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FOX .15 STUNT ENGINE

Old 06-02-2009, 01:17 AM
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Default FOX .15 STUNT ENGINE

Howdy all......I recently fired up an old bypass port .15, the one that looks like a baby brother to the Stunt .35.
I bought it 2nd hand 20 years ago.
What years were these made?
This engine has always served me well, runs great with a muffler... it pulls a British Diesel Warlord better than any PAW .15 could hope to do.
Old 06-02-2009, 06:54 AM
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Default RE: FOX .15 STUNT ENGINE



Ye gads man, I'm not sure when they were actually being made but I've got several still in use from theearly 1970's and they still run GREAT!!! I'm not sure that they can actually ever be "broken" - they just seem to go on forever and ever.

Enjoy yours!

Dave</p>
Old 06-02-2009, 10:38 AM
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Default RE: FOX .15 STUNT ENGINE

Thanks, Dave! That gives me some idea of how old it is. I stumbled on [IIRC] Preston Brigg's website about C/L combat and there was a complete listing of every FOX Combat Special ever made since 1957. He included some side notes about other engines, too......but didn't mention the .15. Somewhere, someone has a complete list of every engine they ever made including all the revisions?

The engine I have has been in the same state of "wornoutness" since I got it, but it still empties out a 2 oz tank every flight.
Old 06-02-2009, 12:17 PM
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Default RE: FOX .15 STUNT ENGINE

<div id="msg_113480" class="post">Peter Chinn "Latest Engine News",Model Aircraft (British) June 1962. discusses the Fox 15X  and 15XX.  These are later models which look sort of like a Stunt 35. The 15X on 20% nitro turned Tornado 8 x 4 at 11,600 RPM, The 15XX turned 12,800. I don't know about modern 15 glows, but Ron Warring, "Engine Analysis", Aeromodeller Jan. 1962 gives figures for the short-lived TD 15 of between 15,200 - 16,000 on 20% nitro.  A TD 09, way overpropped, on 30% nitro, will turn an 8 x 4 at 13,200.  A Medallion 09 is about the same as the two models Fox 15 with an 8 x 4.</div>
I had posted this on anoher forum. 
Old 06-02-2009, 12:39 PM
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Default RE: FOX .15 STUNT ENGINE

Jim, thanks for the info! This one doesn't have an X stamped on it, but it looks very similar to the .35 Stunt. I haven't tached this one, it's too worn out to fool around with different props, it likes the "white trash" Tornado 7x6 and that's about it.
This would make a doable engine project someday [for someone like me with more patience than skill], to cut out a new piston for a re-honed liner.
Old 06-02-2009, 01:17 PM
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Default RE: FOX .15 STUNT ENGINE

The first Fox 15 baffle I had was a "learning experience..." That was the first run of them in the mid/late 1950's, which had a finned, steel sleeve. Some, so I'd heard, ran well. Not enough, apparently as Fox changed to the die-cast , full-height crankcase with drop-in steel sleeve around early 1960s? Better, but not always, or for everyone. I've had a few that did quite well, if you allow for what they actually can do. Still considering one for a friend's current project...

Surprised to hear it tows a Warlord better than a PAW15! ...ANY PAW .15??? Hmmm...

I seem to recall that my better ones like 10%-15% nitro, and 25% castor, on a light, clean 8-4 wood prop. Flight setting in steady-2-cycle, backed off just a bit from peak.

The X and XX models were different from the main production version. I regret that the 2.5cc/.15 cu in size didn't catch on here as a sport engine size. Goodyear Racing and (in the USA) relatively few FAI Combat fliers wanted lotsa lotsa power.
Old 06-02-2009, 02:08 PM
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Default RE: FOX .15 STUNT ENGINE

Hi Lou, thanks for some more history! Mid 50's, I was just an embryo....

My PAW .15s are pretty representative of the gene pool....up until a few years ago I flew Diesel Bat with about a dozen other regulars during breaks in the glow combat schedule. Lots of fun and low maintenance. We allowed only nylon 8x6s and the planes were clocked for 65 mph [about 2 mph above stall speed].

Your recollections of .15 glow flight with a 8x4 have got me thinking about building a little stunter......thanks a lot, now I've got to finish 4 other projects and hose out the workshop!
Old 06-02-2009, 03:51 PM
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Default RE: FOX .15 STUNT ENGINE

CP, good choice!
Ringmaster Jr., Flite Streak Jr. Both a good choice or you can have what is behind curtain three:
http://www.sigmfg.com/cgi-bin/dpsmar...trol_20Line_01

Robert
Old 06-02-2009, 06:37 PM
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Default RE: FOX .15 STUNT ENGINE

Robert, thanks for showing me the Akromaster.....hard to believe $25 is the actual price? Minimum orders for shipping discounts must be the catch? I'll have to look into it, never ordered a kit from Sig before, just wood.
Old 06-02-2009, 08:27 PM
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Default RE: FOX .15 STUNT ENGINE

Actually they are very decent to deal with and the have some great deals on thier 1/2A kits too!
http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig

Dollar for dollar I don't think you can beat the price of the Staggerwing Beechcraft. The decals have metalflake in them! Really cool!

Robert
Old 06-03-2009, 09:59 PM
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Default RE: FOX .15 STUNT ENGINE

The "Steelfin" Fox .15 came out in 1958. The next generation was the .15X which has a drop-in liner. This was released in 1960 if I remember correctly. I think the XX was like the X except it had a better bronze for the shaftbearing. There was also a special XXX.

The X went through several iterations. The one in the lower left is the first X, note that it has no muffler provisions. The others shown mount the muffler with over/under screws. I also have one on an Akromaster that has muffler ears on the sides of the stack.

Note that the steelfins have no provisions for muffler. The one with the "square" fins is the first version.

George
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Old 06-16-2024, 07:48 AM
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Default Newly acquired Fox .15

Originally Posted by gcb
The "Steelfin" Fox .15 came out in 1958. The next generation was the .15X which has a drop-in liner. This was released in 1960 if I remember correctly. I think the XX was like the X except it had a better bronze for the shaftbearing. There was also a special XXX.

The X went through several iterations. The one in the lower left is the first X, note that it has no muffler provisions. The others shown mount the muffler with over/under screws. I also have one on an Akromaster that has muffler ears on the sides of the stack.

Note that the steelfins have no provisions for muffler. The one with the "square" fins is the first version.

George
  • I realize this is an older conversation article on a Fox.15, but I still have questions not answered in the blog. What fuel ratio do these use, is it the same as a Fox35? Where does one obtain gaskets? Is a gasket between the cylinder and crankcase necessary? I hope someone still reads these.
  • Al
Old 06-18-2024, 05:12 PM
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For more information on the Fox .15 (parts and manuals), see the following link: FOX 15x R/C & U/C

They do not appear to state what % oil to use in those manuals, but they do mention what fuel it runs best on. Knowing that, you can get more info on the fuels here: Fox and K&B Fuels
Old 07-03-2024, 11:21 AM
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Interesting reading, I fly with the Fox line, but my smallest is the Fox 19. Biggest is the Fox 59. I use 26 % Caster and 5% Nitro. All my flyers are 35 Stunt power. Old NVA system, they all leak so I apply fuel lube on the threads. It controls it. Will not totally stop the leakage, like the 4/2/4 break. Really been hot so far, going to be a hot summer!AJ
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Old 07-04-2024, 06:34 AM
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Check out this URL to Sceptreflight engine reviews. It has engine reviews for 12 various Fox 15's. Perhaps you can match yours up to one of these. The fact that yours has a muffler would suggest a late 1970's if the muffler is original. Mufflers were not standard in the 1960's. The Fox 15's can last a really long time if run on high castor oil content fuel.

https://sceptreflight.com/Model%20En...sts/Index.html
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Old 07-04-2024, 08:05 AM
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Default Fox 15

Thank you very much for the link

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