ghtracey
10-29-2007, 01:09 PM
Sorry, another long post, but since this is the only access I have to experience... :)
So, as I posted earlier, maidened the Titan this weekend. Everything went great, came of the ground nicely, actually did a 10 sec stint with no right hand before I chickened out as it was drifting forward slowly. But, I have a few small issues that I wanted to ask you those of you with more experience than me.
1) When I spool down after landing, there is one RPM range where the chopper starts to dance for a couple of seconds... shaking about, the first time it did it I thought it was going to flip over. Is this normal, and if not, any ideas how to get rid of it? It happens when I throttle right to idle (even slowly moving the stick) or hold the stick at about 0 pitch and hit throttle hold, or hold 0 pitch and cut the engine. Something may be out of balance but I don't know what, will do the blades today and check them.
2) I'm still breaking in the motor (3 tanks now) so I'm keeping it pretty rich. I think I am anyhow, after a hover through an entire tank, I can hold my hand on the head for more than 5 seconds, its hot but not burning. I have two issues with tuning though:
- if I land and idle down, the engine will idle fine for 15-20 secs then "burp" and die (quick 1/2 sec rev). I think its too rich on the low end (pinch test takes quite a while to idle it up). That sound like what would happen?
- when I am in a hover there will be an occasional quick RPM increase (again a little 1/2 second jump) that pops the tail right a tad. There's no other effect to this, the heli flys fine and has never stuttered or seemed like it was about to die, I can pull pitch from a hover and put it into a full out climb with no hesitation at all. I'm thinking that this may be a comnbination of two rich on the lowspeed, and perhaps too little headspeed (my pitch meter is in the mail, but visually I am guessing that I am hovering with more than 5 degrees pitch at center stick). I don't know what 1600 or so should sound like (woodies still) but I am going to drop the pitch and up the throttle a tad and see if it smooths out some.
3) Finally, and this one worries me most... when I cut the throttle duing the spool down, I can hear a ticking sort of noise. It almost sounds like the belt slapping inside the tailboom, but the belt tension looks fine (about 1/4" of slack). I don't have the 0499 TR shaft yet, it too is in the mail. Is this a normal thing?
Again, sorry for the long post, trying to be descriptive. Hopefully someone can give me a little bit of help.
So, as I posted earlier, maidened the Titan this weekend. Everything went great, came of the ground nicely, actually did a 10 sec stint with no right hand before I chickened out as it was drifting forward slowly. But, I have a few small issues that I wanted to ask you those of you with more experience than me.
1) When I spool down after landing, there is one RPM range where the chopper starts to dance for a couple of seconds... shaking about, the first time it did it I thought it was going to flip over. Is this normal, and if not, any ideas how to get rid of it? It happens when I throttle right to idle (even slowly moving the stick) or hold the stick at about 0 pitch and hit throttle hold, or hold 0 pitch and cut the engine. Something may be out of balance but I don't know what, will do the blades today and check them.
2) I'm still breaking in the motor (3 tanks now) so I'm keeping it pretty rich. I think I am anyhow, after a hover through an entire tank, I can hold my hand on the head for more than 5 seconds, its hot but not burning. I have two issues with tuning though:
- if I land and idle down, the engine will idle fine for 15-20 secs then "burp" and die (quick 1/2 sec rev). I think its too rich on the low end (pinch test takes quite a while to idle it up). That sound like what would happen?
- when I am in a hover there will be an occasional quick RPM increase (again a little 1/2 second jump) that pops the tail right a tad. There's no other effect to this, the heli flys fine and has never stuttered or seemed like it was about to die, I can pull pitch from a hover and put it into a full out climb with no hesitation at all. I'm thinking that this may be a comnbination of two rich on the lowspeed, and perhaps too little headspeed (my pitch meter is in the mail, but visually I am guessing that I am hovering with more than 5 degrees pitch at center stick). I don't know what 1600 or so should sound like (woodies still) but I am going to drop the pitch and up the throttle a tad and see if it smooths out some.
3) Finally, and this one worries me most... when I cut the throttle duing the spool down, I can hear a ticking sort of noise. It almost sounds like the belt slapping inside the tailboom, but the belt tension looks fine (about 1/4" of slack). I don't have the 0499 TR shaft yet, it too is in the mail. Is this a normal thing?
Again, sorry for the long post, trying to be descriptive. Hopefully someone can give me a little bit of help.