Last weekend we borrowed a sewing machine to make new curtains for the apartment. When I was sewing the curtains I realized that It wouldn’t be very difficult to make a custom battery bag for my e-bike. I would like a bag that I could mount in the frame triangle and have room for 4 Turnigy 6S 5Ah batteries. Doing some measurements, calculations and drawing I came up with this design
I went to the fabric store and found a black nylon fabric that had a PVC layer on one side. This should be fairly water resistant and I plan to spray it with some textile waterproofing spray as well. I was recommended to use a thread for furniture which is much stronger than ordinary thread as well. A couple of hours thinking, cutting, and sewing later:
The bag fits perfect on the bike!
Pleas write a comment if you think I should make some kind of drawing and description on how to make a bag like this.
In a comment on the post about my first Depron RC-plane I was asked for the plans. I’m afraid I don’t have the nice 1:1 print on multiple A4 plans that most people are used to, but if someone have a good guide on how I create those kinds of prints I’ll be happy to create one. But for now I can provide the drawing with measurements.
No posts for a couple of days since I’ve been busy with other things. As you may have noticed, to this point, I have only written about some old projects I’ve done in the past. There is some catching up to do but I will mix old projects with new stuff until all my old projects are well documented here (at least the interesting ones).
Here are a list of projects I will try to write all little about in the near future.
One more Depron RC aircraft. (SAAB J-35 Draken)
More about my quadrocopter
At least two electric bikes, one MTB and one Puch Maxi Moped conversion
Electronics for electric bikes, controller and motor modifications, BMU, DC/DC converter, LED-lights…
Mechanics for electric bikes, motor mount, battery box…
Maybe some pure programming projects for either Android, Windows or the web
This will be my first project post on this blog starting with something I made a year ago. A RC aircraft made out of depron.
Depron is a foam material intended for insulation and sound dampening of floors. I bought a 10-pack of 6 mm and a 10-pack of 3 mm at Hornbach, a local hardware store, which will be enough for several planes. At this store the foam was actually called Ebisol instead of Depron, but I guess those are just two different brands of the same stuff.
There are thousands of freely available plans for such a model only a google search away but I had to design my own. Some time behind a CAD program I ended up with this.
If I were to build this model again i would definitively make some changes to the plans. Some parts of the model were very hard to assemble due to their complex shapes.
A couple of evenings of assembly and some inspections from the chief engineer
The model were done.
Almost all parts I used for this were bought from Hobby King
Apart from this i bought some carbon rods and some piano wire from a local RC store.
The only thing left to do were the test flight
That was the end of that aircraft. I’ve heard people say that the center of gravity was off making the plane unstable. I believe Murphy was trying to teach me a lesson that I should try to walk before I run. Maybe I should have used one of the existing plans known to work with a well defined spot for center of gravity.
As I said this was a year ago. Two weeks ago I visited Aeroseum which is an aircraft museum here in Gothenburg. By now my emotional wounds, from seeing hours of work crashing to the ground, have healed and i feel ready to make a new try.
More about that in a future post…