T-Rex 600 & 450 released - Phoenix

[Ashley Davis]

I see I got a plug with them as well

[Thomas]

Did a good job Ash, nealey as goos as the photographer

Shame both of those models went in yeaterday

[Ashley Davis]

I heard and read about it.....d'oh.

[jiberjaber]

Great news Ashley, been flying the spark etc, nice to have an actual Trex in there now

[Ashley Davis]

first comment back on 600 is it's too boggy on chaos, which it probably is but I was trying to replicate the power for most flight conditions. You can make it less boggy on chaos by reducing the cyclic power loading to 15% and upping the power to 1.4kw.

It was a hard flight model to make as the 600 is kind of compromised on power and if I made it good on one thing it was unrealistic on another. This is of course assuming you run it on a 10T pinion which the model is based upon. On 11T it's a different machine again.

[trvo]

I found that simply upping the power to 1.3 is about right, this is according to my memory from flying urs a long time ago...Cyclic loading is about right for the BBT's that u were running...

I'll confirm soon hopefully

Trev

[Ashley Davis]

ok Trev, I thought the cyclic loading was about right but my chaos tends to be a bit heavy handed so I load it up a bit more than I should.
if it's just upping to 1.3 that's fine, I'm happy with that.

[trvo]

Cool

Trying to get back on MSN but its just not reliable...

Trev

[jiberjaber]

Had a play with the 450, it's got white gears on, stock it comes with blue

Seems very unstable compared to mine, its a bitch to hover! Any ideas how I can make it more like mine is in real life?

[robgt]

I can chaos it all day without bogging it down at all (headspeed stays constant around 1800 - no less than 1797) - but tic-tocs bog it, even light ones.
Four point tic-tocs see the head-speed drop off to about 1500-1550.

Still playing...
I like it so far, and will try the power tweak in a while to see the difference
Cheers,
Rob

[Ashley Davis]

jiberjaber .... there's a field called hover stability, just up it closer to 100%.

[robgt]

Further testing...
I increased the motor KV to 1.3 (as suggested) and it does hold better in heavier pitch manoeuvres.
4 point tic-tocs (with blade flutter noise at each end) bogs the head down to the 1450 range.
That said, it still feels quite lively even at that speed.

I have had the tail blowout in fast inverted backwards flight, maybe a tail tweak is in order?
Cheers,
Rob

[Symon]

Ash...how come I have to announce it on trextuning? hahahaha

Nice work boss. They're both great.

I only need to make it climb faster as it's too slow compared to mine...but I'll be able to switch from the Synergy as I find that to be very like the 600.

Would the KW tweak do that? Or should I put more pitch in?

Great work Ash

I know what I'll be doing all evening now.

Sy

[Ashley Davis]

there is something I've been asking Ade to sort out with the guys at Phoenix, which I call "collective acceleration". Phoenix doesn't currently simulate this, when you first load on the pitch you get big acceleration, then headspeed drops and the model settles into a linear climb rate. You can put in more pitch to try to emulate it but you'll also have to whack up the power to deal with that extra pitch. You'll also make the rest of the flight model unrealistic as it will now be overpowered.

I didn't announce on TT as I thought it would be better if someone else did it.

For the tail blow out you can reduce the tail fin size slightly, my tail isn't all that powerful on the 600 so I set it accrodingly in the flight model. I haven't tried flying a backwards hurricane on the real 600 to see how it holds.

[Ade_Law]

the tail power on the 600 isnt fantastic. so if you load the head up and really get it honking it will blow out. i would say the 600s tail is pretty realistic.

Ade