Two Bladed Flybarless TRex 450X Version 4.0

[Super-Hornet]

Hi all
[June 15, 2005]

After when through a few designs, the latest 2-Bladed Flybarless TRex (version 4.0) looks promising!

Just finish hovering (Using ABS blades so not to break precious wooden blades) in my living room. I must say, Heck! It hover like as if I'm using Flybar-Paddles design! Very stable. Cyclics is as good as Flybar-Paddles.

So what the heck different this time? Here:

Version 4.0
----------
- Using 2 Gyros as Flight Control System (FCS) like in version 2 and 3. BTW, version 3 is using FCS with direct swash plate to blade grip control.
- Using another method of Mixing to reduce or creating finer cyclic control... Just like version 2 but slight modification.
- Using "Leading Pitch Horn" Control. (Normal TRex Main blades grip is "Trailing Pitch Horn". Tail blade grips is"Leading Pitch Horn")

Since using mixing, I can/need to tune up the FCS gain.

Later following post will be the close-up pictures of the flybarless head.

Super-Hornet

[Super-Hornet]

Mixer Design

Picture #1 (Mixer)

{Sorry for poor picture quality... My handphone camera is not as good as PhiBeR's type}

[Super-Hornet]

AntiRotation Block

Picture #2, AntiRotation Block

[Super-Hornet]

Leading Pitch Horn

Picture #3, Leading Pitch Horn

[Super-Hornet]

Leading Pitch Horn

Last pictures, Picture #4, Leading Pitch Horn... Alternate view.

It is 8:19pm after this post.. Very hungry. Going to eat dinner now.

Super-Hornet

[Super-Hornet]

Update:

Just test hover with Align new wooden 335mm Blades and the stability still there. Yippie! I just hope it perform well in outdoor and in FF and who knows... in 3D as well.

Super-Hornet

[HZM]

U are the man

Cool

Mike

[Super-Hornet]

Thanks Mike and Thanks to the person who up my Reputation point.

I try to update any new changes or new finding over here as soon as possible.

Super-Hornet

[Adrianli]

When flying outdoors?

[Super-Hornet]

When fly outdoor? Hmmm working during weekday leh... Maybe Saturday morning. I will bring along my Flybar-Paddles head also, in case flybarless does not work and I can swap back to Flybar-Paddles in order not to waste weekend flying.

Super-Hornet

[MicroHeli-Nut]

Let's get it Started......

Good job!

[Sebastian]

WAh seh! Nice work SH!

[Super-Hornet]

Hi all

Yesterday (June 18, 2005), I tested flying my DIY Flybarless TRex at Yishun Ave 7.

Configuration Changes (v4.1)
- Change all to Hitec HS-56 servos. (Recycled from my eCCPM TRex).
- Change mixer to a better one (DIY myself). During testing, the Mixer ratio is 2:4 or 1:2 (Means Swash plate movement is divided to 2 before reaching to blade grips)

Flight characteristic:
- Really can hover well.. Similar to flybar-paddles.
- Need a lot of tweaking at the moment because if gain too high on Aileron, Heli sometime will go rocking (Aileron Rocking) just like tail wagging but in twisting motion, if bank too much.
- Forward Flights looks good but sometime experiencing wobble. That one I suspect head damper too stiff.
- Heli sometime keep on banking to left or sometime to the right..as if alignment is out. This one I suspect is my Hitec HS-56 is damage or dying off. I feel that the flight characteristic is not as good as when I use Hitec HS-55 during initial (at home) flight test.

Flight Debrief:
- Not sure whether is it my imagination or what but feel that for mechanical mixing (mCCPM), using HS-55 perform better than HS-56. That could be due to:
1. maybe my HS-56 is dying off. (I feel that HS-56 dies off much faster than HS-55. It dies in terms of its potentiol port die faster).
2. Maybe because HS-55 has higher torque? and slower?
- FCS gains still need to do finer tweaking.
- Also change to softer damper head. It is the Align's 4-O Ring type.
- Flying Flybarless with FCS is ok to me.. just that I have to learn new way of flying it.

After reaching home, I replace it to HS-55 for all cyclics but pitch and tail still remain as HS-56.
Also change the mixing ratio to 1:4 instead. My DIY mixer has up to 4 holes on each side for various mixing ratio.
Due to my mCCPM mechanical especially the "A" Frame sux, decided to use Advance programming mix (Futaba 9CHP) to auto calibrate the inaccurate Elevator movement. While doing it at bench test, the stupid masking tape (that tied heli firmly onto the bench) gave way and my whole heli crashes down, hitting my Computer PSU and whole blades (Both new wooden blades) decintegrate into pieces. Some of the blades shrapnel hit my finger (minor cut) and also hit my TX trim button and damage it.

I did manage to repair the Trim button but not as good as brand new. It also bended the main shaft but don't care at the moment. Test hover in living room and so far so good.

Wanted to test flight today (June 19, 2005) but not many ppl (Only Mike and Genexis) go fly this morning so, decided to test flight it on other day instead.


Super-Hornet

[koon]

SH, you really pay alot for this Flybarless experiment. money, time, sweat and blood.. hope it will work in near future!

[Super-Hornet]

The things I spend money on this project will be:
1. Two brand new GWS PG-03 gyros.

HS-55 was previously use in my Hornet II. HS-56 was previously used in my eCCPM TRex. Blades was previously injured during a crash. The injured is just the covering got cut open. All mechanical in the Flybarless are actually from the usual TRex head. The new mixer is actually from 2 pieces of HS-56 servo horns. The new Rotor Hub (4 O-Rings) was previously purchase to replace my damage Rotor Hub.

Super-Hornet