Go Back   oOple.com Forums > Car Talk > Mardave

Reply
 
Thread Tools Display Modes
  #1  
Old 19-08-2014
200sx 200sx is offline
Member
 
Join Date: Apr 2012
Location: Nottingham
Posts: 266
Default 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.
Reply With Quote
  #2  
Old 19-08-2014
JimboJames1972 JimboJames1972 is offline
Member
 
Join Date: Jun 2011
Location: Bury St Edmunds, Suffolk
Posts: 69
Default

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
__________________
James Garrett - BRCA GT12 Rep
Reply With Quote
  #3  
Old 19-08-2014
200sx 200sx is offline
Member
 
Join Date: Apr 2012
Location: Nottingham
Posts: 266
Default

This is the motor:

http://www.hobbywing.com/product_show.asp?id=305

Using a Speed Passion Reventon R esc in blinky
Reply With Quote
  #4  
Old 20-08-2014
JimboJames1972 JimboJames1972 is offline
Member
 
Join Date: Jun 2011
Location: Bury St Edmunds, Suffolk
Posts: 69
Default

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
__________________
James Garrett - BRCA GT12 Rep
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
oOple.com