RE: SK ENGINES

RE: SK ENGINES
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RE: SK ENGINES - 9/28/2006 12:53:06 AM

bubbap51

Posts: 129
Joined: 3/19/2006
From: temple, GA, USA
Status: offline

Thanks Ed, I will get a 12x5 and try it out. I will let you all know how it does.

(in reply to Ed_Moorman)

Post #: 126

RE: SK ENGINES - 9/28/2006 4:19:49 AM

mitchmcf

Posts: 111
Joined: 2/21/2004
From: West Elelizabeth, PA, USA
Status: offline

I had a Sk .50 on my FunAir and I used a apc 12.25x3.75 and it worked well for 3D work.

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Post #: 127

RE: SK ENGINES - 9/28/2006 8:09:32 AM

Turk1

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

I am using 11-6 Kavan prop on my SK 50 on an Excel 2000 trainer,gets a heavy with repeated repairs.(About 6 lbs).My SK 50 pulls it nearly unlimited vertical.I am using no nitro,20% full castor and industrial methanol.So you, using some nitro and some lighter oil in fuel can load it more than me I think.Ray Nano advised me to keep revs about 10-11 K on ground for best results.

< Message edited by Turk1 -- 9/28/2006 8:10:09 AM >

(in reply to mitchmcf)

Post #: 128

RE: SK ENGINES - 9/29/2006 11:21:29 PM

Ed_Moorman

Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

Turk, you da man. You were the first to fly and talk up SK engines on RCU here that I recall. I seem to remember in other threads when people were talking about other engines, you were saying SK. It took the rest of us a while to see what you discovered. And you're running all castor and no nitro. An 11-6 is a little less load than a 12-5 so with no nitro I imagine it ought to be right on.

I like my 90 so much I have a 50 on order. It'll end up first on my Big Stick 40 that has a Swiss cheese engine mount from so many different engines. After I get some flights on the Stick, I'll pull my Heckler out and run the SK 50 on it. I sure hope it flies like the 90.

I'll be they would work well on a seaplane since you need extra power to pull the extra drag and weight of the floats. A 4-stroke does well, but I hate to get them wet in the occasional flip over. I've been taxiing back and had the wind blow my seaplane over. I don't think a 15 inch prop would work on a .46 size seaplane, but has anyone tried the 70? It might run a 13" prop.

_____________________________

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

(in reply to Turk1)

Post #: 129

RE: SK ENGINES - 9/30/2006 1:45:39 PM

Turk1

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

Hi Ed Moorman(there is another Ed"Cregger" as Artisan,so I have to use surnames too).I took a look at my SK 80 s manual,mentioning for .80 engine(ringed):start prop-13-6, range 11-7,14-4. So I hope you can have an idea for a SK.70(ringless) prop.

(in reply to Ed_Moorman)

Post #: 130

RE: SK ENGINES - 9/30/2006 2:15:32 PM

Ed Cregger

Posts: 7735
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Turk1

Hi Ed Moorman(there is another Ed"Cregger" as Artisan,so I have to use surnames too).I took a look at my SK 80 s manual,mentioning for .80 engine(ringed):start prop-13-6, range 11-7,14-4. So I hope you can have an idea for a SK.70(ringless) prop.

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

I wonder why so many sizes of the same engine? Especially when most manufacturers just do a .61, .75 and a .90? It would be interesting to understand their thinking in this regard. Probably a good story.

My .70 size four-strokes run best, for my applications, on a 13x6. This is for normal sport flying, not hovering, etc.

It has finally cooled off some outside. Time to drag out the test bench and start running some engines, right after I mow the lawn...<G>

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Artisan

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

(in reply to Turk1)

Post #: 131

RE: SK ENGINES - 10/1/2006 7:05:54 PM

Ed_Moorman

Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

I asked Ray Nano about the sizes listed as opposed to the actual displacement and he told me that they had Tiger Shark and SK engines available at the same time and the Tiger Sharks were .52, .75. and .91, so to distinguish the SKs, they called them 50, 70, 80, 90.

Actual displacements are:
50 = .525
70 = .75
80 = .80
90 = .91

I flew the SK 90 powered Ultra Stick some more today. I was trying to find a problem in the running somewhere. A common problem with Chinese engines is a rich mid-range. Several times I throttled back to half power and flew around for 2-3-4 minutes, then popped to full power. Instant acceleration. Properly tuned, there is no rich mid-range. I have already tested the idle, but I gave it another long idle. I throttled back at high altitude, hit crow and landed, I taxied in, then idled for 30 seconds more, timed on my watch, then hit full power. Right to full power, no hesitation, no stumble.

I only have 3/4" to 1" ground clearance with a 15" prop so I haven't tried an APC, but this weekend I have a Master Airscrew Scimitar 15-6 prop. It does pull stronger than the Zinger. Next weekend I am trying a 15-8 just to see how that runs.

I know I have said this several times before, but I am very impressed with the SK .91. I did take a while to break in and did take some careful adjustment, but now I don't recall a better running engine of this size that I have seen or owned. It's not a speed deamon, but if you want tractor like pull on a big prop and are willing to do the break in and adjustment, you can buy 2 of these for less than one of the high priced spread.

_____________________________

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

(in reply to Ed Cregger)

Post #: 132

RE: SK ENGINES - 10/2/2006 3:48:21 AM

Ed Cregger

Posts: 7735
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Ed_Moorman

I asked Ray Nano about the sizes listed as opposed to the actual displacement and he told me that they had Tiger Shark and SK engines available at the same time and the Tiger Sharks were .52, .75. and .91, so to distinguish the SKs, they called them 50, 70, 80, 90.

Actual displacements are:
50 = .525
70 = .75
80 = .80
90 = .91

I flew the SK 90 powered Ultra Stick some more today. I was trying to find a problem in the running somewhere. A common problem with Chinese engines is a rich mid-range. Several times I throttled back to half power and flew around for 2-3-4 minutes, then popped to full power. Instant acceleration. Properly tuned, there is no rich mid-range. I have already tested the idle, but I gave it another long idle. I throttled back at high altitude, hit crow and landed, I taxied in, then idled for 30 seconds more, timed on my watch, then hit full power. Right to full power, no hesitation, no stumble.

I only have 3/4" to 1" ground clearance with a 15" prop so I haven't tried an APC, but this weekend I have a Master Airscrew Scimitar 15-6 prop. It does pull stronger than the Zinger. Next weekend I am trying a 15-8 just to see how that runs.

I know I have said this several times before, but I am very impressed with the SK .91. I did take a while to break in and did take some careful adjustment, but now I don't recall a better running engine of this size that I have seen or owned. It's not a speed deamon, but if you want tractor like pull on a big prop and are willing to do the break in and adjustment, you can buy 2 of these for less than one of the high priced spread.

-----------

I appreciate your engine evaluation, Ed. It makes me look forward to breaking-in mine and getting it airborne. Thanks a bunch.

_____________________________

Artisan

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

(in reply to Ed_Moorman)

Post #: 133

RE: SK ENGINES - 10/12/2006 1:48:39 AM

Ed_Moorman

Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

My .91 feels like it is gettng stronger every weekend. Not by much, but it is yanking an old, repaired, over 8 pound Ultra Stick around pretty well. It also seems to be getting better gas mileage because I am leaning it out slightly over time. I'll probably drop down from a 14 oz tank to a 12 oz.

I bought the 50 and have 1 flight on it on a Big Stick 40. Can't say much about it yet, but I may buy another .91. The one I have is grrreat. The 50 needs more time, but I've been having so much fun flying the .91 powered Stick, I can't stop flying it.

_____________________________

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

(in reply to Ed Cregger)

Post #: 134

RE: SK ENGINES - 10/12/2006 2:26:30 AM

PointMagu

Posts: 609
Joined: 1/29/2005
From: Cumberland, MD, USA
Status: offline

I messed around with differing props and continued to lean my 50 out as I flew it on my Aerobat.

I am impressed with instant starts, smooth transitions from low to mid and mid to high and back again. I fly with absolute confidence my engine isn't going to flame out on low speed passes or low aerobatics. I take off, do 2 aileron rolls and climb for the heavens while torque-rolling until I apex-out, hammerhead over and return to earth.

yep, gotta love dat SK 50...

PM

_____________________________

Ah yes, snakes in the cockpit....

(in reply to Ed_Moorman)

Post #: 135

RE: SK ENGINES - 10/14/2006 12:48:56 AM

Ed_Moorman

Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline

Hey, did anyone else notice the price of the 90 has gone up by $10?

I should have ordered my second one last week.

_____________________________

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

(in reply to PointMagu)

Post #: 136

RE: SK ENGINES - 10/14/2006 2:07:49 PM

Ed Cregger

Posts: 7735
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline

quote:

ORIGINAL: Ed_Moorman

Hey, did anyone else notice the price of the 90 has gone up by $10?

I should have ordered my second one last week.

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

It appears that Magnum Syndrome is spreading. Time to buy from Peak Model again, I guess. (wink)

_____________________________

Artisan

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

(in reply to Ed_Moorman)

Post #: 137

RE: SK ENGINES - 1/11/2007 3:08:04 AM

bubbap51

Posts: 129
Joined: 3/19/2006
From: temple, GA, USA
Status: offline

My SK 50 is doing just fine. 8 more flights this weekend and NO deadsticks or trouble. I have about 3 gallons thru it now. I have leaned out the HS needle a bit and richend up the low end just a hair. I am using a 12x6 on a nexstar for training and buddy box work. Switching from an 11x5 to a 12x6 really made it tick. I couldn't be happier with such an inexpensive engine. It seems to run forever on 1/2 throttle. It is just as reliable as my 46AX at 1/2 the cost.

(in reply to PointMagu)

Post #: 138

RE: SK ENGINES - 1/11/2007 8:35:27 AM

Turk1

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

Hi,I noticed a slight problem on some SK 50 engines on mine and a friends.Weather gets colder everyday here so I am thinking more dense full castor fuel is the main reason.My problem,if I try some leaner idling to have better idling,then on a certain midrange(about half)
engine gets leaner and cant compansate any more trottle if push stick fast and stops.So I have to keep a good rich my low speed needle.High speed needle seems uneffective on this.I think heavier fuel cant pass on those tiny passages fast enough to compansate.I will reduce castor percentage in my fuel for those winter days.

< Message edited by Turk1 -- 1/11/2007 8:41:16 AM >

(in reply to bubbap51)

Post #: 139

RE: SK ENGINES - 1/11/2007 2:04:16 PM

ckangaroo70

Posts: 2084
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline

After owning 2 SK 90's, I decided to order a SK 50