boimamao

Hello all,

I'm accually flying a "something extra" from SIG with a Super Tigre .51 Prop is a 11X6. I use to fly it with an OS .46 with the same prop but I didn't feel any difference when I bought this Super Tigre .51. Now I'm thinking about buying an OS .51 to increase the power but some people told me it is going to be the same. Since this OS .50 is very expesive compared to the others I would like to know your oppinion about which would be the most powerfull engine on this size.

Tks
Boi

boatman1069

hi...you dont say what you want to do with the plane...do you want torq for larger props for prop hanging or do you want a high reving speed demon....personaly i like the irvine 53...real good power and reliable too...if you want real speed then iether the jeti 50 or weston 50 will be your bet...have a look (search) at the magnum with a weston eurotech 50v1 and youll see what i mean...i have an os50sx and i still prefer the irvine. the os just sounds noisey compaired to the irvine not quit so sweet.

if you give us a little more info we maybe able to help you a little more..

best of luck with your engine hunting..

boimamao

Hi Boat Man,

This Something Extra ia a fun fly, since I'm not that much old on this hobby I would say torq is what I'm looking for since I want to start learn acrobatics

tks!

asmund

then what you really need is a fourstroke. I have the sc(magnum) 91fs. Cheap, powerful and reliable. Go get one Forget about the 65, 70 and 80 as they weigh almost exactly the same as the 91

Gringo Flyer

My Feedback: (18)

I dont think you will be happy dropping big bucks on an OS51 if you alrady have the ST I dont think you will see much of a change.

Personally I think for SE you have all the power you need with what you are already running. If you want more torque try running a 12X4 or 12.25X3.75 prop.

I agree with asmund. Probably the next big step up in torque would be a 91 4 stroke.

I have a magnum 91 one a 40 sized 3D plane and it is awesome but the SE is not really a full blown 3D ship. So I dont think putting a 91 on it is really the answer either. I would fly it how it is!

asmund

Good advice there My favourite prop for great pull on 40-50 engines is the 12-4 apc as it reacts quicker to trottle input and pulls harder than the 12.25-3.75. When flying my harrier 46 on an mvvs 49 and swiching from that 12.25 to 12-4 apc the pullout from hover improved a lot

Flyer95

My Feedback: (1)

You shouldnt need to buy a new engine but only a new exhaust system for your OS or ST. A cheap and good solution is the minipipe made by MVVS. Jett muffler, ultrathrust muffler, weston UK all these great manufacturers make exhaust systems for twostrokes.

wildchild45177

My Feedback: (11)

Change the prop. If it's speed you're after try a 10X7 or 10X8. If it's power you're after try a 12X4 or 12X5. A 12X4 APC is probably your best bet.

Bob

Red B.

The SSE is one of my all time favorite sport aircraft. It is very versatile and has a surprisingly large speed envelope considering its thick wing. I always keep one in my car just in case a flying opportunity should arise.

The ST 51 has enough power to perform classic aerobatics (loops, rolls, Immelman turns, Cuban Eights etcetera) and most 3D maneuvers, unless your SSE is particularly heavy. No need to purchase a new engine.

For classic aerobatics you need a fair amount of speed in order to make the SSE perform. Using an old OS 46SF engine my favorite propeller for this kind of flight is the APC 11.5x6. Because it is a C/L propeller it can be hard to find and also rather expensive. APC 11x6 or 11x7 propellers are good enough substitutes.

For 3D flight, but almost nothing else the, APC 12.25 x 3.75 is the best choice with 12x4 as a good, or possibly better, substitute. My SSE will hover with some thrust margin using both of these props.

/Red B.

Gringo Flyer

My Feedback: (18)

Another exhaust system would give you more power but if you are just learning acrobatics you have plenty of power.

Truth be told if you are still pretty new to flying I would try to learn basic aerobatics on my trainer. I think lots of folks move on too fast. I wouldnt move on to another plane like a SE until I had mastered touch and gos, cuban eights, immelmans, rolls, basic stall turns and even inverted flight on my trainer. (I speak from personal experience, I moved past my trainer to soon and stuffed my second plane in the first few flights)

All in all in dont think more power is what you need right now. You just need more stick time.

downunder

For the ST G51 you could always just get the CL stunt liner that's ported for higher torque at lower revs.
http://www2.towerhobbies.com/cgi-bin...I=SUPG0829&P=X

boimamao

Dear All,

I'm not that begginer on aerobatics, Acctually What I'm trying to learn is "torq roll". I can not use a 4 stoke due to the weight. Model is very light weight. I jut bought a 12X4 and let's see how it works. Does anybody knows where i can found on the web a new exhaust systems fot ST51?

DarZeelon

Mauricio,


Why don't you call Rodrigo from [link=http://www.extreme-aero.com.br/motores.htm]the club[/link] and ask about the MVVS .49?

Razor-RCU

My Feedback: (50)

A Jett-50 or West-50 will tear the wings off the SE - The best all around performers are the Irvine-53 and Webra-50GT. The OS-50SX is great also... I really like the K&B-48 also

12x4, 11x5, 12.25x 3.75 APC are what I would use...

fredscz

My Feedback: (47)

If weight is what is keeping you from four strokes then you need to check the weight of your ST 51 against a Saito 72 or 82. Don't go by published figures but weigh a ST 51 with the factory muffler and you will find it heavier than either Saito.
Fred

prgonzalez

Boi,

You haven't said what fuel you are using. For instance, I have an OS-46FX with a GP Dazzler which is very similar in size but a little heavier than the SSE (my perception). When I use 10% nitro with an APC 12x4, I get 10,200 RPM. When I use 15% nitro, I get over 12,500 RPM. In the air, I can see the difference in vertical pull. Also, I alternate between APC 12x4 and 11x5. One for more torque while the other for more speed. The snag is the working on the trim everytime I switch props.

I built the Dazzler for improving my aerobatic skills. Less fear for crashing using a cheap airplane. So far, it is paying off. After over 100 flights, my skills have improve a lot. In every flight, I focus on an specific skill, i.e. inverted flight, snap rolls, loops, etc. From time to time, I variate the angle of flying between toward me, away from me, and above me. The one I will never try is below me .

One important thing, after you are okay with engine/prop combo, is balance and trim your airplane. It is a big difference when you have a well trimmed and balance airplane. In my club, pilots with SSE, have told me that they like the way my dazzler fly. But, the plane is one factor, the other is the pilot. It took me about 40 flight to get the airplane to the balance/trim point that I was very happy with.

I encourage you to be patient and think about what you have and what you want to accomplish out of the SSE. Then start working on one step at the time: engine, prop, fuel 10% vs 15%, balance, and trim.

My 2 cents.

Pedro

DarZeelon

Pedro,


Even with the meager OS.46FX, such a difference is unthinkably large, for an additional 5% nitro.

The MVVS .49, will spin the 12.25x3.37W at 13,100 RPM on 5% nitro; and at 13,200 RPM with the shimed up head for the higher nitro, with 15% nitro fuel.

Yes, this is the whole difference, 100 RPM!


I have run the OS FX on 5% nitro and it spun an 11x6 MA prop around 12,200 RPM.

I don't know why your FX is so 'out of sync' on that 10% nitro fuel, but it obviously cannot make 84% more HP on just 5% more nitro...
This is the actual HP output difference between 12,500 and 10,200 RPM, on the same prop.

prgonzalez

Hi Dar,

Yes, I was surprised with the tach readings. Maybe I have an old (storage) can of 10% fuel. My 15% nitro reading is closer to your reading, so I would consider it the right reading. I will re-test when I purchase my next 10% can. This is odd. Any more ideas?

Anyways, Boi. Take a reading on your RPMs on both engines with the fuel you have. Then, you will have a benchmark and reference point. In other words, in my case, the OS.46 is enough engine for the airplane to do big open loops with enough vertical pull.

Thanks
Pedro

asmund

Actually the mvvs will spin the 12.25-3.75 at 13600 with some portwork on the outside of the sleeve This is on 0% nitro too[8D] the apc 12-4 gave exactly 14000 at peak rpm

wildchild45177

My Feedback: (11)

Prgonzalez, If you have a computer radio, set the plane up twice. One with the 11x5, and the other with the 12x4. Then all you have to do is change models, and you,re good to go.

Bob

prgonzalez

Hi Bob,

Yes, that is one option. But sometimes we are too lazy for doing somethings. But, I will do next time I switch prop.

Thanks
Pedro