Need BIG TIME help
08-09-2002 | 04:21 AM
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From: Lancaster, PA OH
Need BIG TIME help
I just finished putting together WM extra 300s 80" with ZDZ40 gas engine (my first gas engine/plane). Started the bird today and ran into some problems which I need to resolve before the test flight.
When the engine is running full throttle, I am getting interference when I go around the plane with my TX Futaba 8U - either one stub or full antenna out. This interference only happens at a shorter distance not when I am doing range check from a greater distance. Secondly, the left aileron is shaking a lot and virtually it is difficult to hold it. The prop is balanced to its closest range.
Things which I need to upgrade shortly, changing FM receiver to PCM futaba receiver. Going to put metal gears in hitec 605bb servos for ailerons.
The setup of the plane is as follows:
Mounted the electronic ignition module on the left side of eng. box (looking back from front). Question, is there a distance which I need to keep in between engine and module?
Throttle servo has nylon linkage and sitting 12" away for the ignition module. The receiver is 18" away from the module. The 2 battery packs are 6" away module and are mounted side by side with a gap of 1". Antenna wire is encased in nylon tube and is not touching or near any servo.
Please I will really appreciate if you guys help me out here. Thanks, Jamal
When the engine is running full throttle, I am getting interference when I go around the plane with my TX Futaba 8U - either one stub or full antenna out. This interference only happens at a shorter distance not when I am doing range check from a greater distance. Secondly, the left aileron is shaking a lot and virtually it is difficult to hold it. The prop is balanced to its closest range.
Things which I need to upgrade shortly, changing FM receiver to PCM futaba receiver. Going to put metal gears in hitec 605bb servos for ailerons.
The setup of the plane is as follows:
Mounted the electronic ignition module on the left side of eng. box (looking back from front). Question, is there a distance which I need to keep in between engine and module?
Throttle servo has nylon linkage and sitting 12" away for the ignition module. The receiver is 18" away from the module. The 2 battery packs are 6" away module and are mounted side by side with a gap of 1". Antenna wire is encased in nylon tube and is not touching or near any servo.
Please I will really appreciate if you guys help me out here. Thanks, Jamal
08-09-2002 | 05:30 AM
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From: Marengo,
OH
??
Just for kicks, take your antenna wire out of the plastic sleve! I have had glitches when the antenna is in a sleve. Run your antenna completely out in the open underneith the plane or top of plane. Has any of the antenna wire been exposed outside of the sleve? Are your linkages tight? ARe they heavyduty 4-40 rods? If not, they should be. You are upgrading your 605s, are these old tired or new servos? Do they have "play" in them? Im sure they are new, but just curious. Where are you testing your engine/plane? AT the field or a different location that could be prone to hits? If you change to the PCM receiver, you may get rid of some of this, but you best be careful! From what I have seen, PCM sometimes will mask a problem where FM will not.
08-10-2002 | 01:06 AM
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From: Locust Grove,
GA
Need BIG TIME help
Two things.
Seperate your battery packs so that ALL ignition items are 12 or more inches from all Receiver items.
Make sure that you ignition ground wire is securly fastened to the engine!
Seperate your battery packs so that ALL ignition items are 12 or more inches from all Receiver items.
Make sure that you ignition ground wire is securly fastened to the engine!
08-10-2002 | 03:18 AM
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From: Lancaster, PA OH
Need BIG TIME help
Guys, thanks a lot for all of your inputs. Let me answer the questions and they are good one.
Flymyplane; my 8U is not even 12 months old, I always use 4-40 stuff, all the servos are brand new, the end of antenna wire stick out from the fuse about 1.5", however you suggestions has some weight. At first I started the plane around close chain fence area, where I was getting the max interference, then afterwards I moved it away from that area and things got little better. Many club members had run into same problem around the fence, thanks.
Chris540; ign and rec are 18" apart, thanks.
Geistware; you are the man, Don from Don's hobby in KS suggested the same thing to me and as soon as I moved the battery packs more then 12" away from each other, no interference. However, I did not see any ground wire with ZDZ engine?? Correct me if there should be one.
Thanks again guys
The only problem (hopefully) I had to resolve is that viberation in the left aileron and left wing. I will try another new 605 there to see if that vibration goes off or reduces. Secondly, I had to use packaging tape on the alum tube to make it tight fit in the wings and fuse. What I did though, I used tape at the ends and in the middle section where the tube touches the fuse. Someone suggested to me that I should tape the whole tube to have a consistent thickness, may be that might be the cause of vibration or works to reduce it.
Suggestions are needed again.
Jamal
Flymyplane; my 8U is not even 12 months old, I always use 4-40 stuff, all the servos are brand new, the end of antenna wire stick out from the fuse about 1.5", however you suggestions has some weight. At first I started the plane around close chain fence area, where I was getting the max interference, then afterwards I moved it away from that area and things got little better. Many club members had run into same problem around the fence, thanks.
Chris540; ign and rec are 18" apart, thanks.
Geistware; you are the man, Don from Don's hobby in KS suggested the same thing to me and as soon as I moved the battery packs more then 12" away from each other, no interference. However, I did not see any ground wire with ZDZ engine?? Correct me if there should be one.
Thanks again guys
The only problem (hopefully) I had to resolve is that viberation in the left aileron and left wing. I will try another new 605 there to see if that vibration goes off or reduces. Secondly, I had to use packaging tape on the alum tube to make it tight fit in the wings and fuse. What I did though, I used tape at the ends and in the middle section where the tube touches the fuse. Someone suggested to me that I should tape the whole tube to have a consistent thickness, may be that might be the cause of vibration or works to reduce it.
Suggestions are needed again.
Jamal
08-10-2002 | 01:01 PM
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From: Waynetown,
IN
Need BIG TIME help
Jamal,
The key is to always keep ignition components and RX components separated. As you have now found that out simply by separating the 2 battery packs. It is a good idea to ALWAYS keep these components as far from one another as possible. However, for future reference, you can get them as close as 6" with great reliability. ALWAYS do lots of testing to be sure. Any airplane should be able to work with FM. If you can get good results with FM, there is almost no reason to switch to PCM.
Jeff C
The key is to always keep ignition components and RX components separated. As you have now found that out simply by separating the 2 battery packs. It is a good idea to ALWAYS keep these components as far from one another as possible. However, for future reference, you can get them as close as 6" with great reliability. ALWAYS do lots of testing to be sure. Any airplane should be able to work with FM. If you can get good results with FM, there is almost no reason to switch to PCM.
Jeff C
08-11-2002 | 10:47 AM
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From: Locust Grove,
GA
Need BIG TIME help
Jamal,
There MUST be a ground of some type. What I don't know is if the ground wire for the cap is enclosed or not. I your ZDZ should have a Falkon ignition unit. I went to there site and D/L the manual. (http://www.falkon.cz/English.pdf)
From the manual, their isn't a ground connection. It looks as if it is incorporated into the spark cable and ingnition module so you should make sure the cap is tight on the plug. Use a Tie-wrap or hose clamp to secure the cap to the plug and you should be fine.
There MUST be a ground of some type. What I don't know is if the ground wire for the cap is enclosed or not. I your ZDZ should have a Falkon ignition unit. I went to there site and D/L the manual. (http://www.falkon.cz/English.pdf)
From the manual, their isn't a ground connection. It looks as if it is incorporated into the spark cable and ingnition module so you should make sure the cap is tight on the plug. Use a Tie-wrap or hose clamp to secure the cap to the plug and you should be fine.
