Search found 38 matches

by gerhardt
Jul 10 2017 11:10pm
Forum: Polls & Surveys
Topic: What is your favorite 500W-3000W Direct Drive Hub Motor?
Replies: 39
Views: 14540

Re: What is your favorite 500W-3000W Direct Drive Hub Motor?

I use the Crystalyte 404/408 motor with a 2 speed winding on my trike to test Segway 74 volt batteries. The Crystalyte has performed flawlessly. It has handled 2000 watts for 5 years without problems. Thanks Kenny for a very nice motor.
Don Gerhardt
by gerhardt
Dec 13 2009 1:49pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 5000W Goldenmotor build
Replies: 5
Views: 2294

Re: 5000W Goldenmotor build

Hi ebiker, You have a nice e-bike in Germany. What speed can you go up a 10 % grade? Do you have a method to measure volts and amps? I currently use a 404/408 two speed hub motor at 72 volts with a 35 amp controller in a 20 inch front wheel in my Safety E-Trike. I need better performance going up hi...
by gerhardt
Dec 12 2009 11:18pm
Forum: E-Vehicles General Discussion
Topic: Goldenmotor Hub Motor
Replies: 3
Views: 840

Re: Goldenmotor Hub Motor

My friend sent me an e-mail today asking about the possibility of using 2 or 4 of the Golden Motor HPM5000B motors and related components for a car project. I would appreciate any information on this motor and the company. I am also checking the old posts for information.
Don Gerhardt
by gerhardt
Nov 05 2009 10:45am
Forum: E-Bike Build Threads / Photos & Video
Topic: Enclosed Tricycle
Replies: 29
Views: 10747

Re: Enclosed Tricycle

Thanks jmygann for the link to the Aminda Vollta electric trike. I sent an e-mail to the Aminda Foundation to find out more about the design kit for high school student design teams. I belong to the non profit Electric Automobile Association and our local chapter TEVA promotes electric vehicle proje...
by gerhardt
Nov 05 2009 10:16am
Forum: E-Bike General Discussion
Topic: How many watts can you safely feed a 9c?
Replies: 16
Views: 1174

Re: How many watts can you safely feed a 9c?

Thanks for all the comments on the 9c motor. I use a Crystalyte 404/408 two speed front hub motor in a front 20 inch wheel at 72 volts with a 35 amp controller. I can operate at 35 mph on level grades. I have been able to operate at over 2200 watts without any problem so far. I failed my previous 20...
by gerhardt
Oct 31 2009 7:08pm
Forum: Battery Technology
Topic: Advanced Battery Technologies, Inc.
Replies: 2
Views: 461

Re: Advanced Battery Technologies, Inc.

Hi, Advanced Battery Technologies had a booth at the Interbike International 2009 Expo in Las Vegas during Sept. 2009. Their web site is http://www.AEenergy.com. Does anyone have any experience with this company or their batteries? They make both LiFePo4 and Li(Ni-Co-Mn)O2 batteries. I am interested...
by gerhardt
Oct 30 2009 11:22pm
Forum: E-Bike General Discussion
Topic: Beta tests sold as products
Replies: 42
Views: 3814

Re: Beta tests sold as products

Hi Morgan, Thanks for an excellent video. I am from North Carolina. I heard about you from Jack Martin at the NC TEVA chapter of the Electric Car Association. I have been testing motors, batteries and controllers in NC for over three years in attempt to find durable and reliabile components for my S...
by gerhardt
Oct 13 2009 10:50pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Enclosed Tricycle
Replies: 29
Views: 10747

Re: Enclosed Tricycle

Thanks for the video of your enclosed delta trike. Your trike looks like a very practical vehicle. I am currently designing an enclosure for my delta E-trike. I added lean wheels in the front to limit the lean angle to 10 degrees. I have a roll bar and side impact bars.
Don Gerhardt
by gerhardt
Oct 13 2009 10:30pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Series AC Induction Trike
Replies: 38
Views: 10731

Re: Series AC Induction Trike

Jason, Thanks for sharing the build photos of your beautiful trike. 1. I notice that you plan to use Maxwell super capacitors. If you want I can send you a paper from MIT on using super capacitors for an electric go cart. 2. Is it possible to use a standard 1 HP AC motor and over power it to save we...
by gerhardt
Sep 16 2009 10:47pm
Forum: E-Bike General Discussion
Topic: Enclosed trike / Velomobile dream
Replies: 85
Views: 28424

Re: Enclosed trike / Velomobile dream

Hi Swbluto, I am designing a Safety Delta E-Trike that may meet some of your requirements. I attached a photo of the chassis. I am currently designing an aerodynamic enclosed body for the trike. The pedals drive a jackshaft with a chain to a Nexus 8 speed hub in the LH rear wheel. There are a total ...
by gerhardt
Sep 01 2009 11:32am
Forum: E-Bike General Discussion
Topic: Helmet Camera, or Onboard Camera
Replies: 39
Views: 2253

Re: Helmet Camera, or Onboard Camera

I doubt if the silicone sleeve for the Creative VADO HD is waterproof since there are openings for the lens, LCD, microphone, speaker and connections. The switches are covered. I am sure the sleeve helps in a light rain. There were no instructions for the sleeve. It was in the box with the camera. I...
by gerhardt
Aug 31 2009 10:41pm
Forum: E-Bike General Discussion
Topic: Too much rubber kind of tires?
Replies: 3
Views: 471

Re: Too much rubber kind of tires?

I have been using the Maxis Hookworm 26x2.50 rear and 20x1.95 front with heavy duty tubes on my delta E-trike with great results. I operate up to 35 mph with no flats. I read where the Maxis Hookworm was tested to 90 mph in the UK on a bike towed by a Porsche car. Maxis also makes motorcycle tires s...
by gerhardt
Aug 31 2009 10:30pm
Forum: E-Bike General Discussion
Topic: Helmet Camera, or Onboard Camera
Replies: 39
Views: 2253

Re: Helmet Camera, or Onboard Camera

I mounted the Creative Vado HD and the Oregon Scientific ATC2K AT18 video cams on my E-trike. A photo of the installation is attached. I tested the ability to read a vehicle license plate. The Creative Vado HD (1280x720) can read the license plate number at 10 and 25 feet but not 50 feet. The Oregon...
by gerhardt
Aug 31 2009 9:14pm
Forum: E-Bike General Discussion
Topic: Watch yer back. Bike rider killed by drunk.
Replies: 37
Views: 1540

Re: Watch yer back. Bike rider killed by drunk.

Hi John, How fast do you ride? I like to keep up with the flow of traffic, however I don't like to ride faster than 35 mph. It would be interesting to find out how fast the drunk lady was going when she hit the bike. I believe I can design a safety E-Trike that can prevent an injury from a rear impa...
by gerhardt
Aug 30 2009 12:18pm
Forum: E-Bike Technical
Topic: Ventilating a hub (fluid dynamics advice request)
Replies: 18
Views: 2000

Re: Ventilating a hub (fluid dynamics advice request)

Hi John, You may be able to make a small smoke wand or bubble wand to track the airflow. We used these devices to monitor cooling airflow on designs that were too complex or expensive to model with fluid dynamic models. Let me know if you find a small wireless temperature sensor that can be used ins...
by gerhardt
Aug 29 2009 11:11pm
Forum: E-Bike General Discussion
Topic: Helmet Camera, or Onboard Camera
Replies: 39
Views: 2253

Re: Helmet Camera, or Onboard Camera

I just purchased 2 small video cams from Amazon to mount on the roll bar on my Safety Delta E-Trike. I plan to use the Creative Vado HD ($99.99) aimed forward and the Oregon Scientific Model AT18 ($59.99) aimed rearward. I may be able to use a mirror to get side shots at the same time. I may have to...
by gerhardt
Aug 29 2009 11:14am
Forum: E-Bike General Discussion
Topic: Sheldon Brown's 63 Speed
Replies: 4
Views: 420

Re: Sheldon Brown's 63 Speed

Hi, I have 168 speeds in my Safety Delta E-Trike. The gear inches range from 15 to 200. The wide range of gears and 404/408 72 volt two speed front hub motor allows for a fun and leisurely ride at 35 mph. The low gear range is nice if you want to carry 100 lbs of groceries and tow a trailer up a hil...
by gerhardt
Aug 25 2009 3:07pm
Forum: E-Bike Technical
Topic: Who uses CREE MC-E led's for your headlights?
Replies: 11
Views: 1546

Re: Who uses CREE MC-E led's for your headlights?

The Oct. 2009 issue of Car and Driver has a photo on page 30 of the LED headlights for the 2010 Audi R8. The twin high beams on each side have four LEDs their arrays. The single low beam generator uses 14 LEDs focused through three lenses. The LEDs are cooled by fans to keep the temperature below 30...
by gerhardt
Aug 15 2009 11:31pm
Forum: E-Bike Technical
Topic: Who uses CREE MC-E led's for your headlights?
Replies: 11
Views: 1546

Re: Who uses CREE MC-E led's for your headlights?

Thanks,
I plan to order 2 of the R-2 12v LED modules. I tried to place the order but PayPal keeps asking for my bank account number. I want to pay PayPal with a credit card. I don't trust PayPal with bank account numbers. Were you able to pay PayPal with a credit card?
Don Gerhardt
by gerhardt
Aug 15 2009 2:12pm
Forum: E-Bike Technical
Topic: Who uses CREE MC-E led's for your headlights?
Replies: 11
Views: 1546

Re: Who uses CREE MC-E led's for your headlights?

Hi Patriot, I am interested in using the Cree MC-E or something brighter for headlights on my E-Trike. I have considered using 5 watt halogen bulbs. I want to mount them in a scooter headlight housing. I attached a photo of the headlight housing. The opening in the housing for the headlights is 19 m...
by gerhardt
Aug 13 2009 9:17am
Forum: E-Bike General Discussion
Topic: Winston-Salem Police fail to cite driver who hit biker
Replies: 28
Views: 1401

Re: Winston-Salem Police fail to cite driver who hit biker

Travis,
I do not know if the driver's insurance paid for medical costs and damage to the bike. I will ask Bruce the next time I see him. I should see Bruce within 30 days.
Don Gerhardt
by gerhardt
Aug 11 2009 8:56pm
Forum: E-Bike General Discussion
Topic: Winston-Salem Police fail to cite driver who hit biker
Replies: 28
Views: 1401

Winston-Salem Police fail to cite driver who hit biker

Bruce Hermann owns a bicycle shop in North Carolina that specializes in recumbents and E-bikes. Bruce was hit from behind at 35 mph by a motorist who failed to slow down. Bruce was not at fault and had lights and the required safety equipment on his bike. Bruce was in a coma for 3 weeks and was not ...
by gerhardt
Aug 11 2009 9:54am
Forum: E-Bike General Discussion
Topic: Ping LiFePO4 batteries vs Ebikes.ca nicad (72 v)
Replies: 10
Views: 816

Re: Ping LiFePO4 batteries vs Ebikes.ca nicad (72 v)

Hi pwbset, Thanks for you reply. I assume you are operationg your 400 series hub motor at 72 volts. Over 2kw means that your were using at least 28 amps with the 20 amp controller. I would also see a peak of 28 amps with the 20 amp controller. A capacitor exploded in my 20 amp Crystalyte controller....
by gerhardt
Aug 10 2009 10:56pm
Forum: E-Bike General Discussion
Topic: Ping LiFePO4 batteries vs Ebikes.ca nicad (72 v)
Replies: 10
Views: 816

Re: Ping LiFePO4 batteries vs Ebikes.ca nicad (72 v)

Hi Sid, Have you considered the two speed 400 series hub motor instead of the 500 series? I use the two speed 400 series with a 72V-35A controller. My top speed is 35 mph. My Safety E-Trike weighs 100 lbs. and I weigh 200 lbs. The trike is designed to carry an additional 100 lbs of cargo. My max cur...
by gerhardt
Jul 29 2009 10:20am
Forum: E-Bike General Discussion
Topic: Spun front axle and flew over the bars @ 25mph
Replies: 159
Views: 13860

Re: Spun front axle and flew over the bars @ 25mph

Hi Doc, Thanks for your interest in my Safety E-trike. The trike has two roll bars. The lower rollbar is 36 inches high and is welded into the frame structure. The upper rollbar is 48 inches high. The upper rollbar is removable to allow the trike to be transported in a minivan. The upper rollbar is ...