The day has arrived!

I arrived at the campsite in the middle of the night. After only 3 hours of sleep, I meet at breakfast all the suntripeurs and Suntripeuses arrived since Thursday. Lots of bikes, all different and original, are parked, ready for departure!

Tonight my bike is sleeping near Clermont-Ferrand!

Like some participants of the SunTrip, I would have liked to arrive by bike on the place of departure (Clermont-Ferrand). But I had to take it by car. And Surprise! On the spot there was another bike already arrived! And not just any bike, because it is the "Tribellule" of Francis Cottard that I could see on the Internet: This vehicle is an adaptation DeFrancis Cottard from the bike oh how mythical of Bernard Cauquil, the Fastest SunTrip 2015!

How much does my solar vehicle weigh?

In recent weeks, various evolutions have altered the mass of my bike: the battery, refurbished to store more energy *, is now a little heavier (its capacity of 9, 6Ah at the origin is passed to now to 28Ah) and on the trailer, I chose not Keep only 4 solar panels instead of the 5 originally planned. I weighed myself, then carrying the bike, and finally, carrying the trailer. Knowing that the weight of the luggage is estimated at 8kg (tent and duvet included), it is up to you to do the calculations from the photos to know:

  • The weight of the bike,
  • The weight of the trailer,
  • The weight of all of my solar vehicle and its pilot.
The cyclist alone
The cyclist and the bike The cyclist and the trailer

The icing on the cake!

I needed to weld two pieces and, given the finesse of these steel parts, my arc welding station was not suitable, it would have melted everything. He is a young mechanic from my neighborhood-retro Performance-who brought all his know-how to make me embarrassed. Let him be thanked! What will be the use of these pieces: even if the departure is in 10 days, I keep hoping to add to my prototype the icing on the cake imagined from the beginning of the project: the possibility of orienting the solar panels in the direction of the sun. This orientation would be carried out on a single axis of course, the axis of the trajectory of the bike, and only the days without wind.

SunTrip 2017

What if the sun is hiding for several days in a row?

I hike quite often in the mountains and fortunately so far I have never had a disastrous weather on a full or two weeks. On the other hand, I've already had gray or rainy days on a few nights. What will happen with our solar bikes if you have 3 days in a row where we cannot recharge the battery? In the middle of the Alps, with passes to cross? Well I guess we'll need good thighs and good calves… In order to avoid this eventuality, I chose to swap my crankset for a MTB pedal, with smaller trays, so. But when I tried to mount a SLX crankset, oddly enough I could not make the settings for each tray to pass correctly. So I entrusted my mount to my bicycle mechanic, gables-on-streets, and he found the solution! The problem is that the joysticks are not necessarily adapted to the draw of the MTB pedals. The solution was to use a very old Shimano RSX 100 type controller. The knowledge and know-how of our Yokohama bicycle shops is irreplaceable!

SunTrip 2017

What budget for this solar bike?

At the time of my registration at SunTrip, I had about 6 months to build and experiment my prototype, which limited the search for partners, and therefore the budget too. I obviously watched the presentation how to turn an electric bike into a solar bike by Bernard Cauquil. I admired his selection of technological solutions. Surely he had hoisted the bar very high. But the cost price of his machine was quite a deterrent to me. Besides, I like the DIY (= do it yourself), I like to be self-sufficient. So, when it was possible, I rather opted for the cheapest solutions, although I knew beforehand that they were not the best. This allowed me to have a vehicle for a reasonable price. The diagram below reflects the cost of the solar bike (out of partnership), it does not take into account the R&D budget that I have difficulty evaluating. The total is below the €3300 bar.

The question of the weight hike…

While hiking, walking or cycling, I learned to pay attention to the weight of my equipment. I learned a lot about ultra-light walking sites (MUL) especially The basic principle: is this equipment indispensable to me? To find the right balance between comfort, safety and lightness. I apply the same principles to bike riding.

For the SunTrip, I knew my bike would be heavier than a normal bike and my choices were often guided by the concern around the weight. The bike I bought weighed 25kg. I managed to reduce his weight to 19.6 kg. How? For example by removing accessories such as the steel luggage rack (1kg alone!), fenders, etc.. and replacing the suspended fork with a rigid carbon fork (2 kg gain).

On the other hand, my new reconditioned battery gained weight: 3.6 kg versus 2.8 kg originally. But that extra weight doesn't upset me. What for? Because it corresponds to an increase in its storage capacity: It goes from 9.6 Ah to 28Ah because the repackaging company offered me to increase the number of cells using all the available space.

A mysterious parcel from Poland!

I received today a parcel that I did not expect anymore… I had to open it to realise that the partnership requested from the manufacturer of my trailer, the producer of the mine, became effective! These are different elements to complete my trailer: a satchel, fixing kneecaps, two neon yellow pennants for the motorists to correctly mark my trailer.

The SunTrip in the "Journal of Saône-et-Loire" of June 20

Last Saturday, I was driving in the Saône-et-Loire. I take a break in Givry, a person is interested in my vehicle, we discuss bike and SunTrip. He asks to take my picture and… I find out he's a reporter in the local newspaper! See the online article "A funny solar steed" in the Saône-et-Loire Journal on June 20, 2017.

Aluminium profiles machined by apprentices of the CFAI 21-71

Today, Elisabeth Dounon sent me the aluminium profiles machined by the apprentices of the CFAI of Châlon-sur-Saône. Thank you to the young, to their Professor Vincent Daka, and to Elisabeth Dounon! (Read more) These parts that support the solar panels allow the two side panels to slide so as to reduce the width of the trailer. I wanted to have the possibility to reduce the width of the trailer mainly for safety reasons, especially for the crossing of the big cities. The idea came to me when I saw the solar bike of the Cazaspe (SunTrip 2015) But my realization is less sophisticated.

An original event that I would gladly participate in

As a road user on a daily basis, as a cyclist, I am particularly sensitive to this event that I would have been happy to participate in. What if we were to organize a similar event locally? Hundreds of cyclists have landed on the Bastille Square to ask for a safer road. Twitter Photo/Yash Obeng. Read the article of 17 June in "Le Journal de Saône-et-Loire"

Loan of pedagogical material by Burgundy renewable energies

For the presentation of the solar bike to classes, I wanted to propose to the students to build models with electric circuits powered by solar energy. It was the Burgundy Renewable Energies Association that lent me material: The pedagogical manager introduced me to the wealth of their resource fund for scientific awareness and experimentation related to new energies. Thanks to B.E.R. ! Loan of pedagogical material by Burgundy… by Stephane-suntrip2017

Exhibition of the educational and extracurricular science challenges of Dijon

< img src = "" alt = "" width = "215" height = "307" style = "float: Left; Margin-right: 10px; " The solar bike was invited to the exhibition of scientific challenges led by classes and centres extracurricular held at the great Orangerie of the Garden of Science, this Wednesday, June 7. The bicycle was the subject of many questions from the children and they understood the reasons for the association of solar panels and an electric bicycle, the circulation of energy in the vehicle, the hybrid nature of its propulsion. On the other hand, the storage battery did not appear to be a necessity for each; A phase of experimental tests could have made it possible to highlight the crucial role of temporary storage of solar energy, by nature so fluctuating. Thank you to the Education Department of the city of Dijon for this invitation!

Hiking in southern Burgundy

Yesterday I rode in Saône-et-Loire between Châlon-sur-Saône and Cluny. Sun on top and big heat! The conditions were met for a solar bike to be at ease. And this was the case, because with a used battery whose autonomy is 15km, I was able to take a 130 km round without worry, the sun recharging it all along the road! What beautiful landscapes in this South Burgundy!

Break at “Pierre au Grain” pond, between Cluny and Saint-Bonnet-de-Joux

Bike presentation at Pignons-sur-Rue store

The gable-on-street cycle shop was my first partner.

I thank Julien Fernandez for believing in my project from the first hour and for advising me with a lot of attention and professionalism. He is the supplier of my electric bike and has given me a discount as part of my participation in Sun Trip 2017. It was therefore logical that the first public presentation of my solar bike be organized at home. This event will take place on Tuesday, May 30, 2017, starting at 6.30 pm, at 17 Rue Général Farouk in Dijon.

For the record, the image of the beginning of this partnership, December 17, 2016.

My Partners

This page was very empty at first, and then as the project progressed, the partnerships gradually developed with different actors in connection with the bicycle, the solar or the technology of materials, up to the support, welcome and unexpected, of an Environmental protection association, the ADEROC.

Meeting with the apprentices of the CFAI of Châlon-sur-Saône

With the prospect of a partnership with the CFAI-21-71, I was today presenting my bike to a group of young apprentices in alternation training. I was asking for their help with the machining of aluminum tubes that support solar panels. As a matter of fact, I had machined aluminum parts for sliding the lateral solar panels to reduce the width of the trailer. But my hand tools do not allow to obtain parts with precise and regular ribs, which leads to hinder or prevent its good fonvtionnement

The process of technical creation of solar bike

Throughout this project of creating a technical object, I was able to realize how complex the process of creation is, because indeed:

  • Many parameters are considered (of the Order of the physics;
  • Some parameters are closely correlated (while others are independent);
  • Some parameters are a personal choice or a preconceived idea, others are simply physical laws (NB: Sometimes it is not easier to lift an obstacle linked to a preconceived idea than another one linked to a physical law).

It is not a linear, but cyclical or rather spiral approach. We go through phases of information retrieval, design, research of the right material. Then come the phases of construction and experimentation. When we do not achieve the expected result, we return to the phases of research, design, construction and again experimentation. Sometimes, after several cycles, we achieve the intended goal, and we are happy! When you do not succeed, you are less… We are then led to question certain starting choices, some parameters. And then the cycle starts again…

First visit to CFAI 21-71 in Dijon

Today, accompanied by Elisabeth Dounon, I visited the training center of the apprentices of the industry in Dijon (CFAI 21-71). For me who loves technology, it was a pleasure to discover their equipment, especially the room dedicated to robotics. Then we considered how the apprentices could be associated with the process of creating the solar bike.

I had already seen this French humanoid robot, Nao, at events around digital education.

Obviously, in the lobby, this sign has taken my attention.

With Kelle Fabrik FabLab, I am learning to program an Arduino

Today, the FabLab Kelle Fabrik organizes a workshop to learn how to program an Arduino module. I was enthusiastic about it. What relationship with the construction of a solar bike, will you object? Well, I had seen that some participants in Suntrip 2013/2015 optimised the recovery of solar energy by orienting their solar panels. So the idea germinated to automate this process and I began to dream that, while pedaling, my panels would orient themselves in a dynamic way according to the Sun. Let us hear well: they would orient themselves along a single axis, that of the trajectory of the bike. And of course, I would activate this automatism only in the absence of wind (I was able to realize that with wind, even weak, the panels had to remain well horizontal).