Two Bladed Flybarless TRex 450X (Experimental Part 2)

[Super-Hornet]

[June 14, 2005]
Hi all

Here is my another try of Two Bladed Flybarless TRex 450X (Experimental Part 2).... This time with Flight Control System! (Actually only gyros lah! Hehee!)

Just finish doing hovering at my living room (in the middle of the nite... 1am).

Can't wait for weekends to try it outdoor and also try Forward Flight!

Super-Hornet

[ChRiS]

erm juz wan to noe ah.... i tot i heard some where that the gyro cannot be facing the sky??

[Super-Hornet]

U are looking at total of 3 gyros.

Futaba GY240 for the tail... GWS PG-03 for the Aileron (Sideway or on the right hand side) and GWS PG-03 (Facing the sky) for the Elevator movement.

That means I have X, Y and Z axis.

Super-Hornet

[Adrianli]

Nice work!!!

Now to add a scale fuselage!!!

[pilot_bear]

U are looking at total of 3 gyros.

Futaba GY240 for the tail... GWS PG-03 for the Aileron (Sideway or on the right hand side) and GWS PG-03 (Facing the sky) for the Elevator movement.

That means I have X, Y and Z axis.

Super-Hornet

Did it hover well during the hands-free ?
is GWS PG-03 is a HH gyro, me don't know so asking ?

nice

[rifqi]

awesome stuffs! would like to see it flying!

pilot_bear: the PG-03 is not a head holding gyro..

rifqi.

[Super-Hornet]

Hi all... I was away from computer so unable to response to all the query fast.

Yup... GWS PG-03 is non heading hold Gyro. U cannot use Heading Hold Gyro for this design.

The purpose of the 2 GWS gyros is to mimic the operation of Flybar-Paddles.

I only do one battery (Weak battery) testing during last nite and stop after that because I have to go to sleep liau (finish around 1am something)

As for stability... it is definitely better than without Flight Control System but still need to do more tweaking (Heck!! I got 2 gyros gain to adjust) and also need to modify my linkages.

It is still loose out to with Flybar-Paddles at the moment for current design because the gyro unable to move/change the blade pitch big enough (compare to with flybar-paddle). Currently the linkage is from Swash plate to mixer and to Blade Grips. Later tonite, if I can, I need to go down to get myself some spare for the linkages because I need to modify it to have direct from swash to blade grip instead.

When get more detail, will try to update on this forum.

Super-Hornet

[Super-Hornet]

Hi all
[June 14, 2005]

I modify the rotor head in such a way the blade grips is direct linkage to swash plate instead. With that:

Flight Control System perform better BUT due to direct control, and thus gyros can compensate the cyclics with more throw BUT the sensitivity of cyclics are really damn fast.

In theory, the damping strenght should be proportion to gyro gain BUT the problem of this gyro (or any normal gyro) is that when u set the gain to high, it will cause oscillation (Just like tail wagging) in Aileron or Elevator movement. That is because on a typical gyro, when overshot, it will try to counteract again. If gain too high, it will overshot from trying to counteract.. thus creating a oscillation. Setting low gain will avoid this but the damping effect will not be as high as using Flybar-Paddles.

Stability is still loose out to using Flybar-Paddles.

Flybarless Conclusion so far: Good thing for anyone who are daring to try and NOT RECOMMENDED for anyone who just want to leisurely fly heli.

Then I put back my Flybar-Paddle Rotor head with the Flight Control System still intact. Guess What?!! I don't know is it my imagination or what.... The Whole TRex become EVEN MORE STABLE that what I previously have!

So far I only do hover in my living room. Heck I even Hands Free for a short period of time in a very confine area (surrounded by Sofa, Walls, Boxes and my Raptor)

Conclusion: Damn I going to put in the Flight Control System IN my Flybar-Paddles TRex for the time being. Can't wait for weekend to test it outdoor!

Note: Tonite testing is on ABS Blades only in order to prevent accidental crash that will break wooden blades if using it.

Super-Hornet