heliblog

heliblog

RC Helicopter flying, RC Cars and RC boating

Made for other people and me to track what I am doing when with my remote controlled units. It started out with helicopters. Hence the name.

If only one of my units is of interest, this unit can be clicked on the right and only posts regarding that unit shows up.

This blog is open for comments so feel free to leave a comment.

Walkera 4#3 repaired

walkera 4#3Posted by xilsoe Jul 06, 2008 18:24:49
Yesterday I flew the Walkera 4#3 for the first time after I got the Sea Wolf. I was quite nervous if I could still fly it. I can still fly it smiley When flying yesterday the heli made a sudden drop and the main rotor wouldn't turn. Then I discovered the canopy had been dispaced. I moved the canopy back and then the rotor would turn again. Later when flying this sudden drops happened again.

Today I decided to invesitgate what is wrong. The behaviour indicated a loose connection. This prooved correct: I found one of the solderings going from the ESC to the motor was broken. I re-soldered and then this bird flew perfect again smiley

It seems that one of the batteries has died smiley It only allows a very short flight and the charger only charges about 200mAh into the battery after having discharged the battery. So I only have 3 good batteries remaining. That should be enough for now smiley

Some time ago I discovered that Walkera had released the Walkera 4#3A and the Walkera 4#3B. Both are 2,4Ghz. The A version has a plastic rotor head where the B version has a metal rotor head. Both versions also have a different motor from the original 4#3. I went to rcgroups.com to see what people think of this updated bird and the info was extremely positive. The motor should live much longer, the servos should be better and it should be more durable all in all smiley

Perhaps my original 4#3 should be retired and a 4#3B take it's place smiley

I didn't get this stated before, but I broke the Sea Wolf during this week. I have written to Robbe for a replacement of the broken part but have had no response yet. I think I will look into a temporary solution to get it working, until I can get the correct spare part.

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Brushless upgrade succesful :)

walkera 4#3Posted by xilsoe Apr 12, 2008 15:34:37
Yesterday another ESC arrived so i could have another try on getting the Walkera 4#3 upgraded to brushess. I was concerned if the motor would still work; last time I tried the upgrade I incidently de-isolated one of the motor wiressmiley
I didn't know any way to put the insulation back on the lead so I put some heat shrink on the de-isoated lead.
Luckily the motor was still OK. Otherwise I would have to wait a long time for a new motor.

This time I was very careful when I did the installation. Every time I had made a change I tested if the set-up was still OK. I did that until the installation was complete so I immediately would know what went wrong.

The first problem I encountered was that one of the solderings I had done at my previous upgrade attempt was failing so I had to re do that soldering. This made me rather nervous as the light in the 4in1 disappeared and I believed I had destroyed the 4in1. I was quite releaved when I found that bad soldering smiley

When that soldering was fixed, the set up worked. The only problem was that the motor was turning the wrong direction. This meant I had to switch two of the wires to the motor around.

After that I mounted the ESC and the PWM->PPM converter and shortened the wires so they wouldn't stick out of the canopy and to reduce the weight addition.

When I was all done I found that the bird had become nose heavy so I moved the antenna installation to the tail. That solved the balance problem.

Now the 4#3 is flying excelent with this new motor that hopefully will last a long time as the walkera ones didn't smiley

I like the power of the new motor smiley I do however not like the added weight and I think the flight time is lower than with the stock motor and I will have to get used to the Low Voltage Cut-off. I also noted that I am not charging as much mAhs to my batteries after a flight as I was with stock set-up. I have read that a smaller pinion will give longer flight times so now I will start looking for a smaller pinion.

I had a look at the Walkera homepage today and i discovered they are releasing a 2,4Ghz version of the 4#3. It seems the new 4in1 has more adjustments available. That and better radio reliability would be the only reasons for getting one.

Instead of getting another 4#3 I am looking into a CP heli and recently I have started thinking of getting an RC Submarine. It seems RC Submarines are not very common and somewhat expensive.
I also found out there are two ways to make the subs dive: Dynamic and Static.
The dynamic divers uses the forward speed to submerge whereas the static divers are able to change their mass density by reducing or expanding air. At first I want to get a sub that is easy to build so I can get diving. Currently I am looking into the Robbe Seawulf.

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Brushless upgrade failed :(

walkera 4#3Posted by xilsoe Apr 05, 2008 20:54:55
I spent all thursday last week and lots of last weekend getting the brushless upgrade of the walkera 4#3 working. I couldn't and then I ordered another ESC. I read these ESCs sometimes cause trouble. I also did some soldering on the ESC. Perhaps this damaged the ESC. When I had finished there was no way the ESC could make the motor go.

smiley

Now we will see how it works when I get the new ESC.

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Received motor and ESC today

walkera 4#3Posted by xilsoe Mar 26, 2008 21:14:10
Today I received the Losi 10250Kv motor and the ESC.

I set up a test with my blue arrow receiver at 5V and this set up works fine at 5V. It will be interesting to see if it also works at 3,7V. There has been reports of problems with the ESCs at 3,7V but they seem rare.
I am still missing the PWM to PPM converter so I can't complete the upgrade yet.

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Ordered parts for brushless upgrade

walkera 4#3Posted by xilsoe Mar 25, 2008 20:55:17
I am so tired of the walkera 4#3 main motor wearing out so now I have ordered the needed parts to upgrade this bird with a brushless main motor. I would like to express my thanks to the people contributing to the thread mentioned below, who hopefully have made this easy for me smiley

No parts have arrived yet.

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Replaced walkera 4#3 main motor again

walkera 4#3Posted by xilsoe Mar 15, 2008 14:47:10
I think I will start looking into upgrading this to brushless. I discovered a thread on rcgroups regarding converting this bird to brushless: http://www.rcgroups.com/forums/showthread.php?t=830186

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Replaced walkera 4#3 tail motor

walkera 4#3Posted by xilsoe Mar 02, 2008 19:42:46
The 4#3 had been flying funny for some time with sudden quick left turns and today I couldn't turn right anymore so I decided to replace the tail motor. The replacement was quite easy. Just take the old motor out and insert the new motor. Then some soldering is needed. Once more the little bird flies much better smiley

I also decided to re-arrange the antenna. Now it is placed below the canopy instead of on the right side of the canopy. Hopefully this makes the bird a bit more aerodynamic.

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Replaced walkera motor again

walkera 4#3Posted by xilsoe Feb 24, 2008 17:02:22
I replaced the main motor on my Walkera 4#3 once again. This time I learned something: The motor shall not push hard against the main gear. If it does it causes more friction leading to shorter flight times and more motor heat and wear. Once again my walkera is flying better smiley
I also had some trouble with one of the flybar paddles coming off today. This caused me to replace the flybar rod.

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