Author Topic: OS 15 LA (Read 1977 times)

brian sisson · « **on:** August 23, 2023, 06:57:02 PM »

I am needing to convert an OS 15 LA to control line. Does anyone manufacture a control line carb ? Thanks

Brett Buck · « **Reply #1 on:** August 23, 2023, 07:18:48 PM »

Quote from: brian sisson on August 23, 2023, 06:57:02 PM

I am needing to convert an OS 15 LA to control line. Does anyone manufacture a control line carb ? Thanks

https://www.towerhobbies.com/product/venturi-15fp-s/OSMG9251.html - venturi only.

venturi and spraybar:

https://www.ebay.com/itm/223517272428?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338765313&toolid=20006&customid=f60447de682faac4b8eeda74b4c99802

Brett

brian sisson · « **Reply #2 on:** August 23, 2023, 07:36:33 PM »

Quote from: Brett Buck on August 23, 2023, 07:18:48 PM

https://www.towerhobbies.com/product/venturi-15fp-s/OSMG9251.html - venturi only.

venturi and spraybar:

https://www.ebay.com/itm/223517272428?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338765313&toolid=20006&customid=f60447de682faac4b8eeda74b4c99802

Brett

Thank you

Steve Dwyer · « **Reply #3 on:** August 24, 2023, 08:12:16 AM »

Try Bob Brooks good prices and probably faster service.

BOB BROOKS <shtterman@aol.com>

Brett Buck · « **Reply #4 on:** August 24, 2023, 09:28:16 AM »

Quote from: Steve Dwyer on August 24, 2023, 08:12:16 AM

Try Bob Brooks good prices and probably faster service.

That is the second link....

Brett

944_Jim · « **Reply #5 on:** August 24, 2023, 10:46:06 AM »

I used Lee Machine for my OS-LA conversions. YMMV.

Dan McEntee · « **Reply #6 on:** August 25, 2023, 03:19:58 AM »

Quote from: Brett Buck on August 24, 2023, 09:28:16 AM

That is the second link....

Brett

Contact Bob directly through that email address and you can save a few bucks. He deals direct outside eBay and I have heard rumors that he may drop eBay all together and deal direct only since all the new goofy rules went into place.
Type at you later,
Dan McEntee

Steve Dwyer · « **Reply #7 on:** August 25, 2023, 06:48:26 AM »

I just bought a USED OS LA 15 on E bay from Bob for my Pathfinder Twin project along with the parts to convert it to control line; aluminum back plate, gasket, front venturi, valve assy. and socket head screw set. Dismantling it I discovered sludge inside the engine leaving me to believe the engine had been under water. It all cleaned up well except there was corrosion on the wrist pin. Bob said this wasn't good and sent me free of charge a replacement pin and rod. I requested to buy the parts, after all I bought a used item "buyer beware" but not with Bob Brooks. He takes credit card or PayPal Easy Peasy.
BTW the 15 runs great.

Steve

Motorman · « **Reply #8 on:** August 25, 2023, 07:19:37 AM »

Save the pads from that wrist pin. They are one thing that wears out faster on the LA series.

Steve Dwyer · « **Reply #9 on:** August 25, 2023, 08:02:46 AM »

One pad was damaged during the pushing out the corroded pin. I have taken a number of OS engines apart and have never seen a pad worn out or any scoring of the cylinder. In most cases the pin pushes out easily. There must have been some thought given to the overall length of the pin and pads since the pin must elongate with heat. I wonder what material is used for the pad to withstand the heat at that location?

Steve

brian sisson · « **Reply #10 on:** August 27, 2023, 07:47:29 PM »

Thanks all. I purchased the one in the link Brett provided. I have yet to receive it,

redout · « **Reply #11 on:** August 28, 2023, 05:54:54 PM »

Quote from: Steve Dwyer on August 25, 2023, 08:02:46 AM

One pad was damaged during the pushing out the corroded pin. I have taken a number of OS engines apart and have never seen a pad worn out or any scoring of the cylinder. In most cases the pin pushes out easily. There must have been some thought given to the overall length of the pin and pads since the pin must elongate with heat. I wonder what material is used for the pad to withstand the heat at that location?

Steve

I'm pretty sure it is teflon.

Motorman · « **Reply #12 on:** August 28, 2023, 07:02:58 PM »

Yes, teflon. I guess I ment an engine that's been run. The back pad gets worn from the rod being pushed back. probably not so much in a stunt engine.

Steve Dwyer · « **Reply #13 on:** August 29, 2023, 05:50:09 AM »

Next time I remove a C-rod when usually to boil up an engine I'll check for variation in pad thickness.

Steve Dwyer · « **Reply #14 on:** August 29, 2023, 05:53:50 AM »

Quote from: brian sisson on August 27, 2023, 07:47:29 PM

Thanks all. I purchased the one in the link Brett provided. I have yet to receive it.

Brian,

Which one did you buy? The one from Brooks or Tower? I'm curious the wait time on delivery from Tower. Brooks usually packages next day with three days shipping.

Steve

Peter in Fairfax, VA · « **Reply #15 on:** August 29, 2023, 06:22:52 AM »

Dan,

What new eBay rules are concerning? I'm about three months into offering a large collection at 40 engines per week, and eBay seems stable.

thanks,

Peter

Dan McEntee · « **Reply #16 on:** August 29, 2023, 09:49:50 AM »

Quote from: Peter in Fairfax, VA on August 29, 2023, 06:22:52 AM

Dan,

What new eBay rules are concerning? I'm about three months into offering a large collection at 40 engines per week, and eBay seems stable.

thanks,

Peter

All the new rules concerning anything over $600 in sales, wanting you social security information, and other personal information and more new fees. I have bought lots of stuff on eBay but never did any selling. I know several sellers that have bailed and more leaning that way. What was your eBay name so I can check out your stuff. I am pretty sure I have bought stuff from you also, but it has been a while.
Type at you later,
Dan McEntee

Peter in Fairfax, VA · « **Reply #17 on:** August 29, 2023, 02:42:30 PM »

Dan,

Yes, you had a Fox project that needed some parts I had. Perhaps a twin?

Here's a current auction: https://www.ebay.com/itm/325781927454

eBay id: model_tech_traders

thanks,

Peter

brian sisson · « **Reply #18 on:** August 30, 2023, 06:36:11 PM »

Quote from: Steve Dwyer on August 29, 2023, 05:53:50 AM

Brian,

Which one did you buy? The one from Brooks or Tower? I'm curious the wait time on delivery from Tower. Brooks usually packages next day with three days shipping.

Steve

Brooks, from ebay. lightning fast shipping.

Marty Hammersmith · « **Reply #19 on:** October 10, 2023, 05:12:08 AM »

I too am converting an OS 15LA for control line. I purchased the venturi and needle valve on ebay. They fit perfectly. In regards to the tongue muffler, there is no provision on the one I bought. My tank is a "standard vent" Brodak metal 2 oz. Will this draw fuel ok or will I need to get pressure from somewhere?

Steve Helmick · « **Reply #20 on:** October 12, 2023, 10:55:52 AM »

If the venturi/spraybar is appropriate, it will NOT need pressure. BUT, I would suggest a "uniflow" tank to get an even run from launch to end. I do tend to like muffler pressure, but the reason is mostly that it stops getting tiny bugs and seeds into the uniflow intake.

If you can arrange a pressure tap on the muffler, run the hose to the uniflow intake. If you don't cap off the overflow tube on the tank, a uniflow tank runs like an old fashioned tank...richer at the start of the flight, going leaner later on. This is considered a good thing on a Fox .35 Stunt type of run, but not so much on a modern engine.

Steve