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Posted by K2-tokyo | Sep 20, 2021 @ 10:37 PM | 15,089 Views
My friend Hino made 3 scale micro helicopters by using plastic models this year 2021:

Academy 1/35 Blackhawk, Revell 1/32 JetRanger, Italeri 1/48 Sikorsky H-34:

Hino's blackhawk2021 (11 min 42 sec)

Hino Jetranger2021 (4 min 47 sec)
...Continue Reading
Posted by K2-tokyo | Sep 17, 2021 @ 10:18 PM | 9,185 Views
This is my short memo concerning the Radio Master 16S for an Eachine E129 and a Blade Nano S2 (never for 3D).

I. The method of the firmware upgrade for Eachine E129 helicopter, and OMP M2(original receiver)

1, At first, you had better upgrade the transmitter firmware to the newest one by using any PC software OpenTX Companion:

2, The internal multi-module upgrade for AETR-type protocol (E119, E129, OMP-M2);

Use the Multi-Module firmware in

Select a module: RadioMaster TX16S Internal Module (4-in-one)
Firmware version:
Then download: multi-stm-serial-aetr-v1.3.2.77.bin

Transfer this file into the "FIRMWARE" folder in the SDcard in the transmitter by using the USB-cable. Then, after cut the USBcable, do the firmware flashing operation by the transmitter!

3, You can find E129, OMP in the internal multimodules.

II. Blade Nano S2 helicopter

1, (channel order). My main receivers are of Futaba, and so my default channel order is AETR in RADIO SETUP.
I know the channel order of blade helicopters is TAER, but in the setting of RadioMaster 16S the channel order of NanoS2 should be AETR. (I do not know why).

2, Create a new model; choose
(i) plane (ii) motor: yes CH3, (iii) Aileron: one, CH1, (iv) flaps: no, (v) Ele, Rudder: CH2 A, CH4 B, (vi) Yes.

3, (Mode Set up)
Internal...Continue Reading
Posted by K2-tokyo | Nov 11, 2017 @ 04:05 AM | 21,586 Views
I have been searching good 6-axis gyro flight controllers for multi-bladed micro scale helicopters of 150~250 classes. I tested some Walkera receivers for G400, V450, Master_CP, V120, and some other controllers, XK_K110, CC3D, Microbeast_plus, Trex_150GRS, Spirit, Naza-H_GPS.

I can conclude that G400 and XK_K110 are the best among all apart from Spirit and Naza-H; Naza-H is too large for my purpose and Spirit cannot handle a tail motor system because it has too sensitive tail gyro.

My criterion is not versatility, but that one can do an easy turning flight in a small room under such controllers. Such a criterion is due to recent difficulty of finding flight area caused by accidents of multicopter drones. XK_K110 and G400 receiver-gyros satisfy this criterion very well.

As for a successful application of a K110 board with a second S-FHSS receiver and a heading-lock gyro to a 1/43 Blackhawk (a reform of Nine Eagles's one), see:


As for a 4-blade 400-class Agusta with a G400 board, see:


The method above of applications of K110 boards requires a second receiver and another heading-lock tail gyro (a second receiver is good not only for getting a signal from the rudder channel, but also for getting signals from channels 7,8 for the 8-channel S-FHSS transmitter). However, recently an Australian RC Groups member "ptern" invented a new tail-brushless...Continue Reading
Posted by K2-tokyo | Jun 17, 2017 @ 01:43 AM | 11,053 Views
Hi guys,

I was testing flights of the SRB-4B micro helicopter by cheap gyros! This is because the original HIROBO 3-axis gyro system is too expensive, and only for 40, or 72 MHz transmitters.

The first experiment is by 3-axis gyros; a Tarot ZYX, a Walkera V-400 gyro-receiver:

SRB 4B (4 min 48 sec)

The second experiment is by 6-axis gyros; a Spirit flybarless gyro system and a Walkera Master CP gyro-receiver. The Walkera Master CP has shown a better performance than the Spirit (the rudder gyro of the Spirit is too sensitive for the tail motor systems!). So I introduce only the video of the Walkera MCP:

SRB4B 6axis gyro (2 min 17 sec)
...Continue Reading
Posted by K2-tokyo | Dec 21, 2014 @ 08:12 AM | 18,646 Views
I am testing my 1/22 comanche helicopter (see https://www.rcgroups.com/forums/show....php?t=2287333) equipped with an Openpilot CC3D flight controller. Such a controller came from Hobby King:

The result in the attitude mode (6-axis mode) is satisfactory, but not so excellent until now. I want to test the Apm 2.6 mini flight controller as in the pictures, too.
Posted by K2-tokyo | Nov 17, 2014 @ 08:41 PM | 16,124 Views
Hi guys,

I am making the version 2.0 of the 1/22 Comanche paper craft model, which is the successor of the former version:


The large improvement is the small slit in the front leg, which improves the side-view looking. Further I am testing some new motors for ducted fan because the old motor due to Aircraft is no more available..
Posted by K2-tokyo | Sep 24, 2013 @ 02:17 AM | 17,567 Views
Hi, guys

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


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:

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,
The tail motor: AEO C20 PRO with KV=1550,

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 | 17,872 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;
(1/48 Academy CH-53, 7-blade head, in 2006),
(1/35 Heller Super Frelon, 6-blade head, in 2006),
(1/35 Trumpeter Mil Mi-8, 5-blade head, in 2006),
(1/48, 5-blade head, 3-blade head, which are in K2-tokyo's blog 2013),
(1/35 Academy Black Hawk, 4-blade head, in 2006):
‪Hino's 8-blade experimental micro-helicopter‬ (1 min 21 sec)

Hino 8blades 3. 2014 (1 min 6 sec)
...Continue Reading
Posted by K2-tokyo | Aug 05, 2013 @ 06:54 AM | 18,107 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.
Hino's 3 blade micro-helicopter (1 min 20 sec)
...Continue Reading
Posted by K2-tokyo | Jul 19, 2013 @ 09:20 PM | 17,190 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 | 18,068 Views
Hi Guys,

I bought that one from Italy:
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.