Posts

Electric Motorcycle Range (1)

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From Christian Vogler Engineer for concept design and performance for motorcycles "What is the maximum possible driving range of #electricmotorcycles in legislative drive cycles with a certain battery capacity? Here's the answer! And more importantly, do you agree?" I was going through the different speed profiles to test the electric range of an  #electricmotorcycle  in the EU and the USA. And what I found was quite surprising. The cycles show a nearly identical energy demand! With energy demand I mean the energy which is actually needed to propel the vehicle along the speed profile. I did not consider any drivetrain efficiencies and all braking power is considered to be recuperated. Here's the full list of assumptions: 1 - EU drive cycle is a WMTC (part 1, 2 and 3) which is continuously repeated according to EU Reg No 134/2014 2 - US drive cycle is according to SAE J2982 a continuously repeated city cycle and a constant speed test at 70 mph (113 km/h) 3 - As there

Sondors Metacycle: Delayed!

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Honestly think the industry will do anything to keep these either off the street or at numbers so insignificant they wont challenge the ICE world.   Read more at RideApart. Sondors-distributed emails reveal that the Metacycle won’t ship until Q4 2021. The company previously moved deliveries up to Q3 when the project was ahead of schedule. However, recent industry developments have halted the brand’s progress. Sondors cites that the delay is “due to record-breaking demand, industry-wide material shortages, and system-wide shipping delays.” https://www.rideapart.com/news/533903/sondors-metacycle-delay-q4-2021/

MV-QSX8000 (DPX)

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MV-QSX8000 (DPX) is a modification of the MV-DPX from Wuxi Sachi Motors

Voltage Sag - Metacycle/eBike performance

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Voltage Sag - What is it and how does it effect ebike/meta bike performance. Voltage sag is a term used for the result of loading a battery to its full discharge ability and the resulting drop in nominal voltage the battery can sustain. For example in ebikes, in general terms if running a 36 volt battery using standard 18650 cells will have a full charge of 42 volts.  As you ride the battery drains of electrical energy and the voltage drops to a cut off point for the cells usually around 33 volts to 29 volts. This produces an experience for a user of an average voltage above 36 volts. The unfortunate result of course, is that when you start your ride at 42 volts you will experience voltage going down until you stop your ride. This means the top speed and power at the beginning of the ride is much better than at the end. When nearing this cutoff point you will experience a power drop off, loosing climbing ability, speed at full load, and generally degrading performance. The performan

The Apple Car Has A History

2022 KTM 300 XC-W vs Electric KTM Freeride E-XC | Off Road Test

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300cc vs 16Kw. Good commentary on this at 15 min, range, ease of ride, etc. "straight up tell you much lower heart rate, on feel alone... I fee faster on this bike"

15 mile loop

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I've been taking measurements from various battery supplies and EV configurations for around 4 years. The goal is to get a sense of the battery performance on different platforms. It's been very informative. Each platform has its own characteristics for performance and of course uses different amounts of power over the same course of terrain. Some of the bikes reach efficiencies as low as 12 watts per mile, making a 12 AH (~420 watt/hours) battery have a theoretical range of 35 miles. Most interesting is the value of performance of a platform vs. its consumption. Course surface has a big effect on the outcome. So one can say that these applications differ greatly but are all viable for transportation when cost and performance are seriously considered.    chrg, dischrg, watts, time, miles, etc. One example of this is a 3.5 mile course with elevation change of ~900 feet can be completed by the EX1.AWFS(48volts) in 7:30 seconds with an ~speed of 27 miles/hour with a consumption un