700x build

[24sevenslacker]

700x build

So.... Just been out to test fly it. Bit nervous to start off with as i always imagine it to lift off, flip over and destroy its self. Well it didnt. Nice smooth spool up, popped it up into the air and a huge sigh of relieif.

Good points:

Nice smooth hover, solid as a rock

Gear mesh fine

Blade tracking perfect

Happy happy happy

Bad points:

Tail wag. I started off with low gain and the tail seemed to be sluggish and loose, so i adjusted the gain slowly until it started to wag. No matter where i adjust the tail gain i just cant seem to get rid of the wag .

Motor very warm. I brought it down after a 2-3 min test flight at 60-70% throttle and the motor was quite hot. I could hold my fingers on top of the motor but only just. The esc and wiring was all cool. Could this be my esc settings?

I read somewhere that you need to change the tail servo arm to a longer one as with the standard arm you cannot get rid of the tail wag. Could this be my tail problem? Thanks

[tomatwalden]

Hey - congratulations!

Big isn't it?

Yeah, the tail config on the 700x is designed for relatively low tail RPM with large tail blades (115m) and therefore a fairly large amount of mechanical gain. Personally, I found that the whole thing just worked better for me if I reduced that mechanical gain by running a much shorter tail horn than the one that comes in the super-combo.

With a shorter horn, you can run higher gains in the FBL unit. That said, I know others are running a stock setup and got it working fine ...

[24sevenslacker]

I am doing some research into what servo horns will fit my servos. Going to try what you said, which is also what nige explained to me. Run a shorter servo horn. Does that help the setup a lot?

[tomatwalden]

Yep. Makes a huge difference. When I get back to my place (out flying at mo) I'll post the tail setup including horn that I've used.

[24sevenslacker]

700x build

Are you using the spektrum servos?

And thanks btw

[tomatwalden]

Are you using the spektrum servos?

And thanks btw

Yep. I'm using the horn from a 550x. This has holes so you can select different lengths.

[24sevenslacker]

700x build

I will have a look see if i can find something similar

[tomatwalden]

This is the horn I've used ...

Blade 550 X Servo Arm Set : BLH5564

[24sevenslacker]

Thanks for that. First class delivery

[24sevenslacker]

Managed to tune the tail a lot better today, i went back into the beastx and changed the tail limits. Shortened the travel by about 1mm either side and now its a lot lot better. In fact after a couple of tuning flights i would say it needs a little more gain. The wind seemed to blow the tail a little. Causing a slight wag but when i gave it hard rudder it didnt bounce back (wag)

[tomatwalden]

Good idea. In essence you've done the same thing and reduced the mechanical gain, increasing resolution to the BX.

[24sevenslacker]

Visited nige yesterday at thearne club. He set my gov up and supplied me with a shorter tail servo arm. Had a few test flights and got the tail somewhere near. Also loaded the horizon settings into the esc. Havnt had chance to have a proper fly as of yet as its raining. Cant wait to get it out. Thanks again nige

[24sevenslacker]

700x build

First proper 3d (my level of 3d) flight on it today. I love it its a brilliant heli

The camera man was not so good as hes never seen a heli fly before so i think he was trying to watch at the same time lol

http://youtu.be/bYZIaNJTxSs

[tomatwalden]

Good to see you're enjoying it. Love mine too! Was a bit gutted when I crashed it, but happy now it's rebuilt!

[24sevenslacker]

Shouldnt crash it, not really trying anything out of my league. Im happy with it because it flies like i expected it to. And it hasnt been that hard to set up (even though i had help)

Im thinking if selling my trex 600n as i dont think ill use it any more