What is the difference in the power of an OS .25FP and an FX? is it relevant? I bought an engine on RCU classified and it showed a "stock "photo" of an FX but in the description the guy stated it was an FP..it was $35 so I'm guessing it will turn out to be the older FP...btw a .25 is BIG for me as I fly mostly 1/2-1A .049-.074....Rog

"Substantial" would be the answer.

The FP isn't as strong a motor in general terms, but...it's still a good motor, and is happy turning a bit more prop than one might ordinarily use on a motor this size.

The FX is a higher revving engine. Very popular for combat, etc.

I would ask Rog, you might score a decent deal on a used FX for $35. If its a FP it better be brand spankin new. I have an FX an think very highly of it. FP is what they had before LA.

Hey Vic, I had an FP .40 long ago and have an LA .40 now (flown once) and couldnt tell the difference between them,,tried to ask but the guy is out of town ..I got one .FP .25 for a spad and bought this one for my simple series ultimate bipe..haven't seen the card yet[8D]...Rog

I agree with Racecity.

While not as powerful as the FX, the .25FP is no slouch and is a good engine.

Rog, I have the .25FP and it is a very sweet engine. First flip starts are the norm. Get the fuel up to the carb, one turn choke (any more and it will flood), flip briskly a couple of times unchoked, then attach the battery and flip. Electric starters are completely superfluous for this engine. I fly a very old Skylark 56 on it. The plane weighs nearly 4 lbs and really moves out on it. In very good condition the engine's worth the $35.

The 25FX also has a good reputation for handling, but it is at least 2 oz. heavier and much more powerful.

Jim

Thanks fella's this is for a 33" ws bipe that is ~30 oz..it calls for a .10-.20 and recommends the GP .15....Rog

RaceCity what would you think the max prop is for the FP .25, thrust wise?...Rog

That's pretty much true for the entire FP line of engines.

ROG, regarding props, I had a .25 FP on a Sig Kadet Senorita and the prop I always kept coming back to was the APC 9x5.

Yeah I had a .40 FP back in the 90's and it was a nice engine..but my "trainers" were less than friendly so I got out of the hobby..then back in I traded it for an enya .15 ,no I dont know why..but I've had good luck with the LA too ..BLE thanks thats the prop that came with the engine I already have,,not sure if this other one will come with a prop or not..one .25 is for a spad the other is for my bipe...Rog

Rog,

Off subject, but is that Astroboy? If so, that brings back some memories....