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04-28-2013 02:28 AM  5 years agoPost 1
arcticflyer

rrNovice

Prince Albert, Saskatchewan, Canada

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I completed my G20 last week and began breaking in the motor with several runs. ALWAYS started on two to three pulls never more. Last week the maiden flight went perfect and yesterday I flew it for the first time again three pulls.
Took it home charged the batteries then today took it to the field filled the tank and I pulled and pulled NOTHING....no spark!
Two stinking flights and to be frank I am totally disgusted. Stopped at the LHS and picked up a second EI unit and hall sensor and will work on it tomorrow....is this common with these RC EXL CDI's and does someone make a quality unit.
I mounted it with zip ties to the front tray...could vibration have damaged it?
Thanks guys for letting me rant a bit am not usually like that but I worked all winter in this thing spent lots of money and it won't start.

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04-28-2013 05:53 AM  5 years agoPost 2
RM3

rrElite Veteran

Killeen, Texas - USA

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I mounted it with zip ties to the front tray
well to be honest if you did not wrap it in some sort of vib absorbing foam...the front tray is about the worst place for the CDI...granted there is no other good place to put it.

the tray sticks out in front and is basically unsupported...under certin vib frequencies, the tray will resonate with whatever is mounted to it and vibrate to the point that its a blurr...

I noticed that on my G20 and went ahead and used two small strips of aluminum angle to brace the whole front end of the tray to the rest of the front side frames...it made the front of the tray rigid....also the CDI i have is surrounded by vib foam...

now the stock CDIs are pretty much "potted" solid (which is why thier soo darned heavy) so they tend to take vibs OK but not great...you positive the CDI died? and its not a wire issue or external to the CDI?

showing a preference will only get you into trouble, 90% of everything is crap...

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04-28-2013 12:49 PM  5 years agoPost 3
arcticflyer

rrNovice

Prince Albert, Saskatchewan, Canada

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CDI
THANKS RM3 - I am going to do some tests today, was to disgusted to do anything with it last night.
I will do something to try and isolate the next one from vibs...I guess what really puzzles me is it flew great the day before and with no changes it would not work the next day...sure glad it did not fail in flight.
Will post up all test results on wiring, hall sensor, and CDI.

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04-28-2013 06:20 PM  5 years agoPost 4
arcticflyer

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Prince Albert, Saskatchewan, Canada

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Did some testing!
Got one of the little CDI testers...highly recommend them and tested the CDI and it worked perfectly.
So I removed the Hall Sensor and noticed right away that the fan had come in contact with it and wore most of the top plastic away.
Turned the heli over and noticed that many of the plastic fan blades had come in contact with the sensor as they were also worn on the bottom.
Don't know how this happened as I spun the fan after the initial install and made sure none of the blades contacted the sensor. All I can think is that with the heat of the first few tanks of gas that the plastic fan may have warped just enough to come into contact with the sensor. don't know why the sensor won't fire as the magnets are still there and the sensor is still in one piece only the plastic top is worn away.
I think I am going to order a metal fan today...just hate to have to take the whole heli apart to make the change but....ya gotta do what ya gotta do.

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04-28-2013 09:43 PM  5 years agoPost 5
arcticflyer

rrNovice

Prince Albert, Saskatchewan, Canada

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BOOM!
Changed the Hall sensor to a new one and BOOM first pul was a back fire and the second pull the motor started and ran like a top!
Still think I am going with the metal fan when they are in stock again but at least it is running.

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04-29-2013 01:33 AM  5 years agoPost 6
strat1960s

rrApprentice

San Antonio Texas

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Artic.

I don't think they make the metal fans anymore.
Someone may still have some in stock, but I couldn't find them on the web site.
I wonder why???

Ted

I always have fun. Some times are more fun than others.

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04-29-2013 02:23 AM  5 years agoPost 7
arcticflyer

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Prince Albert, Saskatchewan, Canada

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I can't find any either so I guess we are stuck with plastic.

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04-29-2013 02:37 AM  5 years agoPost 8
strat1960s

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San Antonio Texas

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Let me do a quick search. Do you know the part number??

I always have fun. Some times are more fun than others.

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04-29-2013 02:49 AM  5 years agoPost 9
strat1960s

rrApprentice

San Antonio Texas

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http://www.modelhelicopters.co.uk/r...ng-fan-hub.html

The above company shows that they have these in stock. It is overseas though.

Ted

I always have fun. Some times are more fun than others.

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04-29-2013 04:31 AM  5 years agoPost 10
RM3

rrElite Veteran

Killeen, Texas - USA

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"I wonder why"

I think it has something to do with the idea that the metal fan does not move as much air as the plastic one, not sure...the plastic one has more fins and on both sides...the metal "upgrade" one has less fins and only on one side...so that makes sense...

I have two engines (one a back up with shroud, plate and fan already to swap out) and never had an issue with them...

as for not being in stock, not sure why that would be either...I waited for 3 months for the FBL head to be instock...maybe if you request from a Century supplier they can find one?

IMO the metal one was made better, balance wise at least, OTOH the plastic one needed some balancing work done to it andyou could not dial indicate off of the outter rim to check for center...I had a bad experience with the first plastic one...still have scarred knuckles to show for it.

showing a preference will only get you into trouble, 90% of everything is crap...

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04-29-2013 04:45 AM  5 years agoPost 11
strat1960s

rrApprentice

San Antonio Texas

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So if they made a metal fan matching the plastic fan design it would be the best of both worlds. Makes sense, right?

I always have fun. Some times are more fun than others.

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