Fox Eagle IV .74
02-21-2010 | 08:55 PM
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From: Mission,
TX
Fox Eagle IV .74
I have two Fox .74's with relatively low time and both
run in open cowled planes on the same fuel and one
over heats no matter how rich it is set it seems to
have an eight minute limit even if most of the flight
is at low speed. Good idle and transition and first
flip start.Bearings are good and so far I cannot find
a leak. Today I sent it off so rich it smoked and four
cycled on 20% castor fuel, no change. Dead stick on
a low downwind pass.[
]
Ralph
run in open cowled planes on the same fuel and one
over heats no matter how rich it is set it seems to
have an eight minute limit even if most of the flight
is at low speed. Good idle and transition and first
flip start.Bearings are good and so far I cannot find
a leak. Today I sent it off so rich it smoked and four
cycled on 20% castor fuel, no change. Dead stick on
a low downwind pass.[
]Ralph
02-21-2010 | 09:55 PM
#2
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RE: Fox Eagle IV .74
Try running low nitro fuel. It will run just fine on 0% or 5%. Plus you'll get better fuel economy on cheaper fuel.
I usually take 15% for my combat planes and 0% for my Foxes. When I mix them up the .74 becomes very tempermental.
If you have the EZ, air bleed carb, look in this thread, post 545
[link=http://www.rcuniverse.com/forum/m_3354294/anchors_8933919/mpage_22/key_/anchor/tm.htm#8933919]Club Fox Thread[/link]
THis carb modification worked for my 74. The EZ carb tends to lean out in the mid-range then overheat.
The was an informative site that has since gone down called flitelinesolutions.com. I copied some of it to my clubs webpage at [link=http://www.fayettevillercclub.com]www.fayettevillercclub.com[/link]
Navigate to the Fox Engines page and the fix is detailed there. Let us know if it works for you.
I usually take 15% for my combat planes and 0% for my Foxes. When I mix them up the .74 becomes very tempermental.
If you have the EZ, air bleed carb, look in this thread, post 545
[link=http://www.rcuniverse.com/forum/m_3354294/anchors_8933919/mpage_22/key_/anchor/tm.htm#8933919]Club Fox Thread[/link]
THis carb modification worked for my 74. The EZ carb tends to lean out in the mid-range then overheat.
The was an informative site that has since gone down called flitelinesolutions.com. I copied some of it to my clubs webpage at [link=http://www.fayettevillercclub.com]www.fayettevillercclub.com[/link]
Navigate to the Fox Engines page and the fix is detailed there. Let us know if it works for you.
02-21-2010 | 10:02 PM
#3
RE: Fox Eagle IV .74
The compression on these engines is real high. They will run real hot as a result. http://web.archive.org/web/200505061.../project5.html
02-22-2010 | 01:02 AM
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RE: Fox Eagle IV .74
Thanks guys. It needs 5% to keep a reliable idle setting
so that's all I use. I believe you are right about the
compression being too high. Maybe a couple more
shims are in order.
so that's all I use. I believe you are right about the
compression being too high. Maybe a couple more
shims are in order.
02-25-2010 | 02:31 PM
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From: Comox, BC, CANADA
RE: Fox Eagle IV .74
The complete archived Fliteline Solutions website is available again at: http://www.mediatek.ca/fox/
Hope this will be of some use to Fox engines fans.
Regards,
George R.
Former webmaster of the original Fliteline Solutions website.
Hope this will be of some use to Fox engines fans.
Regards,
George R.
Former webmaster of the original Fliteline Solutions website.
02-26-2010 | 10:51 PM
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RE: Fox Eagle IV .74
George , Thanks for the new link. I believe the head button or my fuel
is the problem. I know that A.J. is a talent but did not know about the
head button from him. I broke this engine in with FAI fuel but went to
10% because of transition problems. After two gallons of that it blew a
hole in the piston. I'll go back to FAI and see how it does now.
Ralph
is the problem. I know that A.J. is a talent but did not know about the
head button from him. I broke this engine in with FAI fuel but went to
10% because of transition problems. After two gallons of that it blew a
hole in the piston. I'll go back to FAI and see how it does now.
Ralph
02-27-2010 | 09:04 AM
#9
RE: Fox Eagle IV .74
This engine will detonate if you use nitro. When Duke designed this engine during the time when nitromethane was getting expensive, he meant it to be run on Zero nitro. That was his sales pitch. If you were having trouble with transition it was the needle settings. The carb on these are finiky at best and there is a mod to do on the needles which involves modifying the point to help on transition. During this time frame Duke was even recasting heads on the .19,.25 engines to boost compression, allowing the use of Zero nitro.
02-27-2010 | 10:37 AM
#10
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RE: Fox Eagle IV .74
I have a NIB .74 I was given in about '93 that I've never run and will find it's way into an RC market place soon as I find the barrel/idle stop screw I removed for some reason, I think I borrowed it for a long-since-gone Fox .15. Of all the stuff I rooted through recently, that was the 1st and easiest choice for my "auction site" bin. I wouldn't waste 10 minutes on it myself. Years ago I bought a Fox .15BB RC and an OS .15 FP at roughly the same time. I gave away the Fox shortly after, and I still have the FP and it runs like a top and doesn't act up when I wear the wrong colour shirt to the field. Finicky carbs, overboard compression, metallurgy that threatens to lock up if you don't run equal parts of castor oil, maiden's tears and methanol.. [comments deleted in good taste]. Sorry if I offend Fox fans, I know they made a few engines that worked. 
MJD
MJD
02-27-2010 | 05:17 PM
#12
RE: Fox Eagle IV .74
Two thumbs up Hobbsy. I never met any Fox engine that I couldn't get to run better than or outlast an OS
I own Fox engines as old as 45 years old and they still run flawlessly.
I own Fox engines as old as 45 years old and they still run flawlessly.
02-27-2010 | 05:36 PM
#13
RE: Fox Eagle IV .74
Fox engines aren't for everyone, but when you do figure them out, and have them running good, they tend to outlast everything else except for Enya engines.
I am still flying a few airplanes with FOX engines on them. A 24 year old 40 size low wing plane with a FOX 45 on it. It is due to be installed on a new plane as that old plane is getting pretty worn out now. One of my 15's is on a new 15 size sport 3D plane. It has been on two different airplanes since I first got it like 20 years ago. I have a old Eagle 60 baffle port engine on a new Extra 500 scale plane. It still runs good too. My 74 was on a Japanese Zero that died years ago, I need to stick it on the front of something again. I happen to have old FOX 36 RC currently on a foamie Cessna 172 that is still going strong. It just won't wear out.
I am still flying a few airplanes with FOX engines on them. A 24 year old 40 size low wing plane with a FOX 45 on it. It is due to be installed on a new plane as that old plane is getting pretty worn out now. One of my 15's is on a new 15 size sport 3D plane. It has been on two different airplanes since I first got it like 20 years ago. I have a old Eagle 60 baffle port engine on a new Extra 500 scale plane. It still runs good too. My 74 was on a Japanese Zero that died years ago, I need to stick it on the front of something again. I happen to have old FOX 36 RC currently on a foamie Cessna 172 that is still going strong. It just won't wear out.
02-27-2010 | 09:29 PM
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From: Mission,
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RE: Fox Eagle IV .74
Call it stubborn but we will work it out. Going on sixty
years of flying Fox engines and I have broken a few.
This one is a bit of a head scratcher but it too will be
sorted out eventually. The twin to it,once broken in, is
fine.
years of flying Fox engines and I have broken a few.
This one is a bit of a head scratcher but it too will be
sorted out eventually. The twin to it,once broken in, is
fine.
02-28-2010 | 01:38 AM
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AL
RE: Fox Eagle IV .74
ORIGINAL: controlliner
Two thumbs up Hobbsy. I never met any Fox engine that I couldn't get to run better than or outlast an OS I own Fox engines as old as 45 years old and they still run flawlessly.
Two thumbs up Hobbsy. I never met any Fox engine that I couldn't get to run better than or outlast an OS
I own Fox engines as old as 45 years old and they still run flawlessly.
I agree. I recently lost almost all of my engines in a fire, but of the couple hundred of them among the best were Foxes. I had OS FSR, FP, and LA 15s, but the Fox BB 15 was easily the best. Good enough that I bought three of them. I have always thought that OS engines were hard to beat for being user friendly, but the Fox 74 I purchased a couple of years ago was as easy to run as anything I had. (possible exception being my old OS 1.08 FSR which, fortunately was stored separately from the other stuff).
jess
02-28-2010 | 11:02 AM
#16
RE: Fox Eagle IV .74
I went to the WRAM show last weekend. Fox was there and I spoke with them. They say that Fox will be replacing the EZ Carb on their 60s and 74s with their new twin needle carb. The new carb has an unusual looking knurled knob and an internal O ring(s). Hope it works well. I see a 74 in my future.
02-28-2010 | 12:59 PM
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RE: Fox Eagle IV .74
ORIGINAL: JPMacG
I went to the WRAM show last weekend. Fox was there and I spoke with them. They say that Fox will be replacing the EZ Carb on their 60s and 74s with their new twin needle carb. The new carb has an unusual looking knurled knob and an internal O ring(s). Hope it works well. I see a 74 in my future.
I went to the WRAM show last weekend. Fox was there and I spoke with them. They say that Fox will be replacing the EZ Carb on their 60s and 74s with their new twin needle carb. The new carb has an unusual looking knurled knob and an internal O ring(s). Hope it works well. I see a 74 in my future.
Now, if they would just bump the .74 up to a .91...
Ed Cregger
02-28-2010 | 05:36 PM
#18
RE: Fox Eagle IV .74
I really like my Fox 74. Takes a long time to break-in, but makes awesome power. My Fox 15's are fantastic little engines. I'm curious to watch the new offerings from Fox Glow Engines.
turbo
turbo
02-28-2010 | 08:17 PM
#19
My Feedback: (6)
RE: Fox Eagle IV .74
ORIGINAL: NM2K
Now, if they would just bump the .74 up to a .91...
Ed Cregger
ORIGINAL: JPMacG
I went to the WRAM show last weekend. Fox was there and I spoke with them. They say that Fox will be replacing the EZ Carb on their 60s and 74s with their new twin needle carb. The new carb has an unusual looking knurled knob and an internal O ring(s). Hope it works well. I see a 74 in my future.
I went to the WRAM show last weekend. Fox was there and I spoke with them. They say that Fox will be replacing the EZ Carb on their 60s and 74s with their new twin needle carb. The new carb has an unusual looking knurled knob and an internal O ring(s). Hope it works well. I see a 74 in my future.
Now, if they would just bump the .74 up to a .91...
Ed Cregger
I'd purchase a 90 straight away
03-01-2010 | 07:47 AM
#21
RE: Fox Eagle IV .74
ORIGINAL: MJD
I have a NIB .74 I was given in about '93 that I've never run and will find it's way into an RC market place soon as I find the barrel/idle stop screw I removed for some reason, I think I borrowed it for a long-since-gone Fox .15. Of all the stuff I rooted through recently, that was the 1st and easiest choice for my ''auction site'' bin. I wouldn't waste 10 minutes on it myself. Years ago I bought a Fox .15BB RC and an OS .15 FP at roughly the same time. I gave away the Fox shortly after, and I still have the FP and it runs like a top and doesn't act up when I wear the wrong colour shirt to the field. Finicky carbs, overboard compression, metallurgy that threatens to lock up if you don't run equal parts of castor oil, maiden's tears and methanol.. [comments deleted in good taste]. Sorry if I offend Fox fans, I know they made a few engines that worked.
MJD
I have a NIB .74 I was given in about '93 that I've never run and will find it's way into an RC market place soon as I find the barrel/idle stop screw I removed for some reason, I think I borrowed it for a long-since-gone Fox .15. Of all the stuff I rooted through recently, that was the 1st and easiest choice for my ''auction site'' bin. I wouldn't waste 10 minutes on it myself. Years ago I bought a Fox .15BB RC and an OS .15 FP at roughly the same time. I gave away the Fox shortly after, and I still have the FP and it runs like a top and doesn't act up when I wear the wrong colour shirt to the field. Finicky carbs, overboard compression, metallurgy that threatens to lock up if you don't run equal parts of castor oil, maiden's tears and methanol.. [comments deleted in good taste]. Sorry if I offend Fox fans, I know they made a few engines that worked.
MJD
