Search found 64 matches

by SaladFish
Sep 19 2020 5:14pm
Forum: Electric Aircraft
Topic: Exhaust fan on velomobile doubling as propulsion
Replies: 18
Views: 573

Re: Exhaust fan on velomobile doubling as propulsion

If you have a 100w electric exhaust fan at the rear of a velomobile will you get 100w of forward propulsion? The only way that happens is if the blades of the fan are 100% efficient and the motor driving it is 100% efficient. You might get the motor to be around 95% efficient if you are careful in ...
by SaladFish
Sep 15 2020 7:27am
Forum: Electric Aircraft
Topic: Exhaust fan on velomobile doubling as propulsion
Replies: 18
Views: 573

Re: Exhaust fan on velomobile doubling as propulsion

I suspect an “exhaust fan” is design optimised for moving air volume quietly and efficiently, and the generation of maximum thrust is not a priority. If its thrust you want primarily, you would be better off configuring the same power motor with a rpm and propellor purpose designed for maximum thru...
by SaladFish
Sep 14 2020 6:40pm
Forum: Electric Aircraft
Topic: Exhaust fan on velomobile doubling as propulsion
Replies: 18
Views: 573

Exhaust fan on velomobile doubling as propulsion

If you have a 100w electric exhaust fan at the rear of a velomobile will you get 100w of forward propulsion? I remember exhaust fans were used in pedal car races before they were banned because the racers were getting an extra 5-6km top speed from their use. They were using rc airplane motors. I wan...
by SaladFish
Feb 19 2020 1:31am
Forum: General Discussion
Topic: Wondering about potential of plywood velomobile
Replies: 25
Views: 2508

Re: Wondering about potential of plywood velomobile

Stitch and glue tortured plywood is the route I'd go with plywood. Too much flat surface on the sides in the OP's example. I'd get blown all over the road by wind and trucks. When I finally do a velo I'll do a flyweight construction along the lines used by geodesci airolite canoes. The GABoats.com ...
by SaladFish
Feb 18 2020 5:19am
Forum: General Discussion
Topic: Wondering about potential of plywood velomobile
Replies: 25
Views: 2508

Re: Wondering about potential of plywood velomobile

One route people go is a tadpole with a body over the top. The less worrk, the better the chance of completion. What's your background? Are you ready for serious fabrication? Yes I would be welding a tadpole frame then using CNC routing company to produce the plywood body panels that I would then a...
by SaladFish
Feb 18 2020 12:50am
Forum: E-Bike Technical
Topic: Speed limit 25km
Replies: 11
Views: 572

Re: Speed limit 25km

is it against the law to have a street legal/off road switch. street legal is pas only. all it does is turn off the throttle. off road turns on throttle. So that's all it is. When speed it x turn off throttle. So if you could interfere with the signal wire to turn off the throttle in an untraceable...
by SaladFish
Feb 17 2020 10:46pm
Forum: E-Bike Technical
Topic: Speed limit 25km
Replies: 11
Views: 572

Re: Speed limit 25km

Hello A friend of a friend in some country far away asked me to post this question for theoretical reasons. I am interested to know if there is an untraceable way to: Disable 25km limit on a pedlec? Enable throttle? Undetectable? No. Untraceable? Yes. Unless you sign your work, no one is going to b...
by SaladFish
Feb 17 2020 10:11pm
Forum: E-Bike Technical
Topic: Speed limit 25km
Replies: 11
Views: 572

Re: Speed limit 25km

Knowing a bit more about the specific bike in question might help. The bike is theoretical It has an EN15194 compliant motor. Let's say it is this one. https://www.ebay.com.au/itm/26-1000W-Front-Wheel-Electric-Bicycle-Motor-Kit-Conversion-E-Bike-Cycling-Hub/132103004311?epid=21031263222&hash=item1e...
by SaladFish
Feb 17 2020 8:34pm
Forum: General Discussion
Topic: Wondering about potential of plywood velomobile
Replies: 25
Views: 2508

Wondering about potential of plywood velomobile

I was reading tahustvedt's velomobile build thread and what I like about it was how the body was constructed from cnc routed plywood and other parts he assembled or made himself. Very impressive. https://i.imgur.com/HFb4HAi.jpg OJreLisEav0 Project: Home made velomobile design with crank or mid motor...
by SaladFish
Feb 17 2020 7:18pm
Forum: E-Bike Technical
Topic: Speed limit 25km
Replies: 11
Views: 572

Speed limit 25km

Hello A friend of a friend in some country far away asked me to post this question for theoretical reasons. I am interested to know if there is an untraceable way to: Disable 25km limit on a pedlec? Enable throttle? If you were given this ebike you would be unable to determine if this method was use...
by SaladFish
Oct 03 2017 7:30am
Forum: E-Bike Technical
Topic: Limiting power down to legal levels
Replies: 71
Views: 9357

Re: Limiting power down to legal levels

How about using a creatively hidden reed switch to activate full power using a hidden magnet on your person?



Blue tooth activation would also be good. Perhaps a code could be sent by your phone to the controller each time you turn the bike on.
by SaladFish
Sep 29 2017 6:51pm
Forum: E-Bike Technical
Topic: Limiting power down to legal levels
Replies: 71
Views: 9357

Re: Limiting power down to legal levels

i doubt if they would go through all the trouble to have you head down to a dyno testing centre.... They may set a future date that you must go to a dyno, but if thats the case then you would probably have plenty of time to limit your motor. I would think that just slapping a 250W sticker on it wou...
by SaladFish
Sep 29 2017 7:58am
Forum: E-Bike Technical
Topic: Limiting power down to legal levels
Replies: 71
Views: 9357

Re: Limiting power down to legal levels

How can you configure a controller to limit a motor to <200 watts as measured at the rear wheel? That should be pretty easy by programming the current limit to a lower value. Some pretty simple math should tell you what you need depending on your pack voltage. If you program for 200W input to the c...
by SaladFish
Sep 27 2017 6:45pm
Forum: E-Bike Technical
Topic: Limiting power down to legal levels
Replies: 71
Views: 9357

Re: Limiting power down to legal levels

I have looked into this. The compliance is tested by putting the ebike on a special <1000w dyno. If the power as measured at the rear wheel is above 200w (or 250w for that category) then it fails to comply. The fine is Unregistered $659, uninsured $659 and never had a licence (motorcycle license) $7...
by SaladFish
May 23 2017 4:18am
Forum: Motor Technology
Topic: 48V1500W vs 72V1500W
Replies: 4
Views: 957

Re: 48V1500W vs 72V1500W

a "72v" motor will run fine on 48v, but will run slower than it would on 72v. Within reason, you can use whatever voltage you want on any motor to get the speed you want. Controller voltage rating should match your battery voltage. Some controllers can work with a range of voltages. Controller shou...
by SaladFish
Mar 04 2017 8:33pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Your kiddin', right??? No. By such reasoning, bicycles should be freely dispensed by government,... free of registration costs, tire excises, sales tax, inspection fees, even repair costs!!! "We want you healthy! Costs less and you'll be more productive!" If it can be determined that a bicycle will...
by SaladFish
Mar 03 2017 3:26am
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Registration and insurance costs money while bicycle commuting saves money. Taxing someone that saves the government money is counter productive so it won't happen. At least not unless the motoring lobby gains too much power. It is an interesting quirk that it is possible to go 40km per hour with 2...
by SaladFish
Feb 27 2017 8:48pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

just read through the thread, cant see anywhere mentioned how oz cops can test ebikes on the side of the road, in the EN15194 related documents, they give a method for testing ebikes which involves measuring out a distance along the road ( cant remember what it is), riding the ebike full throttle a...
by SaladFish
Feb 23 2017 12:31am
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Tell me this, you got an ebike with a 1000W hub motor in the back. Its completely covered by pannier bags hanging off the rear rack. Your batteries are camoflauged in what looks like a big water bottle, or inside the pannier bags. Your controller is on the top part of the rear rack. You are a civil...
by SaladFish
Feb 22 2017 6:11pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Errr?.. So is it a secret who these dyno testing folk are ?... S&R PRO PERFORMANCE BIKES AND DYNO TUNING When will the authorities do a dyno test on an ebike? Never They just as soon give you a ticket and go on their way to the donut shop. NSW Australia is a anti bicycle nanny state and police have...
by SaladFish
Feb 20 2017 8:51pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Breaking news! I found the company that performed the testing and gave them a call. They mention that they have a dynometer for under 1kw output which would be more accurate than something for a motorcycle. $80 was quoted for testing of an ebike. Peace of mind at only $80, that's pretty good. Here ...
by SaladFish
Oct 25 2016 10:05pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

I've just been down to the local police station and they say the bike is confiscated and tested on a dyno by an engineer and a charge is laid if it is over 200 watt. So 200 watt is at the wheel. From here I need to get access dyno so I can accurately configure an ebike to be under 200 watt at the wh...
by SaladFish
Oct 25 2016 7:19pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Re the OP in this thread... "Police test compliance"? Why, because operator was misbehaving like any "normal" pedestrian or vehicle operator? Just curious... "Driving an unregistered and uninsured vehicle is an offence attracting on the spot infringement notice fines of over $1200 ($607 for being u...
by SaladFish
Oct 21 2016 11:24pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

Re: How do police test compliance of ebike (Australia)

Apparently RMS have in the past used a motorcycle dynomometer to test a pedlec and some petrol power assist bikes for a bogus report. http://roadsafety.transport.nsw.gov.au/downloads/motorised-bicycle-tests.pdf Interestingly they used full throttle on the petrol assist bicycles and gentle pedaling o...
by SaladFish
Oct 14 2016 6:43pm
Forum: E-Bike General Discussion
Topic: How do police test compliance of ebike (Australia)
Replies: 115
Views: 14080

How do police test compliance of ebike (Australia)

I sent the police an email but they are not responding. Can anyone tell me how the police test the compliance of an ebike. Specifically the 200watt limit on throttle only ebikes. Do they put the ebike wheel on a special ebike dyno and actuate the throttle? Do they impound the bike and require you to...