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HelicopterCompass Knight 50 ODIN 90 › Tail problem solved
09-13-2007 12:08 PM  10 years agoPost 1
SP4772

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Mirabel, Québec,​Canada

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Remember guys that i had a little wag in the tail? I had the littles shims missing between the bearings. Well, they are still missing (will have them tomorrow) but i installed the new thrust bearings sent by Compass and the tail wag no more! Even if the shims are not there yet. The new trust are well made. Thanks again Luke!!

WWJD??

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09-13-2007 12:12 PM  10 years agoPost 2
ez2bgman

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N'awlins, LA

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Glad you got that resolved...

Gary
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09-13-2007 12:18 PM  10 years agoPost 3
SP4772

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Mirabel, Québec,​Canada

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Tought i was OK but now i need to find out what is making that metal noise from my engine(or near it). It sounds like a worn bearing but my heli has only 30 flights. I have the OS hyper and the MP5.

WWJD??

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09-13-2007 12:42 PM  10 years agoPost 4
bugsb

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rothwell//northants​UK

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have a look at the OS bearings
many are failing after 30-40 flights approx
i have seen 7 go in 2 years at the club and it starts with a metal /bearing noise
Ron

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09-13-2007 01:00 PM  10 years agoPost 5
ez2bgman

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N'awlins, LA

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I would definitely check the rear bearing on your Hyper. They are notorious for going bad far sooner than they should. Mine have always gone bad after 3-5 gallons through them.

Gary
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09-13-2007 02:26 PM  10 years agoPost 6
SP4772

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Mirabel, Québec,​Canada

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Thanks, i'll check that...is there an upgrade available or i must fix with the same failing bearing?

WWJD??

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09-13-2007 05:48 PM  10 years agoPost 7
ez2bgman

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N'awlins, LA

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Once the rear bearings go out on my engines I replace them with ceramic bearings from http://www.rc-bearings.com (leave the dash in the link). They run about $30 USD plus shipping for a set of front and rear.

Gary
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09-13-2007 06:00 PM  10 years agoPost 8
SP4772

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Mirabel, Québec,​Canada

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Thanks Gary...Will it last for long? I read the procedure to replace and it is a hassle to change.

WWJD??

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09-14-2007 05:11 AM  10 years agoPost 9
ez2bgman

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N'awlins, LA

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I have not had to replace the ceramic bearings once they were installed. It really isn't too hard to change out. Once you pull the engine out and remove the clutch/fan, remove the carb and head. Then pull the sleeve out and then take the piston rod off the crank shaft. Finally pull the crank shaft out. You should be left with just the engine case with bearings installed. Clean it off and then throw the case in the oven at 250* F for about 10 minutes. This allows the case to expand. Remove it and gently tap the back of the case on a black of wood and the rear bearing should just fall out. The front bearing should be able to be easily pushed out from the inside of the engine using a wooden dowel or somethine similar.

Once the bearings are out, I always clean the inside good with some alcohol. To put the new bearings in, throw the engine case back in the oven for about 5-10 minutes. While the engine is baking, slide the new rear bearing on the crankshaft. Grab the engine from the oven and immediately insert the crankshaft,with the rear bearing on it, until the bearing is fully seated. Then slide the front bearing in. They should both be able to pushed in with little force. Do not force them in or you may damage them.

When you reassemble your engine, make sure that you line up the split in the piston ring with the little pin that is in the groove on the piston. The sleeve also has a notch in it that lines up with a pin on the case.

Hope this helps and let us know how it goes.

Gary
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09-15-2007 01:58 AM  10 years agoPost 10
Jon the Rooster

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Johns Island,​Charleston, SC

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ez2bgman
Could you post a link of the exact bearings you used, plezz.

and one more thing "DON'T BE AFRAID!"

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09-16-2007 03:29 AM  10 years agoPost 11
SP4772

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Mirabel, Québec,​Canada

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Good explanations Gary, thank you!...I went to the field today and i installed my spacers in the tail. Guess what? Wag again!!! I will remove them and just fly without it. The new thrust bearings are good but do not need thoses shims i think.

For the bearings now, the noise is louder after each couples of flights. I will order the new bearings and do the recipe Gary explained (process is detailed too at http://www.rc-bearings.com)

The bearings i need: http://www.mcintoshcentral.com/rc-b...a27f47006d929b5

WWJD??

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09-16-2007 04:46 AM  10 years agoPost 12
ez2bgman

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N'awlins, LA

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SP,

Those are the same bearings that I have used in my Hypers and YS91's. I don't know if it makes a difference, but I order it with the stainless steel races as well. Let us know how it goes once you replace the bearings.

Gary
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09-24-2007 03:44 AM  10 years agoPost 13
SP4772

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Mirabel, Québec,​Canada

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I replaced the worn out bearings with Precision Bearings (ceramic). I did it the right way and now my OS run so smoooth. Thanks Gary! The rear bearing was realy sloppy and looked so weak compared to my new ceramics!

WWJD??

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09-24-2007 04:30 AM  10 years agoPost 14
ez2bgman

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N'awlins, LA

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No prob, glad that I could help out. Let us know how she flies now with the new bearings in.

Gary
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09-24-2007 08:20 PM  10 years agoPost 15
SP4772

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Mirabel, Québec,​Canada

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I flew sunday (4 flights) and today (7 flights) and the engine is smooth and now give me the performances i was waiting for! I am gaining more confidence with the knight. When i was just flying my little T-REX, i could not imagine then what i was missing!

I tried today 13 deg of pitch and was surprised that the engine did not bug too much at 2100 rpm. WOOOOUUUAA, It is moving fast guys!

WWJD??

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09-26-2007 04:54 AM  10 years agoPost 16
ez2bgman

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N'awlins, LA

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Good to hear. Watch how much collective and cyclic pitch you are running. I run +/- 12 on the collective and +/- 8 on the cyclics and it has more than enough cyclic speed and "pop".

Gary
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10-20-2007 10:41 PM  10 years agoPost 17
SP4772

rrApprentice

Mirabel, Québec,​Canada

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Just to let you know guys that my bearings on my HYPER gave up after 20 flights!!!!!! My gooooooooood budy at http://WWW.NDHELI.com Nick Di Biase gave me a brand new engine. I sent the other one to be ckecked and how does it cost to me? The shipping only!

Another issue i cleared up, my wag that came back when i changed the engine. I know i know, a rich motor can do that but after 25 flights, i closed the needle a bit and still wagging fast. I lowered my gain on my 611 to 32 instead of 38 and gone is the wag. Tested with inverted backwards and hold well...

What is your gain on your 611 guys?

WWJD??

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10-23-2007 02:59 AM  10 years agoPost 18
SP4772

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Mirabel, Québec,​Canada

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Hello??

WWJD??

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10-23-2007 05:27 PM  10 years agoPost 19
bugsb

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rothwell//northants​UK

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i cant seem to get rid of a slight wag in forward flight
tried 3 different servos upped the gain lowered the gain
now going to try different tail blades
the wag is less on a standard hitec servo
any idea what to look at next
gyro was a 401 now a csm 310 still the same
Ron

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10-24-2007 11:45 PM  10 years agoPost 20
SP4772

rrApprentice

Mirabel, Québec,​Canada

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Thanks for answering Ron!!! I fly Carbontech 92 mm and i also have Radix 95 mm (did not try them yet). I was told that a bigger disc in the back will accentuate the problem (95 mm). Lowering the gain helped a lot but it is not perfect like it should. My Knight flies like a dream except that little thing... At 32 on the GY611, it is almost gone but once in a while there is a very light and slow wag in hover. Holding well when flying though.

Ron, maybe a 611 for your heli?

WWJD??

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HelicopterCompass Knight 50 ODIN 90 › Tail problem solved
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