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General control line discussion => Classifieds => Topic started by: Paul Raley on June 08, 2025, 06:40:13 PM

Title: WTB : OS Max 20FP w/muffler (ABN Version)- Found one thanks!!
Post by: Paul Raley on June 08, 2025, 06:40:13 PM
Anyone have a spare 20FP w/muffler they would consider parting with?  Planning to build a killer Flight Streak.   TIA!
Title: Re: WTB : OS Max 20FP w/muffler
Post by: Colin McRae on June 09, 2025, 07:38:32 AM
Quote from: Paul Raley on June 08, 2025, 06:40:13 PM
Anyone have a spare 20FP w/muffler they would consider parting with?  Planning to build a killer Flight Streak.   TIA!

Paul, maybe you're aware, maybe not.

On the OS FP series engines, OS upgraded the design at some point from iron/steel piston/liner to ABN design but never changed the FP designation. So, you might want to clarify which version you want. It's easy to tell. The older iron/steel version has a bump on the side of the case.

I don't own a 20 FP, but I have run the FP newer ABN design. They are very similar to the LA series in how they operate.

As claimed by OS, the 20 FP (ABN) weighs 7 oz (engine itself). The iron/steel version a bit lighter at 6.8 oz. I believe they use the same muffler.



Title: Re: WTB : OS Max 20FP w/muffler
Post by: Paul Raley on June 09, 2025, 07:53:03 AM
Quote from: Colin McRae on June 09, 2025, 07:38:32 AM
Paul, maybe you're aware, maybe not.

On the OS FP series engines, OS upgraded the design at some point from iron/steel piston/liner to ABN design but never changed the FP designation. So, you might want to clarify which version you want. It's easy to tell. The older iron/steel version has a bump on the side of the case.

I don't own a 20 FP, but I have run the FP newer ABN design. They are very similar to the LA series in how they operate.

As claimed by OS, the 20 FP (ABN) weighs 7 oz (engine itself). The iron/steel version a bit lighter at 6.8 oz. I believe they use the same muffler.

Actually I just read that looking at old 20 FP posts here in Stunthanger.    It would be the newer ABN series that I am looking for.  Thank you!
Title: Re: WTB : OS Max 20FP w/muffler
Post by: Dan McEntee on June 09, 2025, 09:21:00 AM
Quote from: Paul Raley on June 09, 2025, 07:53:03 AM
Actually I just read that looking at old 20 FP posts here in Stunthanger.    It would be the newer ABN series that I am looking for.  Thank you!

  You can tell by the deference in the crank case on the left side where the bypass port is. I'm sure there have been pictures posted.

  Type at you later,
   Dan McEntee
Title: Re: WTB : OS Max 20FP w/muffler (ABN Version)
Post by: Dave Moritz on June 09, 2025, 10:46:47 AM
Paul
Drop me a PM here. I might be able to help you out.
Dave Mo…
Title: Re: WTB : OS Max 20FP w/muffler (ABN Version)
Post by: Paul Raley on June 09, 2025, 11:51:27 AM
Quote from: Dave Moritz on June 09, 2025, 10:46:47 AM
Paul
Drop me a PM here. I might be able to help you out.
Dave Mo…

PM sent!