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HomeAircraftHelicopterThunder TigerOther › Loosing "grip" when doing engine-demanding manouvers
02-12-2006 01:12 AM  12 years agoPost 1
Dr.Phil

rrApprentice

Oslo, Norway

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Hi guys.
Need some advice with my Raptor.
I am experiencing some strange problems, and I have tried anything I can think of.
Several times now, while performing manouvers like tail slides, tic tocs etc.. my hyper suddenly starts to scream (increases rpm's) at the same time the heli falls towards the ground! At first I thought it was something to do with clutch or bell. But I changed them both but still have the same problems.
The engine doesn't stop when this happens. Suddenly it catches again and everything seems ok
The hyper also is very rich in idle, even if I lean both needles.


I have :
changed fuel tubes
glow plug
changed clutch and bell
checked pinion (locktited)
Edit : checked fan, put locktite on and installed it again

What should I check next??

Raptor50V2, Hyper, revlock


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 01:32 AM  12 years agoPost 2
TAZZY

rrVeteran

Westfield,MA

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it sounds like it could be going into failsafe and your throttle setting in failsafe mode might be at a higher throttle setting then what you fly at. try changing out the reciever.

GDay

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02-12-2006 01:41 AM  12 years agoPost 3
RobRoy

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Huntsville, Alabama

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Sounds like your engine is kicking and running backwards. A sign of a very rich engine.

Ignorance is curable, stupidity is for life.

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02-12-2006 01:43 AM  12 years agoPost 4
TAZZY

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Westfield,MA

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i don't think it is capable of running at such a high RPM going backwards, it's usually a sluggish sound when running backwards.

GDay

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02-12-2006 01:52 AM  12 years agoPost 5
Dr.Phil

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Oslo, Norway

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Thanks for your replies
I agree with Tazzy. I have 2000rpm on idleup2 and don't think it can start bacwards at this speed.
My failsafe is set to 20% throttle. But when this happens it seems like it increases??


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 01:52 AM  12 years agoPost 6
RobRoy

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Huntsville, Alabama

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Not true.....a guy at my field today had to do an auto, because his OS37 in a hover hickuped and started running backwards.....you should have heard that thing screaming when he applied positive collective at the bottom of the auto.....he faild to hit throttle hold.

Ignorance is curable, stupidity is for life.

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02-12-2006 01:54 AM  12 years agoPost 7
TAZZY

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Westfield,MA

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we'll see, just wait for some more replies.

GDay

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02-12-2006 01:56 AM  12 years agoPost 8
Dr.Phil

rrApprentice

Oslo, Norway

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Hmm.. ok Robroy. Maybe it is possible. But isn't it strange then that IF it starts backwards at 2000rpms I suddenly can control it again?

Tazzy, I can control all other functions so I don't think failsafe is the problem


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 01:57 AM  12 years agoPost 9
TAZZY

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Westfield,MA

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wow, then you got me. that's very wierd.
good luck

GDay

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02-12-2006 02:00 AM  12 years agoPost 10
Dr.Phil

rrApprentice

Oslo, Norway

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that's very wierd
Yeah, I know.
Only thing left I can think of is stripping the engine to check, but... I am not sure this has anything to do with it


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 02:02 AM  12 years agoPost 11
DOperchal

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Ft Rucker, AL

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My only idea would be to check to see if maybe the nut holding the fan/clutch assembly on the motor is loose. It could cause the fan to possibly strip the threads and might cause it to freewheel, hence disengaging the clutch and overrevving the engine. Wouldn't hurt to drop out the engine and check.

Peace through superior firepower

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02-12-2006 02:03 AM  12 years agoPost 12
RobRoy

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Huntsville, Alabama

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What's strange, is that Rockohaulic, here in RR had this exact same problem today, his caliber would hickup and start running back wards....perfectly.....then would hickup again and go back to normal...I seen this several times just today. If anyone finds the fix for this...please pm rockohaulic.


.

Ignorance is curable, stupidity is for life.

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02-12-2006 02:05 AM  12 years agoPost 13
Dr.Phil

rrApprentice

Oslo, Norway

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Thanks DOperchal
I actually had the engine out yesterday. After I checked the pinion I even removed the fan, put locktite on and installed it again.
But experienced the same today anyway.


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 02:10 AM  12 years agoPost 14
TAZZY

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Westfield,MA

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if it was happening before, and you took out the motor to change the clutch, i would have a hard time believing it to be something to do with some sort of connection or something stripping. i wouldn't put your main focus on that and try to focus on something else, maybe you can try diferent fuel, or if someone you fly with has the same size motor, you could try that and then you can really narrow it down from there.

GDay

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02-12-2006 02:11 AM  12 years agoPost 15
Arctic

rrNovice

Louisville, KY

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It could be that the one-way/auto-rotation bearing is slipping. I have not had this happen on my Raptor 50, but it occured numerous times with my Caliber 30. Each time it happened on my Caliber the engine would start screaming, and down the helicopter came. Fixed the problem by cleaning the bearing thoroughly and then lubricating it with ATF(Automatic Transmission Fluid).


Be the change you wish to see in the world. (Gandhi)

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02-12-2006 02:11 AM  12 years agoPost 16
Dr.Phil

rrApprentice

Oslo, Norway

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Just thought of something. I have Revlock.
I actually havent tried without this engaged.
If I am not mistaken there is a failsafe setting on this to.
What if I have problems with the sensor, could this be problem??


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 02:12 AM  12 years agoPost 17
TAZZY

rrVeteran

Westfield,MA

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It could be that the one-way/auto rotation bearing is slipping.
that is a very quick and easy step you could try, i don't think it would take more than 5 minutes.

GDay

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02-12-2006 02:14 AM  12 years agoPost 18
TAZZY

rrVeteran

Westfield,MA

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have you checked the magnets?

GDay

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02-12-2006 02:14 AM  12 years agoPost 19
Dr.Phil

rrApprentice

Oslo, Norway

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Arctic, great tip!
Maybe it is time to lubricate the one way bearing again to.
Even though it isn't such I long time since I did it.
that is a very quick and easy step you could try, i don't think it would take more than 5 minutes.
Tazzy, I can't believe I didnt think about this at the field today.
To frustrated I guess.


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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02-12-2006 02:15 AM  12 years agoPost 20
Dr.Phil

rrApprentice

Oslo, Norway

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Magnets are ok
Wow, this are a quick forum to get help that's for sure


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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