160.00 Throttle servo?

Crashagain · Posted: Mon Nov 29, 2010 1:27 pm Post subject: 160.00 Throttle servo?

Now I got you wondering, huh? who would buy a servo that expensive.....
ME!! I just thought I'd share an experience so in the future you will look before you spend money..
A couple of weeks ago I was at the field flying my 600. Just having a great day. On a flyby I heard the motor cutting in and out, like it was sucking air. Any of you guys who have flown nitro planes, know the sound.. I land, take apart what I can on the carb, and blow it out and put it back together. Hmmmm still doing it. I take out the clunk line and change it, install a new filter and change the fuel line, and it's still running like crap. So I stop flying that heli for the day and work on it later. I get it home and pull the motor, take the carb off and in the process, notice that one of the screws is stripped. CRAP!!! I drill it a little bigger, take a tap and cut off the tip to make it a bottoming style tap and put in some new threads. Drill the carb out to take the bigger screw and put it back together. I go out front to do a test hover and it's worse then before, it's really cutting off and on bad now. I figure that after 25gallons of fuel and 1.5 years of use, I wore out the motor. I am on my 3rd set of bearings too. So I take it back apart and wait till the weekend.
The next saturday I go out and buy a new OS Hyper 50. I put it in at the field and get it all setup for the first flight. I start up my new motor and take the heli to the flight line. It's blubbering rich, spitting fuel everywhere and I start to spool up the motor......... Well, this is what I hear...
"WAH WAH WAH WAH WAH", It's doing the same thing, but worse. It's so bad the tail is kicking out 180deg every time it rev's back up. I'm lost now, I have changed everything, what's left??? My friend happened to be standing on the left side of the heli and calls me over, he says " watch your throttle servo when you spool up.." So I do, as I start to spool up the heli, the servo starts twitching all over the place... I did all this work for nothing, ALL OF IT, Nothing needed to be done except change the servo. But no!!!!! I don't look everything over, I just assumed that it was a dirty carb.
The moral of the story??? Don't ever assume anything, inspect everything that could cause your symptoms, everything!!! Had I just grabbed the servo arm and tried to move it while the heli was powered on, I would have been able to move it and known that it was bad.
And that is the story of how my throttle servo cost me 160 bucks...

Trouble · Posted: Mon Nov 29, 2010 5:00 pm Post subject:

Now THAT is a very enlightening story! I guess on the bright side you won't have to worry 'bout replacing your motor for a long time. And in a way you make me feel better knowing that even the Pro's are susceptable to boo-boos' once in a while. Wink

You got me though, I was trying to think what it could be b4 I reached the end of your tale,(I never read the end of a story first) I was thinkin', "it was bad fuel", I never realized that carbs had to have a servo, I guess that is the servo that makes you require a 7 ch. radio? The Governor servo?? but you said "throttle" servo, didn't ya...I will tell ya lil' somethin' here..I was toying greatly with the idea of getting a 600N last week. I was THAT >< close! But tried usin' my brain, and man that hurt Rolling Eyes

, So I started thinkin 'bout cost (money) from the time I get it 'til...whenever. I want a bigger heli, and no, not a EXI 500, *cough*. Wink

But, the 500 class is a bigger Heli, possibly big enough to handle a bit of wind and be more stable,... give me the feel of a big bird without the big bird cost. We will see. Hey, there is a question 'bout that though, Do you think you could use 450 electrics to hover a 500? I mean just hover around a bit, nothing fancy of course. Thx for the story though, that actually was a well written lil' tale, I was really into it there Cool

Crashagain · Posted: Tue Nov 30, 2010 3:52 am Post subject:

Trouble · Posted: Tue Nov 30, 2010 4:49 am Post subject:

yea, I would love a 600, for sure a 700, but..right now, nah, just cant afford it, I ve studied the prices, that is a big jump, lol, a real big jump, but I will this coming summer. Thx for the info Crash, was just wondering.

Dumb Thumbs · Posted: Wed Dec 01, 2010 12:09 am Post subject:

I'd like a 600 or 700 fbl myself (in case Santa is watching this forum) But I don't think I could handle the OS factor if I crash one.