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HelicopterOutrage 50-90-Nitro › looking for help on a velocity 50
06-04-2010 02:41 AM  7 years agoPost 1
Hotstart

Senior Heliman

Melville L.I.

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well its been weeks now and the noise still there. weve changed blades gears shafts cluth bell start shaft reciever gov when u take machine off gov. sound and motor pulsing goes away also changed trottle servo twice.its electronic cant find it very frstrating also changed pipe and carb only thing left is motor shame frustration is going to cause me to sell it.

Stop worrying about it just fly . Team Lynx ( the best products )// Mostro/goblin 700 & 570

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06-04-2010 04:26 AM  7 years agoPost 2
Gearhead

rrMaster

Vt

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Charles, consider this a bump, cause I don't know the Heli well at all, I never worked on one,,
but because you said you changed so many things I was going to say it may be a Bearing, but then you say the Sound stops when you turn the Governor off, the Governor is constantly working the Throttle up and down, I'm wondering if this sound is coming from the Oneway Bearing, what does this Sound sound like ??

to add, I had a Chirping sound once on my Raven, it sounded just like a fullsize Bell 47 chrip, I could never find where it came from, after a crash I found it was a Bearing slipping on a Shaft..

what does this Sound sound like ??

Jim
Buzz Buzz Buzz

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06-04-2010 12:40 PM  7 years agoPost 3
Hotstart

Senior Heliman

Melville L.I.

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Sound

Changed one way twice but thank u for your time

Stop worrying about it just fly . Team Lynx ( the best products )// Mostro/goblin 700 & 570

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06-04-2010 12:55 PM  7 years agoPost 4
z11355

rrMaster

New England

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possibly other areas to check are the oneway built into the clutch and the alignment of the starter shaft/bearings. Ditto tail takeoff gear assembly & torque tube bearings.

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06-04-2010 02:20 PM  7 years agoPost 5
Hotstart

Senior Heliman

Melville L.I.

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thanks

done that also but again thanks The store pro at elwood hs tom heffel has taken this on as a personel mission He swapped out motore last nite So the machine is being tested tonite again Again thank u for your input

Stop worrying about it just fly . Team Lynx ( the best products )// Mostro/goblin 700 & 570

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06-04-2010 03:07 PM  7 years agoPost 6
nitroburner

Senior Heliman

pikeville ky. us

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charlesR Try this, Well frist let me ask you this is the trottle servos you have tryed have metal gears? If so try a servo with plastic gears I ran into a problem much like yours on one of my helis and going with plastic geared servo did the trick. Hope this helps.

OMG how much did i spend................

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06-04-2010 03:21 PM  7 years agoPost 7
stang281472

Senior Heliman

Commack, NY

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Nitro
This is Tom. We have tried 3 different throttle servos as well having both metal and plastic gears. The OS 55 that he has in the machine runs terribly rich even with needle setting closed WAY more than they should be and we have tried 2 different pipes one of which is mine that worked perfectly on my 55 and still same. Have tried another carb also and same problem. All his electronics came out of another of his helis and worked fine in other heli. The only things that are new to this picture are the motor and airframe. I truly believe its something with the motor as it needs to be leaned out on the needles way too much to even start to run decent. Off the gov heli flies fine. Turn on gov (which we have tried 3 different ones and 4 different sensors and in a hover throtttle servo starts oscillating which is whats causing the sound. My thinking is being the motor doesnt respond the way it should gov is fighting to maintain headspeed. We will see tonight when we try it with a known good motor. Will post back what we find.

Tom

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06-04-2010 03:25 PM  7 years agoPost 8
z11355

rrMaster

New England

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in my experience, gov's really want the engine leaner than humans would make them.

since the owner is having exactly those type of problems w/ the engine, the overall leanness problem w/ the engine should be worked first until it's resolved. Have you checked the head/shim/gasket seal or backplate seal?

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06-04-2010 03:29 PM  7 years agoPost 9
Shawn Behrens

Senior Heliman

DEEP IN THE BOG

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Motor pulsing often sign of needles being way off. The 55 IMO is much more finicky than the old 50. Where are your hi and low needles?
Shawn

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06-04-2010 03:47 PM  7 years agoPost 10
z11355

rrMaster

New England

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the HS guy indicated that hey tried a 2nd carb so it's less likely that just needle settings are the culprit.

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06-04-2010 04:25 PM  7 years agoPost 11
stang281472

Senior Heliman

Commack, NY

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Thanks for the responses. I know the 55 is more sensitive to correct needle adjustments. I own one and know it tunes differently than a hyper. As Charles will tell you I am quite well known for my tuning of engines. On his 55 the needle settings have o be turned in to 1/2 turn from closed to actually not leave puddles of fuel coming from exhaust on spool up!!! And that's with 2 different carbs. Usually if u have a bad seal in motor it goes lean, this one for whatever reason almost can't be leaned out enough. Thought he had a bad pipe that migh have been putting too much pressure into the tank but pipe from my machine did same thing and it worked perfect on mine. Even if tank wasn't holding pressure you would have a lean scenario. This is why we decided to swap motor with a known good one and see what happens. Almost wondering if something is machined wrong in his motor throwing timing off or something.

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06-04-2010 04:46 PM  7 years agoPost 12
z11355

rrMaster

New England

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ring not sealing?

seems like the next thing to do would try different p/l/r

after that, there's not much left of the original engine

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06-04-2010 05:00 PM  7 years agoPost 13
stang281472

Senior Heliman

Commack, NY

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Exactly!!!! Lmao that's why I decided to swap engine to a known good one. This 55 was brought brand new and from day hasn't been right. Since if it is motor it will be a warranty issue I am not looking to change the liner, ring etc. Motor was purchased new for this Heli and Heli was bought off a friend of ours and flew fine before this so it's not an airframe issue and h had a 55 in it also. Will post back later tonight after we try it out. Will be trying it around 6pm after work.

Tom

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06-04-2010 05:30 PM  7 years agoPost 14
VooDooX

Elite Veteran

San Francisco Bay Area CA, US (San Mateo)

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are the bearings locktighted to the main shaft AND the bearing block?? may be bearings slipping screech?

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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06-04-2010 05:45 PM  7 years agoPost 15
stang281472

Senior Heliman

Commack, NY

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Thought about possble noise issue affecting servo bit again only happens while gov is on. And Charles did put a noise isolator magnet on and made no difference. Truly believe it's motor and will see for sure later tonight

Tom

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06-04-2010 11:02 PM  7 years agoPost 16
Shawn Behrens

Senior Heliman

DEEP IN THE BOG

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Where is the mid needle setting?

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06-04-2010 11:47 PM  7 years agoPost 17
VooDooX

Elite Veteran

San Francisco Bay Area CA, US (San Mateo)

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have you run the motor at gov speeds without gov on? like high rpm?

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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06-05-2010 04:17 AM  7 years agoPost 18
stang281472

Senior Heliman

Commack, NY

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OK tried it with the other motor charles had and initially it appeared problem was gone but noticed right away on start up the rear bearing was making noise (motor had sat for a long time). Bearing started getting louder and the throttle oscillation returned but not nearly as bad as with other motor. Now it would only show up on a decent after a climbout. In hover and during climbout all was good, then while bringing it back down it would start problem and then would settle down when back in hover. He is going to replace rear bearing and we will try it again. The motor we tried today was a regular hyper 50. There was a marked improvement in the issue as before it would start happening even during spool up and was present constantly in a hover.

Sbmon
on OS 55 we had to turn main and mid needle in to practically half turn out because it would be so rich it could barely spool up otherwise which is completely wrong for that motor.

VooDooX
Yes we have and it doesnt make the noise at all. As soon as gov (rev limiter) is turned on, problem is there. And it doesnt matter how low or high you set rpm on gov it still does it.

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06-05-2010 08:43 AM  7 years agoPost 19
VooDooX

Elite Veteran

San Francisco Bay Area CA, US (San Mateo)

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man thats weird...
on OS 55 we had to turn main and mid needle in to practically half turn out because it would be so rich it could barely spool up otherwise which is completely wrong for that motor.
did you blunt the needles by tightening them too tight? when you take them out is there a point or a blunt end if its blunt sand it to a point again just hold the sand paper on the end and spin it but make sure from somone who has that motor that the ends are supposed to be pointed on most motors they are but ive never seen the OS55

also is there gain setting on your gov? if so try changing it

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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06-05-2010 03:10 PM  7 years agoPost 20
stang281472

Senior Heliman

Commack, NY

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Voodoox
thanks for the reply. Needles were not tightened down too much and we actually did pull them out to check for debris (although that would usual cause lean condition) and they were pointy like they should be and we have also tried another carb from a hyper on the 55 since it fits and we had one laying around and even on that carb the we had to close needle to almost 1/2 turn out to not leave a puddle of fuel on ground during spool up. Never seen anything like this. And the gov gain is not adjustable. He is using a 7100R reciever and we also tried align gov and same problem.

Tom

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