I have been tinkering with a 15X from Ebay and have been running it on the stand I have run about 8 2oz. tanks through it and it seems to be just about broken in now. It is an early one without any muffler provisions it was castored up tight when it came and cleaned up well but I dont think it was run much. I have a long Idle bar plug in it with a stack of gaskets to keep it away from the piston, not an ideal set up for sure but I dont have any short plugs on hand that have any life left in them, and I am just trying to finish breaking it in and figure ouit some of its quirks. I am running 10% nitro 22%oil 50/50 mix with an 8x4 Master Airscrew prop and its a pretty good runner I have a Magnum 15 XLS muffler to adapt to it. I am going to cut a few different head gaskets for it get some Glow Devil short idle bar plugs for it and lap the back of the case a little bit as the sealing surface is a little sketchy looking and then I can start setting it up for the Akromaster. I want to have this plane all ready for the GSCB new Years day fun fly. I could run engines all day on the stand its a lot of fun I hope I can remember how to fly! T.J. 

Can't remember the figures, but the test in Model Aircraft wondered what was the purpose, and guessed it must be to make it "kid friendly" as you say. Otherwise it had no more power than an .09. Taking out the gasket improved matters no end.

TJ,

I've got a Fox 15 in an Akromaster and very happy with the combo.

I use 5%N & 20% Castor, it's very happy on that. Although I absolutely HATE the Fox NVA - What a piece of dogs do!

I wouldn't ever use an idle bar plug on any 15 I have, mines got an OS 6 in at present, but any medium/hot plug should give you good results.

Now get it out of the test stand and go fly it while it still has some use left in it.  

Greg

Had a little time today and ran the 15X again with a new GloDevil short plug in it and its ready for the plane now. I also ran my veco 19 which is going in a flite streak ARF , I put a GloDevil short R/C plug in it and ran a few tanks through it and am pretty happy with how it runs as soon as I get the muffler on it I will try it again and tweak it if neccisary and fly it. The Veco seems to be a strong runner and I can't wait to fly it.T.J.

I have a Fox 15x that I bought new back in the early 60's, and it still runs well. I flew mine in a Jr Ringmaster, and a Shark 15 for many flights. When I started flying control line again 18 years ago, I got the Shark out and flew it as it was the only control line plane I had left. It still ran very well and flew the plane just fine. Nice little engine.

I picked a small bottle of Castor oil up in the Walmart pharmacy  and added a little to bring my fuel up to around 28% for the Veco and 26% for the Fox, I can't believe anyone would take this stuff internally Yuk!

Just experimenting mixing it up by the tankful seeing how they run and what they like. The veco seemed to be running hot it liked the extra bit of oil closer to super fuel. Its a force of habit really, I grew up on a farm and still farm a little on the side. I mix up most of my pesticides and herbicides by volume of concentrate to water and it can make a big difference dollar wise if you are careful, to much and you are wasting money and not enough and you risk not getting a good kill and the bugs can build up a resistance to the chemical . The Fox just seemed to blow any more oil out the stack past 26% the Veco might be able to go down a little once I change the needle valve , it has some crash scars on it and might have a slight bend to it I am going to try an extra Super Tiger valve in it and see how it runs because it needles a little erratic and might be a touch lean from an air leak.