7.4V li-poly mr02 (feat. nelly deluxe!)

This topic has 14 replies, 8 voices, and was last updated 18 years, 1 month ago by ph2t.

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- April 14, 2005 at 4:45 pm #12611
  ph2t
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  Posts: 2088
  I ve been meaning to do a car like this for a while. The trouble of finding the right set of li-poly batteries to fit the dimensions of the battery holders was the main design challange I faced. In the end I did find some batteries and I have now a working chassis.
  
  This mr02 smokes! lol….
  
  In the pic below you can see the setup in it s pre-racing, “just wired up” state.
  
  Sitting right up the front is my new Nelly Deluxe turbo, yum! The motor is one of my Plasmatomics (of course!), running with neo magnets for now. 24AWG silicon wire all the way around. You might think it quite thin for the application, but it works a treat.
  
  My first set of li-poly batts I tried were based on set of ETEC HP 450mah batts. These had some good dimensions but are a tad long for the chassis so I needed to move the hplate into the middle notch in the chassis. Given that this is a MM chassis I will need to do some hacking to fit a shell on it. So far it s running naked! lol….
  
  In the pic below you can see how I dremeled out the battery compartments.
  
  Here s the current ETEC batteries, like my “saddle” pack? lol…
  
  Since Nelly deluxe regulates the power to 5V for the RX, both the signal wires and the 5V wires are routed to the RX PCB through a small, rectangular hole in the front. The li-poly pack connects directly to Nelly Deluxe using some dean s micro plugs. The motor is connected directly to Nelly.
  
  To swap out the batteries all I do is remove the oil shock from the motor side and swivel it off to the side. The batteries come out quite easily.
  
  Here s some more pics showing the setup.
  
  So far I haven t had much of a chance to try it out. I ve got it running a 6t pinion at the moment. Needless to say that even with the 6t I have no room to really open it up and it s raining today…. arghhh….
  
  On the speedchecker I m getting 45kph with a 6t and plasmatomic (neo config). That s petty good considering that the same setup with 4 cells yields 29kph. It s a 50% increase in speed basically. It s also VERY light, given that the li-poly is a lot lighter than 4 AAA cells.
  
  Anyways, that s enough for now. I ll get some video when I can, you won t be dissapointed, lol…
  
  The next step is to get my other Powerquest 600mah lipo s going. These lipo s will be just sweet for this setup. They are shorter and will enable me to use a stock mr02 chassis without any mods and then I can use the stock battery covers to hold the buggers in.
  
  I also need a ball diff, a proper motor mount(PN racing or Atomic alloy MM). I hate using spacers to get a fine gear mesh. The screw mounting method of the atomic and pn racing MM mounts is superior for fine tuning that mesh.
  
  Stay tuned!
  
  Expect Nelly deluxe within the woahnelly.com shop soon!
  
  ph2t.
- April 14, 2005 at 4:54 pm #59290
  betty.k
  Participant
  Posts: 2487
  if you can get that sucka to hang on around the corners it could spell the end of the xmod’s domination at templestowe!:shock::8ball:
- April 14, 2005 at 5:16 pm #59292
  peteWah
  Participant
  Posts: 1020
  It looks weird,
  What happened to the Orange Atomic MM that you were running…
  As for a 6tp on a Platomic with Neo magnets at 45kph with those lipo’s, Thats just fu@ken nuts mate…
  
  Are you going to be able to wind the thing out with bigger pinnions :smiley2: and if so what do you think it will peak at speed wise :D:D:smiley2:
- April 14, 2005 at 5:41 pm #59293
  betty.k
  Participant
  Posts: 2487
  that’s a different chassis to the other one pete:8ball:
- April 15, 2005 at 8:20 pm #59310
  merc-blue
  Participant
  Posts: 1547
  this sounds dangerous not onmly to the car and ur feet but also to you wallet
  cant wait to see some footage
  why dont u jusy get ur xmod and stuff in a mamba? a RX.. and servo
- April 28, 2005 at 6:14 am #59412
  ph2t
  Participant
  Posts: 2088
  Got my new clear blue chassis in the mail today so I could now finally put it on and get rid of the butched one you see in my previous pictures. This setup has several advantages over the initial setup.
  
  1) I’m using 600mah powerquest 12C discharge lipo’s vs. the 450mah Hi-Tec’s.
  2) These lipos fit in the AAA battery bays!
  3) The chassis is intact and I can finally put a shell on, lol..
  3) The hplate is now back in the shortest position (stock MM)…
  4) Using 1deg camber steering knuckles
  5) Using 1deg toe-in tierod.
  6) Lipo pack weighs 26grams, a set of four AAA nimhs weighs 49 grams!
  
  I use softer front suspension springs now, due to the decrease in battery weight.
  
  The camber helps the chassis hold the corners, I may put in an ultra-thin atomic h-plate I have to see if it will allow me to increase my speed through cornering.
  
  The diff is very slippery, otherwise I just spin out. A ball diff is a must in this setup.
  
  With the 6t pinion it’s soo fast it’s not funny. I’m going to swap out the neo magnets for ferrite ones soon to see if this helps. I could realistically reduce the torque on this.
  
  Here’s some pics, notice the knew lipos are thicker yet shorter, making this chassis way more viable.
  
  The shell is a Mclaren F1 MM shell. A great handling shell. I painted this one red and removed the rear (easily broken) wing. Bogged up a lot of holes/depressions, etc….
  
  Soon I’ll have some video, I promise! lol…
  
  Cheers,
  
  ph2t.
- April 28, 2005 at 6:17 am #59413
  TallduDe
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  Posts: 1430
  i like the f1 shell looks hot.
  
  hurry your arse up with that video :p
- April 28, 2005 at 1:00 pm #59414
  dgs73
  Participant
  Posts: 2179
  coming along nicely… definately need some vid of this in action…
- April 28, 2005 at 10:56 pm #59419
  ph2t
  Participant
  Posts: 2088
  I put a ferrite magnet plasmatomic motor in it now and tuned it to 83kph (51mph), this was with a 12t pinion. lol….
  
  here’s a small video of it.
  
  http://www.woahnelly.com/stuff/mr02/12t_pinion.wmv
  
  🙂
  
  ph2t.
- April 28, 2005 at 11:43 pm #59420
  micro_Amps
  Participant
  Posts: 1290
  Great stuff Ph2t, were do you source those cells from?
- April 29, 2005 at 1:05 pm #59421
  dgs73
  Participant
  Posts: 2179
  damn!! That be quick as… looks like you could top 100 kays with a 14/15 tooth pinion…:approve:
- April 30, 2005 at 5:47 pm #59425
  peteWah
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  Posts: 1020
  I went to look and this text keeps coming up…..
  
  Bandwidth Limit Exceeded
  The server is temporarily unable to service your request due to the site owner reaching his/her bandwidth limit. Please try again later.
  
  Apache/1.3.33 Server at http://www.woahnelly.com Port 80
  
  When can i view it:smiley2:
- April 30, 2005 at 5:53 pm #59426
  ph2t
  Participant
  Posts: 2088
  shit!
  
  I have no idea. I know I shouldn’t of post at those bloody xmod sites!
  
  ph2t.
  :dead:
- May 9, 2005 at 2:08 pm #59493
  ph2t
  Participant
  Posts: 2088
  quote:
  
  Quote:
  
  Great stuff Ph2t, were do you source those cells from?
  
  sorry I missed this q mate.
  
  I got them from trick rc.
  
  http://www.zagi.com/index.php?main_page=product_info&products_id=138
  
  cost me about $32USD after shipping, ouch!
  
  in the spirit of any rc nut though it was worth it! lol….
  
  ph2t.
- March 28, 2006 at 11:16 pm #30866
  HACHI-RYOKU
  Participant
  Posts: 286
  Their prices came down and they also have a 3 battery setup. If you buy 2 of those, you’ll have 6 batts and it’s a bit cheaper than buying 3 of the 2s set up. They also have free shipping in the U.S. for orders over $50. Here’s a linky; http://www.zagi.com/index.php?main_page=product_info&products_id=139
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