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RE: Club FOX! - 4/9/2012 11:26 PM   
Scirocco14



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Status: offline 		Earlwb, what is that sport plane?  Looks like a fun one. 

And I'd love to get my hands on a Birdy 10 and build it w/ a Fox .15 on it!

Mark




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RE: Club FOX! - 4/9/2012 11:37 PM   
earlwb


 

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Status: offline 		I think it is more or less a copy of the Herr Mini_Sport RC plane. It was supposed to be electric powered. But I stuck on a glow engine of course.
Someone sells them on Ebay as a ARF Mini Sportster.
Like this one for example http://www.ebay.com/itm/New-Electric-Mini-Sportster-Airplane-RC-Sports-Plane-ARF-Kit-/110857830344?pt=Radio_Control_Vehicles&hash=item19cfa43fc8
It won't taxi at our grass flying field but with larger diameter wheels it will ROG no problem.
It does great four point rolls and knife edges too.




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RE: Club FOX! - 4/10/2012 12:21 AM   
turbo.gst


 

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Status: offline 		The Fox .15 is a jewel! I have both the bushed and BB versions.

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RE: Club FOX! - 4/10/2012 3:30 AM  1 votes
earlwb


 

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Status: offline 		Cougar429,
   Another idea...
   I forgot about it but some guys actually mounted the VP30 fuel pump inside of the backplate. You drill a hole just big enough for a screw to screwed into the threaded hole after you remove the pressure fitting for the pump. the screw keeps the hole open when you glue it in place (lightly oil the screw to ensure the epoxy won't stick to it). You then glue the pump in with JB Weld or Machinist's epoxy. You can put down some epoxy and then insert the pump and screw it down with the screw. After the epoxy has cured you remove the screw and now you are in business. Oh yeah point the adjusting screw and the inlet and outlet lines like you want too.  Now with the newer Eagle IV engines that pressure fitting boss on the backplate is likely in the way, so you would have to remove it, if you go this route.



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RE: Club FOX! - 4/10/2012 4:38 AM   
Cougar429


 

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Status: offline 		Found out the only spare fuel fitting was M4 X 0.7, so drilled it out part way with a #30 drill and tapped it. The raised boss has more than enough meat for that. Final drill through was a 1/64, so the hole into the case is relatively small. Did the Loctite and letting it sit till tomorrow. Don't have a test stand, so will have to wait till at least this weekend to fire it up again. With the work shifts this would likely happen anyway.

You guys seem to have lots of fun with those smaller engines and love the tales of difficulty identifying make and size. I've always said Fox was underrated.

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RE: Club FOX! - 4/11/2012 2:29 AM   
earlwb


 

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Status: offline 		Sounds good. But I think the hole needs to be larger than 1/64 of a inch or .015 inches. You want a good strong pulse going to and from the pump diaphragm in order to get it to flex in and out. The small hole would tend to act more restrictive and prevent the pulses from flowing easily.


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RE: Club FOX! - 4/11/2012 4:03 AM   
Cougar429


 

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Status: offline 		Well, no problem to drill it out larger. I can run the same I.D. as the fitting.

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RE: Club FOX! - 4/12/2012 2:38 PM   
hsukaria


 

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quote:

ORIGINAL: Scirocco14

Earlwb, what is that sport plane?  Looks like a fun one. 

And I'd love to get my hands on a Birdy 10 and build it w/ a Fox .15 on it!

Mark



http://www.valuehobby.com/airplanes.html?cat=185

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RE: Club FOX! - 4/12/2012 3:46 PM   
codycarlisle25


 

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Status: offline 		Ok guys we all like our Fox Engines, but which one is your favorite?

Mine is my Fox .50

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RE: Club FOX! - 4/12/2012 3:52 PM   
fujiman


 

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Status: offline 		HAWK .60........I HAVE SEVERAL!!!!!!!!

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RE: Club FOX! - 4/12/2012 4:24 PM  1 votes
earlwb


 

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Status: offline 		I like the HAwk .60 too. I have a few of them too. This was my primary pattern plane engine years ago. The ones I used took seemingly forever to break in, but after that they were real powehouses. They are smaller than the big case modern .60 engines and a little taller than the bored out .50 size engines. I have seriously considered running one in a Jackal plane for the heck of it. Fox claims they can turn 22,000 RPMs all day long no problem. I never had one turn over 20,000 RPMs on the ground myself. My tach only worked up to maybe 20,000 RPMs at the time I did it. But the prop was too small for the Delta plane I had it on. If I remember correctly,  I was running a 10x8 prop when I was flying the delta plane or was it a 9x8, I forget know.


Testing out one that I rebuilt a couple of years ago.







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RE: Club FOX! - 4/12/2012 4:30 PM   
Cougar429


 

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Status: offline 		I guess it would have to be my first, the indestructible 50BB. Along with the 40's and new 60 have another 50 that needs a run up.

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RE: Club FOX! - 4/12/2012 5:27 PM   
fujiman


 

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Status: offline 		i ran my Hawk .60 on a hobby shack pilot EZ .40 fw-190 with retracts. excellent combo, lots of vertical, very fast. as i remember my hawk run good pretty much rite from the get go. i ran a perry carb. with no problems!!!!!!! loved the plane, ran it into the ground at flat out speed flying just too low. but dang it just looked so good there, gear up and all!!!!!!

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RE: Club FOX! - 4/12/2012 5:56 PM   
turbo.gst


 

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Status: offline 		Mine would have to be my Fox Eagle IV 74. Although the talk of the Hawk has my curiousity peaked about my NIB Hawk 60. Shoot, I can't have just one favorite engine anyway!

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RE: Club FOX! - 4/12/2012 6:18 PM   
fujiman


 

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Status: offline 		the hawk was one of the top engines fox made. just my two cents worth!!!!!!

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RE: Club FOX! - 4/12/2012 7:25 PM   
landeck


 

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Status: offline 		My favorite RC engine is the Fox .74 Eagle IV with the new carb. Of course, I do love my Fox .60 Eagle I which I have been running since 1973. My favorite CL engine is the Fox .15. The two I have have run forever.

Bruce

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RE: Club FOX! - 4/12/2012 7:31 PM  1 votes
earlwb


 

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Status: offline 		The Fox Hawk .60 engine used a special finned steel cylinder sleeve that was specially hardened giving it extremely long wearing characteristics. Plus there was no resistance to the heat as it was transferred out to the cooling fins, so the cylinder sleeve was quite resistant to distortion from the heat as it was running. Barring a mishap, the cylinder is usually good for two or three ring replacements and even a new piston if need be, as it wears faster than the cylinder does. The cylinder sleeve doesn't scratch easily either.  There were some numbers posted someplace about how hard the cylinder sleeve was too. But I forget where, it might be buried in this thread someplace.

Of course parts are harder to come by now. Fox has run out of the special Hawk .60 parts now. But it is easy to get bearings for them and Frank Bowman makes good piston rings for them. One could use the new Fox carb on them too.

Actually come to think of it, most all of the Fox engines run really good and are long lasting. So technically they all tend to be a favorite of mine.


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RE: Club FOX! - 4/12/2012 7:35 PM   
Sport_Pilot



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Status: offline 		Fox .50.  I have a Fox Eagle .60 that had poor idle and transition with the Perry carb it cam with, but it runs fine on a MK-X carb, but have never flown it that way.  The Fox .50 is getting worn but still runs great.

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RE: Club FOX! - 4/12/2012 11:13 PM   
hsukaria


 

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Status: offline 		So what were the reasons for Fox to replace the Hawk with the Eagle engines? Cheaper? Easier to use/break-in? etc...?

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RE: Club FOX! - 4/13/2012 12:15 AM   
carddfann


 

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Status: offline 		I recently bought a brand new Hawk minus the box. Never been ran except at Fox and it has the muffler. Its their later one that has the dull colored case. I can't wait to put it in my Aeromaster Too. What a classic combo!

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RE: Club FOX! - 4/13/2012 12:47 AM   
fujiman


 

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quote:

ORIGINAL: hsukaria

So what were the reasons for Fox to replace the Hawk with the Eagle engines? Cheaper? Easier to use/break-in? etc...?



I DON'T KNOW!!!!!!! but i wish they would start up product of it again!!!!!!!!!

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RE: Club FOX! - 4/13/2012 1:15 AM   
hsukaria


 

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quote:

ORIGINAL: fujiman


quote:

ORIGINAL: hsukaria

So what were the reasons for Fox to replace the Hawk with the Eagle engines? Cheaper? Easier to use/break-in? etc...?



I DON'T KNOW!!!!!!! but i wish they would start up product of it again!!!!!!!!!

I would buy one for sure, especially with their new carb.

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RE: Club FOX! - 4/13/2012 2:08 AM   
carddfann


 

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Status: offline 		I'm not sure why they came out with the Eagle series, but I have an old Sig catalog with the nice full color Fox section and it shows the 60 twin, hawk, old Duke 60, and Eagle. I think they said or infer that the Eagle was the start of a more powerful line of 60's, but basically said that the hawk was still powerful, debugged, and a good value compared to the more expensive eagles. I think Fox wanted a new generation to go more head to head with the Rossi's, Webra's, and forget that other imported high performance engine at the time. I think its name had only 3 letters in it but I'm drawing a blank. It sucks getting older.

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RE: Club FOX! - 4/13/2012 2:41 AM  1 votes
earlwb


 

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Status: offline 		As I was told Duke said that the move to the Eagle II was driven by cost. Both machine time and material cost. Duke couldn't get thick walled tubing material for the Hawk so he machined the cylinder from solid "Rod" stock, this was expensive. The Eagle's cylinder could be made from tubing this saved a lot in machine time and material costs. At this time electron beam welding had been perfected. This allowed Duke to make his crankshafts from three pieces that he was then able to electron beam weld together. Even though he had to send out the cranks to be welded the cost savings in material and even the machine time to rough out the cranks from solid bar was worth it. (I never heard of a Fox Eagle II, III or IV crank breaking at any of these welds).

Now Duke's actions weren't  totally driven by cost. The Eagle II and III were built with 3 piece cases this allowed Duke the flexibility to make his 120 twin from the same basic modules. The 3 piece case had matched front and rear housing with precision bolts bolt holes that were match machined. Once the life of the 120 had come to an end there was no need for this time consuming machining operation. This is where the 2 piece Eagle IV came from and it's great 17mm crankshaft. The 120 was a failure in the market place because of the uneven cylinder charging from the crank pin's action against the transfer ports. A rear exhaust Fox 120 is a very powerful and reliable twin!


Hey cardfan, the big time pattern .60 engines were OPS, Rossi, Webra, HP,  and OS. Fox was sort of a left out child for odd reasons. When i was pattern flying I was the only one using Fox engines everywhere I went. But earlier the Fox .60 Blue Head engines were quite popular until the planes needed retracts and more speed.



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RE: Club FOX! - 4/13/2012 3:22 AM   
hsukaria


 

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Status: offline 		So, by saying that the Eagle had more power, yet the Hawk could turn a lot higher RPM's, would that mean that the Eagle can turn a bigger prop due to higher torque?

Anyway, the Eagles are good about being able to set them as rear exhaust. But how much power, if any, is lost if the exhaust is set to the rear?

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