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HomeAircraftHelicopterHelicopter Main Discussion › Are you sticking with the OS 50 hyper?
06-03-2012 09:39 PM  6 years agoPost 21
rexxigpilot

rrProfessor

Florida

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Just because it has a locator pin doesn't not mean it will take the same exact "set" it did during original break-in.
It absolutely will!
I'm not sure I buy the loss of power with the Magnum sleeve.
If bushings (plain bearing) didn't have more losses, there would be no such thing as a ball bearings. The balls of a bearing (or the rollers of a roller bearing) rotate or roll as the bearing turns. This creates a very free moving condition. A bushing operates by having sleeves revolving relative to each other with a thin film of lubricant (oil in the RC engine case) between them. If it weren't for this lubricant the frictional losses would be tremendous since the coefficient of friction between most metals is very high. The lubricant needs a fairly high viscosity or resistance to flow, otherwise it would not have enough film strength to maintain a lubricating film under load. The result of film breakdown is metal to metal contact, high friction along with associated high heat and subsequent seizure of the bushing. It is the shearing of this lubricating film that causes the higher rolling resistant of a bushing compared to a bearing. Example, move your hand quickly through air, water and oil. Which is harder to move through? Obviously the oil. There are many clutches/couplers that use nothing more than the viscosity of a fluid to turn a shaft without any other contact.

http://auto.howstuffworks.com/differential5.htm

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06-03-2012 11:27 PM  6 years agoPost 22
HotsHabit

rrVeteran

Idaho

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Just because it has a locator pin doesn't not mean it will take the same exact "set" it did during original break-in.
It absolutely will!
Im sure you have noticed that the pins in these motors are single pins with a certain amount of play in them. Not to get into a pissing match with you here, I will simply point out the amount of play in the sleeve pin/groove as well as the amount of play the ring has in its groove. Place your ring on the piston and then slide it into the sleeve without it being hooked to the crankshaft, now rotate the piston back and forth gently and feel how much play there is until the inner ring land contacts the pin in the piston. Combine that with the amount of play in the sleeve groove to the block pin. This is my basis for saying it wont take the same "exact" set that it did during break in.

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06-04-2012 03:24 PM  6 years agoPost 23
rexxigpilot

rrProfessor

Florida

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And so what is different about how it could move slightly before disassembly and after? If you put it back together the same, it will operate exactly the same.

Don't know your experience with small engines, but I have rebuilt 100's of engines during my many years in RC, especially in my pylon racing days. Those engines didn't last long at 30K RPM. We always had to replace parts due to running on the ragged edge of lean, as you need to in racing to win. Holes in piston tops were very common as were notchy bearings.

Often when we replaced the bearings and piston (reused the ring mostly) we would cross-hatch hone the cyclinder wall to remove small scatches and glazing. This let the ring and cylinder reseat for better compression and more power. The honing marks retain a small amount of lubricant. Most of our engines used a Dykes ring too which is designed to expand from the combustion pressure to make a tight seal. These rings moved much more than a standard ring.

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06-04-2012 08:14 PM  6 years agoPost 24
trunkmunki

rrApprentice

Bangor

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Pretty soon the .50 size helicopters will swell to .60 cui, that will be cool to have a helicopter with that kind of displacement.

Oh, wait, we used to have that.

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06-04-2012 09:09 PM  6 years agoPost 25
MANCHA

rrVeteran

Cabo San Lucas, Baja- Mexico

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punkin71
Vibe 50 3D is my favor heli in my Heli Hangar; it is so robust, I always knew it was design with bigger engines in mind.

When I placed a YS56 on it, Vibe50 came alive !

I use it mainly for F3C practice and with a bigger engine it is
just fantastic.
I understand and respect your choice of keeping a Hyper50 on it but
you are missing this heli`s great potencial.

Sport flying with OS55 or YS56 allows you to use 620mm main blades without engine complaining about it!; which
in turns, allows you for better Autorotations and great all around sport flying, it climbs fantastic to say the least !!

I still have one Hyper50 on my old Hirobo EVO50, I had changed 3 rear bearing and two cilinder sets on it and practically, I promised myself not do it again.-
I read, bearings from RL53 are good for and I may changed my mind and try
this solution just once more.

Rear bearing issue on Hyper50 made me moved to YS and TT engines which have no problem with them; as I associated this issue to poor quality/design on OS part and; they did not care, even though we all as a RC heli comunity, demanded an action from OS to fix this issue.

Saludos

MANCHA

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06-04-2012 09:52 PM  6 years agoPost 26
CX1

rrKey Veteran

Canada

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wtf
Anyone else think it funny that thunder tiger fixed the OS bearing problem and OS fixed the RL carb problem

" Team Protoast "

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06-04-2012 10:45 PM  6 years agoPost 27
helidevil

rrElite Veteran

Brunswick, ME

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O.S. 50 Hyper untill i sell this thing makes plenty of power

Watch at YouTube

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06-05-2012 02:49 AM  6 years agoPost 28
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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Nice flight dev :)
I'm more than happy with my hypers. The hyper in this helicopter is about 5 years old. It has about 200+ gallons burnt through it with a few ring changes and a bunch of rear bearings too along the way.
I don't have a problem changing the rear bearing. It takes about 30 minutes. I also get the rear bearings for 3 bucks a piece. Front and rear bearing is 5 and some change. Convenient being only a couple miles from my house.
This engine has provided me with consistent trouble free runtime with plenty of power for my flying style.
Its a no brainer to operate these engines. I wouldn't hesitate to buy another few of them just to have laying around the shop.

Watch at YouTube

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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06-05-2012 03:34 AM  6 years agoPost 29
BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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Yeah the OS 50H is fun but once you fly a OS 55,you won't look back..The OS 55 makes the heli feel like 90 size power in a 50 size heli,well damn close..I'll fly the hell out of either but would so rather have the OS 55 hands down..

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06-05-2012 05:04 AM  6 years agoPost 30
jschenck

rrProfessor

La Vista, NE.

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what's the flight time difference between an OS-50 and 55? For those that don't want or need the "hard 3D" power it might be nice to have an engine that produces plenty of power and uses less fuel. OS-50 with 15% fuel easily flies 12 minutes and can fly a lot longer if you reduce the head speed.

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06-05-2012 08:13 PM  6 years agoPost 31
bart2546

rrVeteran

Canal Winchester, OH - USA

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For me, with it running on the rich side, the OS-55 (non-pumped version) runs for 7 to 8 minutes. And that right now puts it around 200 degree temps at the end of the flight flying in idle up at 1,800 RPM governed on an average temperature day between 75 to 82.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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06-05-2012 09:59 PM  6 years agoPost 32
Dirthead

rrApprentice

Thornton Co.

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Guys I have been running the Magnum bearing for about two years now and have never, yea thats right NEVER had to change it out. As far as the power issue there may be some losses on some engineers paperwork somewhere but in real life it is not noticeable. The bearing is my answer to the changing one out every 30 flights or so. I have one in my 50 and my 90 and will never have to buy a roller bearing again. Thanks Buzz for taking the time and energy to research and test it out and put out a good dependable product for us.

Keep ur head out the dirt only in the grass

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06-05-2012 11:03 PM  6 years agoPost 33
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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I'm getting 11-1/2 minutes per flight on 30% through the hyper50.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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06-06-2012 12:52 AM  6 years agoPost 34
rstekeur

rrApprentice

Ft Myers, FL

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Hey heli-cuzz, do you have any links on how to tune a nitro. About all I know to do is open the needle up about 2 1/2 turns and make sure I can put my finger on the backplate to see if it's getting hot. I just recently got a couple of raptors with hyper 50's. they seem to run ok, but I'm sure I can use some tuning tips

Even a stopped clock is right twice a day

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06-06-2012 01:00 AM  6 years agoPost 35
JasonJ

rrKey Veteran

North Idaho

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Changing a bearing every 30 flights? Good lord, there is something wrong with that. I think my last and only bearing change was in 2010. I also don't lean the living crap out of my needles so who knows. I have never used afterrun or any of that either. I just refill the tank and stick it on a shelf.

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06-06-2012 01:44 AM  6 years agoPost 36
punkin71

rrApprentice

illinois

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Rstekeur, search for, "Tim Jones tuning video" on the other site. It is a very good and free tuning guide nitro newbs. Also Bobby Watts and Bert Kammerer made an excellent Tuning guide in their Smacktalk series. Episode 1, good tuning video and lots of info on different engines. Cost is 3 bucks but worth it.

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06-06-2012 02:24 AM  6 years agoPost 37
BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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With a good tune and 2100RPM headspeed,the O 50 Hyper gets around 8:00-8:30 mins of flight time..
With a good tune and 2100RPM headspeed,the OS 55 gets around 6:30-7:00 mins...

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06-06-2012 03:24 PM  6 years agoPost 38
Eleven_Bravo

rrVeteran

Salisbury,NC

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30 flights till failure sounds about right to me no matter what I tried.

I have two hypers and a 55 the magnum glide bearing is going in all three im happy that I can fly my 50s again. I think its a tiny bit much $$ but its way cheaper than the engine parts after a bearing shreds the engine eternals. I just wish that I didnt stop looking for a cure to the problem I could have been flying my 50s sooner.

ENGAGE!!

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HomeAircraftHelicopterHelicopter Main Discussion › Are you sticking with the OS 50 hyper?
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