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Engine basics => Engine set up tips => Topic started by: jonuck on August 21, 2007, 01:04:54 PM

Title: OS15LA
Post by: jonuck on August 21, 2007, 01:04:54 PM

Have recently rescued an OS15LA from an RC Flyer (Strewth!!) ............ This is the Blue one with the Needle Valve at the rear on the Backplate.  I intend to fit a suitable Venturi and use the rear needle valve and I was wondering if anyone has any input regarding this setup for Control line use ........ Pro's and Con's.........................   

Title: Re: OS15LA
Post by: Dennis Moritz on August 21, 2007, 06:11:24 PM

FP needle valve and venturi are available from Tower. Great running engines. On the fast side. Let it rip.

Title: Re: OS15LA
Post by: jonuck on August 21, 2007, 08:05:42 PM

Quote from: Dennis Moritz on August 21, 2007, 06:11:24 PM

FP needle valve and venturi are available from Tower. Great running engines. On the fast side. Let it rip.

Thanks for response Dennis ............... You would therefore suggest a standard spraybar through the venturi and discard the remote needlevalve .................. Sounds like a plan................. ;)

Title: Re: OS15LA
Post by: Jim Oliver on August 21, 2007, 08:25:46 PM

After having "some" trouble with the original remote NV, I installed the correct OS NVA in the venturi and just cut the remote NV off the back plate.

I also enlarged the hole in the muffler baffle plate to about 2x what it was.  Running a MasterAirscrew 8x4 at about 10,000 on Powermaster 10/22. Gives a reliable wet two stroke until the last 2 or 3 laps on my grandson's Ringmaster Jr.

Jim

Title: Re: OS15LA
Post by: Bill Little on August 22, 2007, 07:49:45 AM

Quote from: jonuck on August 21, 2007, 08:05:42 PM

Thanks for response Dennis ............... You would therefore suggest a standard spraybar through the venturi and discard the remote needlevalve .................. Sounds like a plan................. ;)

I agree with the other guys.  The remote NVA has to go!  A standard "FP 15" NVA and Venturi (restrictor) from Tower is the way to go.  Save the headaches before they have a chance to start.

Title: Re: OS15LA
Post by: Bob Zambelli on August 22, 2007, 08:16:29 AM

Agree with all! It's also quite a bargain, especially used.

The LA .15 is a fine little sport engine. I bought mine as an RC version, made a quick venturi and was in business.

Mine had a rather bulky baffled muffler. I removed the baffle, shortened and lightened it and it works perfectly.

I run a 7-6 Master Airscrew and Brodak 10/23 fuel. Single vent tank, no uniflow, no muffler pressure.

Set is lean on the ground and let it scream through the flight.

Bob Z.

Title: Re: OS15LA
Post by: jonuck on August 22, 2007, 01:06:58 PM

Many thanks Guy's for your input ............. I truly think I am on track for a barrel of fun with this little Jewel ......... just wish the RC lads would get out of the habit of tying there engines down with 1/4 20 bolts though!!......... LOL... ;D

Title: Re: OS15LA
Post by: James Lee on August 24, 2007, 03:27:37 PM

Todd put a pair of 15 LA's on his Trixter A-B Twin...   used the 15 FP backplates with 15 FP nva's and venturi's.  He removed the baffle from the stock mufflers...   APC 8x4 props and a nice two stroke setting on Sig 10% Champion fuel.  They run like a pair of little watches!
Jim