jimmyhua
Veteran
Location: Guam
| Hi All,
I finally have My OS50SX+Muscle Pipe broken in and tuned in.
The biggest surprise I have got to tell you is the needle settings.
My setup is: OS50+Muscle Pipe + Header Tank + PowerMaster 10% fuel.
Final needle settings are: idle screw 20 degrees leaner from stock. Hi speed needle is 3/4 turns (two click less than 3/4 turn)!!!
And, I've got the standard 1/8" gap between pipe and header.
The reason for this post is, I originally posted that my OS50SX+Muscle Pipe + standard gap was locking my headspeed at around 1500 or so rpms.
THIS IS WRONG.
The problem was, I was WAY TOO RICH, at 1 3/4 turns out at the high speed.
Here is the problem I encountered with the OS50+ CY Muscle pipe that led me astray on the needle settings.
I started break in at 2.5 turns out. With this setting, the OS50 has a rich spot at around 40% throttle. But once you get past this, you get plenty of power.
As I leaned out the main needle from 2.5 to 2.0 turns, I slowly gained more power.
Then, from 2.0 turns to 1.75 turns, there was a rather large gain in power.
Then, from 1.75 turns out to 1.25 turns out, I started loosing power. Weird. So I thought, I was leaning out, and kept needle at 1.75 turns for the longest time.
Finally, one of the more experienced flyers, saw me flying it this way. Walked up to my heli, and gave the needle a good twist. I was in horror, but he insisted I try flying it this way. Man, did those blades spool up a heck of alot faster.
Anyways, he told me to hover it around, then land, and then he kept leaning it out, and we ended up at around 3/4 turns by the time he was done and happy. Then he did the spit test, and said, "see, your engine ain't even hot, the spit didn't sizzle."
They got a sky tach out, and we tach'd out my hover headspeed.
It was at a whopping 1990 rpms.
What I found out is, my head speed is so fast now, that the collective servo doesn't have enough torque to push the blades through the whole pitch range!!!
I guess Hitec 545's aren't enough for a 50-sized heli!!! heheheh.
Oh, btw, it hovered just fine with 1990rpm headspeed, so I don't think my thrust bearing in the head are locking up.
Even more hilarious, was the climbouts were slower than when I had a slower headspeed  heheheh.
Finally, I'm happy to report to you guys, that my glitch problem is gone. I found it. The problem was, I made a modification to the switch mount so it sticks out. However, it wasn't bolted down tight enough, and the bolts were rubbing against the metal side frames. Now I have those bolts completely insulated from the side frames.
Jimmy
P.S. Did I mention this is on a Falcon SEv2, that's why I'm posting it here? heheh.
Now, that I've seen 1990 rpms, I know that my Hawk SE blades were going faster than this when the throttle got stuck on full. I'm guessing maybe 2100 rpms... Glad the engine didn't blow up, that's the engine's redline already. |
. I won't know for sure until a few weeks. I will be busy.
