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Posted by flylowfast | Oct 01, 2012 @ 02:05 PM | 1,589 Views
Today the postman brought me a second hand Skyangel MIG-15 I bought on an auction site.
The previous owner had fitted a 10A 3s ESC and a Thunder Power 3s 25C-50C battery.
It also came with a 6 channels Spektrum receiver. The servo wires were soldered to the the receiver since the first 3 or 4 channels had all the pins cut or broken. Anyway, I cannot use it since I don't have (and don't plan to get) a Spektrum transmitter.
So, I desoldered all the servo wires from the receiver and put the receiver away.
The plane was pretty beat up but since I got it at a good price I didn't mind too much.
I'll use it as a "beater" plane with no regrets.

I also did a first step towards "repairing" the damaged Turnigy 9x transmitter (see this post).
With a Chinese dremel, I cut some plastic protrusions created by the melted batteries. Some of them stood inside the battery compartment making impossible putting batteries in it.
See the attached pictures.
Posted by flylowfast | Sep 23, 2012 @ 02:16 PM | 1,499 Views
Today (Sept. 23rd 2012) I did a lot of soldering (at least for me).
In the morning I soldered several connectors together an ESC to a motor, I changed the connector of my T-28 Trojan from a Deans connector to a XT60, etc. (see the first two pictures).
The fourth item from the left is an adapter for the Turnigy 9x transmitter to be able to use a 3s LiPo (see my previous blog entry to find out why I needed that).

Unfortunately I discovered that the 4 adapters from the JST connector were wrong in the sense that I put males instead of females and vice versa.
One of the motor wires broke and also one of the wired of the 3s LiPo adapter.
I also decided to put 0.8mm bullet connectors on the motor and ESC wires to avoid other wire breaking.
So I needed to redo all of them except for the T-28 Trojan connector.

During the afternoon I did just that (see the third picture).
The bullet connectors are much more practical, mechanically solid and they are also light enough that they can be used with this motor and ESC (which will go into a 50-100g plane).
Posted by flylowfast | Sep 23, 2012 @ 01:59 PM | 1,774 Views
Yesterday (Sept. 22nd 2012) I accidentally wrecked a Turnigy 9X transmitter by overcharging its NiMH batteries.

Usually I leave the 8 NiMH batteries in the transmitter and charge them from time to time by plugging a 12V supply in the charging connector of the transmitter.
This charges the batteries over several hours.

Yesterday I plugged by mistake my netbook supply which supplies 2A at 20V instead of 12V.
The NiMH batteries overcharged and started to boil inside the transmitter.
I was next to them but unfortunately I had my headphones on so I only heard them "boiling" when it was too late. They make small "pop" sounds and other sounds similar to boiling water (but at lower intensity).

When I realized what happened, I disconnected the transmitter from the supply and put it in the bath tub. Then, I removed the back "hatch" which was very soft because of the heat and took out the hot boiling batteries using a pair of scissors to pry them out (I couldn't touch them).

I left the transmitter in the bath tub for a while face up so that the whatever boiled would flow downward and not towards the transmitter electronics.

Today I took some pictures of the damage (see attached pictures).

Even though at least one of the batteries melted its way through the plastic, nothing seemed to have contaminated the PCB.
I tested the transmitter using a 3s LiPo battery and everything works well.

The worst part is that...Continue Reading
Posted by flylowfast | Aug 16, 2012 @ 12:47 PM | 2,571 Views
I acquired a tiny video camera on aliexpress.com with the purpose of mounting it on my head.
Here is the mount made from EPS foam (see picture).
Obviously, the end goal is to be able to make video of my RC flights easily and without needing someone else to hold a camera.
The videos and pictures of tiny camera are much worse in quality than those of the compact camera I used so far. But the angle of view is larger, specified at 60 deg. so that should be enough to keep the plane in the image, which was quite difficult with the other camera.
I'll soon have the opportunity to test how well it works.