WildManDriving

iTrader: (30)

Hey, did you make or what car are the wheel hubs/diff from?

Maybe less of a dream then first thought,
M.Ellis

M7H

http://serpent.com/product/904002/

YoDog

iTrader: (28)

I made all those parts.
it's a 10mm carbon axle with a standard 48p spur ball diff arrangement. There are few parts on this car that are off the shelf.

fab888

is there anybody driving this Serpent 977e ?
looking for advices for LIPO and Engine as I am very new to Electric , coming from GP
looks like Lipo3S is the battery to order
thxs

jeff_78

Id like to know what serpent recommends for batteries.
need to look for more than just voltage and capacity ok..the C rating is also important.. as a lot of 3S packs have too low such as 20-35C...they prob wont be able deliver enough amps. eg 35C X capacity in Ah = amps.
I think I read 1900kV for motor somewhere, i would agree with that. for 6S.

but just to give you some idea....
currently im using a 966E on 4S 5600mAh 65C and a 2650kV motor. and its going very well.

just using a little math then for 6S to get same performance would be 3750mAh with a 1767kV motor. but aim a bit higher to match nitro for top speed...i think thats the point of going 6S although the response and torque at lower speed is always better with electric...be gentle on the throttle if youre used to nitro.

M7H

The problem with these C ratings is that some of them are not really accurate.
I tested my 966e, converted to suit 6S lipo, and used 6S rhino's of 25-35C, they do the job pretty well!

On 6S you don't need the highest C ratings, because you already have the higher voltage available of 6S.

I tested the 977e, with 2x LRP 4500 / 3S / 40-80C lipo's.
The good thing about them, is the weight, which is 300gr each, so 600gr for 2 lipo's!

This combined with a 1900kv motor, and then a 16 and 17T pinion, will work best in my opinion.

jeff_78

that is true i used 65-80c on 4S i was expecting 40-50 for 6 but...what was the capacity of those 35c packs you used?

M7H

Capacity was 4000mAh.
But this was not enough to get 5 min runtimes.
A later batch of the same Lipo's where a little bigger, and although stated as 4000mAh, after a recharge, I could put back 4300mAh+ in them. Where in the first Lipo I could only put back 3800mAh (which is what you expect from a 4000mAh Lipo)

Please note that these numbers of mAh you can put back in a lipo, doesn't take into account the loss of mA you have during charging. But they do give you a figure about what is going on. Atleast, if you always charge your pack on the same charger.

jeff_78

thanks M7H just one other thing what is the max length of battey to fit in 977E?

M7H

http://serpent.com/news/13781/Design...EP-onroad.html

"Each battery can be 150mm x 50mm x 27mm. Hardcase 3S Lipos fit easy"

But be carefull with softcase lipo's, because the wires take some serious space! (depending ofcourse, where they leave the pack)

M7H

cosmokitten

Please provide link for where to get these LRP 3S lipos.

Based on my limited search, they are either not avail and/or out of stock everywhere...definitely not avail in America.

I found other options but with Deans plugs. Trinity Titanium (50/90C) also just released new 3S wolfpacks (35/65C).

If we can't get our hands on the LRP, any other batt recommendations? I found many other options only to realize that many packs are slightly too large (Revtech 100C for example). My search was limited to 3S packs.

appreciate, thanks!

jeff_78

ive ordered 3S packs from hobby king. 3s 4000mah 40-80c and 320g each i think..138MM long. they are turnigy nano tech packs...these will add up to 88 Wh; slighly more than i have in 966e right now. so i can go slightly faster...
they are about $40 each.
pretty sure they have 4500's too though.

I wasnt going to recommend as i havent obviously got them yet but i always work this stuff out and it usually works on track for me. i wont be pushing it past 110km/h maybe 107ish. we do have a long straight, track is designed for 1/8th but im not a "throttle jiggler" and i dont "nail" it. and lap times are what matters so need a good balance of weight and power available.
Ill let you know how it goes when i get it running.

M7H

I also have nanotechs from them, 4250mAh I believe, but in general a hardcase is much easier and cleaner in wiring.....

But never mind, if they work, they work!

M7H

I think you can get them at any shop which can deliver LRP. But I also can imagine they don't have them on stock, so maybe just send them an email?