Search found 1767 matches

by billvon
Mar 19 2019 12:51pm
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 10
Views: 196

Re: Boeing 737 Max 8 failures..an explanation ?

IMO, if you need to be in autopilot during climb out to be stable, that's a bit too unstable a design for an airline. Well, the problem only occurs during sudden increases in engine power, or steep turns at high power settings - neither of which happens during normal climbout. I'm not saying no fly...
by billvon
Mar 19 2019 12:48pm
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 10
Views: 196

Re: Boeing 737 Max 8 failures..an explanation ?

The best analysis I've seen is pointing to a lack of basic piloting skills which leads to not disengaging the autopilot then manually trimming the plane when there is a runaway trim. Those aren't basic pilot skills. In any emergency, a pilot has three primary jobs: Aviate Navigate Communicate Those...
by billvon
Mar 19 2019 12:38pm
Forum: E-Bike General Discussion
Topic: Is it bad to constantly plug in and lightly drain a battery?
Replies: 14
Views: 167

Re: Is it bad to constantly plug in and lightly drain a battery?

I'm hoping to start doing more deliveries per day by just keeping the battery topped up as much as possible. I'm generally limited in deliveries by battery capacity(range). I end up completely killing the battery every day and having to charge at night. I didn't know that faster charging might be a...
by billvon
Mar 19 2019 12:33pm
Forum: E-Bike General Discussion
Topic: Is it bad to constantly plug in and lightly drain a battery?
Replies: 14
Views: 167

Re: Is it bad to constantly plug in and lightly drain a battery?

In your use, you need the thing to be full as much as possible of the time, regardless of the way keeping it full affects cell lifespan. This is not like a solar house system, where it might be worth it to never let charge completely full. What you need is as much capacity as you can get at times, ...
by billvon
Mar 19 2019 9:11am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

From the love of RE and the money spent on wind/solar/batteries in South Australia, I am willing to bet that if it was possible, in any way possible, to build a hydroelectric dam no matter how much money it would cost, South Australia would build one, they just don't have the water. Yep. Fortunatel...
by billvon
Mar 18 2019 11:21pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

It simply an acronym . The reasons for the objection can be many. Right. But the objection is that it is too close to them, not any other reason. That's what makes them NIMBYs. Someone who hates Wal-Mart, thinks they sell cheap Chinese crap and thinks they pay peanuts, is not a NIMBY if they object...
by billvon
Mar 18 2019 10:45pm
Forum: E-Vehicles General Discussion
Topic: Is there a way to charge my scooter when I am on the road?
Replies: 5
Views: 83

Re: Is there a way to charge my scooter when I am on the road?

Vaporizing2019 wrote:
Mar 18 2019 12:51pm
I don't live in a big city and have to drive through rural area where there is no power outlet. :(
You sure about that? I have found outlets in very unusual places.
by billvon
Mar 18 2019 6:19pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

But that is not a universal view. As with any "survey" it depends on how the question is phrased and who you ask. Most of the general public know very little about wind power, because they do not live near it and their only view of it is on a TV screen. Of course. NIMBYs are everywhere. Whenever yo...
by billvon
Mar 18 2019 5:09pm
Forum: E-Bike General Discussion
Topic: Is it bad to constantly plug in and lightly drain a battery?
Replies: 14
Views: 167

Re: Is it bad to constantly plug in and lightly drain a battery?

I use my ebike for delivery. Is it bad for the battery if I were to go on a delivery of a few miles, return home, plug in the battery, and unplug it again in 20 minutes and do another delivery? What kind of battery? Lead acid? They love being kept as close to full charge as possible. Lithium ion? B...
by billvon
Mar 18 2019 4:08pm
Forum: Battery Technology
Topic: Solar Charger Controller as an alt. to the Cycle Satiator?
Replies: 7
Views: 561

Re: Solar Charger Controller as an alt. to the Cycle Satiator?

So in my quest of cheapness, I already ordered a few of those Meanwell chargers from the other thread as a means of slow charging my 48v packs. However, I recently discovered this device: MPT-7210A MPPT Solar Charge Controller For about $35 it looks like it takes in any voltage above 12V and then b...
by billvon
Mar 18 2019 3:54pm
Forum: General Discussion
Topic: using voltage sag as indication of bad battery
Replies: 11
Views: 160

Re: using voltage sag as indication of bad battery

it wouldn't be monitoring for remaining life but more so integrating into the program the drop in capacity and subsequent voltage drop at full discharge. Most BMSes with a "remaining capacity" display do a form of coulomb counting to gauge remaining capacity; it's generally easier and faster than a...
by billvon
Mar 18 2019 3:23pm
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 10
Views: 196

Re: Boeing 737 Max 8 failures..an explanation ?

I agree that better software can partially compensate for some of the other problems. An aircraft is a system and all the components have to work together as a system. Many high performance aircraft are so aerodynamically unstable they need computers just to stay in the air. Definitely. It's also w...
by billvon
Mar 18 2019 3:20pm
Forum: General Discussion
Topic: using voltage sag as indication of bad battery
Replies: 11
Views: 160

Re: using voltage sag as indication of bad battery

it seems a simple program (to someone who doesn't know how to program). If it were to work it would save space, time, money possibly replacing a bms if it were good enough, no? No. The primary reason you need a BMS on a li-ion battery is to monitor for cell imbalance, not for remaining life. what h...
by billvon
Mar 18 2019 3:05pm
Forum: Motor Technology
Topic: Building an AC Motor
Replies: 2
Views: 88

Re: Building an AC Motor

Do you think it is possible and economically wise to build an AC motor for your own car? Possible? Not unless you have years of experience building high efficiency high power AC motors. Economical? Not unless you have your own machine shop with a lot of spare parts hanging around (bearings, wire, s...
by billvon
Mar 18 2019 2:10pm
Forum: Alternative Energy
Topic: Energy storage
Replies: 4
Views: 166

Re: Energy storage

But think, doesn't it make more sense to store the energy at a temp closest to it's use. Not for A/C systems. They need a more significant temperature difference for effective cooling. But for things like refrigerators (maintaining one constant temperature, with one level of heat flow in and out) t...
by billvon
Mar 18 2019 1:58pm
Forum: E-Bike Technical
Topic: seperate regen braking system?
Replies: 4
Views: 140

Re: seperate regen braking system?

do they exsist for brushless hub motors? Sure. Any brushless direct drive hub motor can be a generator. You can either use the existing functionality in the controller or build a regen-only circuit. A very simple way to do it is to use 3 H-bridges to short all phases simultaneously and periodically...
by billvon
Mar 18 2019 10:26am
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 10
Views: 196

Re: Boeing 737 Max 8 failures..an explanation ?

I'd say there was a software problem as well. During the LionAir accident, one AoA sensor was reading normally and the other one was reading way too high. Intelligent software could have cross checked with airspeed, vertical speed, bank angle and engine setting and determined that one sensor was bad...
by billvon
Mar 17 2019 11:05pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Irrespective of how ferile or useful the land may be, im sure you are well aware the main objections ( not mine ) to Wind farms are "Environmental" ! In particular is "Visual" and Audio pollution , and to a lesser extent the physical disruption of the area... Those aren't environmental; they are hu...
by billvon
Mar 15 2019 2:23pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

.... Snowtown occupies 0.29 km2 and has a nameplate capacity of 370 MW. So a 1 GW wind farm will occupy about 1 km2. It's got a solid 40% CF, so lets be generous and call it 3 km2. And also states that the "swept area" of the farms turbines is ...0.29 km2 !!! :shock: Coincidence ?? Yeah that's what...
by billvon
Mar 15 2019 1:09pm
Forum: E-Bike Technical
Topic: Calculating Battery Life based on voltage
Replies: 12
Views: 198

Re: Calculating Battery Life based on voltage

I'm running a 60 volt battery on my e bike, and fully charged it's about 67 volts. My battery meter does read in percentage but it also reads out the battery voltage, and I think I would prefer to calculate my range based on that. Does anyone know how I could calculate the amount of watt hours left...
by billvon
Mar 14 2019 11:20pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

If Regulatory Authorities ever pull their fingers out and do a little work, you would probably be able to buy a "Plug and Play". Nuclear generator from Amazon . :wink: (With free delivery on Prime !) Perhaps. Of course, you could say the same thing about solar. Get rid of the bureaucrats and the re...
by billvon
Mar 14 2019 2:08pm
Forum: Battery Technology
Topic: capacitor lipo hybrid. did i predict the future again?
Replies: 11
Views: 350

Re: capacitor lipo hybrid. did i predict the future again?

Every lithium battery you've ever used is already intrensically a super capacitor in parallel with an electrochemical cell. Well, it's a capacitor, at least. And I would add that pretty much every battery - every battery that has parallel plates with a small amount of electrolyte between them, whic...
by billvon
Mar 14 2019 1:28pm
Forum: Alternative Energy
Topic: Energy storage
Replies: 4
Views: 166

Re: Energy storage

unklegrumpknee wrote:
Mar 14 2019 8:29am
Using this system one can use off peak power for air conditioning at a time when the outside temperature is less getting more " Cold for the buck"
Google Ice Bear. It's on the market now.
by billvon
Mar 13 2019 11:08am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3514
Views: 124590

Re: Wind and Solar vs Coal, Gasoline, Nuclear

What would have happend if Germany would decide to stop building more RE and invest in nuclear power reactors instead? Nothing. It will take around 20 years from the idea to build new nuclear power plants to have them generating electricity in the modern western world. Yep. We should do both. Short...
by billvon
Mar 12 2019 5:03pm
Forum: General Discussion
Topic: Protect yourself while trying to develop/market a tool
Replies: 6
Views: 205

Re: Protect yourself while trying to develop/market a tool

As the title says, how does one go about this? We have designed an ingenious and simple tool and want to receive royalties, IF possible, and have someone make and market this tool. 1) Get a patent. They are not cheap or foolproof but they're the best show in town right now. 2) Get investment capita...