hsukaria

Ok, I will be keeping a lookout for any sales of the Fox 15.

1QwkSport2.5r

I'd need to measure the wingspan to be sure. It's not a big plane despite being made by Norvel; though being a trainer, I'm surprised it came with an AME .061 in it. I do not know if the AME was stock or not. With the .061 in it, it flew like a dog rubbing it's butt on the ground. My buddy balanced it, but it flew around dragging its tail. When I put the .10 in it, I balanced it a little nose heavy in hopes it flies better.

Sport_Pilot

Ok the older version show up more often. They are not as powerful and carbs not as good. I think they had a .20 version of the same engine for a while.

sarpet

Ijust buy fox.15bb from ebay.

hsukaria

Is that the newer version?

sarpet

Idont know? Manual is printed 1992

Aaron L.

Yep that's the newer, schnuerle ported BB version. Damn good little engine.

hsukaria

Looks like it has an adapter with a non-Fox carb,

1QwkSport2.5r

Sure does.

Aaron L.

Nope. Original carburetor. I've seen a number of Sch. ported 15BB's with that same square carb.

1QwkSport2.5r

I ran the other Fox .50 that I picked up awhile ago. It's in much better mechanical condition than the first one I got, but it's not a barn burner. The .50 isn't all that great on small props anyway, but it ran 14k on a 10x6 MAS on 12% nitro 23% castor fuel. I didn't take a video of this one, but I'll make a video of it when I put the diesel head on it and run it on a 13x6 APC.

Aaron L.

That's the correct carb for that .15BB. Here's a couple pics of another engine with the same carb. It's basically a MK-X two needle style. Body looks different than the 'usual' MK-X, but it functions the same way. I've seen a number of .15BB's with this carb.

hsukaria

Ok, that carb does look original when you look closely up.

Charley

My Feedback: (2)

Too much oil, too small a prop. Duke marketed the .50 as putting out as much power as some contemporary .60s on the same props, 11x7 or 8, 12x6 or 7; they get it done there. Torque is the deal. I had three of them, sold one on a aerobatic sport model. I have one on a nice bipe, inverted. Pulls it around great on a 11x6 Zinger. Don't need speed, need thrust on that model. 18% oil is fine with some of it castor. Powermaster 10% nitro, 18% castor/syn mix works well.

CR

1QwkSport2.5r

Yup.

sarpet

What is fox missile mist fuel? Recommended for fox.15.
2h breaking in time,rear cover leaks,bolts loose ,itake thick paper gasget off and glued rear cover.
Fox short idlebar plug and j'en medium plugs tested.
Fuel 20%castor fox recommend ,10%nitro.
China apc 8x4 prop
+10°C
Only 14200rpm
Engine works very nice,easy start,runs good,short burst lean mixture only.

Mr Cox

The box looks like a slightly older version (my latest came in the black box with gold text) but the engine looks the same as the latest ones. There are a few odd things with these engines and they will not make the claimed 15000rpm (on an 8x4) straight from the box...

There are a few things to take a look at;
- muffler fit; the muffler on mine will to seal against the crank-case (the two mating surfaces will not reach each other) This can be ammended by placing a thick paper gasket inside the muffler flange.
- glow-plug length; on mine the OS#8 has the proper thread length while the Fox short reach plugs, are too short. (see picture below)
- Threaded prop-stud; on my engines the crank is threaded straight through(!) This give a potential leak, possible missalignment, and a very large void in front of the intake in the crank. (see picture below). The easies fix is to simply fill this void bit a bit of JB weld.

With these mods the engine will now approach 15000rpm on an APC 8x4, using 10% nitro and 20% all castor fuel.

Fox short reach plug:


OS #8 plug:


Front of crank (the picture doesn't quite make justice of the real extent of the void):

Hobbsy

My Feedback: (102)

Missile Mist is 25% nitro methane and 20% castor.

1QwkSport2.5r

I could never imagine using that much nitro in a Fox... I know many engines were setup for it (I have a small ABC .40 that has the high nitro head button), but wow... That little .15 ought to really sing on 25% nitro! :O

aspeed

On my .15, I made a fillet of solder to seal up where the drill broke through. My head insert was more of a bowl shape than a trumpet like yours. I made up another head button from an old #2 Rossi button and put in a turbo plug. It really woke it up on a 7-5" prop, outdoing many otherr .15s that I had checked at the time. When I went to fly it, there was a 7-6 prop on, and it preignited a lot, so I put the stock plug back on, and it works quite well with some good speed on my little Sig Wonder. I noticed the stock head button had .040" clearance, so I shaved off a bit to bring it a bit closer to the piston. Really it is the only Fox I really like. All my others are quite dated and slow. This one idles very low and transitions nicely like a larger motor. The Missle Mist fuel was pretty good stuff. It had some perfume in it, so it smelled nice. I think there was a Blast which had more nitro again. Back in the day nitro was big. Now all the events i go in are restricted to 10% (or zero for what I wannabe in)

Sport_Pilot

Older high performance Fox's do require lots of nitro. Older .15 require about 20 to 30% and newer about 15 to 20% depending on prop and altitude.

1QwkSport2.5r

I totally get that - that's why I said "I know many engines were designed for it", it's just a bit crazy to think it to be normal is all.

hsukaria

I always liked the name "Missile Mist", kind of catchy and original.

sarpet

Ihave to make missile mist and test it.
Today 14400rpm 10% nitro.

hsukaria

That is better than my old OS Max 20 ( bushing and strap-on muffler), 14000 rpm on 8x4 prop, 15% nitro.