Timma2500 wrote:The 10s lipos turned up today, sweet! However they did have a surprise in store - each pack had 4 discharge leads! I assumed they would just have two but HK split the packs in two 5s halves, on the pack i tested it arrived with 19.13v / 19.12v. Its no biggy, just means extra wiring i hadn't anticipated.
It's no biggy, just plug them into series and forget about the extra loop of wiring - the only real hassle is extending/joining the 5S balance tap leads. If you're trying to save space inside your frame I'd actually open the top of the shrink wrap and solder a short stub of wire from one 5S +ve to the other 5S -ve to create a permamant 10S pack. HK only does it like this for people who don't have 10S chargers and need to charge the pack in 2 halves on less say 6S chargers
For the wire mod i took the easy way out - took the seal out and just cable tied (zip tied) the wiring to the axle.
That's what I do an have no no issues with it.
Almost couldn't have placed them more perfectly behind the disc spokes if i'd tried! I don't know if this will have any consequence in regards to cooling effectiveness but it sure hides them well!
Yeah I'm not sure if that's good or bad for cooling but if you want to hide them you've done well
Ok so i've got a decision to make as to whether i'll bother making the frame to carry 10 or 15ah - 4 or 6 lipo packs. I'll be riding this bike mostly with my girlfriend once i get her Mac build finished. Given she's reasonably new to mountainbiking in general (but picking it up pretty quick), our average speed will prob only be about 25-30kph
The HTs are really efficient at this speed - 10ah pack will get you heaps of range - probably in the order of 40-50km depending on how you ride and the terrain. Given your sweet frame it'd be nice to keep the bike looking as close to stock as possible and not have a triple wide tank section if you can help it. If your GF is also into riding dirt bikes with you (which she is right ?) then it won't be long until she feels the need for speed and 25km/hr on the mac won't cut it
Thats 65deg at the windings, not the casing hey? If so thats pretty good going, from what i've read about safe winding temps i'd be happy with that!
You'd need good cooling to get 65 on the windings with your planned power. 65 on the side covers is about 90 at the windings - which is hot but still OK. Personally I'm not keen on taking it much over 100 but with drilled side covers that shouldn't be too much of an issue.
I've still got a nice normal mtb but its just not the same without a few kw to help get my speed jollies!
Damn straight, it's like riding up hill, through thick mud
sn0wchyld wrote:Riding the other day, after a series of hill climbs and general mucking round with very little pedalling I did get the motor temps to 75 (and yea, the probe is glued to the windings with some thermal cement, so thats winding temps). measured the cooling rate to 55deg, and it was averaging about 1 deg every 10 seconds.
That's really good - it'll last forever at that rate. Time to up the current and push your luck