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K2-tokyo's blog
Posted by K2-tokyo | Sep 24, 2013 @ 02:17 AM | 3,019 Views
Hi, guys

I am planning a conversion of my Agusta 109 400 coaxial helicopter in the former blog:

http://www.rcgroups.com/forums/showthread.php?t=1959447

into a single rotor helicopter with 4 blades. I have already succeeded in a conversion concerning the main rotor system as in the picture.

I used the same plastic main frame with the coaxial mechanism and a 4-blade system due to Copter X:
http://www.ehirobo.com/shop/CopterX-...gbee85c8blmgd3

with some modification. An old brushless motor of Aveox 27/26/2 with KV=2500 is used, and the current draw for the main rotor is 16~18A at 7.4V.

I installed a 21 g tail motor AEO ADH-300S with KV=2400 under APC 6X2 propeller, a sufficient tail power at 7.4V! The problem is that it's tail is very heavy! So a 70~80 g weight is necessary at the top.

For this weight problem, I changed our power system into one on 3 cell 11V; and so, the original Lipo 1600mAh is available.
The main motor : Hyperion HP-HS2221 with KV=1630,
http://aircraft-world.com/shopexd.asp?id=3788
The tail motor: AEO C20 PRO with KV=1550,
http://www.aeorc.net/products/motor/...l#.Ulor2yiaF28

AEO C20 PRO burned probably because of a short circuit at the root of 3 wires (never overload). So I changed it into a brushless motor of KV=1600. And I installed a Flymentor auto-pilot system.
Posted by K2-tokyo | Aug 16, 2013 @ 06:12 PM | 3,260 Views
Here is a Youtube video of my friend Hino's experimental 8 bladed head micro-helicopter, whose rotor diameter is 440 mm. His aim is in making a 1/72 scale helicopter of Mil Mi-26 (for example, ZVEZDA plastic model; http://www.scale-rotors.com/galerie/...lo-zvezda.html). Only a rudder gyro, but a 3 g weight at the tip of each blade. So Hino succeeded in making variable pitch micro helicopters with heads of any number of blades;
http://www.rcgroups.com/forums/showthread.php?t=593808
(1/48 Academy CH-53, 7-blade head, in 2006),
http://www.rcgroups.com/forums/showthread.php?t=477674
(1/35 Heller Super Frelon, 6-blade head, in 2006),
http://www.rcgroups.com/forums/showthread.php?t=596200
(1/35 Trumpeter Mil Mi-8, 5-blade head, in 2006),
http://www.rcgroups.com/forums/showthread.php?t=1970193
(1/48, 5-blade head, 3-blade head, which are in K2-tokyo's blog 2013),
http://www.rcgroups.com/forums/showthread.php?t=519910
(1/35 Academy Black Hawk, 4-blade head, in 2006):
‪Hino's 8-blade experimental micro-helicopter‬ (1 min 21 sec)

...Continue Reading
Posted by K2-tokyo | Aug 05, 2013 @ 06:54 AM | 3,368 Views
Here are two variable-pitch micro-helicopters by my friend Hino. The first one has a 5-blade head with 246 mm rotor diameter; 175 g, 2 cell 300mAh, only rudder gyro, but 1.2 g weight at the tip of each wooden blade.
Hino's 5 blade experimental micro-helicopter (1 min 47 sec)


The second one has a 3-blade head with the same rotor diameter; 1 cell battery, walkera 3 axis gyro+0.6 g weight at the tip of each wooden blade.
...Continue Reading
Posted by K2-tokyo | Jul 19, 2013 @ 09:20 PM | 3,382 Views
This bullet train completely retired in March 2012. This is the best one I like, and I often got on the front car of this train from Tokyo to Kyoto, or Kyoto to Tokyo. Some of this train had 16 cars including 4 double deck cars; in particular, I like a double deck restaurant car.
I was not interested in railway models until the retirement of Shinkansen type 100. See the N-gauge movie:
a kitchen bullet train (1 min 3 sec)

Posted by K2-tokyo | Jul 18, 2013 @ 10:28 PM | 3,694 Views
Hi Guys,

I bought that one from Italy:
http://www.viadelmodellismo.com/AR-1...(2.4Ghz-Mode-2)
Very cool and good for flying in a small room.
As you know, I am a mania of Agusta A 109 helicopters.
It is sorry that Art tech stopped the production of this heli(?).
The transmitter is of mode 2, but you can easily reform it to mode 1, or mode 3 (mine is of mode 3); some soldering and some mechanical adjustment are needed, but no additional parts are needed. (Be careful about the color of cables; white, red, black wires do not mean signal, plus, minus cables, respectively.)

After several flights, I lost the original blades at 3 small accidents. So I replaced the blades by new blades, which have larger widths 33mm; the original one has 27mm width. I was very surprised by so large difference, but the new ones are more scale-like.

I placed two small figurines of Disney Cinderella in the pilot room. So, the AUW increased to about 950 g; the current draw is about 8~9 A on 3 cell 1600mAh.