Crazy4Flight

My Feedback: (540)

FOX 50 runs HOT is this normal ???
older engine: 7-10 years old sitting long time on Pheaton biplane

mixture setting has no effect on how hot it runs
fuel 10% or 15% omega (koolpower) no difference.

GoMike

Crazy, this engine runs best on low to no nitro because of its head button design and high compression. I experienced something like you did with the high-speed adjustment. My needle valve had become very loose in the nozzle it screws into, allowing a lot of air to enter and creating a lean mixture no matter how much I turned the needle. I solved the problem with a little teflon tape on the needle.

Good luck with it,

==Mike==

splatt

green cool power has no castor, castor good for Foxs. Castor carries heat out the tail pipe. Need castor in your mix.

submikester

My Feedback: (6)

Whoooohooohoooo man.

Please - not so much nitro in this engine. They are designed well to run on 0 nitro quite well. The most I would run is 5% in a cool climate. I've had two and they did run warm compared to my other engines. I had them in Sig Kougars with tuned pipes back when they were still making these bad boys.

I'd love to have another but I would have to carry a whole other can of fuel with me. I like having engines that all run on the same %.

Mike 1

My Feedback: (9)

Yup,
Duke designed all his engines to love castor.
Put some castor in that puppy.
At least 20%
Mike

RaceCity

DUKE! DUKE! DUKE!

YES to what all the others have said. Drop the nitro to 5%, use lots of castor, stir well and hang on.

If available in your area, SIG "Champion 5" or PowerMaster GMA 5/22 are great fuels for this motor.

Heaven forbid Duke ever found out you ran cruelpower fuel in that motor. (shiver.....)

Long Live Fox!


'Race

Rodney

As stated above, low nitro and all castor for best results.

RaceCity

Yeah! Like Rodney said....

I meant to say that the fliteline solutions website is a goldmine of tidbits for us FOX lovers..

www.flitelinesolutions.com

(I think I got that right)

'Race



"To Fox...or not to Fox.....that is the question"


SAY NO TO CHINA!

Flyboy Dave

My Feedback: (21)

Run it on green Cool Power 15% nitro.....yes, synthetic oils are good.

Your Fox engine will last about 30 seconds on this wonderful fuel.

FBD.

Sport_Pilot

Thought the low nitro engines were only the .60 and up Eagle II through IV's? I have a Fox .50 that I have yet to run on a plane, but it ran fine on .15%. I would guess it was running lean, not enough oil (especially castor oil), or too much prop. Have a Fox Eagle I and a Fox .15 and they like nitro.

It doesn't need gob's of castor like my Fox Stunt .35 or even the Fox .15. It should run fine on Omega 10 or 15%. This is not a bronze bushed lapped iron engine, its oil requirements is not that different than other ringed engines, once it is broken in. Which make's me recall anothe possiblilty, some Fox engines are stubborn to break in. I know it is old, but how long did it run before sitting around a long time?

rambler53

My Feedback: (494)

I've run 28% oil in my engines before the ABC and Nickel stuff of new, size in this case doesn't matter, even an .09 would want more oil. What prop are you turning?

Sport_Pilot

The .50 turned a 11-6 at over 12.5K as I recall. This is a BB ringed engine. The .15 is a BB lapped iron piston, it needs 100% castor.

rambler53

My Feedback: (494)

You'll want 28% castor, and the rest alcohol, non-synthetic fuel is what I assume you mean about 100% castor. I dumped all my iron piston engines because of the hassle and was able to afford some nice FX and 4 stroke engines in their place. I have a few SuperTigres left just because they aren't ugly and slow like Fox engines.

Hobbsy

My Feedback: (102)

To say Fox engines are slow is to say you've never actually run one.

RaceCity

No kidding...

Fox didn't make slow motors. Well...the .35 c/l motor, but that was supposed to run slow.

Methinks 28% oil is a little excessive for routine use in an r/c motor. If you keep removing the "fuel" and replacing it
with oil....things are bound to start slowing down for you.

'Race

Hobbsy

My Feedback: (102)

FOX 50 runs HOT We're talking about a .50.

rambler53

My Feedback: (494)

I'm sorry I commented. I've run dozens of Fox engines in the 70s only because they had the lowest sticker price in it's day. They were mostly dogs. I never ran a .50, didn't want to. I had enough. They are heavy, ugly, convoluted to tune, and why have unpleasant experiences in the hobby more than necessary? I switched. Thanks. The Castor content is a proven practice among competent fuel mixers of vintage engines abroad, not favorable to the keyboard experts that never tried? Thanks for your edit, but 28% works.

Finally, a .35 C/L or a .50, or any other displacement, WILL have heat problems with Cool Power in a vintage application, if it doesn't just sieze up first. Heat in a two stroke could be other things, but from cyber space, the comment on fuel used stood out to many as a problem, and it is. Correcting that first allows one problem to be resolved so further test and troubleshooting can be done. At least it's not stalling.

I've owned and have run hundreds of engines. Most I've kept over 30 years, and I eliminated every Fox I've ever bought, with a smile. Today people will spent $60 on a OS LA .40 engine, with cheap features as a bushing crank, plastic remote needle valve, and fly something even slower than a Fox. So from that perspective, yes, the Fox has power. But some of us fly SX .50s, Super Tigre .51s, and even Magnum .52 engines and never come second to a Fox .50. In fact, they are a lap ahead. Aside from smaller displacements, Fox hasn't even been in Towers stock, because it's crapola.

rambler53

My Feedback: (494)

Crazy4Flight disappeared from this post, guess the better fuels worked.

Flyboy Dave

My Feedback: (21)

krosypal ,

..... I agree with your comments about Fox engines. Aside from a few contest
engines that ran well....the other 95% were junk, and wouldn't have made
decent fishing sinkers....IMO. You cannot even compare them to the fine
Italian and Japanese, Austrian and other engines over the years.

My first r/c engine was a Fox .35RC....I couldn't get rid of that junk fast enough.
Most of the old glow engines, and ALL of the old racing glow engines ran fine on
25% castor oil.....that was the only thing keeping them together. None of those
old engines would last a minute on Cruel Power Green Engine Destroyer.

Race' and Hobbsy have good things to say about the Foxes....I'm sorry, I don't. []

FBD.

Crazy4Flight

My Feedback: (540)

about the FOX 50...I dont have it in hand cannot say what prop is on it. or what fuel was run in it. Have not made contact with my friend who has it now., to inquire exactly which fuel was used

rambler53

My Feedback: (494)

Try a SX .50 then and be happy. You can pass it down to your kids too.

Crazy4Flight

My Feedback: (540)

I have a OS .50SX in a tequila sunrise runs great but not as expected,
but the ST.51 would take the same plane knife edge loop...
and my Dubb Jetts speak for themselves

rambler53

My Feedback: (494)

Hmm, what age is the .51 ST? New?

submikester

My Feedback: (6)

Well, the only Fox I owned was the 50 and I had two of them. They ran like dreams pulling nicely with a 3 blade 10x7.5 prop. I flew them on Sig Kougars with tuned pipes. I was no master tuner back then (or now really) but had no trouble with them. Low nitro, average plug heat in the palm springs desert.

They were great; I would buy another if I hadn't moved on to mostly 4 strokes (though I am building another Kougar right now).

Crazy4Flight

My Feedback: (540)

the ST.51 is at least 6 years old but has a new ring in it
Tequila Sunrise #1 died due to windshear
Tequila Sunrise #2 has the OS .50 SX
ST.51 is now on my girlfrinds trainer ( dumped that wimpy .40LA)

new toy is pictured