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HomeAircraftHelicopterHelicopter Main Discussion › TJ Pro not holding?
02-09-2008 07:27 PM  10 years agoPost 1
Kiwimark

rrApprentice

Mandurah, WA - Australia

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hi all I hope you can help.
I have a Raptor 50se, hyper 50, TJP, and am running 10% nitro.
When hovering, all that I can do at the moment, the TJP seams to let go for a split second, I can hear the rpm climb & the tail moves to the right. I am using a 9c radio with the gain set to 70.2% giving me a head speed of 1600. I do have 82.7% as well for 1950 head speed but haven't tryed that yet.
My reciver is a FS8 & is says that there have been no bad frames from the transmitter. Every now & then the motor will lose power as well.
The engine seams cool enough, can hold finger on backplate for 4 to 5 seconds, longer if brave.
Thanks for any idears.
Mark

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02-09-2008 07:31 PM  10 years agoPost 2
hockeyrules99

rrApprentice

topeka KS

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magnet still there? just finish some repairs on it? when you spin the starter do you see the light flashing on TJ?

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02-09-2008 07:42 PM  10 years agoPost 3
Kiwimark

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Mandurah, WA - Australia

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Hi the magnets are still there, haven't need to repair it yet, & the red light flashes, the TJP works fine for aprox 1/2 a tank then starts this nonsense.
Cheers

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02-09-2008 08:00 PM  10 years agoPost 4
allns47

rrKey Veteran

Richmond IN.

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is your engine running smooth without the tjpro on..If your engine is out of tune it will cause the tjpro to do this...

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02-09-2008 08:05 PM  10 years agoPost 5
Kiwimark

rrApprentice

Mandurah, WA - Australia

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It seam to be for the first 8 min then it misses every now & then, it does the big rev thing first, could my glow plug be on the way out? It starts first time, every time.
Cheers

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02-09-2008 09:26 PM  10 years agoPost 6
allns47

rrKey Veteran

Richmond IN.

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it could be your glow plug,,,Which one you using....I glow plug can still glow and be bad...

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02-09-2008 09:33 PM  10 years agoPost 7
Kiwimark

rrApprentice

Mandurah, WA - Australia

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I'm using the one that came with the engine os8, the engine has only had about 10l of gas through it.
Cheers

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02-09-2008 09:35 PM  10 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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almost sounds like your one-way bearing is slipping. you might want to take it out and clean it up, lube with a few drops of ATF.

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02-10-2008 04:00 AM  10 years agoPost 9
xxl

rrApprentice

The planet Earth

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check your sensor wires those could be bad
TO do this
postion magnet or strip above sensor

jiggle wires and watch the light to see if it flickers
if it dose replace sensor

my friend had this problem replaced the sensor and that fixed it

Also do you fly in stunt mode all the time ?

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02-10-2008 04:27 AM  10 years agoPost 10
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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I would have to go with sensor if you change and it is not the problem no worries $ well spent you will need it someday anyway

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02-10-2008 07:15 AM  10 years agoPost 11
Kiwimark

rrApprentice

Mandurah, WA - Australia

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Cool thanks for the advise I will test the sensor tonight & the one way brg.

xxl not sure what you mean buy stunt mode, just hovering at the moment but want a constant head speed with the TJP, makes it heaps easier.

Cheer

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02-10-2008 12:19 PM  10 years agoPost 12
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Stunt is another word for idle up (normal, idle 1 ,idle 2, throttle hold)

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02-10-2008 02:26 PM  10 years agoPost 13
JuanRodriguez

rrProfessor

The Villages, Florida

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Kiwi,
Another possibility is that the TJP is "on the edge" between on and off.....

If you used the RPM calculator found on the website or in the paperwork to do your setup, then that may possibly your problem. Those RPM calculators are known to be wrong.....ie, the recommended percentage settings will be wrong and sometimes way off depending on how the unit was calibrated (by the end user)....

Just remember that your motor RPM has to be AT OR ABOVE your TARGET headspeed to begin with otherwise you'll have similar trouble....And also remember that your motor and setup has to be right to begin with. The TJP or any other gov will not be a substitue for a poorly tuned motor.

So, if you want your TJP to maintain 1700 RPM (for example) then you need to adjust your pitch/throttle curves to give you AT LEAST 1700 OR ABOVE ........BEFORE you engage your TJP..... For this example, I would adjust the curves to give me 1750 or even 1800 and then use your ATV adjustment to give you the desired lower headspeed once you engage the switch........ Don't worry about the recommended ATV numbers.... Use whatever number YOU come up with to give YOUR desired headspeed.....

The reason for using a much higher headspeed is that I want to "hear" the TJP engage by the sound of the lower headspeed once I throw the switch.....

You can do it the other way around (lower to higher once engaged) but then you stand the risk of not being AT OR ABOVE your target headspeed without the unit engaged....

Hope this helps ya.....

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02-10-2008 02:43 PM  10 years agoPost 14
donthomas

rrApprentice

gibsonville, nc usa

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I have had oneway bearing fail and act just like this. I'd check it very close.

Don Thomas

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02-10-2008 11:50 PM  10 years agoPost 15
Kiwimark

rrApprentice

Mandurah, WA - Australia

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Hi guys thanke for the help, I think I found the problem, the fuel I was using is about 3 months old, mixed up a new batch this morning, then had to richen up the engine, this fixed the missfire issue, the thing that sorted out the TJP was what Jaun said my throttle curves were not high enough for the TJ to engage full on at hover @ 1600rpm, it was droping in & out but @ 1900 rpm it held fine. I still had my curves setup from before I put the TJ on. All I have done now is increase the curves over 25% throttle by 5% & it all works good as well as I can still fly without the TJ engaged.
Got 10 l in today.
Cheers
Mark

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02-11-2008 12:36 AM  10 years agoPost 16
JuanRodriguez

rrProfessor

The Villages, Florida

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Good deal, Mark !!
Glad you got things sorted out.....

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