Hi Lynx man

A nice frame! According to Hino, his past (in 2013~2014) 8-blade heads were made only by strong Epoxy glue (roughened the surfaces ) because they were too small for installing carbon fibers. And after several flights, he experienced an accident of the jumping out of one blade holder. So in this year he made a little larger hub with a 1mm penetrating metal pin for every long nut as the above picture. The following is of 2014-version (only an experimental helicopter. 15mm blade width):

Hino 8blades 3. 2014 (1 min 6 sec)

Awesome! I hope I can get it to fly when I try again. I hope to avoid heavy blades.

Success. I got it to fly. It's very stable, but it oscilates. I will try increasing the headspeed first, and then reduce the gyro gains if that doesn't work. I have to remove the whole mechanics to adjust, unless I drill some holes in the top of the fuselage to access the pots..

Proof. Now for some tuning. I drilled holes in the top for gain adjustment, and that did the trick.

Zvezda 1:72 Mi-26 RC conversion. (0 min 27 sec)

Well, that's about as cool as they come, great job! The paint looks really good, too.

Joe

Here's how I dealt with the weak landing gear. I attached the wheels to a 2mm carbon rod and glued it to the panel on the underside of the body. The panel comes off for access to mbattery and mechanics. Crude, but strong. I did this now, after the video was shot.

Hi Lynxman

A great success! Congratulation!

25°C in my living room now, and the new 2400 kv tail motor didn't overheat on the Lynx.

I assembled the second little Lynx again with a new 1806mm 2300 kv wuadcopter motor for the main and a 2400kv tail motor instead of the old 3000kv motor. Great stuff. I was also able to get the K-bar to work by enabling "micro heli mode". :P Flies pretty good now. I hovered out of ground effect for three whole minutes before I touched the motors, and they were warm, but not too hot like the old tail motor, which actually would melt the tail. It's finally reliable enough to take flying.

I tried the printed gears but I had changed the pinion a little before I printed it and it made it too thick, so it woulg melt the pinion after a few seconds. The gears work fine on my 100% 3D printed fp heli that I'm developing, so it should work if I had bothered to print a proper pinion. Instead I just changed back to 0,4mod gears.

And now I did the same with the first Lynx. Same result there, but the tail still holds better on this one, withthe ZYX-S2. It's really locked compared to the other one.

275 mAh for 3 minutes on the newest Lynx, number 232. 3050 rpm and 2300kv motor at 80%. Efficient setup.
334 mAh for 3 minutes on the older Lynx, number 235. 3200 rpm and 4100 kv motor at 40%. Not efficient. Experimental initial setup. Would benefit from a lower kv motor.

Hi Lynxman,

According to your comment in ScaleRChelis.com, you found a video of a large RC Mi-26:

Mil Mi-26 von Volker König (5 min 16 sec)

I have never known such a model helicopter! So Volker Koenig succeeded in flying this model in 2010.

Hi Lynxman,

If you still want to install a Walkera Master CP receiver gyro into your micro Mi-26, I can recommend an Emax BLHeli 12A esc for the tail brushless control;

https://www.banggood.com/EMAX-BLHeli...-p-963634.html

This controller corresponds not only to the classic servo signal, but also to the tail brush motor signals of a Master CP, a V400, and a G400. I have successfully tested it. (a Canadian modeler Alwayscrash found it!)

Do you simply put it in the rear servo output of Master CP? And which makes the analogue signal usable for a brushless tail motor?

Originally Posted by Lupusprimus

Do you simply put it in the rear servo output of Master CP? And which makes the analogue signal usable for a brushless tail motor?

Hi Lupusprimus,

Just connect the esc plug with the rudder output of a Master CP. Then, the initialization procedure (every time one needs) is as follows:

1, Transmitter on with the lowest throttle position.
2, Connect the battery with the receiver and esc.
3, raise the throttle stick a little.
4, lower the throttle stick to the lowest position. (So the esc cannot understand the full throttle information!)

Then, this esc works as if the signal were a classical servo signal. Since the rudder has a mixing with the throttle channel, the initialization can be done only by the throttle stick.
I do not understand why, but this esc also works for a classical servo signal. Since the rudder output PWM's of a Master CP, V400, G400 are the same; the period 0.5 ms and the pulse-width varies over 0~0.5 ms, this esc is available for the brushless conversions of the tail motors.

As for the brushless conversions of main motors, this esc is not available except for G400. This is because the throttle pulse of a Master CP (or V400) is a PWM of the period 2 ms.

There is a possibility for the change of this period by the BLHeli software. But I am not sure.

Hi guys,

I found a manual of BLHeli software explaining the brush-brushless conversion :

https://hobbyking.com/media/file/b/l...bs_rev14.x.pdf

According to this manual, we know:

''All codes support 1kHz, 2kHz, 4kHz, 8kHz and 12kHz PWM input signal in environments where the ESC takes its input from a source that would normally drive a brushed motor. The code also supports regular 1-2ms pulse width PPM input or OneShot125 (125-250us), at a rate up to almost 4kHz."

So, the tail-motor drive PWM's of most Walkera gyro receivers ( 2000 Hz ) are in their territory, but the throttle PWM's of Master CP and V-400 receiver (500 Hz) are out of their territory.

Hi all,

A 6-axis gyro receiver XK K110 is a very hopeful flight controller for micro scale helicopters. I wrote a know-how of its tail brushless conversion by using suitable BLHeli escs :

https://www.rcgroups.com/forums/show...-gyro-receiver