Club FOX!
06-11-2011, 07:42 PM
#2151
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RE: Club FOX!
I have an older FOX .78......I Iam considering a replacement carburetor...
Which should I buy, the FOX (late model) 2 needle carb. or a Conley/Perry with FOX adapter either way they cost about $50.00...
ANY opinions?
Which should I buy, the FOX (late model) 2 needle carb. or a Conley/Perry with FOX adapter either way they cost about $50.00...
ANY opinions?
06-11-2011, 07:53 PM
#2152
RE: Club FOX!
ORIGINAL: Don Ness
I have a Fox Eagle .74, runs great wide open, but when I try to idle it down, it dies like I sut the fuel off. Fox says it won't run with the EZ carb, it needs a two needle valve one. Has any one had this problem, and did a new $50 carb cure the problem.
I have a Fox Eagle .74, runs great wide open, but when I try to idle it down, it dies like I sut the fuel off. Fox says it won't run with the EZ carb, it needs a two needle valve one. Has any one had this problem, and did a new $50 carb cure the problem.
One thought is your fuel tank placement in relation to the carb, and how long the fuel tubing is in length going to the carb. I assume you are using muffler pressure to the fuel tank as well. If the fuel tank is too low, or the fuel line is too long, or the prop is too small, or the glow plug is contaminated, then the engine may have idle problems on you. If you have some stuff like a fuel filter, fuel filler device, etc. They may be leaking a little too. Also if it idles Ok when the fuel tank is full versus when the fuel tank is low on fuel, that might mean it needs to be richened out a little more too.
Now if you have the older 2 needle carb and it works fine, there is no reason to upgrade to the new carb, unless you want to.
06-11-2011, 07:54 PM
#2153
RE: Club FOX!
ORIGINAL: PETEPA
I have an older FOX .78......I Iam considering a replacement carburetor...
Which should I buy, the FOX (late model) 2 needle carb. or a Conley/Perry with FOX adapter either way they cost about $50.00...
ANY opinions?
I have an older FOX .78......I Iam considering a replacement carburetor...
Which should I buy, the FOX (late model) 2 needle carb. or a Conley/Perry with FOX adapter either way they cost about $50.00...
ANY opinions?
Now if the venerable butterfly carb is working fine for you, then there really isn't any reason to upgrade, unless you want to. The carbs are normally very good.
I use a short length of neoprine black tubing on the tapered fuel fitting. The silcon tubing will simply slip right on off on you, but the neoprine tubing will sort of bond to the aluminum fitting.
When Fox designed and manufactured this carb, they didn't have silicon tubing yet.
06-12-2011, 06:33 AM
#2154
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RE: Club FOX!
It has a different 2 needle carb than the one in your picture....i can't get it to "lean out"...When I set it according to the instructions with the engine, I can get it to run but "sloppy rich". When i try to lean it out, It's still sloppy rich with the Hi speed needle all the way in.
I have seen the new Fox carb. on a FOX .45 an it worked perfectly rite out of the box....
Bob Baumstien listed a Perry with FOX adapter in his inventory but he just wrote back and said he no longer had it.... So I guess that answered my question....
I have seen the new Fox carb. on a FOX .45 an it worked perfectly rite out of the box....
Bob Baumstien listed a Perry with FOX adapter in his inventory but he just wrote back and said he no longer had it.... So I guess that answered my question....
06-12-2011, 06:46 AM
#2155
RE: Club FOX!
Petepa, Have you run your .74 engine on a engine test stand? I suspect something is wrong somewhere, but it may not be the engine. Running the engine on a test stand would help isolate the problem. The other thing is if you tried a new glow plug or not too.
What fuel are you using?
What fuel are you using?
06-12-2011, 05:44 PM
#2156
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RE: Club FOX!
It is an older FOX .78 (not a .74),
It has been used very little but the carburetor will not allow me to lean out the engine.....I am running it on a test stand that I use for all of my engines....
When I set the needles per the instructions included with the engine, It starts ok and runs sloppy rich...I can crank the HS needle all the way
closed and it is still sloppy rich....4cycling mostly and blowing unused fuel out the exhaust....This is a first for me with any engine..
I have an extensive collection This is my first FOX though....
It doesn't seem to matter if I use muffler pressure or not either.
This is an early two needle carb they had before the "easy needle" ( air bleed) carb. FYI
I like the looks of the new FOX carb. but don't like the price (approx. $50.00) A friend bought one for his older FOX.45 and it works great!
It has been used very little but the carburetor will not allow me to lean out the engine.....I am running it on a test stand that I use for all of my engines....
When I set the needles per the instructions included with the engine, It starts ok and runs sloppy rich...I can crank the HS needle all the way
closed and it is still sloppy rich....4cycling mostly and blowing unused fuel out the exhaust....This is a first for me with any engine..
I have an extensive collection This is my first FOX though....
It doesn't seem to matter if I use muffler pressure or not either.
This is an early two needle carb they had before the "easy needle" ( air bleed) carb. FYI
I like the looks of the new FOX carb. but don't like the price (approx. $50.00) A friend bought one for his older FOX.45 and it works great!
06-12-2011, 07:03 PM
#2157
RE: Club FOX!
I thought the new Fox carb for $49.95 was pretty cheap myself. Wait til you price a OS carb for a .60 engine ($69.95 for a OS carb for a 75AX engine, retail $81.99), or one of the other top tier brands carb prices.
06-13-2011, 05:09 AM
#2158
RE: Club FOX!
earlwb,
I have used several of the low DB Bisson Mufflers and think they are fantastic. Normally the Low DB muffler is larger for a given size. I have bought one for every engine range( 20-40, 40-60, 60-80) I have. I haven't tried one on a Fox yet, but plan to do so soon. They have been superb in every other application I have tried. They have a very nice sound!
I have used several of the low DB Bisson Mufflers and think they are fantastic. Normally the Low DB muffler is larger for a given size. I have bought one for every engine range( 20-40, 40-60, 60-80) I have. I haven't tried one on a Fox yet, but plan to do so soon. They have been superb in every other application I have tried. They have a very nice sound!
06-13-2011, 05:33 AM
#2159
RE: Club FOX!
PETEPA,
The older 78 did not need muffler pressure so don't use it. That should have a midrange adjustment. Was this the earlier buttyfly valve carb or the later twin needle MK X? I am thinking the needle may be bad. Some were sent with the wrong or improperly tapered needle? If the MK X you can still buy needles for it. If not maybe someone here could probably show how to file it to the correct shape.
The older 78 did not need muffler pressure so don't use it. That should have a midrange adjustment. Was this the earlier buttyfly valve carb or the later twin needle MK X? I am thinking the needle may be bad. Some were sent with the wrong or improperly tapered needle? If the MK X you can still buy needles for it. If not maybe someone here could probably show how to file it to the correct shape.
06-13-2011, 05:50 AM
#2160
RE: Club FOX!
ORIGINAL: earlwb
Yiou would want to use the newest model carb Fox makes on your .74 engine. The EZ carb wasn't really intended for the .60 and ,74 engines, so it may or may not work on them. The idle circuit may not be rich enough to work on the big engines. But the EZ carb works fine on the .40 and ,45 engines. Actually the newest carb is a modernized 2 needle carb, the low speed needle is sort of hidden, but it is still there. I can vouch for the newest 2 needle carb as it works good on the big engines. Normally you don't even need to touch the low speed needle, or if you do it is only a small tweak for the adjustment.
One thought is your fuel tank placement in relation to the carb, and how long the fuel tubing is in length going to the carb. I assume you are using muffler pressure to the fuel tank as well. If the fuel tank is too low, or the fuel line is too long, or the prop is too small, or the glow plug is contaminated, then the engine may have idle problems on you. If you have some stuff like a fuel filter, fuel filler device, etc. They may be leaking a little too. Also if it idles Ok when the fuel tank is full versus when the fuel tank is low on fuel, that might mean it needs to be richened out a little more too.
Now if you have the older 2 needle carb and it works fine, there is no reason to upgrade to the new carb, unless you want to.
[img][/img]
ORIGINAL: Don Ness
I have a Fox Eagle .74, runs great wide open, but when I try to idle it down, it dies like I sut the fuel off. Fox says it won't run with the EZ carb, it needs a two needle valve one. Has any one had this problem, and did a new $50 carb cure the problem.
I have a Fox Eagle .74, runs great wide open, but when I try to idle it down, it dies like I sut the fuel off. Fox says it won't run with the EZ carb, it needs a two needle valve one. Has any one had this problem, and did a new $50 carb cure the problem.
One thought is your fuel tank placement in relation to the carb, and how long the fuel tubing is in length going to the carb. I assume you are using muffler pressure to the fuel tank as well. If the fuel tank is too low, or the fuel line is too long, or the prop is too small, or the glow plug is contaminated, then the engine may have idle problems on you. If you have some stuff like a fuel filter, fuel filler device, etc. They may be leaking a little too. Also if it idles Ok when the fuel tank is full versus when the fuel tank is low on fuel, that might mean it needs to be richened out a little more too.
Now if you have the older 2 needle carb and it works fine, there is no reason to upgrade to the new carb, unless you want to.
[img][/img]
The problem I am having with my .74 is that it runs perfectly on the ground, but quits at part throttle while up in the air. I know that usually means that I might be too lean on the low end, but I was running fairly rich on the bench (I have limited experience with Fox engines though). But you mention that the EZ carb is not intended for the larger .74? Would that possibly be my problem?
06-13-2011, 07:21 AM
#2161
RE: Club FOX!
I don't think so. your problem is something else. Actually in retrospect thinking, I think the EZ carb ought to work on a .74 engine. The other guy had a problem with idle not high speed operations. It might simply be a defect with the carb in that case.
In your case, You are either a little too lean or a little too rich with your engine. I can't tell from here though, one has to be there to see and hear it. it may also be a really tight engine and it is running a little too hot in the air when the prop unloads more.
I would suggest filling the fuel tank to 1/4 full and then start up and run the engine, and adjust the needle valve for a low fuel tank condition, do it nose high to ensure it is running Ok with the nose pointed up. Then stop the engine, and refill to full. Then start it up and see what happens.
If the engine won't run at 1/4 of a tank of fuel, then you have a fuel problem of some sort with the fuel tank and fuel lines or something.
In your case, You are either a little too lean or a little too rich with your engine. I can't tell from here though, one has to be there to see and hear it. it may also be a really tight engine and it is running a little too hot in the air when the prop unloads more.
I would suggest filling the fuel tank to 1/4 full and then start up and run the engine, and adjust the needle valve for a low fuel tank condition, do it nose high to ensure it is running Ok with the nose pointed up. Then stop the engine, and refill to full. Then start it up and see what happens.
If the engine won't run at 1/4 of a tank of fuel, then you have a fuel problem of some sort with the fuel tank and fuel lines or something.
06-13-2011, 07:45 AM
#2162
RE: Club FOX!
ORIGINAL: earlwb
I don't think so. your problem is something else. Actually in retrospect thinking, I think the EZ carb ought to work on a .74 engine. The other guy had a problem with idle not high speed operations. It might simply be a defect with the carb in that case.
In your case, You are either a little too lean or a little too rich with your engine. I can't tell from here though, one has to be there to see and hear it. it may also be a really tight engine and it is running a little too hot in the air when the prop unloads more.
I would suggest filling the fuel tank to 1/4 full and then start up and run the engine, and adjust the needle valve for a low fuel tank condition, do it nose high to ensure it is running Ok with the nose pointed up. Then stop the engine, and refill to full. Then start it up and see what happens.
If the engine won't run at 1/4 of a tank of fuel, then you have a fuel problem of some sort with the fuel tank and fuel lines or something.
I don't think so. your problem is something else. Actually in retrospect thinking, I think the EZ carb ought to work on a .74 engine. The other guy had a problem with idle not high speed operations. It might simply be a defect with the carb in that case.
In your case, You are either a little too lean or a little too rich with your engine. I can't tell from here though, one has to be there to see and hear it. it may also be a really tight engine and it is running a little too hot in the air when the prop unloads more.
I would suggest filling the fuel tank to 1/4 full and then start up and run the engine, and adjust the needle valve for a low fuel tank condition, do it nose high to ensure it is running Ok with the nose pointed up. Then stop the engine, and refill to full. Then start it up and see what happens.
If the engine won't run at 1/4 of a tank of fuel, then you have a fuel problem of some sort with the fuel tank and fuel lines or something.
Regarding prop size, would a 12x7 be too small for it, causing too much unloading in flight?
06-13-2011, 08:09 AM
#2163
RE: Club FOX!
According to the instructions the earlier eagle IV .60 and .74 engines came with the EZ carb for a while, so the carb ought to work fine.
ref Eagle IV instructions: http://www.rcgroups.com/forums/showa...8&d=1298466003
in this thread here http://www.rcgroups.com/forums/showt...955929&page=11
Fox suggests a prop from 11x7 all the way up to a 14x6 for the engines. It depends on the airplane, and other factors though.
So a 12x7 prop should be fine.
ref Eagle IV instructions: http://www.rcgroups.com/forums/showa...8&d=1298466003
in this thread here http://www.rcgroups.com/forums/showt...955929&page=11
Fox suggests a prop from 11x7 all the way up to a 14x6 for the engines. It depends on the airplane, and other factors though.
So a 12x7 prop should be fine.
06-14-2011, 10:47 AM
#2164
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RE: Club FOX!
I have 2 eagle 60's nib need mufflers modle # 16099 verticle bolts , 1 25 need the same , 1 19 need the same , anyone know where I can find them ? thanks in advance.
charlie
charlie
06-14-2011, 11:03 AM
#2165
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RE: Club FOX!
See the attached link to FOX manufacturing.....
http://www.foxmanufacturing.com/inde...ndex&cPath=143
http://www.foxmanufacturing.com/inde...ndex&cPath=143
06-14-2011, 12:09 PM
#2167
RE: Club FOX!
ORIGINAL: lazyace
I have 2 eagle 60's nib need mufflers modle # 16099 verticle bolts , 1 25 need the same , 1 19 need the same , anyone know where I can find them ? thanks in advance.
charlie
I have 2 eagle 60's nib need mufflers modle # 16099 verticle bolts , 1 25 need the same , 1 19 need the same , anyone know where I can find them ? thanks in advance.
charlie
Now the Eagle I has been out of production for many years now, so one has to search places like Ebay for the mufflers that fit them.
But you can use the muffler that fits the new Fox .60 CL stunt engine with ceramic cylinder too. The Fox Eagle I, Fox Hawk .60, and the new .60 CL engine all can use the same mufflers. You'll have to callFox about the .60 CL engine muffler as they aen't showing it on their website at this time. I have also seen it pop up on Ebay from time to time too.
the Mac's Mufflers one piece design like the 6340 for example, happens to fit the Fox .19 and .25 engines as well as the .29 and .35 or 36RC engines too.
06-14-2011, 12:18 PM
#2168
RE: Club FOX!
ORIGINAL: earlwb
Are these the Eagle I .60 engines? or the Eagle II, III or IV engines. Petepa gave a link to Fox manufacturing for the newer Eagle Schnuerle engines and where to get mufflers for them.
Now the Eagle I has been out of production for many years now, so one has to search places like Ebay for the mufflers that fit them.
But you can use the muffler that fits the new Fox .60 CL stunt engine with ceramic cylinder too. The Fox Eagle I, Fox Hawk .60, and the new .60 CL engine all can use the same mufflers. You'll have to call Fox about the .60 CL engine muffler as they aen't showing it on their website at this time. I have also seen it pop up on Ebay from time to time too.
the Mac's Mufflers one piece design like the 6340 for example, happens to fit the Fox .19 and .25 engines as well as the .29 and .35 or 36RC engines too.
ORIGINAL: lazyace
I have 2 eagle 60's nib need mufflers modle # 16099 verticle bolts , 1 25 need the same , 1 19 need the same , anyone know where I can find them ? thanks in advance.
charlie
I have 2 eagle 60's nib need mufflers modle # 16099 verticle bolts , 1 25 need the same , 1 19 need the same , anyone know where I can find them ? thanks in advance.
charlie
Now the Eagle I has been out of production for many years now, so one has to search places like Ebay for the mufflers that fit them.
But you can use the muffler that fits the new Fox .60 CL stunt engine with ceramic cylinder too. The Fox Eagle I, Fox Hawk .60, and the new .60 CL engine all can use the same mufflers. You'll have to call Fox about the .60 CL engine muffler as they aen't showing it on their website at this time. I have also seen it pop up on Ebay from time to time too.
the Mac's Mufflers one piece design like the 6340 for example, happens to fit the Fox .19 and .25 engines as well as the .29 and .35 or 36RC engines too.
06-14-2011, 01:13 PM
#2169
RE: Club FOX!
here is my PBF plane with a Fox .25 on it using a MAc's Muffler
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
06-14-2011, 01:39 PM
#2170
RE: Club FOX!
I had forgotten about it, but the Fox .35 CL stunt engine, as currently sold by Fox, has a muffler that ought to fit the .19, .25., .35 and .36RC engines too. I haven't tried it myself yet, so I can't be sure though. But I doubt fox has changed the molds for the engine castings all that much over the years.
06-25-2011, 05:48 PM
#2171
RE: Club FOX!
I got back to testing my used Fox 74 Eagle IV on the bench. This time I changed the fuel to Morgan Omega 5% with 15% synthetic oil and 5% castor oil. I used a Top Flite wood prop 13x6. It ran well with good transition, but still rich at the high speed with some transition hesitation close to the top.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.
06-25-2011, 05:51 PM
#2172
RE: Club FOX!
ORIGINAL: earlwb
here is my PBF plane with a Fox .25 on it using a MAc's Muffler
[img][/img]
[img][/img]
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
[img][/img]
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
[img][/img]
here is my PBF plane with a Fox .25 on it using a MAc's Muffler
[img][/img]
[img][/img]
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
[img][/img]
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
[img][/img]
06-25-2011, 07:12 PM
#2173
RE: Club FOX!
ORIGINAL: hsukaria
I got back to testing my used Fox 74 Eagle IV on the bench. This time I changed the fuel to Morgan Omega 5% with 15% synthetic oil and 5% castor oil. I used a Top Flite wood prop 13x6. It ran well with good transition, but still rich at the high speed with some transition hesitation close to the top.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.
I got back to testing my used Fox 74 Eagle IV on the bench. This time I changed the fuel to Morgan Omega 5% with 15% synthetic oil and 5% castor oil. I used a Top Flite wood prop 13x6. It ran well with good transition, but still rich at the high speed with some transition hesitation close to the top.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.
06-25-2011, 07:13 PM
#2174
RE: Club FOX!
ORIGINAL: hsukaria
That PBF plane looks really wild. Is that built from plans anywhere?
ORIGINAL: earlwb
here is my PBF plane with a Fox .25 on it using a MAc's Muffler
[img][/img]
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
here is my PBF plane with a Fox .25 on it using a MAc's Muffler
[img][/img]
Here is a Mac's muffler on my venerable Fox 36RC engine as shown here.
it is actually fairly easy to make bridge adapters for fitting different mufflers to the engines.
Here is where I made a bridge adapter to fit a K&B muffler to a old wart Fox .45 engine. You don't need anything fancy for tools, just a hacksaw, drill press (unless you are really good with a hand drill), and some assorted hand files. You can use one piece to adapt or two pieces if the bolt holes interfere with each other.
http://mypage.yhti.net/~dmcdnld/pizzabox.htm
They are intended to fly slow like a 3D hovering machine does.
You can also make angled cuts on the front to make them into a delta type of plane if you want to fly faster too.
You can mount the motor mount and spine on the bottom for overhand hand launches. Or mount the spine and motor mount on top if you like the underlanded launch method.
06-26-2011, 04:37 AM
#2175
RE: Club FOX!
ORIGINAL: earlwb
I don't have any reason for my engines to idle below 2,400 to 2,600 RPMs. That might be your problem, trying to idle too slow. Now granted after a engine is run in really good, it'll likely idle slower. Now granted if you are flying off of pavement, then a lower idle might be more useful, but I don't remember needing to idle at 2,000 rpms or less even then, when I flew off of hard pavement before.
ORIGINAL: hsukaria
I got back to testing my used Fox 74 Eagle IV on the bench. This time I changed the fuel to Morgan Omega 5% with 15% synthetic oil and 5% castor oil. I used a Top Flite wood prop 13x6. It ran well with good transition, but still rich at the high speed with some transition hesitation close to the top.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.
I got back to testing my used Fox 74 Eagle IV on the bench. This time I changed the fuel to Morgan Omega 5% with 15% synthetic oil and 5% castor oil. I used a Top Flite wood prop 13x6. It ran well with good transition, but still rich at the high speed with some transition hesitation close to the top.
WOT 10500 RPM without trying for maximum setting. Still quite rich.
IDLE 2000 RPM (could go as low as 1800 rpm, but a bit unsteady). It would idle indefinitely and then transition to WOT with slight hesitation due to rich high end.
Now the question is: Will it stall while flying on part/low throttle? I can't tell, I am not experienced enough, but it happened to me before.
BTW, I don't have a plane for this engine anymore. I have to find a cheap and simple airframe for it to do my testing before I put it in a warbird model.