V-twin Electric

General Discussion about electric bicycles.
Post Reply
sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

V-twin Electric

Post by sportscarpat » Mar 22 2017 11:19pm

Hi Guys,
I am new around here and am working on a new electric bike with a vintage look. I have been building gas motorized bikes for a few years now under the name Sportsman Flyer. I have developed a few different models based on early motorcycle designs, around 1918 vintage, when motorcycles still had functional pedal cranks. There were many manufacturers back then and I have been careful not to try and copy say an early Indian or Harley. What I have done is to build my own designs based on the common design practices and manufacturing techniques used at that time, while incorporating modern manufacturing methods where it makes sense, at least to me. The basic platform is called a Sportsman Flyer which uses a drop loop style frame where the large loop in the frame down tube allows room for motors, and a single speed reduction unit that shares a pedal crank system like a bicycle. Right side of the bike is the pedal side and the left side is the motor side. I have standardized the various components used on the Flyer to produce pedal only bicycles, and then gas engine packages from 80cc to 250cc.

A typical Flyer bicycle looks like this:

ImageSportsman Pedal Bike by Pat Dolan, on Flickr

A typical Flyer gas bike looks like this:

ImageBonneville Flyer by Pat Dolan, on Flickr

You'll notice the similarities between the two extremes. Both have the same basic frame style, the drop loop, and both closely follow vintage design practices. The pedal bicycle is a cruiser model while the 200cc gas bike is a board track racer.

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Mar 22 2017 11:33pm

The gas bike shown above has my standard reduction drive system I mentioned earlier. It is a single speed design on the motor side with fixed gear ratio. I use a kart racing centrifugal clutch on the engine, and from there feed power back to the reduction unit on the pedal crank, and then power is transmitted to the rear wheel. The basic drive system allows flexability to use various power sources, including electric motors. After kicking around different ideas to add an electric motor to the drop loop frame while keeping the vintage style I like so much I decided to build out a v-twin type case to structurally support the electric motor.

Here is the first motor case I developed for the electric motor.

ImageElectric Flyer by Pat Dolan, on Flickr

And here is the motor case just balanced into a Flyer pedal cruiser to test fit.

ImageElectra Flyer by Pat Dolan, on Flickr

User avatar
MadRhino   100 GW

100 GW
Posts: 7147
Joined: Sep 03 2010 5:28pm
Location: Montreal QC Canada

Re: V-twin Electric

Post by MadRhino » Mar 23 2017 12:03am

Nice work. Those electric flyer frames are calling for a motor. Some ES members did build on them. I hope to see one similar with a soft tail. :wink:
Make it fool-proof, and I will make a better fool.
Current bikes
Street:
Trek Session 10 mod. Variable geometry. 70mph
Dirt:
Santa Cruz V10. 50mph

User avatar
dingoEsride   100 kW

100 kW
Posts: 1124
Joined: Apr 15 2010 2:09am
Location: Perth, Australia
Contact:

Re: V-twin Electric

Post by dingoEsride » Mar 23 2017 12:09am

Looking good,
Gotta love retro classic gasser conversions, does remind me though of the Juicer using Headway cells as cylinder barrels 8)
Attachments
ranger.jpg
ranger.jpg (183.76 KiB) Viewed 4864 times
ride like the wind

User avatar
Lebowski   1 GW

1 GW
Posts: 3395
Joined: Jun 28 2011 1:38am
Location: beautiful Zurich, Switzerland

Re: V-twin Electric

Post by Lebowski » Mar 23 2017 7:43am

Have you thought of, instead of fake cilinders, using 2 RC motors both feeding onto the same big bevel gear (house in the 'crankshaft' housing) ?

User avatar
craiggor   100 W

100 W
Posts: 146
Joined: Jan 30 2015 2:05pm
Location: Bury,U.K.

Re: V-twin Electric

Post by craiggor » Apr 07 2017 5:56am

Batteries fit in the crankcase of the Munro.Image

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Apr 19 2017 5:44pm

Here is the cruiser bike finished up. This was a simple build to test my drive system and it worked as intended. The battery is a 52v 30ah with Big-Block electric motor from Lightning Rods. Can't say enough good things about Lightning Rods. They pretty much specified the big block electric motor, battery, and controller and took the time to educate me on the entire package. The battery resides in the "gas tank", controller is in the tool box, and the motor is mounted in the v-twin crank case.

ImageTesting by Pat Dolan, on Flickr

From there I built out a board track model. This is another standard Sportsman Flyer model where I build basically every component except the rims, hubs, and tires. The same chassis is used for my gas bikes. This bike has the same exact electric drive system as the cruiser then uses a Sportsman Flyer springer fork, seat, handlebars, and disc brakes front and rear. So far the bike has been able to maintain just over 40 mph on flat ground. I cruise at 30 mph. This bike handles beautifully!

ImageSportsman Electraflyer by Pat Dolan, on Flickr

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Jan 18 2018 11:45am

Another cool cruiser build. 52v 30 ah. I used 3" tires on this build and disc brakes. Also has Triumph type motorcycle fenders in aluminum.

ImageSportsman Electraflyer by Pat Dolan, on Flickr

ImageSportsman Electraflyer Cruiser by Pat Dolan, on Flickr

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Jan 18 2018 11:50am

This one is a cool boardie (board track racer). it uses a 72v battery. If I complete it in time it should be at the Grand National Roadster Show in a couple weeks.

ImageSportsman Electraflyer by Pat Dolan, on Flickr

ImageSportsman Electraflyer by Pat Dolan, on Flickr

SlowCo   1 MW

1 MW
Posts: 1604
Joined: Jan 05 2015 5:43pm
Location: The Netherlands

Re: V-twin Electric

Post by SlowCo » Jan 18 2018 1:12pm

8) Beautiful bikes!
Very nice work.

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Jul 07 2018 12:26am


sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Jul 07 2018 12:28am


sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Sep 25 2018 10:54am


windtrader   1 kW

1 kW
Posts: 324
Joined: Mar 08 2014 9:57pm
Location: San Francisco

Re: V-twin Electric

Post by windtrader » Dec 01 2020 1:35am

sportscarpat wrote:
Apr 19 2017 5:44pm
Here is the cruiser bike finished up. This was a simple build to test my drive system and it worked as intended. The battery is a 52v 30ah with Big-Block electric motor from Lightning Rods. Can't say enough good things about Lightning Rods. They pretty much specified the big block electric motor, battery, and controller and took the time to educate me on the entire package. The battery resides in the "gas tank", controller is in the tool box, and the motor is mounted in the v-twin crank case.

ImageTesting by Pat Dolan, on Flickr

From there I built out a board track model. This is another standard Sportsman Flyer model where I build basically every component except the rims, hubs, and tires. The same chassis is used for my gas bikes. This bike has the same exact electric drive system as the cruiser then uses a Sportsman Flyer springer fork, seat, handlebars, and disc brakes front and rear. So far the bike has been able to maintain just over 40 mph on flat ground. I cruise at 30 mph. This bike handles beautifully!

ImageSportsman Electraflyer by Pat Dolan, on Flickr
Hi Pat,
The electrified versions look awesome. Since you have so many options it is difficult to get a sense of the specific components used for these builds. If I may ask a few clarifying questions.

1) The boardtrack model says a standard Flyer model was used. Does that mean the regular Worksman bicycle frame?
2) Are the standard Worksman wheels used? It seems the tires are larger than standard.
3) The forks that look different than the regular springer style.
4) Are drum brakes not advised due to lack of performance so you chose discs?
5) The tank holds the battery, is same except for top access door?

Thanks

User avatar
dogman dan   100 GW

100 GW
Posts: 35825
Joined: May 17 2008 12:53pm
Location: Las Cruces New Mexico USA

Re: V-twin Electric

Post by dogman dan » Dec 01 2020 6:13am

Lovely work. I tended to go for a more, nothing worth stealing here approach, but those bikes are works of art.

999zip999   100 GW

100 GW
Posts: 9882
Joined: Jan 10 2010 1:40pm
Location: Dana Point So. Cal

Re: V-twin Electric

Post by 999zip999 » Dec 01 2020 11:13pm

Wow look at you.
How loud is the big block ?

markz   100 GW

100 GW
Posts: 11996
Joined: Jan 09 2014 11:38pm
Location: Alberta Canada

Re: V-twin Electric

Post by markz » Dec 01 2020 11:18pm

999zip999 wrote:
Dec 01 2020 11:13pm
Wow look at you.
How loud is the big block ?
Speaking of pant shredders, as Borat says "Very Niiiiiiiiiiiiiiiiiiiice"
*No picture of Borat added to detract from nice pics of motorcycles.

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Dec 30 2020 11:45am

Hi Windtrader,
Just now seeing your post and would like to respond to your questions.

1) The boardtrack model says a standard Flyer model was used. Does that mean the regular Worksman bicycle frame?
I have an agreement with Worksman to supply them my standard Flyer frame which uses the rear triangle from the Industrial News Boy frame at 110mm hub spacing. This frame has the drop loop necessary to carry engines and motors. I also make my standard Flyer frame that uses the same front triangle of the frame and then adds my 135mm spaced rear triangle. The frame I currently use on all the electric bikes is the upgraded 135mm frame.

2) Are the standard Worksman wheels used? It seems the tires are larger than standard.
The current electric bike uses disc brakes front and rear laced with 11ga. stainless spokes to Worksman aluminum hoops.

3) The forks that look different than the regular springer style.
I have used my own production internal spring fork with caliper bracket and friction shock on most of my electric builds.

4) Are drum brakes not advised due to lack of performance so you chose discs?
The disc brakes are much better than the drums. I can use disc or drum but most have been disc.

5) The tank holds the battery, is same except for top access door?
The profile of the battery tank is the same as my flat side gas tank but much wider. The battery is accessed through a removable bottom on the tank. Tank is stainless, as is the toolbox which carries the controller.

In regards to the question of noise. The motor runs quiet. What you hear more is the chain drive system.
The bike with the green sheet metal parts, the one I did for So Cal Speed Shop that was displayer at the roadster show, is pretty much stock but did have a few custom features like additional chrome plating.

Thanks,
Pat

sportscarpat   1 mW

1 mW
Posts: 11
Joined: Mar 21 2017 4:15pm
Location: California
Contact:

Re: V-twin Electric

Post by sportscarpat » Dec 30 2020 11:49am

Here is a disc brake front wheel detail and fork detail.

ImageDeep Dish by Pat Dolan, on Flickr

ImageDeep Dish by Pat Dolan, on Flickr

SlowCo   1 MW

1 MW
Posts: 1604
Joined: Jan 05 2015 5:43pm
Location: The Netherlands

Re: V-twin Electric

Post by SlowCo » Dec 30 2020 12:03pm

Beautiful work :thumb:

windtrader   1 kW

1 kW
Posts: 324
Joined: Mar 08 2014 9:57pm
Location: San Francisco

Re: V-twin Electric

Post by windtrader » Jan 16 2021 4:59pm

Hi Pat,
Thanks for the reply. I still want to build a custom e boardtrack racer and the drop look is so perfect to place a motor for mid-drive powerplant.

When I start seriously planning I will contact you via your website and phone to advise on options and ensuring it all goes together in proper sequence and to spec. thanks don

Post Reply