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#1
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Mardave VRX CE 21.5 2s rollout
Evening all
What's the recommended starting mmpr for a 21.5 on 2s (medium size carpet track)? I run 60-65mmpr with my 13.5 1s on the same track depending on layout. |
#2
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Hi,
When I did my testing a year or so ago I would usually end up 2 pinions lower on my 2s/21t setup than I did with 1s/13.5t. This was for small-medium sized tracks (biggest regular track I attended was 20x12m and the smallest was 17.5x10m). NOTE: This was with a fixed timing HobbyWing 21.5t motor. My guess is that "modern", variable timing 21.5t motors will still need to be geared lower than a 13.5t but it might be just one pinion. Hope this helps, James
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James Garrett - BRCA GT12 Rep |
#3
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This is the motor:
http://www.hobbywing.com/product_show.asp?id=305 Using a Speed Passion Reventon R esc in blinky |
#4
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Ok, not exactly the same as the ones I used, but by the looks of it yours is non-adjustable with the timing? Probably just a change in paint from what I used...?
From this, I would suggest a gearing of between 55mm/rev and 60mm/rev, depending on track size. By the way, what cells are you using? In my testing I started with "shorty" packs. These were extremely fast to recharge, even at 1c charge rate their capacity of 4200mAh meant that a charge rate of 4.2A recharged them in less that 15min (2s/21.5t takes very little capacity out of the cells). However, the shorty packs are slightly bigger than hard cased 1s packs, expensive and heavy. I ended up with the 1800mAh packs used in micro off-road buggies. These were cheaper, still recharged quite fast but I had to be a bit creative when fitting them to my chassis and getting it back up to 950g weight. If you search for "How to power a Mardave" and read the thread on RCRaceChat, all my test data is there James
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James Garrett - BRCA GT12 Rep |
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