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Old 12-30-2008, 09:48 AM   #61
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Yes 43mm will allow 5000/40C+

Our goal is to have a packs that will fit most popular cars. I know it's impossible to have a pack that will fit all all cars but trying to make one fit as many as possible is what we need to do.
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Old 12-30-2008, 03:58 PM   #62
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43mm will work on my MBX5R conversion. Not sure on the MBX6 yet. I'm still waiting on Dan at RCPD for the MBX6 conversion kit.
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Old 12-30-2008, 09:03 PM   #63
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Danny I wouldn't be real worried on the height yet. Someone will always release a body that is 2-3mm taller on the sides to fit batteries.

J concept, Proline where are you????????????????????
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Old 01-01-2009, 10:02 AM   #64
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Jconcepts said they'll make a D8 conversion body as soon as HB releases a conversion kit for it. That really sucks! I'm sure some company will open their eyes and fill this niche pretty soon. Just add a few mm's height to ALL the different makes of 1/8 bodies they sell and call it there e-line of 1/8 bodies??????

Will you make these as soft packs first? How tall will those be? thanks
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Old 01-01-2009, 10:07 AM   #65
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Yes were releasing a softcase pack first. It will be 35 x 45 x 160
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Old 01-01-2009, 10:25 AM   #66
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Yes were releasing a softcase pack first. It will be 35 x 45 x 160
Perfect! I really like your 4900 saddle packs. Can't wait to try these.
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Old 01-01-2009, 11:01 AM   #67
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Dan,

RC Pro just released their 1/8th electric rules for 2009. They are allowing 5S and 6S packs as well as soft packs, but they did agree on the 10 minute mains like ROAR. If I were a battery company I would be seriously looking at making some lower capacity 35-40C + packs.

For a 10 minute race the most you'll ever need is 13 minutes of run time (10 minutes of racing, 2-3 practice laps and the final lap after the 10:00 clock runs out). They also set the minimum weight at the same 7 lbs, 0.9 oz's as ROAR (3200 grams). Most competitive racers are going to want enough capacity to make those 12-13 minutes with enough leftover so they are not over-discharging their packs but also be at minimum spec weight. More efficient setups use between 200-250mah per minute. These will slowly weed out the high amp drawing high KV motors that some run. If there even is any advantage to having more power I can actually see guys using the hotter motors for the short 5-7 minute qualifiers and then switching out the motor to a more efficient lower KV motor to run in the mains.

I'm curious as to how much capacity you can stick in a 138L x 48W x 40H (this small case would fit in ANYTHING) hard case? I'm thinking a lot of racers are going to want 3200-3300mah packs or 4000-4200mah packs.
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Old 01-01-2009, 05:41 PM   #68
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Originally Posted by TonysScrews View Post
Dan,

RC Pro just released their 1/8th electric rules for 2009. They are allowing 5S and 6S packs as well as soft packs, but they did agree on the 10 minute mains like ROAR. If I were a battery company I would be seriously looking at making some lower capacity 35-40C + packs.

For a 10 minute race the most you'll ever need is 13 minutes of run time (10 minutes of racing, 2-3 practice laps and the final lap after the 10:00 clock runs out). They also set the minimum weight at the same 7 lbs, 0.9 oz's as ROAR (3200 grams). Most competitive racers are going to want enough capacity to make those 12-13 minutes with enough leftover so they are not over-discharging their packs but also be at minimum spec weight. More efficient setups use between 200-250mah per minute. These will slowly weed out the high amp drawing high KV motors that some run. If there even is any advantage to having more power I can actually see guys using the hotter motors for the short 5-7 minute qualifiers and then switching out the motor to a more efficient lower KV motor to run in the mains.

I'm curious as to how much capacity you can stick in a 138L x 48W x 40H (this small case would fit in ANYTHING) hard case? I'm thinking a lot of racers are going to want 3200-3300mah packs or 4000-4200mah packs.
many of your points are exactly why the min weight should be about 7.5lbs. guys running lower capacity packs because of weight, switching out motors so those light packs can go 10 minutes. yes people will push the envelope and packs will go bad a lot faster because of it. not to mention the manufacturers will start making either expensive exotic parts or they will get more fragile because of leaning out the materials thickness. all of these problems can be fixed for free by just raising the min weight.
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Old 01-01-2009, 07:18 PM   #69
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Minimum weight at the same 7 lbs, 0.9 oz's as ROAR (3200 grams)
I think that is the lightest you can be.....It is the same for 1/8th Nitro.
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Old 01-01-2009, 07:58 PM   #70
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many of your points are exactly why the min weight should be about 7.5lbs. guys running lower capacity packs because of weight, switching out motors so those light packs can go 10 minutes. yes people will push the envelope and packs will go bad a lot faster because of it. not to mention the manufacturers will start making either expensive exotic parts or they will get more fragile because of leaning out the materials thickness. all of these problems can be fixed for free by just raising the min weight.
I don't agree. Let's say my 1512 2.5D uses 225mah per minute. That is 2,925mah for a 13 minute run. To ensure longer pack life and performance you should try not to exceed 80% capacity. So that would mean I need a 3,656mah pack.

If I didn't run any practice laps maybe I'd only need 11 minutes, or 2,475mah. at 80% that is a 3,094mah pack. So a lighter 3200-3300mah pack would be all I'd ever need. The pack would last a long time, never get over discharged or heat up. My 4S 4000mah soft pack weighs 455 grams and that is due to the extra wiring since it's two 2S packs wired in series. The Poly RC 30C 3200mah 4S pack only weighs 344 grams so I'd imagine a 40C pack in a hard case might weigh around 375 grams.

Jhautz's and Edumakated's XB808's with a 375 gram pack would easily make 7 lbs flat. They might actually fall under 7 lbs. My MBX5R with the heavier RCPD ultimate tray, 455 gram pack and a 47 gram seperate Rx pack with the porky MMM weighs in at 7 lbs 13.5 oz's. The MBX6 out of the box is 10.5 oz's lighter than the MBX5R. Add the Titanium turnbuckles, aluminum axle shafts and center joints and it's almost a full pound lighter. I know if I use a lighter ESC and battery tray in my MBX6 I'm building it is going to be in the 6 lb 12-15 oz's range with a 375 gram battery and seperate Rx LiPo pack. The newer cars are a LOT lighter and there is no need to cut weight out of the aluminum chassis's or run too small a pack.
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Old 01-02-2009, 08:49 AM   #71
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i hear 2 or 3 people on here that say their car is about 7lbs. then i hear the other 30+ like me that have cars around 8 or a little more with the popular 4s 5000 pack.
from what i remember someone just posted that their new mbx6 with some added dremeling was just under 8lbs. i have weighed several no frills race ready cars, most were the losi 8 and the lightest was one that had the losi conversion, a medusa 36 60 motor, mamba max esc and micro pin tires. with all of these lighter options it was 7.9 lbs.
i will ask again. why do some people want to take a class that has great car durability and turn it into a fragile, less reliable money pit class?
heck from what i have seen getting a car to 7.5lbs with a 4000 pack would be difficult enough.
i know the xray is a really light chassis but from what i have seen no nitro guys are adding extra weight to get to 7.09. every car i have ever weighed has been about 1/2 a pound heavier or more in electric form vs nitro with a safe 5000 pack. and yes i have checked my scale several times against my local post offices re zeroed scales and it is within 10gms every time.
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Old 01-02-2009, 09:00 AM   #72
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I agree with you that I don't want to see the cars built more fragile. I'm 100% ok with the stock aluminum nitro chassis (although I'd like to have one with only the holes I need in it) . Closing up the flywheel hole would help strengthen the nitro chassis's.

I will weigh my MBX6 when I get it done with my 455 gram 4000mah 4S pack (two 2S1P packs in series) and then I'll post the pics here. I'm pretty confident it will be close to 7 lbs flat.

Older cars will definitely be heavier in this class as they are in the nitro class. Nitro guys running the XB808, MP9 and MBX6 will all have about 1/2 lb to 3/4 lb advantage on guys runinng the older XB8, MP777WC, MBX5R and other heavier cars. The brushless systems seem to have no issue ripping around these cars when they weigh 8-1/2 lbs. But having a lighter car will help improve efficiency, handling (balance) and improve run time. The ESC and motor will likely run cooler too since it has a lighter load on it.
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Old 01-02-2009, 09:19 AM   #73
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I think I'm missing something.... that is the minimum weight not the max. Why is everyone acting like they have to shave weight??? Just run what you have, if you have to $$ to lighten your car do it. It not going to decide the winner........
Here are the rules right from the RC Pro Series page.

1/8 Electric Buggy




Minimum track width - continuous 10 feet


Maximum Buggy length – 28.74in. (730mm)
Maximum Buggy width – 12.20in. (310mm)
Maximum Buggy height – 9.84in. (250mm)
Buggy wheel base - Minimum – 10.8in. (270mm) Maximum – 13.2in. (330mm)
Minimum weight - 112.88 ounces (3.2 kilos) 7lbs .05 oz.


Wheel diameter - Minimum – 3.2in. (81.28) Maximum – 3.54in. (90.0mm)

Wheel mounting - Must be securely mounted at all times.
Maximum wheel width – 1.98in.(50.45mm)
Tire diameter - Minimum - 4.3in.(109.22mm) Maximum - 4.7in.(119.38mm)
Maximum tire width – 2.03in.(51.59mm)

Motor – Brushless no limitation. Sensored or sensorless.

Batteries – 4S, 5S or 6S lipo. No MAH limit. Batteries must be in good physical shape no cut, damaged or swollen pack allowed. Hard cases not required. Batteries must be secured properly in the vehicle, strapped or clamped into place before the event begins.

Charging – Batteries MUST be charged in a charging sack specifically designed and marketed for the purpose of charging lipos.

Transmission - 1 speed only
Rear suspension - Independent
Bodies - Buggy or other off-road style body that resembles an actual off-road racing vehicle
Tires - Rubber only




Main events – Triple A Mains @ 10minutes. Lower mains 10 minutes

Notes - Maximum height is measured with suspension fully compressed.
Electric buggies may not run with the Nitro buggies.
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Old 01-02-2009, 09:30 AM   #74
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I think I'm missing something.... that is the minimum weight not the max. Why is everyone acting like they have to shave weight??? Just run what you have, if you have to $$ to lighten your car do it. It not going to decide the winner........
You're absolutely right!

What I think kvrc is trying to get at is he thinks Mfg's will build a 1/10th 4WD style plastic/graphite chassis to cut more weight for these 1/8th scale kits. My point to him is that we can make the cars under min spec with the aluminum nitro chassis's we're using today so I don't think we'll see it happen. We'll have to get the ready to race weight on a few of the newer updated kits converted to prove whether or not they actually are near 7 lbs though. I think they will be and I don't think he does..hee-hee

We're not having an arguement though (if that's what you or anyone else thought).
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Old 01-02-2009, 01:11 PM   #75
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i know that the losi 8 isnt the absolute lightest thing around but it is a pretty light car. from my experience weighing at least 5 of them all no frills with 4s 5000 packs they weighed in at 7.9 the lightest with the losi kit and the rest are 8.1 to 8.2 lbs. these are also the kind of numbers i get from other guys that have similar light cars.
even with a lighter 4s 4000pack in those cars they would only be about 100 gms or 3.5 oz lighter. that would take them down to about 7.7 at the lightest and 7.9 to 8.0 for the rest.
look back about 3 or 4 pages in the 1/8 scale thread dj1978 started. a guy there posted about his mbx6 car weighing in at 7.99 lbs.
and yes you are right on the money if companies build around 7.09 as the min. we will have a bunch of less reliable or more expensive 1/8 buggies.
for any of the guys that will be racing at washtenaw tomorrow if you want i will weigh your cars and log some results if you want.
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