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Old 02-15-2008, 03:15 PM   #3601
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What is the largest pinion that will fit on a '007 with a 100T 64P spur? The Brushless Gearing Charts from Novak state a 3.5 FDR with the 17.5, so that puts is right around 48t pinion. Will that physically fit?
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Old 02-15-2008, 04:03 PM   #3602
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What is the largest pinion that will fit on a '007 with a 100T 64P spur? The Brushless Gearing Charts from Novak state a 3.5 FDR with the 17.5, so that puts is right around 48t pinion. Will that physically fit?
I don't think a 100-Spur will allow you to reach a 3.5 FDR, no enough room. You will probably need a 96-Spur and 46-Pinion to reach 3.5 FDR.
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Old 02-15-2008, 04:11 PM   #3603
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Carbon, I'm not certain, but it's going to be near the limit. I recommend using a smaller spur, something like a 96 or 94. Search my posts in this thread, I maybe have posted some data back when I was running a 100t spur for a 13.5t.
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Old 02-15-2008, 04:39 PM   #3604
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Im confused................................not hard i know!

Looking through the on line xray set up's for 007 19t gearing it appears that people are using 48dp pinions with 64dp spurs, for example 24pinion 116 spur.

Is this correct and if so what are the advantages of this?
Cheers in advance

They would be using 64dp pinion
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Old 02-15-2008, 05:23 PM   #3605
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Carbon, I'm not certain, but it's going to be near the limit. I recommend using a smaller spur, something like a 96 or 94. Search my posts in this thread, I maybe have posted some data back when I was running a 100t spur for a 13.5t.
The smallest spur I can find that still has holes large enough to tighten the motor screws seems to be the PRS 96 tooth Pro Lite Touring, which they are phasing out. I posted a question on XRAY's site, and brano stated that they will be making a 100T spur. Big whoop, when we need something like 92 - 96.

What brand of spurs are people using for 17.5 Brushless? And how do you tighten the motor screws?
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Old 02-15-2008, 08:12 PM   #3606
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I can see that being a problem. You might want to go to socket head M3 bolts and use a ball driver, instead of ball head with a hex driver.

The sad part in this situation is that Novak pretty much crapped on us racers. Instead of designing a different motor that had a reasonable kV but crappy efficiency, they took the lazy and cheap route and just rewound their existing design. Now the entire market gets to try and cobble together hack fixes and make design compromises. On, and ROAR bought into this, so Novak is not only getting away with it, but striking gold.
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Old 02-15-2008, 08:24 PM   #3607
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Seems like the only options are to

a) use a drill press and make some of the holes in the spur bigger (and symmetrical to maintain balance), or

b) Set the gear mesh, only tighten the right hand screw, take the top decks off, remove layshaft/spur, tighten other screw, and re-assemble. Yuck, but it does work.

c) bug PRS to make the spurs that we need (Pro Lite Touring in smaller sizes)
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Old 02-15-2008, 08:30 PM   #3608
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Carbonjoe,
your B is what I did last year on rubber tire and it worked ok, not that hard to do on the Xray. Is a little bit of a pain but I have had to do worse in the past. Maybe the 009 or one of the other manufacturers will have a more brushless friendly internal ratio in the future.

adamge,
What you seem to want with the crappy efficiency is killing one of the biggest plusses of brusless. Would have been counterproductive for Novak.
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Old 02-15-2008, 09:22 PM   #3609
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tarheel, why do you think the 17.5 is slow? The answer is: crappy efficiency. A 3.5t and a 17.5t have the same ability to shed heat. The only reason you can run more power through the 3.5 is because it is more efficient.
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Old 02-15-2008, 09:27 PM   #3610
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Wow.... Novak made the 17.5 because the oval guys asked for one. Now you say they are lazy and getting rich off the 17.5's Well they also make a 21.5 for the oval guys. They asked and Novak stepped up.
Novak is one of the most racer friendly companies in RC and its sickening to have to listen to some know it all tell them they designed their motors wrong.
Run a 13.5 or 10.5 or mod if you cant get your car geared high enough... why arnt you bitching at the car manufactures for not putting in the "right" internal ratio for the current "legal" brushless motors.
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Old 02-15-2008, 09:27 PM   #3611
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The 17.5 is still a heck of a lot more efficient than an equivalent brushed motor.
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Old 02-16-2008, 04:40 AM   #3612
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The smallest spur I can find that still has holes large enough to tighten the motor screws seems to be the PRS 96 tooth Pro Lite Touring, which they are phasing out.
I checked PRS's website, http://www.precisionracingsystems.com/catalog/6 , and this sucks. I hope Xray starts making some smaller spurs, cause there is no way in hell you can run a 17.5 or 13.5 with their smallest 112-Spur.
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Old 02-16-2008, 07:24 AM   #3613
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On the PRS catalog, the main Spur page (http://www.precisionracingsystems.com/catalog/2) the text states "Our new Pro-Lite series will be replacing our Standard, Pro-Lite Oval and Pro-Lite Touring spur gears", yet on the 64 pitch spur page (http://www.precisionracingsystems.com/catalog/6), it states for the 64 Pitch Pro-Lite Spurs "THESE ARE OUR NEW PRODUCT LINE THAT WILL BE REPLACING THE STANDARD AND OVAL SERIES." Not sure which text is correct. I will ask them and add a post here.
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Old 02-16-2008, 09:20 AM   #3614
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kn, see http://forum.teamxray.com/viewtopic.php?t=7097
There, an Xray guy says they make down to a 104 and a 100 is coming.

tarheel, what data do you have to support that? I know I've just been called a know it all, but I don't. In fact, I've never even seen a 17.5.

-Adam
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Old 02-18-2008, 03:15 AM   #3615
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whats the differance between a 24 tooth 48dp pinion and a 24 tooth 64 dp pinion?
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