My crack at building the fastest hotrod 9C on the planet...

[liveforphysics]

I've already powered a 9C with a 400A Kelly on 28s Lipo. It blew before the kelly, which is rare.

 

[dnmun]

i used 12AWG solid wire, and it was tight so that is a good job because you got the halls inside their own chafing shield. way cool.

 

[liveforphysics]

i used 12AWG solid wire, and it was tight so that is a good job because you got the halls inside their own chafing shield. way cool.

You can grow the volume of the slot quite a bit.

As you will find, the power output plateaus around 16-17hp if I'm not mistaken. Double input power from there and it only made like 0.5hp more, then a lot of plasma and foul smells.

 

[dogman dan]

Its so fun to melt motors, and 9c, muxus, etc 28mm dd's are cheap enough to fry for the fun of it.

But John is right in one respect, power in that just can't turn into power to the rubber is pointless, except for the pyrotechnic fun of destroying it.

Learning how to shed heat is still a very valid experiment, well worth the cost of a few cheap motors. But you'll get all the heat you need at 3000-4000w for those tests. Maybe keep the watts around 3-4k, but lower amps so you can run 24-30s? I got to 47mph average top speed with 26s myself. The motor would go for awhile, but not all the laps of that particular race. I needed better cooling for sure. I was using the 9x7 winding. I'm sure you can easily see 50 mph with a 10x6.

 

[UBMag]

But it might just be that the copper meets its maker before the 12 gauge

I recall one builder used a lathe and bored the entire length of the axle all the way through. Two phase wires exited one side (or possibly four paired wires for less wasted air space), with one phase wire plus the other small wires out the other side. But I agree 12-Ga should be enough for most of the hot-rodding mods.

"The helpful 9C wire upgrade thread, explicit DIY pictures."
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=24547

Dual-side phase-wires is unfortuanently not an option since the Crogenic needs the other side (but a good idea I need to remember for later).

Yeah, there is that thread that learned me to do the wire upgrade in the first place. I have been looking for that Thanks

i used 12AWG solid wire, and it was tight so that is a good job because you got the halls inside their own chafing shield. way cool.

You can grow the volume of the slot quite a bit.

As you will find, the power output plateaus around 16-17hp if I'm not mistaken. Double input power from there and it only made like 0.5hp more, then a lot of plasma and foul smells.

Used your how2-post, and a bit of "sex lube" from the local porn-shop. haha.. I found it washes of easy and glides silicon like a champ! :lol:
I did not drill the axle on this one, just filed of the ruff parts, so will try bigger cables on the "9Cryo-motor". Also used 24awg, so can probably win the needed space by upping to 30 or 32 awg I guess...

16-17 hp is mechanical force...? In that case topspeed sould not be a big problem with small wheels and high electrical rpm to maximize potential, right?


I will get on with designing the airvents next week. I think I have some kevlar/carbon weave here somewhere to make som scoops... Unfortuanently aerodynamics is not curriculum before next year (will have to check it though).

 

[UBMag]

........Learning how to shed heat is still a very valid experiment, well worth the cost of a few cheap motors. But you'll get all the heat you need at 3000-4000w for those tests. Maybe keep the watts around 3-4k, but lower amps so you can run 24-30s? I got to 47mph average top speed with 26s myself. The motor would go for awhile, but not all the laps of that particular race. I needed better cooling for sure. I was using the 9x7 winding. I'm sure you can easily see 50 mph with a 10x6.

This fits into my experiences to. Did just above 73 kph (about 45mph) on my last motor with a 20s at 40-some amps.. I do not know the winds on these particular ones, but I am guessing its one of the higher ones based on that number of loaded rpm. But as you say, 4000w+ generated more heat than my old air-cooling vents could shedd without cool-down time after 1 - 2 min of WOT.

 

[MadRhino]

If you really want to beat the 9c performance record, you will have to build a water cooling system. I don't know if this was done before with a 9c but it was done on some HS hubs with success.

 

[gogo]

You can grow the volume of the slot quite a bit.

As you will find, the power output plateaus around 16-17hp if I'm not mistaken. Double input power from there and it only made like 0.5hp more, then a lot of plasma and foul smells.

According to your earlier thread, you only got 10 HP out of a Clyte that was larger than a 9C:
Subject: race ebike on dyno, flames and plasma! 40kw IN, 10hp OUT.

 

[liveforphysics]

You can grow the volume of the slot quite a bit.

As you will find, the power output plateaus around 16-17hp if I'm not mistaken. Double input power from there and it only made like 0.5hp more, then a lot of plasma and foul smells.

According to your earlier thread, you only got 10 HP out of a Clyte that was larger than a 9C:
Subject: race ebike on dyno, flames and plasma! 40kw IN, 10hp OUT.

Ahh, yep! 10hp.