NM2K

My Feedback: (14)

Don't lose track of the fact that even modern 2.4 GHz R/C flight systems are shock sensitive. Vibration alone can be responsible for some of the problems that I have read about here. Also, the vibration isolation should be applied to all R/C components, including cables, switches and batteries, as well as receivers.

Yeah, I know. The heli guys use double-sided tape to mount their receivers and stuff. Right? How many helis do you think ever reach the 100 flight mark? That's my point.


Ed Cregger

P.S. I'm a heli guy too. I'm flying a Raptor 30 V1 with OS.32SX-H (non ringed) with a JR 8103 system on 50 MHz. Flies nice.

Dr_Chuckie

So here is my setup. FYI the igition switch is above the throttle servo (next to the fuel tank). Th ignition battery is pictured (wrapped in gray foam). I have disco'd (and removed) both throttle and nosegear steering linkage and even tried FM rx still same issue. Servos glitching at more than half throttle. I'm about ready to go electric. Which would be a shame since the engine runs great and will power this plane very nicely.

Antique

My Feedback: (4)

My conversions have the ignition circuit screwed to the backplate on the inside of the mount..Only problems with vibration were when I didn't put enough electronic silicone on the parts...One of the capacitors vibrated loose...The new surface mount technology used by RC EXL fixes the problem, the whole thing is potted in some white stuff...C&H ignitions don't have the problem either, their parts are all stuck together on the board with some clear sealer...
Some people insist on creating problems where none exist....
How many thousand posts relating to oil ratios, oil brands, battery sizes and voltage are there here ?
ONE page from REAL knowledgeable experts on any of these would suffice...

All Day Dan

My Feedback: (5)

Dr., Before you switch over to electric, move your ignition switch away from the throttle servo as far as you can. It looks like the wires from the switch are leading to the rear. What are they going to? Where is the receiver and its antenna? Dan.

Dr_Chuckie

The rx is just aft of the landing gear. It's a Spterum with the remote pickup which is located on the left side of the fuse also behind the landing gear. See th attached photo for details of the ignition switch. I did try bypassing it connecting the battery directly to the ignition and currently the throttle servo is not connected to the rx. I will try moving it as far back as the lead from the ignition will let me. I may then nead to use an extension on the battery as I dion't know if it will balance with that battery that far back.

All Day Dan

My Feedback: (5)

Thank you doc. Where is the ignition battery? It should be all the way forward away from the R/C system. Dan.

Dr_Chuckie

It's right below the throttle servo.

rcacro

In the 2nd picture, the spark plug cap is not fully seated. It should fully cover the plug including the metal base.
It looks like the cap is not the correct one for the sparkplug in the engine.

Dr_Chuckie

It seems that's as far as it will go on. Everyhing on the engine is stock. I will check it though.

Antique

My Feedback: (4)

ALL the spark plug FACTS are at sparkplugs.com
REAL experts...

Antique

My Feedback: (4)

A proper cap on a proper Y82 spark plug covers the hex...Push hard, use some WD40 inside the cap...

fujiman

My Feedback: (133)

i can see 1 problem, the metal plug cap is not on tight onto the plug. some of these fit pretty tight. the cap MUST be pushed all the way onto the plug. check this carefully!!!! if it loose the metal to metal contact with vibration will cause RF noise just like metal on metal linkages etc. that's found in model building 101!!! the plug that came with my brillelli 366 eng. was in my opinion the wrong one. the plug was a taper seat plug and the eng. takes a gasket seat type, leaked oil and combustion gas like mad i have now changed to the correct plug and will have to change the plug lead or the ign. unit. i called brillelli which is out of business and some other people are running it and they said they didn't know why brillelli used that combo. if you really tightened the plug so it wouldn't leak it would ruin the first couple of threads. so just because a certain eng. comes with a certain ign. unit don't count on it being the rite one. as 1 of the posts here said it looks like the wrong plug or the wrong plug cap and at this point i must agree with him

All Day Dan

My Feedback: (5)

Doc, You have your throttle servo surrounded by parts of the ignition system. The switch is above it and the battery is below it. A perfect scenario for coupling into your receiver. Move your throttle servo way back and use a Nyrod for the pushrod. If that doesn't shoot you down then that poorly fitting spark plug cap will. Use dielectric grease or something like that to get the cap to fit better. There may be somethring wrong with the cap if it's that hard to get on. Dan.

NM2K

My Feedback: (14)

SMT (Surface Mount Technology) is similar to 2.4 GHz SS technology in that folks believe both to be a cure-all for all deficiencies. They are not. While SMT is much more robust than than the previous generation of electronic architecture, it is not absolutely bulletproof. Add to that the fact that 2.4 GHz equipment still must rely upon at least one reference crystal in the generation and demodulation of RF signals, then you are right back to having a delicate system that must be isolated from vibration in order to protect that all important crystal. Circuits that do not depend upon a reference crystal can be treated with less concern. Just as 2.4 GHz does not eliminate any chance of interference, SMT does not provide absolutely vibration resistant electronic circuitry. I'm not looking for problems, Ralph. They are there waiting for us. While I am not a degreed electronics engineer, I have qualified as an electronics expert in court in the past.


Ed Cregger

Dr_Chuckie

Ok. So I now have the cap fitting correctly. Will hopefully test tommorrow.

MercerAUST

Where can you get Nyrod pushrods and connectors on the net? Does soemone in Australia have a source

I get the odd glitching, but my LHS does not sell such a poduct even though they sell ignition engines. I have explained my concerns many times, but they don't believe that metal pushrods will cause a problem provided nothing touches the pushrods. I have tried a piece of old fishing rod (fibreglass), but it is not rigid enough for accurate throtttle transition.

Antique

My Feedback: (4)

OK, so all my thousands of ignition conversions are made wrong...
You guys win, I'm done....
Y'all have a nice day, don't NOBODY except former customers call or send me engines...

All Day Dan

My Feedback: (5)

Tower has them. I use the blue one for throttle. Dan.
http://www3.towerhobbies.com/cgi-bin...SM&C=QFA&V=SUL

NM2K

My Feedback: (14)

Just for the record, I wasn't questioning the integrity of you or your ignition systems, Ralph. I was just trying to explain to some folks how we tend to think in terms of absolutes, when they should not be applied to anything without a rigorous series of tests.


Ed Cregger

Dr_Chuckie

Properly seating the sparkplug wire seems to have solved the problem. Ran the engine with zero interference. I will replace the thottle and nosegear steering linkage with nyrod anyway. Once everything is back together I will do some more testing and a good range check. Who knows, with any luck if the weather holds out I'll get to fly it this weekend! Thanks to all who offered suggestions.

fujiman

My Feedback: (133)

always glad to help!!!!

rcacro

Glad we could help. Without the picutures it would have been much harder to diagnose.

John W.

All Day Dan

My Feedback: (5)

Good news! That's what RCU can do for you. I wish I had it around when I needed it. Dan.

FNQFLYER

Any reliable hobby shop sells Dubro, and Sullivannyrods. Check out Airborne or RCMN andnote the addresses of places suchas Wings over the Downs, Col Taylors, Budget Hobbies Addies etc all have them

Dr_Chuckie

Just to let everyone know maidened the Topflite Cessna with the G20 today. All went well except that the engine quit on final. Landed a bit short of the runway and of course ripped the nosegear mounting block off the firewall. Oh well, at least I got rid of the interference issue.