TotalG - Occasional Porpoising Under Load

[Si Goodchild]

Guys,

My new TT E720 is being controlled by a CY TotalG that has previously flown flawlessly on other helis. With lightweight packs (12s 4000) the heli flies perfectly, but with the heavier 12s 5000 packs there is a definite tendency for the heli to "porpoise" at the bottom of loops. It would appear that the extra weight changes the characteristics of the heli and causes it to oscilate relatively slowly in the elevator channel when I'm pulling a lot of G. It's quite off-putting. I'm pretty certain that the CG is about right so I'm wondering if this is a Flight Control Gain issue (I currently have a value of 55 dialled in).

Do you think I should adjust the gain, and if so in which direction: up or down? If not, what else should I adjust, given than the heli flies lovely in all other respects?

cheers,

Si G

[Si Goodchild]

A cheeky bump - any advice appreciated.

Si G

[trillian]

Hi Si, I didn't see this till today. You could try bumping the gain down just a bit. 55 doesn't sound high generally speaking but it may be creating some elevator sensitivity. There a couple other functions that might affect it, there is a forward and back stop value (I think the default is 33 and you could try upping those one or two ticks) and also a 'heading gain' if memory serves, which is a hidden parameter and is at a default of 20.

Also, I have a new beta version formware, fc11_4a. I have not tried it yet myself but I will when I get back from Gran Canaria. PM me if you want it and I can email it to you. (It was given to me by Brian, CY field rep and Curtis said it's mostly the same as the previous version but a few things are tightened up and refined a bit).

I really like the Total-G though, The one on my Beam is perfect and has been from day one. The Rave flies very nicely except for a minor elevator bounce that I could almost just ignore but if I can I want to correct it. I'm also putting another Total-G on a new heli in the next few weeks.

[Si Goodchild]

Awesome! Many thanks.