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 on: January 09, 2019, 05:25:40 PM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Hello everyone!
Made after-run procedure for engines. Have been doing the same way for a long time. Originally offered me to use by Maksim Svetlakov works very well. The great advantage, you don't need to play around if the engine was stored long time (lets say over winter). Just plug and play, startup no problem at all

 on: September 15, 2018, 07:22:33 PM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Here is a few docs related to the topic.
English and Russian version

 on: August 02, 2017, 02:56:58 AM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Downloadable catalog. PDF file in Russian

 on: April 29, 2014, 07:03:34 PM 
Started by iant - Last post by Yaroslav Melnikov
The problem is the bearing seat diameter quite varies as well as the bearing outer rings diameter and the radial balls clearance due to some tolerance while the production. While assembling the engines the makers pick the bearing that better fit to a particular bearing seat. We are talking about a few microns here, but a few micron here-few microns there and the problem comes up. So it might happen in your engine the seat size is relatively small so once the aluminum gets cold after the bearing hot pressed, the crank case bearing's seat shrinks a bit shrinking the bearing outer ring too, thus reducing the balls radial play to some minimum number. At this point I would suggest to use any other bearing with more radial play, you can feel it easily - just play with a few bearing and you'll see the difference. The other solution might be to lap the bearing seat, but you've got to have a special tool and some skill. And also don't forget to slightly knock the crankshaft with light hammer from both sides, do that kind of multiple knocks - doing this you are align both nose and rear bearings to get the best axial play.

On some engines in my fleet I have to change rear bearings 2-5 times before I get desirable axial play.
You probably can leave it like that, but the engine might not be fast enough

 on: April 22, 2014, 08:43:53 AM 
Started by iant - Last post by iant
I have changed bearings in other types of engines & have never had any problems. I had a midair & hit the other guys muffler/ engine mounts with my engine. The bearings felt a bit rough afterwards so I have pulled the engine apart & fitted new Koyo bearings. The shaft spins freely but there is not discernable end float with a cold crankcase. My other engines have endfloat.. Is this a problem ?
I fitted the rear race to the shaft then heated the case & dropped it over the shaft, fitted the front race & retaining ring..
why no end float?
There was endfloat with the old bearings..

 on: January 17, 2014, 02:46:37 AM 
Started by Shawn Cook - Last post by Yaroslav Melnikov
Hi Shawn,

Sorry for the long time response, too much trouble with the weather lately in Ontario and since I'm in transportation business I had been totally into my work...

i recognize the symptoms, it happens normally due to the engine's temperature drops out of normal operational temperature range. As you know with gaining the speed the cylinder gets colder and combining with low outside temperature it causes the trouble sometimes. You did it right wrapping the cylinder with some material, it might help to keep the cylinder's temperature up, but there are also a few other solutions.

1) You might try to set the head clearance lower, the higher compression ratio - the higher the operational temperature
2) You might need to play with different props. Try to use lighter props (by pitch), or try to trim down the prop you use and see what happens.
3) Another solution might be using higher nitro fuel, probably 15-20%, or some fuel with less oil percentage. At this point I would recommend Cool Power 10%, it comes with 17% synthetic oil.
4) Since you tried multiple bladder material I skip this one...

That's what comes to my mind right away. Probably this is the constructional problem and needs some specific approach, but need more data like type of muffler used (6 or 8mm?). From what I see on the picture it's old F2D Kozel. What's the other one?
Henry Nelson recently shared some experience on similar problem resolved his friend had with 0.8cc Fora. Henry's solution was simple and effective - new needle. But that's Henry...

By the way. I wonder what the temperature was you put your flights on? My record - practice at -23C with F2D toys, but no much fun  Grin and that was back to 90s

 on: January 08, 2014, 12:27:52 AM 
Started by Shawn Cook - Last post by Shawn Cook
          Hello Aerohobby forum I finally was able to create a account thanks to Yaro. I had some questions regarding running .15 f2d engines and 1/2a engines in cold weather. It seems whenever winter rolls around I can never fly my models due to engine troubles no matter how rich I set my needles on the ground the planes fly maybe 30 sec and start going over lean. The engines surge back and forth as if its not getting fuel. Things I have tried with no success are wrapping yarn around the cylinder fins to keep heat in the engine , I tried all synthetic oil fuels , I have tried different bladder material , and new plugs with no luck. My regular fuel which works very well in warmer months is 10% nitro, 11%syn oil, 11% castor power master fuel. If you fly in cold weather or have any tips please share your ideas. Thanks Shawn

 on: August 28, 2013, 02:24:46 PM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Welcome to Dedicated Control Line combat forum!

The registration on this forum is disabled for new members due to huge spam volume I'm being the admin is not able to handle.
However if you will to participate in forum discussions and get registered - please send me e-mail with "registration" subject.
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Please send registration inquiry to: sales AT aerohobby DOT ca

Thank you and welcome to the forum!

 on: June 10, 2013, 02:32:24 PM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Contest draw results

 on: June 10, 2013, 02:29:45 PM 
Started by Yaroslav Melnikov - Last post by Yaroslav Melnikov
Contest report

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