the body has a lot of work to do dosent it.
and i look at these nitro guys not running a body (cause of the starting ease without one) and shake my head. no wonder their cars get broken so often...noobs.

a body is even more important for converted revo's with soft case lipo's.
road rash on a lipo is the quickest way to turn a 6s pack into a 4s LOL

Geez people were not kidding when saying the back end of the Baja Bug body was weak, right in that bend around the flat spot where the body posts stick through. Just a couple tumbles and it's cracked already. That is what I would call a major flaw on that body. Disappointing to say the least. I did the best I could to repair it and hope it holds but I wonder. I am not going to show a pic because I am a shamed of that repair, it looks like crap :lol:

Couple layers of scrap lexan and some shoe-goo and good as new. Who cares what a repair thats underside the body looks like, long as it strong and lasts.

like i said...
i actually cut out the entire rear section, only leaving that vertical wall where the carbon fiber sticker goes....

then i used some washers and pop rivets to fasten a piece of bent roofing iorn to it. the washers spread out the force a bit.

overkill i know but i broke my first one where i did the same thing but with lexan.

hope you can re-enforce it somehow ;)
maby my method but do it on the inside of the body so you cant see it and leave the existing plastic there...just double it up, pop rivets look nice with washers too :wink:

I'm having a little fun with my CBA II Battery Analyzer right now, I just analyzed a pair of NEU 5500 mah 2S lipos. From the results, it seems one of the packs (black graph) is failing me. And what do you think of the other one (red graph).

NEU #1 (in black)
Discharge rate: 10 A
Starting voltage: 8.36 V
Ending Voltage: 6.00 V
Total Time: 28 min. 48 sec.
Tested Capacity: 4796 mah

Neu #2 (in red)
Discharge rate: 10 A
Starting voltage: 8.43 V
Ending Voltage: 6.00 V
Total Time: 31 min. 56 sec.
Tested Capacity: 5314 mah

http://i177.photobucket.com/albums/w..._5500_2s_1.jpg

I just tested two Turnigy 5000 mah 2S packs and here are the results.

Turnigy #A1 (in black)
Discharge rate: 10 A
Starting voltage: 8.44 V
Ending Voltage: 6.00 V
Total Time: 30 min.
Tested Capacity: 4996 mah

Turnigy #A2 (in black)
Discharge rate: 10 A
Starting voltage: 8.44 V
Ending Voltage: 6.00 V
Total Time: 30 min. 29 sec.
Tested Capacity: 5076 mah

http://i177.photobucket.com/albums/w..._5000_2s_1.jpg

Here are the Turnigy graphs and NEU graphs overlaid for comparison.

http://i177.photobucket.com/albums/w...s_turnigy1.jpg

These NEU and Turnigy lipos were not bought at the same time but they have similar use, the NEU lipos have 11 cycles more on them than the Turnigys. After the test, the Turnigys got recharged at ''store'' setting on my CellPro 10S with no problems. The NEU packs would not take a charge on the CellPro. I had to wake them up shall I say on my MRC 989, charging at 1 amp until they had about 1300 mah back in them and then switched to the CellPro and only then would they take a charge at the ''store'' setting. I'm a little bit disappointed at these NEU packs. Actually I'm very disappointed.

Any comments suggesting that the tests are bogus are welcomed :lol:
And please don't take this as a ''cheap lipos are just as good as expensive lipos''. This is not what it's about, I started using this CBA II thingy with the NEU lipos and I was surprised at their performance. So I thought I would try the Turnigys after, being a little bit afraid of what their performance might be. What can explain this? These lipos were used in the same truck, same gearing and settings, same racing and bashing conditions.

What was the C rating on the turnigys & neus?

Suprizing results really, but secretly Im not that suprised, rather happy actually. I believe back in the mists of time it was said that the older neu packs did tend to run warmer and not qive quite as much punch- looking at those graphs, it kinda looks about right (higher IR resulting in lower voltage output). Im no expert on this thing really, just say it as I see it & here it. Would be nice to see a test done with some various other packs like TPs and flightmax & rhino lipos from hobbycity, to see how the bigboys do & to identify the best performing cells/ brand within the hobbycity arena.

All donations to be sent to MC, who will kindly test them and return them afterwards... :lol: :whistle:

First time I hear about the older NEUs running hotter. The NEUs are not that much older than those Turnigys. The C rating was 25C constant for the NEUs and 20C constant for the Turnigys. The NEUs show an IR which is double of what the Turnigys have. That's what I see on my CellPro, I know it doesn't have the most precise way of measuring the IR of each cell but even so, don't need much precision to figure out that there's a big difference between 2.1 and 4.3. I plan on getting some Thunder Power and Hyperion lipos at the end of winter. But it makes no sense to get them now and have them sit for three or four months because I don't use my RCs very much in the snow. In the meantime, if anyone wants me to run their lipos on this thing, sure I will :mdr: I'll send them back with a copy of the test results. :lol: I might get this accessory to go with the CBA II and start puffing the really bad cells :mdr: It lets you test at up to 500 watts continuous. You can test at up to 1000 watts continuous if you use two.

I tested the other pair of Turnigys I have and overlaid the graphs of all four Turnigys. It's pretty consistant.

http://i177.photobucket.com/albums/w..._turnigy_b.jpg

Woo, so the packs are pretty reliable, I'm glad I bought em :]

I'd like Jason from MA see that chart of yours, Rock on HC !!

He should know a lot about these charts, I read a post from him saying that they use the CBA analyzer to test their cells. They would really need to use the amplifiers offered by the same company to test at really high wattage.
The next lipos I'll be analyzing will be a pair of NEU 3900 4S 25C constant and a pair of Zippy H 3500 4S 20C constant.

It's official, I am mad at NEU. Graphs from a pair of NEU 3900 mah 4S 25C constant and graphs from a pair of ZIPPY-H 3500 mah 4S 20C constant. Those lipos have the same age and the same amount of cycles on them. Used in the same truck on mostly a race track. Some of the cycles were for bashing and two cycles each of stop and go running when I was testing that aluminum slipper pad.

NEU 3900 4S #1 (in red)
Discharge rate: 5.90 A
Starting voltage: 16.74 V
Ending Voltage: 12.00 V
Total Time: 36 min. 5 sec.
Tested Capacity: 3545 mah

NEU 3900 4S #2 (in black)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 19 sec.
Tested Capacity: 3470 mah


http://i177.photobucket.com/albums/w..._3900_4s-1.jpg

ZIPPY-H 3500 4S #1 (in black)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 06 sec.
Tested Capacity: 3449 mah

ZIPPY-H 3500 4S #2 (in red)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 17 sec.
Tested Capacity: 3467 mah


http://i177.photobucket.com/albums/w..._h_3500_4s.jpg

And all the graphs overlaid on the same chart.

http://i177.photobucket.com/albums/w..._h_3500_4s.jpg

Zippys hold a higher voltage under the same load and yield about the same run time even though they are 3500 mah. The more I play with this CBA, the more I like Hobby King. I'm anxious to get Hyperions and Thunder Powers to analyze those also. But I am not going to get NEU lipos anymore.

Promising news for HC buyers, like myself :yipi:
As much and strongly as I feel about keeping our money here in the US you can't deny the great deal those HC packs are.

You have any CrapAmps packs to test ??

I wish I did have Maxbull lipos to analyze but I never bought any and I don't wish to either. Next lipos I will analyze will be a pair of Zippy-H 5000 3S 20C constant, the very first lipos I bought. And a pair of Flightmax 3000 5S 20C constant. Those are the ones I accidently plugged in series and ran 10S :lol: They got really hot when that happened but did not puff. They were soft to the touch though so I'm anxious to see how bad they are :mdr: They still run without puffing and give me tons of power.

Damn, and cool, all at the same time... :yes:

Im pretty sure it was the Neus that were said to run hotter than other lipos, but it was a while ago so dont take my rambling as gospel- sure someone else can chime in to either confirm or deny it. Still, I expected the Neus to work better than that- wonder what the newer ones that do higher discharge rates are like?...

I knew these 5S lipos I ran on 10S were a little damaged. But still the result is surprising. One falls a bit short compared to the other but until it does, it holds about the same voltage under load than the other. Pretty good despite what they went through :mdr: Both lipos charge with no problems and all the cells end up perfectly balanced at 4.205 V.

FlightMax 3000 5S #1 (in black)
Discharge rate: 5.90 A
Starting voltage: 20.82 V
Ending Voltage: 15.00 V
Total Time: 27 min. 51 sec.
Tested Capacity: 2736 mah

FlightMax 3000 5S #2 (in red)
Discharge rate: 5.90 A
Starting voltage: 20.85 V
Ending Voltage: 15.00 V
Total Time: 30 min. 27 sec.
Tested Capacity: 2991 mah

http://i177.photobucket.com/albums/w...max_2_3000.jpg

So who's starting to get bored with my graphs :lol:
Here's the result of the pair of Zippy-H 5000 mah 3S 20C constant I have. They are my oldest packs but they are not the ones with the most cycles. Around 20 cycles, I didn't really keep track for those lipos as I use them more for the fun factor they give.

Zippy-H 5000 3S #1 (in red)
Discharge rate: 8.00 A
Starting voltage: 12.47 V
Ending Voltage: 9.00 V
Total Time: 35 min. 04 sec.
Tested Capacity: 4672 mah

Zippy-H 5000 3S #2 (in black)
Discharge rate: 8.00 A
Starting voltage: 12.50 V
Ending Voltage: 9.00 V
Total Time: 35 min. 34 sec.
Tested Capacity: 4738 mah

http://i177.photobucket.com/albums/w..._h_5000_3s.jpg

Last ones I promise :na:

Graph of an old FlightMax 5000 mah 2S 20C.

FlightMax 5000 2S
Discharge rate: 10.00 A
Starting voltage: 8.45 V
Ending Voltage: 6.00 V
Total Time: 27 min. 08 sec.
Tested Capacity: 4517 mah

http://i177.photobucket.com/albums/w...ax_5000_2s.jpg

And to compare a Flightmax with a Turnigy. Same capacity, S count and C rating. Turnigys rock.

http://i177.photobucket.com/albums/w...sus_turnig.jpg

I could look at graphes and comparisons like that all day long and not get bored- its solid gold 100% honest testing that is extremely easy to interpret & understand :yes:

yeah, add to the eagle tree data on the same packs that is floating about and you have mega data!!

too bad the CBA only does 10A right?

It depends on the number of cells you plug into the CBA. It let me test at 10 amps for 2S but would ask me to go down to 5.9 amps for 4S. A Techy could probably answer why. Westmount Radio is the company that makes the CBA. They also make 500 watt amplifiers to use with the CBA. That's 120 amps you could test one cell with. They also talk about a harness to be able to use up to four of those 500 watt amplifiers for a total of 2000 watts so that's like 476 amps is it? :surprised: I hope I'm explaining this the correct way. I kinda read quickly through their description on their site.

Those amplifiers are a bit pricey though at $730.00

I want to play RC with my son
 

Long story here so bare with me. I introduced my little boy to RCs when he was 4 years old. I let him run my nitro Revo one day with the throttle set to 30% on the radio and taught him the basics of driving an RC car. I was surprised at how fast the little bugger learned to turn, brake and in general have a good control of an RC. So I bought him a Losi Mini T. He likes it a lot but it's a little small. He really likes race cars so I am presently rebuilding an old Tamiya TL-01 on road car. He should like this one also but I really want him to be able to play with daddy with big toys, namely Revos. The mini T is too small and the TL-01 is on road so I need to build him an ERevo.
Here's my plan, I have several spare parts for both my nitro Revo (which is not being used lately) and my ERBE. Including complete diffs, tranny, MMM combo, etc. So here's the plan, get a Kershaw Design chassis for my ERBE and whatever is salvaged from my ERBE doing the chassis swap, with stuff from the nitro Revo and the spare parts, make a secong ERBE which would be my son's. I have a couple of Turnigy 4500mAh 2S2P 30C LiFePo4 Packs coming in so it would be a little slower than mine but that would be good. I might still have to adjust the throttle on the radio to make it even slower. A ten pound truck coming at 35 mph might break a five year old boy's bones you know.
What do you think? Good plan? Anyone wnat to buy some nitro stuff? Engines, pipes, glow plugs :lol:

Of course, if I get a Kershaw Design chassis, I would document the swap and post pics in this thread as I always do. And then hope to have some run time to test before the snow comes.

Ray,
Sounds like a great plan, The boy should really love it.

A 10lb MT and anyones bone are a bad combonation at 35mph. Batter safe than sorry with the young lad.

Yes he's very good at controlling his Mini T but an ERBE is very different. I would also gear it so it would go as slow as possible, biggest spur and smallest pinion available. 15 to 18 mph would be plenty until he really gets used to it.

I did it! I just ordered the Kershaw Design LCG chassis. Now I wait... In the meantime, here's a well made movie from jetlag2222 who bought the chassis and installed it, tried it and made a nice review on it.

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EXCELLENT EXCELLENT Build thread. :surprised::great:
By far the best detail with pics, discussion and how to :intello:
I thin k you out did me

Like you I have LST diffs and 6s.
my stock shafts have begun to break

What axle shafts have you gone to, which is the best ?

they resisters measured in ohms...this will ultimately tell us how much they will draw. but they have a wattage rating!! volts goes up, amps comes down, same watts achieved.

All the shafts are good (except Integy) as long as you have a good slipper that is well adjusted to protect them. I tried the stock sliders and the Summit shafts. The sliders snap and twist more easily. The Summit shafts don't snap or twist as easily but every part wears out quicker than the sliders and become full of slop. The sliders die quickly, the Summits die a slow and painfull death :lol: It's all in the slipper from my experience, if you don't have one on your ride, rig one up or stock up on spare shafts.
Once you have a good slipper to protect your drive train, it will be better. But there is no getting around the fact that we run with very powerful power plants. We have ways to prevent the shafts from snapping at every burst of the trigger, but whatever shafts you use, even with a good slipper, they will wear out faster. Especially when using 1/10th scale parts for a 1/5th scale application.

Project GERBE.
 

My son's name is Gabriel. So Gabriel's ERBE will be named ''GERBE'' :smile:

So I started work on GERBE a week ago and basically broke down the build into 5 phases.

Phase 1: Rear end assembled and mounted on chassis.
Phase 2: Front end assembled and mounted on chassis
Phase 3: Tranny, Motor, Slipper mounted on chassis.
Phase 4: Electronics (ESC, servo, receiver, receiver box) mounted on chassis.
Phase 5: Finalizing odds and ends and painting a body.

I got done with phase 3 today. This will be a full blown basher at the lowest speed possible. Spool in the middle, no CD there. High ride height, no sway bars. Turnigy 2S2P LiFe batteries, 68 spur, 17 pinion. The settings of the ESC will be very mild. The speed calculator says a little over 23 mph. I think it is still too fast for a five year old so I will set the transmitter's throttle down to maybe 60%. I'm looking for 15/16 mph. Maybe even less. If a ten pound truck traveling at 15 mph hour hits my boy in the legs, it will hurt but I don't think it will break bones. It could be very dangerous for him if the truck was coming at 40 mph.
For the body, I still don't know what I'll get him. I thought of the Proline Baja Bug but the rear end is weak. Maybe a Proline Slipstream. Or I thought that for a little boy, a real truck body would be cool and he would like it, like the Proline Ford F650 body.

Here's pics of the progress. Nothing new really, it's just a GERBE :mdr:

http://i177.photobucket.com/albums/w.../th_gerbe1.jpg http://i177.photobucket.com/albums/w.../th_gerbe2.jpg http://i177.photobucket.com/albums/w.../th_gerbe3.jpg http://i177.photobucket.com/albums/w.../th_gerbe4.jpg

Haha, neat name...

If you're gonna run a MMM, you can set the throttle limit on the ESC, as I heard doing it on the TX could be bad, but that might just be hearsay

Yup that would be a much better idea thanks.

"GERBE" ? Funny name for those who understand French :lol:

Nice project as usual ! Your son is lucky :yes:

Where did you buy the shrink wrap which protect the motor wires ? I don't manage to find the correct size...

+1, Lucky kid to have a cool ol' bastard for a Dad like you.

Body suggestion if I may, What kid doesn't like a big honking dump truck ?:lol:

I looked at the dump truck and almost went for it. I showed Gabriel some pics of the bodies I was looking at and he liked the big honkin' pick up truck. :smile:

http://www.prolineracing.com/images/...ts/3193-00.jpg

Hope you got me one too ? Nice looking Bod, even the mono color silver looks great !

Thanks Mistercrash this thread offers priceless info

looking at your body choices i was wondering in anyone makes a GMC topkick that will fit the revo,my lil bros are 5 like your son and LOVE transformers,hello ironhide paintjob.--josh

phatmonk you made me smack my computer screen with your avatar. :lol: I like the body too but he surprised me when he picked it, I really thought he would go for that dump truck. Now wheels and tires! Any ideas? Suggestions per chance? Anyone? Anyone? Bueller? Bueller?

well I've been looking at wheels and tires and the choices are numerous. Then I thought it would be nice to stop spending money on this little project (at least for now) and I decided to use a set of new Panther Pythons mounted on Traxxas dish wheels that I already have in my arsenal. The problem I find with this is that dish wheels are boring so I will attempt to dress them up with decals I will print using my laser printer and sticky white vinyl sheets. I put the first design I came up with on a pic of the dish wheels in question. I know it's not as good as the funky cool looking chrome wheels out there but it should be fine for starters.

http://i177.photobucket.com/albums/w...eel_decal1.jpg