Improving the Corona model in Reflex

[gregw]

I've been trying to make the Corona model in Reflex fly closer to my real Corona.. one small change in the "physical params" (F11) seem to make it much closer to reality..

Distance of cg in front of rotor head = 0.015

This seems to decrease the slight tail heavy oscillation that I get when hovering and make it fly more like my real Corona..

:)

[wsn]

GOOD improvment - I just cheked it. I will amend the download files accordingly.

Cheers - wolfgang

[gregw]

Originally posted by wsn
GOOD improvment - I just cheked it. I will amend the download files accordingly.

Cheers - wolfgang

:D

Now to finish my REAL Logo 10 so I can fly it and try to improve the Logo 10 Model as well.. :p

[derway]

One thing I've been wondering is if the reflex model is supposed to be a corona with the z-links in aggressive, or stable position?

Greg, don't you think reducing the "hover instability" is also needed? Or does the cg change take care of that?

I also find that the reflex model often has no tail authority, where the real thing does have. Some added pitch to the tail rotor, and/or some added TR RPM...

When I put the corona model weight, down to what mine is at, (0.91 kg), the model is way more squirrely than my heli. I've been trying to lower the MR pitch to 8 deg, and get the head RPM up, but I have to put in 4 kW of motor to get it up to 2000 rpm.


No matter what I do, at that weight, the reflex model is many times harder to hover than my corona. The "washing around in a big bowl" just doesn't happen in the real thing. My actual corona is closer to rock steady, hands off sitting there for many seconds at a time.

What do I change to make it more like that?

[gregw]

derway,

The change I suggested improves the hovering stability by removing the slight tail heavy oscillations you encounter during hovering..

For tail authority, I agree that the model is weaker than my real Corona.. I haven't tried to improve this yet.. one thing at a time..

I have the MR pitch on the model set at 10. This is pretty near what the real Corona would be, when using a 4 degree + a 6 degree blade holder (ave 5 degree pitch).. I believe that the blades themselves already have a 5 degree pitch built in.

I've never tached my head speed, but I'm pretty sure that it doesn't reach 2000rpm..

Greg

[derway]

I made the cg change right away.

I'm using just 4 deg grips, and have the model set at 8. And weight at .91 kg.

The reflex model is still much harder to hover, than reality.

On RPM, I'm talking max, WOT rpm.

Greg, which z-link position do you have yours in? I'm using less aggressive still, and thinking maybe the model is more on the aggressive side...

Don

[gregw]

My Z-links are in the "stable" position... When compared, I agree that the model is slightly more sensitive than the real Corona.

I'm in the process of repairing my Corona after a fall from 150 feet due to a lost of signal, so hadn't flown my Corona for the last two week or so, so my comments may be slightly off..

I'm also holding off rebuilding my Corona to finish building my Logo 10 first, so the Corona will probably be on the ground for a little longer.. :p