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1000 HP dragbike with Ultracapacitors

15344 Views 35 Replies 8 Participants Last post by  Karter2
i want to split out the discussion from the other thread to focus on the technical details of the dragbike project.

Sifting thru their blog pages seems to be the only way to find little bits of info about the details.

Their goal is to do 1/4 mile in 6 seconds at 200 mph, and they call out 1000HP. The electric power supply will come from ultracapacitors, looks like the Ioxus Titan 60 x 108mm axial cells, 2.7/2.85V-2000F, weighing 390 gms each. The drawing indicates 3px210s, so it's ~600V pack (somebody double check my count on that). 630 cells x 390 gms = 540 lbs per dcb.

No word on the motor, but some about the gearbox:
a single speed reduction gearbox, using two sets of 31:59 gears to give an overall ratio of 3.81:1. This reduces the motor's peak speed from 22,000 rpm down to 5,750 rpm, after which a standard motorcycle chain/sprockets set gives us 2.5:1 reduction to the rear-wheel rpm of 2,300.


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Just a couple of points..
Did they clearly statr the pack configuration of 3p, 210s ? Or is that a guess ?
On their facebook page they stated 640 caps in the pack ?..just a estimate ?
How sure are you they are not using the 3000F caps ?

Im not being critical here, just trying to understand why yesterday you were suggesting it would need 22,000 of the 3000F caps to do this, but now it looks like they are a lot closer with <1000 caps ??
Even avoiding the calculations, i dont understand how they dont see the simple fact of the pack weight is a big hint that something is wrong with the basic concept.
No, thats ok Kenny, thanks for the clarification.
I am not too familiar with ultracap powerbanks so i just wondered why the big discrepancy between what we thought would be required conpared to what they are doing.
It still seems as if they are way off in their design thoery, which is even more surprising when you look at who they are working with.
Another tech article on the BYU ultracap EV1..
With the decision made to use ultra capacitors in the race car, design and construction of the storage pack was begun. A preliminary estimate of the energy needs for the race, combined with the maximum voltage rating of the motor and controller, indicated that the car would need a storage pack consisting of 160 capacitors where each capacitor was rated at 2700 farads and 2.5 volts.

The capacitors were connected in series using copper bars for conductors. They were mounted in six sets of twenty-five plus two sets of five. This allowed the use of the original, "T"-shaped battery storage box which came with the EV1.

The capacitor mounting arrangement is illustrated in Figure 1. Students designed the capacitor bank using a solid modeling program and machined the copper bars and ABS plastic structural frames on a computer-controlled milling machine. The completed pack, including the connectors and mounting hardware, weighed 370 lbs compared with 1310 lbs for the original GM lead-acid battery system.
Race weight was 1801 lbs...1/4 mile was 15.94 Using a 400v, 400amp modified EMS controller.
So , max 160kW at the start line , and nothing left at the finish line !
So i guess we have to see how far off the mark the "Fast Charge" system is.
Sounds like they wont make the 6 sec target, but should we start a book to guess what time they get after say, the 3 rd full timed run ? :)
..I will take 9 secs .
The Caps are no advantage,.
Infact a definite disadvantage, in power , size , and weight.
...That is the big mystery .
The capacitors can deliver the power, lipos struggle to provide 2000A
For power you need amps, and volts
Lipo can deliver the 2000amps
Capacitors cannot maintain the voltage
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