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HelicopterMain Discussion › How long it last ?
11-06-2013 11:22 PM  4 years agoPost 1
Vaderluck

rrApprentice

Melbourne - Australia

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I am talking about a nitro engine here. How long it last before it needs a major overall like piston ring/cylinder sleeve or beraing replacement ?
I heard it is a big hassle to replace main bearing.

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11-06-2013 11:29 PM  4 years agoPost 2
kc8qpu

rrElite Veteran

sc

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Well first off it really isn't that big of a deal. And for those that have told you that have never changed one out or have no clue.

As far as how long it lasts depends on how you run your engine. If you run it on the ragged edge of lean then expect to replace all that stuff once a year if not more.

If you run it on the richer side you can go years with out replacing stuff.

But with the new fuel mixtures you can get now a days they have made nitro engines last much much longer.

Carpe Diem!!!

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11-06-2013 11:34 PM  4 years agoPost 3
wrongler

rrProfessor

Brewerton, New York

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A dusty environment will also wear the engine quicker!

Bill Whittaker

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11-06-2013 11:41 PM  4 years agoPost 4
McKrackin

rrProfessor

Lucasville,Ohio

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Watch at YouTube

I literally never use the word literally right.

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11-07-2013 01:12 AM  4 years agoPost 5
bmapope

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TN

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I have an OS 91 Hz that this December will be 5 years old and never been apart. Probably could use some new bearings.

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11-07-2013 03:05 AM  4 years agoPost 6
Einzelganger

rrKey Veteran

Campbell, Texas

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Clean high quality fuel + clean intake air + slightly rich mixture = years.

Dirt in intake air or excessively lean mixture can limit that to one flight or less.

Liner, piston, and ring replacement is easy. Bearing replacement is simple. Very seldom will you need all at once.

Nitro is awesome.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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11-07-2013 03:50 AM  4 years agoPost 7
turboomni

rrProfessor

East of the Equator

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A well tuned gasser will outlast any nitro motor by a very good margin.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-07-2013 11:14 AM  4 years agoPost 8
Richardmid1

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Leeds, England

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Bearings in 50's particularly the rear bearing can last from 3 gallons to 10 gallons depending how hard you fly, how rich you run the engine and your engine stopping and heli storage technique.

My OS55 is 4.5 years old and is still going but could do with a new ring but the liner, conrod etc. are fine. 90-120's should last a bit longer.

So if I had to hazard a guess ide say every 5-6 years (obviously if your doing a couple of gallons every weekend it won't last as long!) for a major strip down and parts replacement like, piston, ring, liner if its scored and conrod.

60% of the time, it works every time!

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11-07-2013 03:36 PM  4 years agoPost 9
turboomni

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East of the Equator

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I remember my Raptor 50 with the OS Hyper 50 would typically need a rear bearing almost one a season with lots of flights. Don't know specifically how many hours or flights. 3 to 10 gallons is in the ballpark.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-07-2013 03:52 PM  4 years agoPost 10
RAK402

rrElite Veteran

Alhambra, CA

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As long as the engines are run on the rich side, and are not run dry at the end of a flying session, they will last for many flights.

I have three O.S. 50 Hypers and two O.S. .91's. The bearings in the motors are still fine, even thought the oldest is about 7 years old and has many flights on it.

I have been running O.S. engines for almost 40 years now, and have never understood the posts about having to frequently replace the rear bearing in the Hyper .50-they last indefinitely.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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11-07-2013 04:13 PM  4 years agoPost 11
turboomni

rrProfessor

East of the Equator

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Many I know that ran a Hyper 50 had this issue. Examining the bearing always showed the race at the bottom of the stroke ,from 4:00 oclock to 7:30 was badly pitted .not rust as it was pounded to death. I ran 30% always with lots of smoke and within temp.. 15% may not do this ,,I don't know. Maybe it boils down to how hard you run it. I have run OS engines since the 1980's and never had a problem until the Hyper 50 . But since getting out of nitro and run gas my oldest gas engine is 8 years old and has never been open.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-07-2013 04:38 PM  4 years agoPost 12
jason46

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MI

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and your engine stopping and heli storage technique
Richardmid1, I'm curious about this, what is the best technique for stopping the engine?

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11-07-2013 04:40 PM  4 years agoPost 13
RAK402

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Alhambra, CA

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"Maybe it boils down to how hard you run it."

I think this is pretty much the case, sir.

Running it dry can kill the rear bearing, too.

I have a friend who ran his dry, religiously and had to change bearings. When he stopped doing this (and went to just shutting it down with the carb) he stopped having to change bearings.

I don't know if he also changed his mixture, though.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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11-07-2013 04:46 PM  4 years agoPost 14
turboomni

rrProfessor

East of the Equator

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Hey RAK402 I see you own a GMP Cricket as I do. My Cricket has the original OS Max engine and bearings and runs fine. Not bad for 28+ years old. Now if I can just find that elusive Heloball muffler for it she would be complete!!!

Setup is everything, All my heli's can fly far better than I can pilot them

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11-07-2013 04:46 PM  4 years agoPost 15
BENTDABOOM

rrKey Veteran

west seattle

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forgot to mention when rebuilding spray all the parts off with brake cleaner to get all the grud/grease off

CAUTION!!! politicians may be hazerdous to your well being

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11-07-2013 06:30 PM  4 years agoPost 16
RAK402

rrElite Veteran

Alhambra, CA

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turboomni,

A friend of mine has the Cricket right now and is going through it for me.

It does have the Heloball on it (I got it straight from MAC's mufflers a few years ago).

Also has a brand new O.S. .28FSR-H on it, from Ebay. I ran the engine on the bench with a propeller to break it in a little and get the mixture close enough for easy starting.

I have not flown a Cricket in close to three decades, so I am looking forward to this very much. I did cheat-my friend is installing a gyro for me.

The Heloball's show up on Ebay fairly frequently.

I picked on up for an O.S. .40 FSR-H for a Revolution I a couple of months ago.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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11-07-2013 07:11 PM  4 years agoPost 17
turboomni

rrProfessor

East of the Equator

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Interesting,,,my OS was frozen when I bought the heli at a second hand store. I thought it crashed cause the boom was bent LOL!! I soaked the engine in trans fluid and heated it in an oven to get it unstuck. It was old Castor oil goo not rust. Cleaned it up and tried to start it in the Cricket and no go. My hobbyshop guru sold alot of these in their day and suggested what you did. Put it on a engine stand with a prop and get everything right. I put in an old 401 to cheat too.
I flew it last year and what a blast . Very different. There is a guy on here that has lots of Cricket parts including canopies too if you need anything. His name is Gorehambirds I believe.
Sorry to go off topic. Good luck with your Cricket!!

Setup is everything, All my heli's can fly far better than I can pilot them

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11-07-2013 07:17 PM  4 years agoPost 18
RAK402

rrElite Veteran

Alhambra, CA

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I will start a thread in the antiques forum when the Cricket flies.

I have learned a lot about getting old, frozen engines freed up from our U-Control brethren.

I have pulled the heads and heated the sleeve carefully with a torch-that usually gets things unstuck.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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11-07-2013 09:22 PM  4 years agoPost 19
Vaderluck

rrApprentice

Melbourne - Australia

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Thanks McKrackin for linking video.
Replacing parts is not as bad as I thought.

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11-07-2013 09:45 PM  4 years agoPost 20
Manny1776

rrVeteran

Melbourne, Florida. USA

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Clean high quality fuel + clean intake air + slightly rich mixture = years.
+1

Fly High, Fly Fun, Fly Secure.........Fly 3D!!!! Bavarian Demon USA Team

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