to brushed and even if there was one tech would over take the other sooner or later. Just have to accept that this is a transitional period untill brushed is only for bashing in the not to distant future.

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The following rules have been agreed by EFRA and various International organisations. Any further amendments/additions that are found necessary will be published by the EB on the BRCA website.

9.1 Sensored or sensorless motors are allowed.

9.2 The motor has to be rebuildable. Ball bearings are allowed.

9.3 If the motor is sensored:-

It must use a six position JST ZH connector model number ZHR-6 or equivalent connector with 6 JST part number SZH-002T-P0.5 26-28 awg. contacts or equivalent.
Wire sequence must be as follows:-
Pin #1 - Black wire ground potential
Pin #2 - Orange wire phase C
Pin #3 - White wire phase B
Pin #4 - Green wire phase A
Pin #5 - Blue wire temp control, 10 k Thermistor referenced to ground potential
Pin #6 - Red wire + 5.0 volts d.c. +/- 10%.
Compatible speed control must use the 6 position JST header part number X-6B-ZR-SMX-TF (where the X denotes the style of the header), or equivalent.

The power connector has to be clearly marked A, B, C.
A for phase A. B for phase B. C for phase C

9.4 The Can. (Based on `05` size specifications).
The overall dimensions of the assembled motor do not include :- solder tabs, lead wires or the original manufacturers logo or name.
Overall maximum diameter is 36.02mm measured at whatever point yields the maximum dimension. Overall minimum diameter is 34.0mm measured at whatever point yields the minimum dimension. Maximum length is 53.0mm measured from the mounting face of the motor to the furthest point of the end bell. Minimum length is 50.0mm measured from the mounting face of the motor to the furthest point of the end bell. Motor mounting holes must be on nominal 25.0/25.4mm centres.

9.5 The Stack/Stator : The stack or back-iron must be continuous. The laminations have to be one after the other without anything in between. Stack/back-iron minimum length 19.3mm, maximum 21.0mm. The thickness of the stack/back-iron laminations is 0.35 +/- 0.05mm. All laminations must be of the same material. Inside diameter of stack or windings equals the central space between the laminations or assembly of windings and must accept ‘plug’ gauges of 12.5mm minimum, 16.0mm maximum. These dimensions to be measured with the centre of the ‘plug’ gauge in-line with the centre of the motor can. (ie. concentric to can).

9.6 The Winding: Only three slot (phase) “Y” wound stators are permitted until 01.04.07. From 02.04.07, delta wound stators are also allowed. Only circular (round) pure copper wire permitted. No turn limit.

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.

9.8 All motors must have the original manufacturer’s logo or name moulded into the end bell.

Note:- At EFRA sanctioned events, Brushless motors are allowed.


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Old 10-29-2007, 08:29 PM   #6
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what about battery rules? anything on that yet?
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Old 10-30-2007, 01:39 AM   #7
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Quote:
brushlesss is here to stay.

Now if there was actually a "spec" 10.5 and 13.5
it seams that some 10.5(19t) and 13.5(27t) are way faster than their brushed motor equivalents.
this makes it had for the clubs that want everyone to have fun. some 13.5's are as fast as a good 19t.
Thats why i have only brushless and I don't run stock.
The NOVAK 17.5 motor makes a great 'slower' motor, it's actually closer to a 27 turn motor than the 13.5 from the testing so far.
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Old 10-30-2007, 06:44 AM   #8
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Quote:
Originally Posted by C_Suzuki View Post
what about battery rules? anything on that yet?
Mod is still 5cell, but the new 'Pro Stock' catagory (Stock has gone at Nationals) allows power sources up to 7.4V, which allows for Lipo as well as any other power sources that are being developed at the moment.
This means you can run NiMh's if you want as well.

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Old 10-30-2007, 09:12 AM   #9
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do you tihnk will see some of the big mod guys starting to join this class?
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Old 10-30-2007, 09:45 AM   #10
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Quote:
Originally Posted by SWTour View Post
The NOVAK 17.5 motor makes a great 'slower' motor, it's actually closer to a 27 turn motor than the 13.5 from the testing so far.
I asked Steve Weiss over on the Novak Thread about the 17.5T BL motor, and he said it would be close to 27T, but there was reservation about using it in TC. Looking at the wattage of the 17.5 to 13.5, there is a big difference.

10.5 = 235 Watts = 4200 RPM/Volt (31080 RPM @ 7.4V LiPo)
13.5 = 165 Watts = 3300 RPM/Volt (24420 RPM @ 7.4V LiPo)
17.5 = 130 Watts = 2200 RPM/Volt (16280 RPM @ 7.4V LiPo)
21.5 = 85 Watts = 1800 RPM/Volt (13320 RPM @ 7.4V LiPo)
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