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HelicopterGasser Model RC HelicoptersOther › Zenoah 231 surging during hoover
08-11-2007 01:09 AM  10 years agoPost 1
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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My Spectra G has a Zenoah 231 and it flies great but during hoover it will surge several times during the approx 10 min flight. My plug looks ok for mixture so whats going on here. Its an xcell spectra gn with a 7.15 gear ratio. I'm trying to hold the rpm to around 11000 rpm but these surges kinda scare me, they jump up to about 12500 in a matter of a couple of secs. They are quick and then fade over approx 20 to 30 secs (see chart), when they happen I think something is going wrong, makes flying a little more nerve wracking.
Plug looks good, maybe even a little hot.

Any ideas ??

There were three in the chart, I only marked two, but one is also approx middle of the two marked.

Click on blue sqr if no chart shows.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 04:40 AM  10 years agoPost 2
helicenter

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Winter Haven Fl.

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surge

How do you know there is no throttle change ?

Doug

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08-11-2007 05:05 AM  10 years agoPost 3
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Well, I guess I mean I made no collective/throttle change on the left stick. I will try this again tommarow and setup the eagle tree to monitor the servo commands on the throttle and the three CCPM servos.
My stick still has the clicks on it and I made an effort not to move it during these surges. When the engine / head speed increases I don't remember any climb tendency, which doesn't make sense.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 05:12 AM  10 years agoPost 4
shuttlepilot

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Mullins, South​Carolina

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Have you touched the clutch bell after this has happened? Maybe the clutch is slipping somehow. The reason I say this is you stated that it doesn't climb when this happens. If the clutch is slipping, you should be able to land after the surging then check the clutch. While the engine is running it should barely be warm. If it's hot, it's slipping. If you shut down before you check it, the heat will transfer up into the bell pretty quickly, so be fast.
I'm just throwing out some ideas. I wouldn't think it would slip in a steady hover.....but stranger things have been known to happen..

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 05:16 AM  10 years agoPost 5
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Good point, but I defenatly hear the head speed jump from about 1450 to 1800 rpm and I previously checked this surge with an optical tach on the blades. So I don't think the clutch is slipping but I will feel it tommarow just to be sure..
Thanks
Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 05:20 AM  10 years agoPost 6
shuttlepilot

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Mullins, South​Carolina

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Okie. I was thinking that the blade speed wasn't increasing. Have you checked to make sure that there weren't any bubbles showing up in the line? Mine started doing that one time when the tank would start getting low. This was before I put in a walbro felt clunk and everything was dialed in and as smooth as it is now.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 05:28 AM  10 years agoPost 7
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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My clunk is one of those soaker types, just not felt, but still I will check this, thanks.It does happen on full tank, half tank and low tank. ( I have already carefully checked all fuel and return lines for leaks, including the clunk pickup line.)
Other things I check regurlarly:
Exhaust tight.
carb and all fitting tight.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 05:34 AM  10 years agoPost 8
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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Just curious, when this surging happens is your primer bulb empty?

Some folks say that this does not effect running, but I have seen my engine start to run lean when this bulb would be empty.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 05:35 AM  10 years agoPost 9
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Another good thing to check.
Thanks

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 06:06 AM  10 years agoPost 10
FloridaHeli

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jacksonville,​florida

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Predator G23 surging today

I experienced a surge on my Predator G23 gasser today. Tweeking the low or short adjustment screw went from 1-1/4 turns to 1-3/8 turns and surging stopped. It was too lean and when Stator Gator signaled GY-611 for more fuel it was not there. She bogged then sped up.

So, bottom line it was running lean. You might try opening mix screw a little.

Good luck

This hobby is WAY too expensive!!

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08-11-2007 06:09 AM  10 years agoPost 11
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Will try that. From my plug reading I am pushing the engine on the lean side and was about to richen up the low speed. But I am not running any gov just yet. Still I'll give it try..
Thanks
Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 02:11 PM  10 years agoPost 12
helicenter

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Winter Haven Fl.

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surge

Where are you in Fl.?

Doug

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08-11-2007 03:18 PM  10 years agoPost 13
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Just West of Sanford.
Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-12-2007 10:16 PM  10 years agoPost 14
Toxic Al

rrApprentice

chuluota, Fl

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richen the high speed a little bit, the spectra hovers on the high speed needle. If the motor gets lean and the motor gets hot can surge. peace, Toxic Al

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08-13-2007 02:53 AM  10 years agoPost 15
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Thanks all. It was way to hot today to try any of these suggestions, maybe tomarrow.

Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-13-2007 03:42 AM  10 years agoPost 16
Excalibur

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Destination: Earth

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GFreak:

I had a similar problem on my PGasser some time ago. It was as simple as changing out the throttle servo. I can't help but wonder if the throttle linkage to the servo from the engine is carrying alot of vibration and causing failures.

If you have another servo to try, give it a shot. It is easy to change out and could yield the greatest benefit.

The only other things I can think of are checking to make sure your carburetor mount is solid with no leaks (Z-RC insulator?), and check to make sure your muffler hasn't loosened up. That could cause erratic tuning problems.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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