rcdude7

My Feedback: (264)

I have a new .30 surpass, I have searched this forum and not turned up much info on it. I have read opinions on other boards that the previous model, the .26 is a better running engine.

Are there any .30 surpass owners here who would like to give opinions on this model? Are you happy with it?

Thanks, Mike

jaka

Hi!
.26 a better engine ????
No way!!!
The .30 is just as good as any other OS engine!

w8ye

My Feedback: (16)

I had a 26 for several years. It was a good engine.

Due to the parts commonality between the 26 and 30, the 30 couldn't help but be an improvement over the 26.

rcdude7

My Feedback: (264)

That's what I would assume, the cam and head are the same part#. Other than displacement, the rest of the engine is pretty much the same as the .26 surp.
I do see that the exhaust is not the same as the .26, and the .30 muffler outlet is very small, even for a .30 size engine..........

Hobbsy

My Feedback: (102)

Dude, having two Saito .30s and judging by my OS .52 your .30 will thrive on a Graupner 10.5x5, a 10x5 will be a little light. It should be a schweet engine. The Saito .30 is a perfect engine for a Sig LT 25 like plane so will your engine be.

rcdude7

My Feedback: (264)

Thanks hobbsy. Graupner props are a little hard to come by at the LHS, I do have a apc 10.5X4.5 that should be fairly close to the same load as your prefered prop.

From what I understand the saito is somewhat more powerful than the OS engine. If the saito .30 were still available, I would have tried one of those instead.

w8ye

My Feedback: (16)

I have three Saito 30's and sold my Magnum 30 and OS 26 as a result.

turboratt

got a 30 runs great even have an old 20 that im running in a little tigermoth no prob at all

Hobbsy

My Feedback: (102)

Dude, just order one or two from lobby-lobby.com, they are fast on the shipping.

http://www.hobby-lobby.com/grprop.htm

gamellir

My Feedback: (42)

I am running an OS FS30 in a Great Planes Sporter EP that I converted to glow. It has very good power, is very quiet, easy starting and idles great.
It is a very nice running engine

scott17

I have a couple and they run great! I use an APC 10-4 and 15% Omega fuel. Sweet runner!

jaka

Hi!
10x4 is way to small for the any .30 fourstroke if you fly at sea-level. 10x6 or 10,5x4.5 APC are good props to use.

scott17

I guess you haven't flown my plane. Try it and see, you may be surprised!

jaka

Hi!
Well, with a 10x4 prop your engine will rew too much.
Aim for an rpm around 9000-10000. Not more.

MrMulligan

My Feedback: (314)

I had one in a Modeltech Cub .25. It was an inverted installation and started right up each time I flew it. One of the easiest handling four strokes I've ever owned. Surprisingly fast.

Bone

I ran mine yesterday on the test bench, it's now basically run in. I used a MA 10 x 4 as I wanted a light load on moderate RPM. Really is a lovely sweet engine.

Do have one concern though - after running 2 x 6oz tanks of fuel containing 20% oil (15% synthetic & 5% castor) through it, I removed the backplate to check how well lubricated the bottom end/crankcase is. I was rather concerned to find it was practically bone dry in that department. And when I pulled off the cam cover plate, even drier [X(]

By comparison, my Saito 45 always has ample oil in both of those areas.

I wonder why the OS had so very little oil in the crankcase? This may sound sorta weird, but is it possible that the ring is sealing "too well" & not allowing enough blowby gases & oil to pass through to the sump area?

scott17

Rev too much for who? The same basic engine is used in cars at about 19000 RPM. I learned a while back that 30s like to rev a bit. Try it and see!

Hobbsy

My Feedback: (102)

Displacement: 4.89cc (.299 cu in)
Bore: 19.5mm (.767") Stroke: 16.4mm (.648")
Power Output: .5 HP at 10,000 RPM
Weight with muffler: 10.4oz (295g)
Weight without muffler: 9.8oz (278g)
Practical RPM Range: 2,500 - 13,000 RPM


Here is the straight skinny from the OS site. I wouldn't run it over 10,000, the 10x4 is too light.

NM2K

My Feedback: (14)

The 10x4 Graupner runs perfectly on my OS FS-20.

Car enthusiasts are used to much shorter engine lifetimes than we airplane folks. If wearing out the engine sooner is okay, then the 10x4 is good for the .30. I tend to let my four-strokes rev up a bit anyway. So far, no swallowed valves, etc., but I don't go crazy with the practice. Just a little bit. 8>)


Ed Cregger

Sport_Pilot

The manual says 13,000. The crank and rod seem ample enough for much more. If the valves don't float it's OK. I doubt that the 10-4 will allow it to reve past 13,000 its only 1" less pitch than a 10x5 which lets it run about 10,000.

Sport_Pilot

Lately it wouln't matter if my engines lasted less than a car engine. I haven't flown in about 9 months.

Milcent

I flew my "Baron" with a FS30 since 2 weeks now. I have 10 tanks flights. I broke twice the exhaust valve spring, one with a 9x6 propeller after 4 tanks during the break in and the second after 4 flights with a 10x4 propeller.
I have a friend who had the same problem.

I use Power Master 10% fuel, the same for Saito 72 and 56 4 Stroke with no problem.

I wonder if any of you ever hear about this problem : i believe it is a problem with the spring itself that doesn't support well the heat in the engine ???

Thanks for your advices.

Pierre.

kersplat

This engine is not the same engine used in cars, the car version has heavier valve springs to prevent valve float. I believe the cam profile is different too.

w8ye

My Feedback: (16)

You are running your engine too fast with too small propeller. You need a 10-6 propeller
Set the valve clearance .04 mm to .1 mm

rcdude7

My Feedback: (264)

Pierre, those are the same prop sizes that I would use in a .25 two-stroke. I think you are over revving your engine.

Mike