RCVFR

My Feedback: (7)

Thanks for your comments on the SK 130. I have been trying to get some hands on information without sucess, and I am glad to see it is a good performer.

72

I am confident it will only get better in the air but until I get my muffler that will have to wait. Amazingly easy to start.

The Canadian distributor is in Acton, On uniquercimports.com
Ian D'Orazio
Unique RC Imports
905 702 4740 Cell

Turk1

At last I could measure RPM s of my oldest SK 50 today on my good old trainer Excel 2000. Surviving many crashes and bearing change.Only one shim left on head for sealing function.
Temp 91-95 F Humidity high,about 100-200 meters above of sea level.
Fuel Industrial methanol, 20 % full castor, self mix fuel,no nitro. OS A3 plug.Prop 12-5 APC( On your advise both Ed s, thanks Im happy with it) with spinner and DuBro exhaust deflector.
12120 RPM highest. After installing BruLine type air filter it fell 11900 RPM max.
Tach was Hobbico.

XJet

Man, that's pretty weak. Even in the middle of summer my TT46Pros will turn a prop that big in the low 13,000s or so and I get around 13,600-13,900 on an APC 12x4.

I thought the SKs performed best on bigger props like this.

OVER WORKED

At 12,000 RPM Turk's engine with a 12/5 APC is making about 1.1 horsepower according to my calculator, and thats on NO NITRO fuel at 200 METERS and 90 Degrees, thats a density altitude of about 4.000 feet making around 7.5 pounds of thrust. And he's using an exhaust deflector, something well known for not boosting power.

At 13,500 with a 12/4 APC, XJet is making 1.25 hp and around 7.8 pounds of thrust. don't know about altitude (so I used 1,000 feet} or nitro, but 10% will boost RPM in most small engines about 700-1,000 over FAI fuel.

To turn a 12/5 at 13,500 you would need to make almost 1.6 HP, and would generate about 9.5 pounds of thrust {you are now in the thrust numbers of most 70+ size engines}.
In a 50 size engine that would be a very impressive number without a pipe and some high nitro, and even then I would be impressed.

Seems the word is out on the SK line of engines, We sold almost 300 in one month a new record for us.

RCVFR

My Feedback: (7)

Xjet, you have a most exceptional engine there. Treasure it.

ckangaroo70

My Feedback: (51)

I've been running my SK 50 quite a bit on my Bridi Vagabond 40. It usually starts first flip, and pulls the Plane around without breaking a sweat. I would guess I have about 30 flights on this Plane, and never a deadstick. The SK 50 has been extremely dependable and trouble free running on Cool Power 15% and an 11x6 apc prop. It seems to pull a heck of alot harder with the 12x5, but a 12x5 just don't have enough clearence on the Vagabond. The carb barrel does seem to stick before it gets to wide open, but it opens to about 95% and that is plenty. I hate to mess with it since it is running so well. Awesome engine in my opinion, and a steal at $59.

NM2K

My Feedback: (14)

Get yourself a wire bender and make up a set of landing gear struts that are about three quarters to one inch longer than the existing struts. Even I can do it. I use a Breiten bender that I bought long ago. You can buy some wire struts with the coils already in them and then tailor them to fit your model with ease. Larger wheels help too.


Ed Cregger

rustypep

My Feedback: (6)

I had to do the same thing with my Kaos. The Saito 91 didn't have enough prop clearance even with a three bladed prop. I got a K&B bender that I believe I got from Tower along with some new piano wire.

I am pretty happy with my SK 50 swinging a 12x5 around 12,000. The one time the muffler rod broke and I lost half the muffler the engine kept running and I landed without a problem. I would believe the thrust is at least 7 pounds on it. It isn't unlimited on my Ultra Stick 40 but another 25% or so of power would probably put it there so seven pounds or so of thrust sounds about right.

XJet

I'm at 380 meters (1135 feet) ASL and I run just 5% nitro with 12% Cooper's Plus C oil and a Tower Muffler.

What I'd really like to see is how well the SK's throttle and transition. I also wonder what the all-up weight is?

If they're as torquey as its' claimed and if they throttle/transition as well as a TT they might make a good 3D engine.

I'm sorely tempted to try one but they just look identical to the Tiger Shark 56 that I bought a few years back. That engine was an utter dog and soured me to that particular style of Chinese engines -- although my other Chinese engines such as ASP/Sanye and GMS seem to work just fine.

XJet

All the TT46Pros in our club run that well -- I think the Coopers' oil helps a *lot*.

Here's a video I've posted before, it'll give you an idea of how much difference the "good oil" can make to an otherwise regular sport engine. Note it's turning a 12x4 prop!

http://www.youtube.com/watch?v=gck69lc2HoE

and the high-winged trainer plane in this next video was clocked at over 110mph on the straight and level with another TT46Pro up front.

http://www.youtube.com/watch?v=EYRpT3UMFNY

We're at 1100 feet ASL too.

rustypep

My Feedback: (6)

Spend the $60 plus shipping and put two to three gallons through an SK 50 and if you are not happy with it I am sure someone here would be willing to buy it used as long as you take care of it. It is reliable and has good throttle/transition and I use it for aerobatics/minor 3D in my UltraStick. Mine idles very well. I also own a new TT 46 Pro (bought at the same time) that is in a six pound pattern plane (old Hobbico Spectrum) and I am not getting the type of numbers you mentioned at 425 ft ASL on 15% nitro. It has a tunnel for a tuned pipe that will be my next step. The weight of the SK 50 is 16.6 oz but off hand I can't remember if that included the muffler. I don't think it does. An OS 55AX will probably outperform it slightly but at 2.5 times the cost.

72

Here is a picture of my SK130 and a Bisson custom Ultimate muffler. Sure sounds nice in the air.
Bisson now has the templates for this engine and can build them as required. Mine was the first one and it fits perfect. Really nice job!!

Ed_Moorman

My Feedback: (1)

What size prop are you running on the 1.30?

72

Ed, the prop in the picture is an APC 16x8. I have a 15x8,15x10,16x6 and 16x8 in my box so far. As the engine breaks in I will go bigger. I have only flown the Ultimate (10 lbs.) with the 16x8 but it comes off the ground at half throttle and pulls big time. Sounds great with the Bisson.
Ray at Kangke is running a 17x6 around 8000 rpm so that will be my next prop. Then whatever gives me 8500-9000 after the engine is good and broken in.

PointMagu

My Feedback: (11)

Nice engine!

I ran my new SK80 for the 1st time today...mounted in the nose of a cloned P-51. I put 48 oz of SIG 15% running an APC 13x6 prop.

Nice and rich, it's idle was smooth. Never took it above 40% throttle as she'd choke off from raw fuel. I figure another 32 oz and I'll start leaning the high-speed needle. I didn't touch the low end as I figure it was factory set.

At that 40%, the 80 was tugging at the teather. This engine should be plenty of beef to haul the Mustang around the sky.

Here's a quick photo:

PM

RCVFR

My Feedback: (7)

I recently bought the SK 50 and installed it on a Phoenix Decathlon after break in. Previously had a Mag 52 4 stroke in it turning an ASP 12X6, but it bothered me to be at full throttle most of the time. The SK 50 flies the plane with the same prop, but with reserve throttle for up lines, much improved handling. I have been experimenting with different props, and today, I put on an ASP 13X6N. WOW! It gives incredible smoothness to all maneuvers, the plane flies a bit slower and with complete authority and very solid in all attitudes. Sort of blows my preconceptions as to prop sizing! Tached at 9500 rpm.

Fuel is cool power 5%.

72

You don't have to run these real rich- just not lean. Break them in the way the instructions tell you to and it will turn into a great engine I think. They are constructed differently from what we are used to and have an ABC type cylinder profile along with the ring. Slobbering rich not required!

PointMagu

My Feedback: (11)

I couldn't refer to instructions as I've misplaced them. I could have posted here and asked but that would have shown initiative, LOL...

The day was windy but beautiful so all it cost me was some fuel. I wouldn't have flown her today anyway. Next weekend, I'll do that thing and run the engine as specified.

Thanks for the input!

PM

72

Try this link and look under instructions. Ray Nano is the guy that designed these engines and also the guy who answers your email questions. Great response to all the emails I have sent him. Really good service if you ask me.

http://www.kangkeusa.com/skengines.htm

playntraffic

I have a new SK50 that I put in a 6lb Pheonix 300s. I broke it in over the weekend per the instructions. First couple of tanks were with an APC 11x5 and then I moved on to trying 11x7, 12x4, and finally a 12x6.

I have run about 12 tanks through it and still have the same problem. I chalked it up to break-in, but now I am starting to wonder. At 3/4 throttle the rpms are higher than full throttle. The engine picks up rpm up until 3/4 and then drops off a bit at WOT. I have adjusted the high speed needle with a tach and have a nice 2min + idle with no stumble at throttle up. Is this a concern, or should I be more patient with the break in?

RCVFR

My Feedback: (7)

On first thought, it sounds like too lean a setting. When you set the high end with a tach, did you back off from peak? Check your high end setting with the pinch test. It should increase rpm briefly when it is set right. If it doesn't increase rpm, it's too lean.

72

Sound to me too like it is too lean. I don't know the 50, but if it has a ring it will take a couple of gallons to break in nice. I think if you richen it up a bit and then vary your engine speed in the air it will get better every tank. Remember that the longer it takes to break in, the longer it will last . You can't expect an engine to break in with a tank of gas and then last for 30 years!

Turk1

There can be several reasons for that.One of them your idle needle is too much out or in.Or you should lighten the load(less prop).Take a look at your idle needle position against spray bar.It should be less than one millimeter.

2thelmt

Thanks for the plug 72...That 26% Kangke Extra I showed you can been seen flying in Georgetown at the HHMFC...come fly as my guest. Mine will be flying soon with the Rev-50!

Anyone in Canada who would like to purchase one of these great running engines, drop me a call 905 702 4740 or e-mail me direct to my Blackberry [email protected]
We also carry the Revolution REV-50 50cc and Brison Engines-Made in Canada

Ian D'Orazio

P.S. My original SK 50 two years now has never dead-sticked...12 X 5 APC is a perrrrfect match!