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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Run In
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Run In - 10/2/2006 1:11:11 PM   
CrocEnd


 

Posts: 498
Joined: 2/16/2003
From: Darwin, AUSTRALIA
Status: offline 		35/60lx/90 any diff., in running IN
       Post #: 1

RE: Run In - 10/2/2006 1:12:35 PM   
CrocEnd


 

Posts: 498
Joined: 2/16/2003
From: Darwin, AUSTRALIA
Status: offline 		Oh and what nitro con.

(in reply to CrocEnd)
       Post #: 2

RE: Run In - 10/2/2006 1:27:28 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hi,

Thanks for writing.

The break-in proceedure is the same for all of them. The only thing different is the prop selection and the rpm target you are looking for.

You want a prop that is basically one "size" smaller than you will be flying with. The concept is to take the engine to a clean 2 cycle, properly loaded, and approach its intended ground rpm while the engine is running just slightly rich (running without risk of overheating).

For the 35, an 8x6 works well - target 18,500

For the 60LX we usually recommend using an APC 8.8x8.5 or an 8.75x9W clipped down to about 8.25" diameter. Target 18,500
(Prop selection in this particular case mainly because the hubs on a standard 9x6, 9x7 are not really suited to turning 18-19-20K rpm)

For the SJ-90 we usually use an 11x6 or 11x7 - target 14,500
For the 90LX engines one can use the 11x7 as well, but target for around 15-15,300 for break-in. (engine flys great with that prop too).

Fuel..... break in on what ever you plan to run the engine on. Any decent fuel is ok, and we recommend using a synthetic/castor blend fuel. Our baseline published information is using 15% nitro. Nitro content from 5% to 30% is ok (some folks have asked in the past about using their heli fuel, just because the 'have it', and that is ok).

I personally fly the same 15% powermaster fuel in all of my engines (except the OS160).

I hope this is helpful

Bob


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to CrocEnd)
       Post #: 3

RE: Run In - 10/2/2006 2:11:27 PM   
CrocEnd


 

Posts: 498
Joined: 2/16/2003
From: Darwin, AUSTRALIA
Status: offline 		Thanx Bob
My main worry is I live in a wet and dry season climate.
The fuel I tend to use is 10% nitro 20% oil syn., Mixed and brewed by the lhs here any blend.
Just coming into wet season called build up.
The one size smaller prop I have allways done.
Cheer's Bob

(in reply to bob27s)
       Post #: 4

RE: Run In - 10/2/2006 2:41:43 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		No problem......

A reminder.... especially since you are brewing your own fuel..... and apparently dealing with moisture....

Be sure to oil down the engine with airtool oil or similar after-run product after you are done running it for the day.


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to CrocEnd)
       Post #: 5

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> Run In
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