thatsut

hello all I though you may be intrested in a project i have been working on for over a year, which is based on a dream to see the world…

Thus I invented the Brrompton™ © to enable such dreams.

please see photos for explanation.

Total mileage, stopped counting at a 1000,
Top speed, too fast for a responsible adult (≥28)
Weight, around 20kg
Range (with engine tank), 23-35 miles
Range (with one gallon tank and engine tank), 138-205 miles
Pedal assistance is required
Max climbing angle, with BWR I’ve had no problems
Max one day tour, over 120 miles

I have also tailored the other aspects of the bicycle outside the engine etc design, some I changed and then some I change back. It took time to get to a point where I realised changing anything else would be a detrimental. Ill just wait for 349 mm off road tyres until then its walking , which is plesent dont forget people.

(Additionally: this work is my intellectual property and any financial gains from this will go to a charity of the invertor’s choice )

And most importantly “ a ride on my Brrompton™ © makes me smile”

Any questions feel free to ask.

kind regards,

Chop!

Hi Thatsut

Wow! A very strange way to do this! Surely all that weight makes it handle like a blancmange! LOL! I appreciate that you can still fold it with the motor in situ. Is that a three speed hub that you are running it through? And what is that on the handlebar? It looks like a small torch pointing skywards!
All very intriguing. Hope it stops better than my Brompton BTW!

Anyway, good luck with your unusual project!

Safe Brrromptoning!

thatsut

brakemeister

I absolutely love the engineering part of the bike ...

switching front and rear wheel .... what a good idea... than again if your rear is broke and you switch the front what you gonna use in the front ?...lol but nethertheless awesome

thor

thatsut

Thanks Thor,

"I absolutely love the engineering part of the bike ..." thanks much aprcieated, once again from a indivual who has im sure is rather knowledgeable of folding bikes. In the past ive had many jobs i used to work as a engineer, was fun and puts me in a postion to make educated choices regarding safety which is very important on a project like this.

"than again if your rear is broke and you switch the front what you gonna use in the front ?" its more about rim wear, ive read these small wheels to be more robust than larger vesions so i hope/suspect broken wheels to be unlikey.

Thanks again

thatsut

210 views two comments.. did i offend some bromtoneers? really i keep telling myself its only a slight change

Foldable Two

See quite a few motorized bicycles running around the beach area here in Ventura. No converted folders, though.

Most seem to go plenty fast; not sure how well they can stop.

Questions: What size is the engine? What is it's horsepower rating?

Lou

thatsut

the bore of the engine is 35cc, physically is very small. smaller than the 16" wheel. It is problably has the best compactnessto weight to power ratio that would be needed for a bicycle IMO.

Ps i seen a few folding motorized bicycle, which are "friction drive" ( no gearbox, no chain, just a "scrubber"/round peice of tube rotateing the whell through friction) not to be compared to chains or belt drive.

the horse power is 1.6 or one lance armstrong

ps what is this so many veiws so few comments I've been waiting ages to post this.

Foldable Two

Likely because you are "marrying" two opposing viewpoints: The internal combustion engine and the human powered bicycle.

{I remember "motor bikes" from the 1950's. Typically, kids who couldn't afford motorcycles, or were too young to run them on the street, and had the mechanical where-with-all, would build them.}

Lou

jur

I think it is quite clever!! Excellent engineering and inventing skills. Very good, the way you integrated it with the fold.

chucky

Oh I disagree. The human biomass has excellent weight to power ratio, especially when you consider that:
1. You need to bring your body along anyway.
2. The weight to power ratio will improve as your muscles get leaner from riding your bike.

+1

mike alanko

On the other hand, electric power.

Foldable Two

Nice bike for sure, but likely about the same price as a well-equipped, small car?

thatsut

Hello there everyone!

in my opinion its not apposing ideas. as i see it as transport. bike shops sell car racks for bikes, I doubt they even consider the ideas contradictory? just a frame of mind i surpose. Each to there own!!

IMO this is better than a motorcycle. (for me!!!!) because i can ride like normal bike,take on train, fold into car, relatively very fuel effcient, and other cool things i cant think of just now

JUR thanks for the comments and thanks for all your general posts ( i really liked reading your offroad adventure on the down tube mini i think )

Hi chucky,

in response to you comments i have something that might intrest you
"Oh I disagree. The human biomass has excellent weight to power ratio, especially when you consider that:
1. You need to bring your body along anyway.
2. The weight to power ratio will improve as your muscles get leaner from riding your bike."

ok my power out put is 400 watts steady lets say i weight 80 kgs ratio = 4watts for every 1 kilo.

so.. my power 400watts + 800watts total weight 90 kgs = 13watts for every 1 kilo

thus i conclude the brrompton to be 3 times the P/W ratio of the non motorised, sorry to bring out the maths out (force of habit being engineer) . obviously its not that simple, but intresting to consider nonetheless? Do you not think this concept would be more readliy avaiable if it was more economically profitable to big businesses, considering the amount of running cost and initial costs in cars?

mike thanks for the image, yes i know miles project had done for some time know. funny you should post that as i asked him for a race the other day.

any way, i think she needs a name any ideas?

king regards,

nathan

porschetoyz

thatsut:

I wanted to show some support for what I consider to be a nice application to motorizing a bicycle. I would like to do something similar later this spring. Maybe to a folding Montegue bike or, as you did, to a Brompton. I like that the Brompton 'fold' has not been compromised, even if the resulting package is a 'little' unwieldy. Nice work.

mike alanko:
Can you point me to a tread, or site, with more information on this electric Moulton? A couple quick searches did not result in nada. Thanks.

chucky

Ok true, but I'm sure you can build a full motorcycle with an even "better" power to weight ratio. And for what? To put yourself and those around you in more danger?

I think Einstein had it right when he said "a perfection of means and a confusion of aims seems to be our main problem".

porschetoyz

Found it. Not electric Moulton (or variations), just eMoulton.

thatsut

Thanks porshetoyz

hi chucky, thats a great quote !!(Two thumbs up )

next time your in wales i shop you just how fun it is to ride! "dont worry be happy"

ps porschetoyz go to endless sphere .com for the moulton project the owner seems a very nice chap and has documanted the whole process.

ps this is my new theme tune on th loooong rides https://www.youtube.com/watch?v=rMbATaj7Il8

safe and happy riding all!

danoulz

I love the engineering / problem solving that went into that project, well done !!!!
I DIY'ed my electric Brompton but the end-result is a Human-Powered-Vehicle with assistance for the hills (or for carrying heavy weights)...it is intentionally not designed to be used as a moped: approximately 400W peak power (250W continuous at 36V), 15mph maximum assisted speed.
The Brompton is without a doubt the best-folding bike (nothing folds as small whilst retaining the ride qualities of a larger bicycle), so it's nice to see all sorts of modifications for it
Cheers, Dan

thatsut

Dan,

Thanks for the compliment . I also tryied a diy electric brompton but was rather disappoited. If i was do it agian electric i'd use a crank drive version with a ping pack.

There is nothing wrong with human power it is what i prefer! and having something for the hill makes lots of sense. The one thing i didnt like about thhe bike is at the start i was rather fit, but got lazy using the motor only. then i realised i was becoming less fit thus only use the motor on them loooong rides

cheers,

Nathan

thatsut

hi gents & gals,

Would like some help in a name for my bike.

was thinking something along the lines of.... Ekahau.... "mayan god of Travellers", but is not very catchy but symbolically the mayan walked the longest from africa thus respect is due.

or ....hawk... because i often see birds of prey when I out riding my bike in th middle of nowhere and i think they are similar to the type of tourer i am e.g. solo, independant also free as a bird

anyway any better ideas remember I'd like it to mean something. Thanks

mlau

I'm sort of late to the post, but I have to say...WOW!

As for a good name...you can probably name it whatever you want and get away with it.
After all that engineering, it can even be "Sue."

megavovan

Good job!
Yes, you can call it Sue