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HelicopterMain Discussion › OS50 observations for the Beginner/Newby
12-16-2003 03:54 PM  13 years agoPost 1
joey.furr

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Little Rock, AR

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I have an OS 50 coming this week for my Raptor 50.
I started with a Thunder Tiger (TT) 50, but from my plank flying days I just am used to (and have a little brand loyalty) to OS engines.

Now, on this forum you will find those that say "OS is better, go OS".

Keep this in mind:

All I have to do when my engine arrives to have it up and running in my Raptor is:

1. Take the engine apart entirely, carb, crank, piston, etc..
2. Take apart the carb barrel and precisely grind the low-end area of the cat-eye dosifier according to specs provided by Augusto.
3. Take apart the crankshaft and precisely grind the factory 'webbing' from the crank, according to specs provided most clearly by RickC.
4. Re-assemble the engine.
5. Install into the heli.

If you either aren't comfortable doing these kind of modifications, or are just a "don't want to mess with it" kind of person, you might keep this in consideration when choosing an engine.

Myself...I love tinkering with this stuff which is one of the reasons I like Heli's - yes, you work on them a lot, but it is fun to me.

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12-16-2003 04:01 PM  13 years agoPost 2
Doug

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Port Saint Luice Florida....

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Or, just leave it alone and run rich enough so that the mid range "leanies" don't bother you, (just be aware if you are going to use 30% you may want to leave it(the carb) alone). As for the crank it is a must

First member of Member of Bearings Anonymous

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12-16-2003 05:21 PM  13 years agoPost 3
pchuckie

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Pemberton TWP, NJ

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I prefer the run what ya brung straight out of the box. When I hear about the crank mod, I hear it makes the crank more balanced. But the part I'm wondering is if they say the balance is better on the crank only, and not the whole assembly of the crank, piston, and conrod. How could one even check the balance of all the parts together?

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12-16-2003 05:23 PM  13 years agoPost 4
Doug

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Port Saint Luice Florida....

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The best that you can hope for in a single cylinder engine is for it to shake "evenly". The change in the crank makes it shake more evenly

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12-16-2003 06:14 PM  13 years agoPost 5
SteveH

rrProfessor

Texas

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I certainly don't want to argue with anyone about this, just want to state what happened. When I took the webbing out of my OS 50, it vibrated terribly. It was so bad it was going to shake my heli apart.

I then took it apart, ground a small amount of material ( a wild a$$ guess on how much to take off) of the counterballance of the crank, the heavy side accross from the crank pin, and I got lucky. It is now very smooth again, just like before I took the webbing out.

The government cannot give you anything without first taking it from someone else.

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HelicopterMain Discussion › OS50 observations for the Beginner/Newby
12-16-2003 06:42 PM  13 years ago •• Post 6 ••
Doug

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Port Saint Luice Florida....

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SteveH:

Just curious, what heli? My only experience has been with the Raptor 50 the mount of which has a lot of lateral "softness". The crank mod seemed to "de-tune" the resonant point which made it a lot smoother

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12-16-2003 06:51 PM  13 years agoPost 7
rckrzy1

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Hurst Texas

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Just fuel it up and run it till the bearing fall apart in 2-5 gallons, and hope
it don't eat up the cyclinder wall and piston when it does.



Wildcat Fuels

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12-16-2003 06:52 PM  13 years agoPost 8
joey.furr

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Little Rock, AR

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rckrzy1

Gee, that sounds like a good idea.

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12-16-2003 09:02 PM  13 years agoPost 9
SteveH

rrProfessor

Texas

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Doug,

The OS 50 is in a Century Falcon SE V2, the engine is about two years old, but I don't know how much fuel has been run in it as I bought two at the same time for two Falcons. I have not had any bearing trouble, just was trying to improve it after reading all the posts. The Falcon has a fairly rigid mount in a fairly rigid aluminum lower frame set.

The government cannot give you anything without first taking it from someone else.

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12-16-2003 09:08 PM  13 years agoPost 10
Doug

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Port Saint Luice Florida....

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I think that makes a huge difference (IMHO)

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12-16-2003 10:27 PM  13 years agoPost 11
pchuckie

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Pemberton TWP, NJ

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This is the very thing that makes me skeptical of the mod's effectiveness.

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12-16-2003 10:29 PM  13 years agoPost 12
shawgl

rrKey Veteran

Murrieta, CA

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Carb mod

Notice in Augusta's post that it states the mod is only needed IF you have the leaning problems in YOUR engine. Mine doesn't so it's staying the way it is. I also have had no bearing problems yet. Hope it works for you either way you go.

In God we trust, everyone else we monitor.

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12-17-2003 02:28 AM  13 years agoPost 13
MJWS

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Airdrie, AB - Canada

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Try It Stock.

I picked up an OS50 earlier this year. I've put at least 20 Gallons of CP 15% through it flawlessly. There are lots of people with great results on the stock motor.

That said I'd try Augusto's mod in a second if I could get a bunch more power on the top end and still run cooler midrange. I'm lovin this motor over all and can't wait to see it haul on 30% with a good pipe. Perhaps then it'll be time to get out the file.

Mike

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12-17-2003 04:12 AM  13 years agoPost 14
hercules

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Pittsburgh, Pennsylvania - USA

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Break it in stock first! Don't jump to conclusions untill you see and hear it run after breaking it in. This is coming from a guy who did the crank mod but not the cats-eye in the carb. The crank mod smoothed mine out and I must be lucky with my carb tuning because she runs great!

Good luck!

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12-17-2003 04:36 AM  13 years agoPost 15
rcmike

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Dickson, TN

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Or you can just get the airplane version. Seriously though, I had a 50 SX-H that I never could get to run right. It was always leaning out until the piston and ring got scored up. I had a 50 SX laying around that I wasn't using. I put the carb and backplate from the heli engine on the plane engine and the thing has been running great for the last couple of years and has gobs of power. I don't know if it is the unwebbed crankshaft or if there are other differences but it works great.

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