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Fugi Imavc 32 EI Interference - 5/5/2006 6:30 AM   
MicroPlanes


 

Posts: 3
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Joined: 1/22/2006
Last Login: 2/15/2013
From: Olean, NY, USA
Status: offline 		I have just purchased a new Fugi Imvac 32 EI from Tower Hobbies for a Bud Nosen Citabria. I have a Hitec radio using PPM and followed all the standard practices when installing a gasser in a model. I have interference when the engine is running while do a range check and can only get about 20 to 30 feet away from the plane before the interference starts. I have tested both at the field and home with same results. I have separated the speed sensor and ground wire from the spark plug wire with no success. I removed any possible metal to metal contact on the aircraft. I even tried installing a wire braid over the spark plug wire and grounded via a hose clamp to the base of the spark plug. Doing so I could then not start the engine. After this, I removed the hose clamp and isolated the braid from the engine and the engine would start. I then connected a test lead from the shield to the engine and noticed just prior to contacting the engine a spark could be seen. From what I can tell I have a good ground from the EI to the engine. I have tried 3 receivers with one being on a different channel (Channel 15 and 45) with no success. I have moved the receiver antenna in all directions with no success as well. I tried unplugging all servos in several combinations. The receiver is more than 12 inches away from the EI. I am at my wits end trying to determine the root cause of this interference issue. Any suggestions would be greatly appreciated.

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RE: Fugi Imavc 32 EI Interference - 5/5/2006 6:18 PM   
Bax


 

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From: Champaign, IL, USA
Status: offline 		The ignition noise getting into the receiver could be caused by a leaky ignition system. You may need a new control box with spark plug lead, it may be a bad spark plug, it may be that the ignition battery's too close to other R/C system components, and so on. If the engine's sent here, we can analyze what the difficulty may be.

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Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

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RE: Fugi Imavc 32 EI Interference - 5/6/2006 1:59 AM   
MicroPlanes


 

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From: Olean, NY, USA
Status: offline 		Bill,

Thanks. I will be sending you my gasser this weekend.

Microplanes

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RE: Fugi Imavc 32 EI Interference - 5/16/2006 4:31 AM   
MicroPlanes


 

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From: Olean, NY, USA
Status: offline 		Bill,

I sent the engine in to the service center as requested. In turn they replaced the electronic ignition with a new one and stated they could see no problems with the engine. Well, I just received the engine today and was excited to give it a try. Much to my dismay, the engine still to the best of my knowledge causes a large amount of EMI. In turn, this is causing all channels on the RC radio to randomly fluctuate when I am only 20 to 30 feet from the engine doing a radio check. I did another test where I set another known problem fee RC plane 3 feet away from the Fuji engine and had my transmitter set to this plane. I then completely turned off the radio on the plane containing the Fuji engine. Next I proceeded to start the Fuji with the throttle manually set slightly above idle. I in turn, walked away from the two planes with the transmitter antenna collapsed and again could not get much farther than 30 feet. The radio on the second plane then showed signs of EMI interference. I even completely extended the transmitter antenna and still showed signs of interference. I also gave the service center a call. The service person on the phone stated RC equipment is not used during the testing and service of a given engine. From my point of view, I am not sure if the engine was actually test for my symptoms unless some type of EMI testing equipment was used to verify the EMI radiated from the engine is within tolerance and not in the RC equipment frequency range. I will be calling the service center later tomorrow to see what's next. I was informed by another person at my club who has a friend with a Fuji 50 EI engine and is experiencing the same issues that I am having as well. I plan to get in touch with him to see if he has resolved this issue. Look forward to your reply.

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RE: Fugi Imavc 32 EI Interference - 8/2/2006 10:59 PM   
pettit



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From: Durham, NC, USA
Status: offline 		I am also experiencing the very same problem with my BT-32EI engine on a GP Super Sportster.

This plane, plus the engine itself, will be reviewed in an upcoming issue of R/C REPORT Magazine.

I can get about 50 feet of range using PPM equipment and PCM radio (Futaba) locks out at maybe the same distance.

The ignition box and battery are stuffed up against the inside of the firewall and the closest thing to it in the radio equipment is the throttle servo which is 13" behind the ignition box.

I haven't changed the plug yet, but I will do it tonight.

Maybe a faulty ignition box, Bill?

< Message edited by pettit -- 8/3/2006 3:39 PM >

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WACO Brotherhood #168

If You Can Not Stand Behind Our Troops, please Feel Free To Stand In Front Of Them!!!!!

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RE: Fugi Imavc 32 EI Interference - 8/2/2006 11:36 PM   
Joedaniwhite


 

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From: Millbury, MA, USA
Status: offline 		Hi Dick,

I feel your pain. You have most likely have done nothing wrong. It's simply not the greatest ignition system and this message will get pulled so I hope you get it first. RCU doesn't like me bashing the Fuji system on their help forum but facts are facts and no one wants to own up.

If you can get 50 feet, you are safe to fly according to the AMA. I would run a PCM receiver though with a fail safe throttle to idle.

I experienced the same problem with my Fuji50EI. I have a text book radio installation and tried everything on the planet short of replacing the engine. Nothing is within 18 inches of that engine. The best I can do is about 70 feet. With the engine off, I can get so far away that I can't even see the controls move anymore.... This cost me a lot of time and money. I'm still fuming!

In the future, I will only buy engines with a steel braided ign lead and clip on metal boot over the plug. My brother has his throttle & choke servos mounted right on the engine box of his plane (3 inches from the eng.) and gets about 175 feet of range with no glitches. He has shielded ignition system. Hope this helps!

Take care,

Joe

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RE: Fugi Imavc 32 EI Interference - 8/3/2006 12:00 AM   
bradp


 

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From: sutton, MA, USA
Status: offline 		hey guys,

im in the same boat as joe and you others. i have the 50EI also. when i first put in analog servos, i couldnt get far without gitters. then did some tests with digital servos.this made a big difference. it would of been unflyable with the analogs in there. too bad fuji wont offer a shielded/braided ignition box/wire.. im not too happy spending all that extra doe on all the servo's.

luck to you

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RE: Fugi Imavc 32 EI Interference - 8/3/2006 2:55 PM   
pettit



Posts: 2695
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Last Login: 5/23/2013
From: Durham, NC, USA
Status: offline 		Interesting. My little Fuji 25 four cycle ignition and the Fuji 43 ignition system worked just fine. Plenty of range.

But I did seem to fix the range problem.

I replaced the spark plug with a brand new one.

I moved the ignition box and battery as far forward as possible in the fuselage and it's right against the back of the firewall.

The closest part of the receiver system is at least 13" behind anything connected to the ignition system.

I also moved the receiver antenna outside the fuselage, running it to the tip of the stab.

I also relocated the aileron wires so they don't come out of the wing close to the front. Now they angle back directly to the receiver.

At 100 feet and engine running at any speed, no interference at all.


Digital servos working better than analog? That's absolutely unbelieveable. There's no difference in the way that they work, as far as "rejecting ignition noise".

They don't work at RF frequencies. They work at very low frequencies, and therefore should not be effected by ignition noise.

Maybe the servo leads were closer to the ignition system prior to changing to digitals.

I think you may have accidently fixed something else and credit it to the digital servos.

I won't say it's impossible, but I could.

< Message edited by pettit -- 8/3/2006 3:45 PM >

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Dick Pettit
WACO Brotherhood #168

If You Can Not Stand Behind Our Troops, please Feel Free To Stand In Front Of Them!!!!!

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RE: Fugi Imavc 32 EI Interference - 8/3/2006 7:03 PM   
Bax


 

Posts: 17300
Score: 169
Joined: 4/26/2002
Last Login: 5/24/2013
From: Champaign, IL, USA
Status: offline 		As we always state. If you have a difficulty with your engine, WE NEED TO SEE IT!!!

We want to help in any way we can. We cannot diagnose a problem online. We can only offer suggestions you can try on your end to reduce/eliminate the problem. If they don't work, you need to send the engine to us so that we can see the problem. If you don't do that, but then complain online, then, yes, your post will get deleted. This is not a discussion forum, but a place to ask specific questions for us to answer. If you wish to just vent, it should be done in the general Gas Engines forum.

Thank you.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

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