[RoughRider]

WOOOW...141kg is realy good...

at the beginning of this thread i thought, that you were just another crazy guy with crazy ideas that will never get to life...

but now i see, that you are a very serious man

GOOD JOB

[__Tango]

Btw. 12 seconds to swap packs. That's great. Do you expect to do that during a TTXGP type race? Will those lost 12 seconds + the slow down/pit speed time make up for the time you have to lay off the throttle?

[Zak650]

Ripperton,

Can you tell me the outside diameter of the motor's bearing on the output shaft? I'd like to drill some cooling holes in the motor without taking it apart.

Thanks,
Zak

[RIPPERTON]

Originally Posted by Zak650

Ripperton,

Can you tell me the outside diameter of the motor's bearing on the output shaft? I'd like to drill some cooling holes in the motor without taking it apart.

Thanks,
Zak

Oh its much more complex than that Zak.
there are webbings in there that you dont want to drill through because you will weaken that face.
drill like this, 12 holes, 3 in each quadrant scribed by lines between each main bolt hole on a 80mm pcd.
Only prob is the bearing retainer plate has such a large diameter it will block most of the air you can get in through the holes. My plate is triangular, has flats cut into it between the 3 bolt holes

[Zak650]

Thanks, Do you have any photos of the inside of the case?
The webs run straight across from the outer mounting holes 180 degrees apart, correct?

[RIPPERTON]

Originally Posted by Zak650

Thanks, Do you have any photos of the inside of the case?
The webs run straight across from the outer mounting holes 180 degrees apart, correct?

3 radial webs 120 apart. the top one is in line with the mount hole near the phase cables

[Zak650]

Hi Ripperton,

Thanks for all your help and the information you have provided in this thread.

Do you have any power figures that you can provide to show what you have been able to wring out of one of these double stack motors? Have you ever put your bike on a dyno?

Thanks

[RIPPERTON]

Zak havnt dynoed the bike yet but 164v x 600A = 98.4 kW at the controller minus 10% motor losses = 88.5kW wheel power.

the angle of the dangle = 12 degrees
adjusted the lean angle of the pack when supported by the pullout handle.

[RIPPERTON]

working on the fitment of the pack when in the bike.
I want the pack to slide out easily also when the bike is laying on its side.
ie if the pack goes into meltdown whilst being ridden, the rider parks the bike in the gravel trap and drops it on its side then pulls the pack out onto the gravel then the marshals can hit the pack with powder and the rider wheels the bike over to the tire wall.



This alloy trim is the bottom wall of the air dam. the other 3 walls are on the pack. plastic fly screen is clamped between the trim and the cradle.

[major]

Originally Posted by RIPPERTON

working on the fitment of the pack when in the bike.

Hi Ripper,

I like what you're doing However I am not convinced that a battery swap makes sense in the TTXGP brand of racing. I've been to all the US TTXGP events and haven't seen a venue where I think an advantage would be realized.

Now the opposite is true for another EV race with which I am involved. The kart race was 100 laps with many turns. We had about 8 kWh total battery by rule. We used split pack. During the race, swapped battery in 7 seconds

I also was involved with the Formula Lightning series back in the 90's. We were required to make battery exchange pit stops during most of the races. This was with Pb-Acid and the total on-board battery pack was about 1200 pounds. We were able to get the actual exchange time during race conditions down to about 17 seconds.

So I have some experience with battery exchange systems. Here are a couple of things I notice with your design. Containment in the vehicle should withstand crash conditions. I think this is about 8 g's. And the electric disconnect system needs to be spring loaded. It appears you use aluminum for the contacts. That will be trouble. I'd go with copper, silver or at least tin plated.

Just some of my observations. I've seen battery packs detach from vehicles during races and have seen fires result from disconnect failures

major