alfredbmor

I have seen the advertised weight at 21.5 oz (about 1 oz lighter than Saito 115)
I 'd like to know if someone have tested and if the advertised weight is right.

Thanks.

Alfredo

EdwardB

My Feedback: (6)

I bought one this winter. It's mounted right now in a Great Planes quarter scale RV-4 ARF. I'm not going to take the plane apart to weigh it, but I remember weighing when I received it, and the weight was as advertised. Waiting for warmer weather to run for the first time and maiden the RV-4.

alfredbmor

Have you broken-in?
What size of prop did you (are you going to) use?
Thanks.

EdwardB

My Feedback: (6)

I'm starting with an APC 16-8. No, I haven't put a drop of fuel through the engine yet.

alfredbmor

Still cold up there isn't it?
Thanks for the info, I hope you can post some more later when you fly your RV-4 (great performer for what I have heard).

Ken6PPC

I don't have an OS110, so I can't answer your weight question first hand. However, I remembered this post from a while ago, and I found it for you.

http://www.rcuniverse.com/forum/fb.asp?m=8312260

alfredbmor

Ken:
Thanks for the info, it looks that it is a bit more than 2 oz more than the advertised weight and still being the saito 115 the lighter for 1 oz.

mike early

Lighter than a Saito 115?

Hmm. Maybe one included the muffler and one did not?

16x8 prop? I'll be impressed if it can turn it at 8000rpm

asmund

If OS was honest and actually advertised the REAL weight of the new engine it would be their first

Over the years I have learned not to thrust any published weights from OS.

I have said it before, lets chip in on a fine digit scale and giftwrap it and send it as a present to OS, they really need it[sm=lol.gif][sm=lol.gif]

alfredbmor

Os is 1 oz heavier than Saito 115
and yes I would like to have honest info from any manufacturer. When I bought my .82 I could not believe the advertised weight, a lot less than my saito .91 and almost as powerful as the .91 (handles the same 14 x 6 prop)

togatoga

My Feedback: (42)

16x8 seems like a lot of prop for this engine. I've had more success with a 15x7 and 14x8 JM prop or a 15x8 apc. This engine out turns my 110a by a couple of hundred rpms. There's so much talk about lubrication problems, I swear it's never been a problem to me. The key is to inspect the engine after a long layover and always allow the engine to warm up before gunning the throttle.
I like this engine over the 125 primarily as the power difference is not much, it feels very rev happy probably because of the shorter stroke, vibration feels less, has a better torque curve I reckon and the exhaust outlet is thicker so less prone to breakage in a crash.

EdwardB

My Feedback: (6)

togatoga:
I assume your post is in reference to the OS FS 110-a? I know that's the title of the thread, but several other engines have been referenced... I agree 16x8 could be on the high side for the OS FS 110-a. But I'm going to try it with the Great Planes RV-4 because (1) this is in the prop size range recommended by OS for a scale plane, and (2) a Dick Petit review of this exact model (someone who has credibility and my trust) used an APC 16x6 with an OS91 Surpass II, and said it worked perfectly in this application. My final weight is within an ounce or two of his review model. I'll take it slow an easy with several tanks on the ground first, see how it tachs, etc., before committing to first flights. I'll change to a different prop if necessary. I'm planning to fly this plane like a scale model not a pattern or 3D ship. If someone has real world experience though (e.g. actually running this exact engine with this exact size prop) I would be interested.

Wise_Man

Where can one get the torque curve of this engine or other OS engines?

DarZeelon

Quote:

ORIGINAL: EdwardB

I'm starting with an APC 16x8. No, I haven't put a drop of fuel through the engine yet.

Edward,


An APC 15x8 is the benchmark prop size for the YS 1.10...

A larger 16x8, I believe, would grossly overload your significantly less powerful OS1.10-α.


I would recommend a 14x8 for break-in.

mike early

the fellow must be typing about the 115

togatoga

My Feedback: (42)

You're right, my age is showing. Somehow my brain had a mild disconnection with the outside world. I was referring to the 115.
Back to topic! I have run this engine in a calmato 60. Its a very easy handling engine.Starts easily, lower vibration than a 115 and superb idle. I find you need to prop it above 9000rpm to extract the most out of this engine. I find a 14x8 to be a very good prop failing which a 15x6/7. A 16x6 will load it too much and it falls off its ideal band. Even the 125 turns this prop below 9000rpm.
I am getting about 9200 on 8% nitro with a 14x8.

alfredbmor

TogaToga:
Do you own both engines? (Os 110 and Saito 115)
If so could you tell the difference in size if any?
Thanks.

togatoga

My Feedback: (42)

Here are the pics for comparison. The length from thrust washer to carb end are approximately the same. The 110a is slightly taller . Only thing i found while swapping one for the other was the different mounting holes and the carb for the saito is biased to the left so switching the throttle lever from outboard to inboard results in the lever positioned almost center of the engine. This doesn't happen to the 110a as the carb is more central and the throttle lever juts out a fair bit. A nice touch.
The 110a has the recirc oil system which augurs well for lubrication of the rockers, and lower vibration. The 115 has a slight edge over power and is lighter. I like both engines. Somehow, the saito keeps its newness better than the OS, the finish of which darkens as the engine ages. Must be the metal used. Thats why its easier to claim low time on a saito than an OS!!

Wise_Man

I've just had a brand new OS FSa-72 and measured its weight with high precision scale. Here are the advertised (from Tower Hobbies) and measured numbers:

Engine+glow plug+prop washer & nut ==> advertised 16.79 oz, measured 16.72 oz
Muffler + manifold with nuts on it =====> advertised 1.90 oz, measured 1.92 oz
Total ==========================> advertised 18.69 oz, measured 18.64 oz

I've also had a second hand OS FSa-110 recently, and I'm gonna report its weight on Monday if I don't forget to bring it to my office.

Wise_Man

As I promised I've measured the weight of OS FSa-110 today. Here are the advertised (from Tower Hobbies) and measured numbers: Please note that I use advertised-A and advertised-B designations. The former is the weight given in ounces in Tower's and other websites while the latter is the weight given in grams at the same sites. I noticed that when you use the weight numbers given in grams and convert them to oz, they are quite different from values posted directly in oz. Apparently, OS made a ridiculous mistake in converting grams to ounces. As you will notice in the following, the weight values posted in grams are much closer to measured ones.

Engine+glow plug+prop washer & nut ==> advertised-A 19.20 oz, advertised-B 600g = 21.16 oz, measured 21.20 oz
Muffler + manifold with nuts on it =====> advertised-A 2.30 oz, advertised-B 72g = 2.54 oz, measured 2.48 oz
TOTAL ========================> advertised-A 21.50 oz, advertised-B 672g = 23.70 oz, measured 23.68 oz

I am hoping to post RPM and static thrust values of both engines for a wide range of APC props in the near future once I finish the static thrust measurement setup.

weezle

Would you suggest putting a small drop of loc tite on the screw that holds the throttle arm on. this weekend I was breaking the motor in and it came loose. I'm turning 8500 rpm's on the 4th tank with a 14x8 vess prop running 15% nitro

Wise_Man

I don't know if you mean Loctite glue or thread locker. But, I would use a thread locker, preferably the medium strength (blue) one in case you want to remove that screw in the future. My limited experience with the red (full strength) thread locker is that sometimes it gets so strong that you can shear the screw (particularly if the screw is a small sized one) when you want to unscrew it.

Jetdesign

My Feedback: (8)

Red loctite is designed to be removed only by high heat. The blue stuff is meant to be unscrewed.

g_mkoch

Does anyone know what the fuel consumption is for this particular engine?

w8ye

My Feedback: (16)

Any suggested fuel consumption figures quoted should be taken with a grain of salt.
[ul]
Your consumption will vary[*] By your flying style[*] Needle valve settings [*] Prop used
[/ul]

I would set my plane up with a 18oz tank