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Old 12-12-2008, 07:06 PM   #16
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The dimensions (L170mm X W48.5mm) I posted above are for the RC Product Designs Ultimate Battery Tray.

Link (scroll down half way to see the trays installed in the buggy)
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Old 12-12-2008, 07:15 PM   #17
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Thanks for the info.

Height is 43mm with regular bodies ?

Would you say most cars will use this tray or have the same room to fit a pack with that size ?

Why I need to know is that we will put the best possible capacity and C rate in that size. Cell tooling is 1000.00 so I don't want to screw it up.
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Old 12-12-2008, 07:39 PM   #18
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43mm will fit the Losi 8 and the Associated RC8 and the Kyosho 777 With the RCPD kit battery on the left side.
It will also fit the Losi tray.
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Old 12-12-2008, 08:44 PM   #19
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I would not make the packs 170mm in length. There are only a few tray designs that will accomodate that size cell. The Mfg's will likely make battery trays that will fit the packs specified by the ROAR rules. I would use 160mm as the maximum length, 48mm as the maximum width and then keep the packs 42mm or under in height.
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Old 12-12-2008, 09:03 PM   #20
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I'm currently using the RC-Monster battery tray in my RC8. The tray is 45mm wide by 168 mm long. I can fit up to a Poly RC 4S 6000 mAh battery that is 163x47x43 is size. It fits fine without pushing up the body. I would say that is an upper limit on the size of packs you'd want to make, Danny. But, that length of pack won't fit in some of the conversions out there. I'd personally like to see some 5S or 6S packs of that size or shorter (height), especially if you can keep the size down even with a hardcase shell.

I volunteer to test any packs for you Danny! Badassrevo can testify to how much rip my e-RC8 already has, and that I do not have a light throttle finger. I soooo want to test out 5S and 6S setups. Already have the motors, just hestiant to spend the cash on new batteries, just to see how I like them.

Already have your 2S hardcase saddle pack for my B44, can't wait to see how it runs too.
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Old 12-12-2008, 09:27 PM   #21
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For 5S and 6S the height will have to be higher than 43mm as you need to add cells. If you want to keep the height at 43mm you will need to drop the capacity. I will talk with our supplier to see what kind of capacity is possible with a 5S and 6S using cells that won't be higher than 43mm.

We will release a flight pack with 6S/5000/40C the size will be 160 x w 44 x h 54 The cells used in this pack is 8.5 in height. So a 4S pack would be 37 in height and 45.5 for a 5S pack. I believe we will release this pack as a 4S pack and if we need a hardcase version it would add 1.5mm for the case thickness.
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Old 12-13-2008, 07:15 AM   #22
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As for pack mah, I still say 5000mah in 4S not because of nitro race times, but because I have managed to dump packs on tracks here in under 15 minutes that were almost 5000mah (the 4900mah enerlands, 4S) and was using the conservative Neu 1512 2.5d motor when I did. I would want a pack that could consistently make 10 minutes with alittle left over.

The 4900mah Enerland based back fit excellent in my MBX5 and didn't have any height issues on 4S. I think this pack would be excellent for a 4S hardcased lipo option.
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Old 12-13-2008, 08:37 AM   #23
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Perhaps we can help Dan out by providing the inside dimensions of the following available trays:

Associated Tray: (Dan, email Richard Saxton for this as the car is in prototype phase right now)
Caster Racing Tray:
Losi Tray:
Novak Tray:
RC Monster Standard Tray:
RC Monster Long Tray:
RC Product Designs Standard Tray:
RC Product Designs Long Tray:
RC Product Designs Ultimate Tray:
Tekno RC Tray:

If I missed any, sorry, just add them. Please fill in the blanks if you know the exact measurements. I'll get the numbers off the RCPD trays later this afternoon.
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Old 12-14-2008, 10:20 AM   #24
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Thanks for thew info guys. I think the easiest thing to release will be a 4S pack using the same 5000/40C+ cells we will use in our 6S flight pack. The pack will come with 10 gauge wire and will not be in a hardcase. We will study the market and see what we will do for a hardcase.
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Old 12-14-2008, 11:50 AM   #25
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I would like to see a hardcase 4s +5000mah for under $150 with the dimensions of two 2s packs...
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Old 12-14-2008, 11:57 AM   #26
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The size of what two 2S packs ? As far as pricing goes our packs will never be cheap as we use the best possible materials in our packs. These materials aren't cheap but they improve performance and cycle life. From what I have heard an 8th scale buggy is pretty hard on the packs so you need to buy high quality packs to get the cycle life.

3D Helicopter flying is one of the most demanding use for Lipos and reports indicate that our packs have 2 - 4 times better cycle life. So this needs to be considered when shopping for Lipos. There are cheaper packs out there but most of the time you will not get the high cycle life from them as they use cheaper materials to keep the price down.
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Old 12-14-2008, 12:11 PM   #27
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Danny, I'm waiting for ROAR to release a rule set and then I plan on building a electric 1/8th buggy. Like you I just can't get into the nitro for various reasons. If the size of it fits in the Losi & AE trays I think that's what would be the accepted by most racers. I plan purchasing a setup that allows me to run 18-20 min so I can compete easily in the club's 15 min heats.

I think you are smart by not going with a hard case until final rules are published. Save the overhead expenses for use another day.
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Old 12-14-2008, 12:23 PM   #28
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Several of the battery trays are fit for 2 2s packs and most people are weary of converting due to the expensive packs. MM made it possible to have an ESC and motor for app. $300.
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Old 12-14-2008, 01:21 PM   #29
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We already have 2 types of hardcase packs for those who can use 2 of these to make a 4S setup.

We have the 5000/28C/7.4 with a 129.95 Street price and we have the 5200/24C/7.4 with a 84.95 street price.

Like I said there are plenty of cheap Lipo packs out there but you need to be careful as some of them will have a poor cycle life.
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Old 12-14-2008, 08:38 PM   #30
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My 4s soft packs are 152mm long x 44mm wide x 30mm tall.

Danny you ROCK!!!!!!!!! Thanks again for looking out for use E-8 guys.
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