RE: SK ENGINES

RE: SK ENGINES
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RE: SK ENGINES - 9/16/2006 9:54:38 PM

Ed_Moorman

Posts: 3684
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

I ran Foxes for years in both control line and RC, starting with a 4-bolt Fox .35 back in 1952 followed by many Fox Combat Specials. I had a couple of Fox .45s, an ABC .46 and a couple of Fox .50s. I used the .50s in a twin. I also had one .61, so I am plenty familiar with Foxes.

I flew the SK .91/Ultra Stick for 2 flights this morning using a Zinger 15-6. Good thing I'm running big wheels because a 15 inch prop is pretty long for the normal UltraStick set up. I had it set like I usually set my engines, slightly rich leaving a little smoke trail in flight. It had plenty of pull giving the old, repaired (it has plywood sides) and heavy Ultra Stick good vertical. It has plenty of power for a vertical 8, even at partial power.

I did notice some leaning out in outsides, both outside squares and outside round loops and in eights. This sounds to me like I had the tank set too high for the OS and the SK doesn't need it. I do have the battery under the tank so I'll move the battery and lower the tank. It needs more rear weight, anyway.

As has been mentioned, it won't shut down on landing, but I expect this to clear up with more running. The idle is good, nice and low, but it won't quit. The acceleration from idle is good, but the sticky carb tends to make small power changes on final approach difficult. Seems like I need 3 or 4 clicks before the carb decides to let go and move.

It has been easy to flip start and it runs good so far. I am very pleased with the engine at this time, especially considering the price.

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to Turk1)

Post #: 76

RE: SK ENGINES - 9/16/2006 10:01:38 PM

Ed Cregger

Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Turk1

My 1 st SK 50 was my 3rd engine.I could run it very easily without any problem.So you dont really need to be an Engine expert for SK engines.
Ed, once Ray Nano informed me against my mail for SK 50;
:Quote"
Ahmet,

Because you are running no nitro fuel I think you should prop for around 10-11,000 static.
This will allow it to unload to around 12,000 in flight.

Ray Nano
Kangke / Super Kraft / Brison / SK Engines
Tech Support/Design Team"
Quote

-----------------

That sounds like conventional rpm to me. I know I'll be happy with the SK engines.

I was worried that he had sold the business to someone else less knowledgeable. It is good to know that he is still behind Kangke.

I talked to Ray before some years ago. I had to chide him out of hiding back then too. <G>

_____________________________

Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to Turk1)

Post #: 77

RE: SK ENGINES - 9/17/2006 12:24:46 AM

Oldbob

Posts: 158
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

Ed, I have an SK-50 and at first the carb barrel seemed to rotate fine but as I ran the engine the stinking problem got worse not better. In my case it was a sharp edge sticking up along the metering slot. The vibration from running seems to cause this sharp edge to dig into the carb housing. This is an easy fix so IMO do it ASAP. Using a strong magnifying glass (10X if you have it) you can see this up-turned edge. Use a fine file and remove the edge then smooth the entire carb barrel with #1000 wet/dry sandpaper and after run oil.

My SK-50 only has about a quart of fuel through it and already runs great. Idle is rock solid at 2000 RPM and top end 12000+ with an APC 11X6. The throttle response can be as fine as your servo can move it. Mine is going into a 46 size P-51

oldbob

(in reply to Ed Cregger)

Post #: 78

RE: SK ENGINES - 9/17/2006 3:16:30 AM

acgeorge

Posts: 45
Joined: 10/19/2004
From: Defiance, OH, USA
Status: offline

I'm having trouble with a SK .90, mounted inverted in a 60 size P-51. I broke in the engine upright, it runs great. Now that I it have mounted inverted, I can't keep it running without glow power. I have a low profile tank mounted at the CG, basically sits on top of the wing, placing the centerline of the tank even with the needle on the carb. Also have a perry V-30, due to the distance of the tank from the engine. The idle needle is set at 1-1/2 turns and the high speed needle at 2-1/2 turns. Tried a plug with idle bar, not much help. Seems like, onboard, always on, glow power is a option. I could lower the tank a little further if I move it up against the firewall; was hoping to keep it at the CG.

Any help would be appreciated.

Andy

(in reply to Oldbob)

Post #: 79

RE: SK ENGINES - 9/17/2006 3:50:53 AM

Oldbob

Posts: 158
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

ACGEORGE, I have had the same problem with inverter engines, both 2s and 4s and with several different makes of engines. Many engines seem to run rich when inverted in the plane. What I do is lean the idle needle 1/8 turn at a time until the engine stays running at idle without a change in RPM when the battery is disconnected. Also to help an inverted engine idle better I use an OS F glow plug. It has a larger glow element and seems to stay hot longer.

(in reply to acgeorge)

Post #: 80

RE: SK ENGINES - 9/17/2006 5:44:39 AM

rustypep

Posts: 342
Joined: 9/12/2004
From: Powell, OH, USA
Status: offline

My SK 50 didn't want to shut down until I ran several tanks through it and than I was able to lean out the low end more and this problem went away.

quote:

ORIGINAL: Ed_Moorman

As has been mentioned, it won't shut down on landing, but I expect this to clear up with more running. The idle is good, nice and low, but it won't quit. The acceleration from idle is good, but the sticky carb tends to make small power changes on final approach difficult. Seems like I need 3 or 4 clicks before the carb decides to let go and move.

It has been easy to flip start and it runs good so far. I am very pleased with the engine at this time, especially considering the price.

_____________________________

Club Saito Member 354

(in reply to Ed_Moorman)

Post #: 81

RE: SK ENGINES - 9/17/2006 11:20:20 AM

Ed Cregger

Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Oldbob

Ed, I have an SK-50 and at first the carb barrel seemed to rotate fine but as I ran the engine the stinking problem got worse not better. In my case it was a sharp edge sticking up along the metering slot. The vibration from running seems to cause this sharp edge to dig into the carb housing. This is an easy fix so IMO do it ASAP. Using a strong magnifying glass (10X if you have it) you can see this up-turned edge. Use a fine file and remove the edge then smooth the entire carb barrel with #1000 wet/dry sandpaper and after run oil.

My SK-50 only has about a quart of fuel through it and already runs great. Idle is rock solid at 2000 RPM and top end 12000+ with an APC 11X6. The throttle response can be as fine as your servo can move it. Mine is going into a 46 size P-51

oldbob

----------------

Thanks for the tip, Oldbob. I'll take care of that quickly.

_____________________________

Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to Oldbob)

Post #: 82

RE: SK ENGINES - 9/17/2006 11:27:31 AM

Turk1

Posts: 645
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

OldBob,how much nitro in your fuel giving that 12000+ RPM s?Also what is oil content?

(in reply to rustypep)

Post #: 83

RE: SK ENGINES - 9/17/2006 6:25:13 PM

Oldbob

Posts: 158
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

Turk, I am using 15% nitro, 18% oil synthetic/caster blend Power Master. Yesterday I purchased some 5% and 10% nitro fuel and will try it out after it stops raining. Also I am using an OS#8 glow plug. The engine is mounted upright on the test stand but will be inverted in the P51. I will keep you posted.

(in reply to Turk1)

Post #: 84

RE: SK ENGINES - 9/17/2006 7:01:04 PM

Turk1

Posts: 645
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline

Thanks Oldbob.Good luck.

(in reply to Oldbob)

Post #: 85

RE: SK ENGINES - 9/17/2006 7:04:08 PM

Ed_Moorman

Posts: 3684
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

Artisan, you're right. I pulled the drum out and looked at it under a magnifying glass and there were raised areas at both ends of the groove. I touched them up with a fine file and it works a bunch better. Thanks.

You're from Ringgold, did you ever go to the old Big Bird meet there?

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to Turk1)

Post #: 86

RE: SK ENGINES - 9/17/2006 9:01:09 PM

Oldbob

Posts: 158
Joined: 6/29/2005
From: georgetown, TX, USA
Status: offline

Well it stopped raining long enough for me to run the different fuels. I ran the three different nitro blends within 30 minutes. Therefore the weather should not be a variable.

So here is the data. Engine, SK 50; Prop APC 11X6; Glow Plug OS#8; Weather, very high humidity, just stopped raining.

5% nitro 11,900 peak RPM
10% nitro 12,100 peak RPM
15% nitro 12,300 peak RPM

With each fuel I had a steady 2,000-RPM idle. However, with the 5% fuel the engine started to load-up after a minute or so. I did not reset the low-speed needle valve to run this test, but I believe that the 5% fuel will idle as long as the 10% and 15% fuels if the low-speed needle is adjusted properly.

oldbob

(in reply to Ed_Moorman)

Post #: 87

RE: SK ENGINES - 9/17/2006 9:20:25 PM

Ed Cregger

Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Ed_Moorman

Artisan, you're right. I pulled the drum out and looked at it under a magnifying glass and there were raised areas at both ends of the groove. I touched them up with a fine file and it works a bunch better. Thanks.

You're from Ringgold, did you ever go to the old Big Bird meet there?

--------------

Glad to be of service.

No, I'm a transplant (NJ) and I've never heard of the Big Bird meet. I have much to learn about this area.

_____________________________

Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to Ed_Moorman)

Post #: 88

RE: SK ENGINES - 9/17/2006 9:54:36 PM

Ed Cregger

Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline