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View Full Version : MX400 Pro bobbing


whstlngdeath
12-18-2006, 11:32 PM
Hello, first-time post here...
I'm having a blast with this heli. After much adjusting, tuning and tweaking, it's hovering fine. I can hover out a pack in the confines of my living room, it's that stable. The only problem I'm having is a consistent loss of altitude whenever I add corrective cyclic or tail inputs. It'll drop about 12 inches, then recover on it's own without my help. Here's my setup: Ultrafly C/13/33H brushless outrunner, (3350Kv), with a 10T pinion; C.C. Phoenix 35, (gov. high); Futaba R146iP PCM Rx; GY240 Gyro with a Futaba S3110 servo on the tail; E-flite S75 servos everywhere else. This is the mechanical mix version and not CCPM. There is slop in the head, especially in pitch. The governor holds a consistent 2400rpm on the ground, and there is no glitching. I've tried different settings in the ESC, with no help. I'm suspecting either the S75 servos are not fast/strong enough for this heli, or I need to upgrade to CCPM. It's a very good hovering machine, and I've no doubt that forward flight will be ok, but all of that bobbing up and down is rather annoying. Any and all input is greatly appreciated. Here is a pic, and I'd like to add that I no longer use the training gear, as takeoffs and landings are easy on the carpet! :wink:

Jesse

VBDave
04-07-2007, 09:25 PM
You always lose altitude with cyclic inputs. It's a fine line of cyclic + feathering throttle to compensate. Some radios allow REVO mixing in Idle Up mode that will add throttle based on cyclic input to help compensate, but that doesn't do you any good indoors.
(Unless you're NUTS and are running that bird in IdleUp in your livingroom....) :P

whstlngdeath
04-07-2007, 11:26 PM
VB,
thanks for the response. The indoor flying was just basic hovering in norm mode. The weather has gotten better and I'm now hovering outside. I've come to realize that the altitude loss is normal and I have to compensate for it. Outside, it seems to be less loss, since I can hover higher, and presumeably out of ground effect. The surprise I got outside is how the wind can affect the hover. With a steady head wind, it actually wants to climb and move forward, as in forward flight. Otherwise, it's a joy to hover, and real easy to control.

Jesse