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09-23-2009, 04:05 PM | #1 |
RCC Contributor
I am: John M.
Join Date: Apr 2007
Location: Ancaster, ON
Radio of choice:
Futaba # of RCs: 5
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Vibration, Ignition or ?
Currently getting my first "gasser" (50 cc's) " good to go". Everything went fine during test #1 except when I started the engine. The engine started right on que but as soon as it did, all my servos went hay wire. I immediately shut things down. Again, up until the engine actually started, everything was perfect. Do I have a vibration problem? Is my electronic ignition causing electrical problems once it starts to fire? Or, is their something else wrong that I have not thought of?
So far, I am treating it as a vibration problem and have changed the position of the receiver and provided more foam. Currently using an 8 channel Futaba, FM reciever but will test with it and a PCM one next time. Would appreciate some input before Test #2. The engine is a 50 cc - DL which has been broken in and used before and the plane is a Wild Hare 540. The servos are new, Hitec - High Torque Digital with lesser ones on the throttle and choke. During test #1, I was using a 6.6V - A123 at the reciever and a 4.8 V NiMh on the ignition. Thanks
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Ancaster Sport Flyer... "your attitude affects your altitude!" Last edited by JohnM; 09-23-2009 at 04:07 PM. Reason: grammar |
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09-23-2009, 04:19 PM | #2 |
RCC Master Contributor
I am: Geoff B
Join Date: Apr 2007
Location: Watrous, Sk
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Re: Vibration, Ignition or ?
make sure the spark plug cap is on all the way... i had this same problem. They are very hard to push in all the way. Also make sure all your wiring for your ignition (ie; switches, battery, wires) are kept away from the receiver and all components for the receiver. isolation is the key. Keep those 2 systems as far apart as feasible..... once i moved the wiring away and checked my plug cap i stopped having problems...
hope this helps.. geoff
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09-23-2009, 08:50 PM | #3 |
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I am: Bill M
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Location: Kitchener ON.
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Re: Vibration, Ignition or ?
Go with the PCM reciever, had this problem with a FP 127 futaba reciever on FM, switched to a 149 pcm and all problems cleared up as well as better range checks.
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09-23-2009, 09:06 PM | #4 |
RCC Supreme Contributor
I am: Todd M
Join Date: Jun 2005
Location: Ontario
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Re: Vibration, Ignition or ?
Before you switch the receiver to PCM you really should get the issue of servo twitch worked out. All the PCM is going to do is mask the issue.
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09-24-2009, 08:21 AM | #5 |
RCC Senior Contributor
I am: Bob R.
Join Date: Sep 2005
Location: Chatham, Ontario
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Re: Vibration, Ignition or ?
On one model I had to resort to putting foil wrap on the firewall and had all of the engine electrics in front of the firewall. This reduced the electrical noise to a satisfactory level. On that particular engine I had to use a " resistor" type plug as well. It really did make a big difference.
To test if it is rx interference pull the receiver out of the plane and hook a servo up to it. Start the engine and then move the receiver away from the engine. You should get to a point where there is no interference. I needed 14 inches of separation on that model. PCM receivers just masked the problem. Get it working properly with a ppm receiver first. |
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09-24-2009, 09:31 AM | #6 |
RCC Contributor
I am: John M.
Join Date: Apr 2007
Location: Ancaster, ON
Radio of choice:
Futaba # of RCs: 5
Feedback: 1 / 100%
Posts: 331
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Re: Vibration, Ignition or ?
Thanks for great advice! My friend Bill A. called me and asked about the throttle and choke linkages. I told him they are metal rods and the servo horn for the choke is metal. We both agreed to change everything to non-mental before next test. Will also employ the above input. Thanks again for your suggestions. . . I am learning a lot in a short period of time... Cheers
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Ancaster Sport Flyer... "your attitude affects your altitude!" Last edited by JohnM; 09-24-2009 at 09:33 AM. Reason: grammar |
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09-24-2009, 10:32 AM | #7 | |
RCC Supreme Contributor
I am: Ron O.
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Re: Vibration, Ignition or ?
Quote:
Ron |
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