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#1
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LRP 3 star gearing?
Anyone know what sort of pinion should be with for the old style LRP 3 star brushless motor with stock spur?
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#2
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20-22 was the range i used last year
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#3
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I dont know what the stock associated spur is (82?), but isnt it
Spur / pinion * internal drive = drive ratio 82 / 20 = 4.1 * 2.43 (xxx-cr it the only one I know) = 9.963 (or 9.9:1) According to the LRP website manual for x11 (yes I know it's the older motor, but still around 55k rpm), drive ratio for the 5.5t is around 13.0:1 or 14.0:1. On the Losi, that makes a pinion of around 14/15 Youd have to substitute the associated spur and internal drive ratio obviously |
#4
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Found on LRP site ratio should be 11.0:1 so that makes pinion 19.
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#5
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i am quite sure mine is the three star motor, and i am running 21 tooth pinion with stock spur gear on an original lrp sphere with reedy motor combo. Baz Weldon used to run his on a 19 pinion and always thermalled it.
that was on a b4 too. |
#6
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wouldnt a bigger gear (higher ratio) be the cause of thermal due to over gearing?
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
#7
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Nosram 3* on 18/19 with 78 spur indoors @ TRCC with X6 (uses a B4 gearbox internals)
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#8
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Last year I used a 4 star for a couple of meetings and ran a 17 or 16 pinion, so 19 sounds about right to start off with for 3 star. Will just see how it goes on track.
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#9
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Quote:
the gearing i am using came from a suggestion by Doughty on his website, so who am I to say it's wrong? |
#10
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not saying its wrong , just curious as maybe we go the wrong way with gearing wen we have a thermal!
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
#11
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Maybe its just down to Lead thumb Weldon
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#12
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Quote:
My 'ASSUMED' reasoning being that you were not making the motor have to rev as high to achieve a speed, the higher the rpm the faster the esc has to switch after all, and as i understand it is the switching that causes the heat build up in the esc. The higher load in the system of higher gearing is less damaging i again assume. I left a 21T pinion on mine all of last season rain or shine without any problems. Last edited by pro4nut; 07-04-2007 at 09:09 AM. Reason: Missed a bit |
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