How I did it.

[X34]

Some forum members asked me how I built my Trex to be quiet and stable.

Here it is,
To make it quiet, gear meshing and belt tension are important here.
Too tight amp draw too high, too loose - noisy. I use a small strip of news print to be my feeler gauge. Feed the strip between the gears u want to mesh, a good meshing is when the strip goes thru easily and the gear marks on the strip is very even. No mark or very faint - too much gap. The strip tears/cut - too tight. The gear mark not showing full height of the gear teeth- axis of shaft are not parallel.

Tail drive belt tension - some say as loose as possible as long as it doesn't slip. But I prefer to set the belt tension by pushing with an allen key on the belt near the tail drive pinion. It should go pass the center line with a light force. Too loose can cause the belt to slip and high wear.

Secondly, to make the bird stable, the control slides/moving parts must move smoothly. Slide/rock etc the moving parts must not bind at all. Binding will cause uneven control movement. One example of Trex is the washout hub, it binds all the time. The new ones comes with a brass insert. Very smooth.

Finally, balance the rotor blades with the head and balance the entire tail rotor. How to balance the entire head- remove all lower swash links, remove main gear and tilt the bird sideways, making sure the blades are straight and spin. If it is balance it should stop in any position. Add tape to the lighter blade if it is not balance. Do the same for the tail rotor.

Hopefully u guys are not bored!

[HZM]

Cool.... thanks for sharing I think u must gotten too much "nusiance" PM /call/sms and finally "cave in" to reveal this secret


Thanks

Mike

[Adrianli]

Whatever u had said was great. But me simply bo chap, as long as the thing can go up in the air can liao. Ask HZM n he'll know!!!


Too many hobbies, so little time to make the perfect flying machine.


As long as can hover can liao!

[X34]

Adrain,

I agree with you, u get what u put into it. U are the exception, look sooo many people do eccpm conversion to achieve a steady Trex.

I m trying to resolve the unwanted mixing with the standard setup. B4 I go into eccpm(which by the way is my preferred method)

Must let u hover my Trex and make u change your mind.

One more thing to add to my setup- CG, it should be slightly nose heavy. Easier to fly.

[Super-Hornet]

Hey X34

I convert my T-RexX to eCCPM is not because I wanted to remove any unwanted binding or to make stability.

My T-RexX in mCCPM is very stable. I like it. The reason I wanted to go eCCPM is because I wanted to reduce the weight in order to fly longer but it turns out to be not much can I reduce the weight. Another reason I go eCCPM is because I wanted to reduce the number of mechanical parts (an hence much simplier design) and also I wanted to increase the max pitch. The stock pitch settng is limited by the size or the gap in the pitch throw. in eCCPM, my pitch is limited by the lenght of the main shaft.

Also, I got eCCPM is because for me, in eCCPM, the response is fast (lesser delay due to lesser mechanical parts)

Super-Hornet

[X34]

SH,

Wa liao, u think I say u. No lah, don't get me wrong.

When I say "steady Trex" I mean to be different, variation, customisation. Which makes sunday morning at Bishan interesting for me to look at modifications done to Trexes.

Cheers

[Super-Hornet]

Hey X34... So sorry. What i mean is that I believe some of us converting to eCCPM is because we like it to be in eCCPM. Just in case some of them saw us converting to eCCPM thinking why they still in mCCPM. Stock mCCPM can fly very well also. It is just matter of personal preference.

Super-Hornet