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Cox Engine of The Month
Is this enough prop?
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Cribbs74- Moderator
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Re: Is this enough prop?
microflitedude wrote:Looks better than the ol' GB R2.....
What does? the prop,cowl or the clearance?
Cribbs74- Moderator
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Re: Is this enough prop?
cribbs74 wrote:microflitedude wrote:Looks better than the ol' GB R2.....
What does? the prop,cowl or the clearance?
Clearance.
Re: Is this enough prop?
thats great clearance, I've seen planes with less. What size is prop? and what are you gonna used to turn prop?
Re: Is this enough prop?
Mark Boesen wrote:thats great clearance, I've seen planes with less. What size is prop? and what are you gonna used to turn prop?
Prop is a 7x4, built a modified throttled Texaco like engine. I need to get a tach so I can figure out what it's turning. I don't need to worry about duration as it is externally tanked.
Cribbs74- Moderator
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Posts : 11895
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Re: Is this enough prop?
I'm not sure if I'm right, but i'd think you'd want a low comp head with maybe 3-4 gaskets, dual port cylinder, so as much fuel/air flow as possible and a low compression head to fill up with a lot of fuel and air for a big bang to spin that larger prop.
Re: Is this enough prop?
Mark Boesen wrote:I'm not sure if I'm right, but i'd think you'd want a low comp head with maybe 3-4 gaskets, dual port cylinder, so as much fuel/air flow as possible and a low compression head to fill up with a lot of fuel and air for a big bang to spin that larger prop.
That's pretty much what I did, I posted a pic of it in the Cox discussions section if you wish to take a gander.
Cribbs74- Moderator
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Posts : 11895
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Re: Is this enough prop?
I know you aren't going to run official Texaco races, but I'm wondering if you set it up to run like a Texaco engine? For instance a small Texaco sized venturi to restrict the fuel flow down to the Texaco spec? The small fuel flow is the heart of Texaco endurance performance; to fly the longest time on a 5 or 8cc tank of fuel. I think it has the smallest venturi of any Cox engine. But I cannot find any good info searching for it, so I'm just saying what I can remember about the Tex. I did read about one guy winning an event, flying the whole thing at about 4400 RPM.cribbs74 wrote:Mark Boesen wrote:I'm not sure if I'm right, but i'd think you'd want a low comp head with maybe 3-4 gaskets, dual port cylinder, so as much fuel/air flow as possible and a low compression head to fill up with a lot of fuel and air for a big bang to spin that larger prop.
That's pretty much what I did, I posted a pic of it in the Cox discussions section if you wish to take a gander.
_________________
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...and never Ever think about how good you are at something...
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Re: Is this enough prop?
Yes the smallest venturi of the .049s I think he is running an external tank though.
Re: Is this enough prop?
nitroairplane wrote:Yes the smallest venturi of the .049s I think he is running an external tank though.
Yep, I do have a correct backplate should the need arise however, I wanr this one to perform as well as possible as much thrust/rpm as the little .049 can give. I am going to build up an actual Texaco for future use on a slow flyer.
Cribbs74- Moderator
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Re: Is this enough prop?
Okay.
But if you want the best from a .049 turning a large prop diesel is the way to go.
But if you want the best from a .049 turning a large prop diesel is the way to go.
Re: Is this enough prop?
RknRusty wrote:I know you aren't going to run official Texaco races, but I'm wondering if you set it up to run like a Texaco engine? For instance a small Texaco sized venturi to restrict the fuel flow down to the Texaco spec? The small fuel flow is the heart of Texaco endurance performance; to fly the longest time on a 5 or 8cc tank of fuel. I think it has the smallest venturi of any Cox engine. But I cannot find any good info searching for it, so I'm just saying what I can remember about the Tex. I did read about one guy winning an event, flying the whole thing at about 4400 RPM.cribbs74 wrote:Mark Boesen wrote:I'm not sure if I'm right, but i'd think you'd want a low comp head with maybe 3-4 gaskets, dual port cylinder, so as much fuel/air flow as possible and a low compression head to fill up with a lot of fuel and air for a big bang to spin that larger prop.
That's pretty much what I did, I posted a pic of it in the Cox discussions section if you wish to take a gander.
4400 RPM! Wow that is slow. I am surprised it was even firing down that low.
Cribbs74- Moderator
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Re: Is this enough prop?
cribbs74 wrote:RknRusty wrote:I know you aren't going to run official Texaco races, but I'm wondering if you set it up to run like a Texaco engine? For instance a small Texaco sized venturi to restrict the fuel flow down to the Texaco spec? The small fuel flow is the heart of Texaco endurance performance; to fly the longest time on a 5 or 8cc tank of fuel. I think it has the smallest venturi of any Cox engine. But I cannot find any good info searching for it, so I'm just saying what I can remember about the Tex. I did read about one guy winning an event, flying the whole thing at about 4400 RPM.cribbs74 wrote:Mark Boesen wrote:I'm not sure if I'm right, but i'd think you'd want a low comp head with maybe 3-4 gaskets, dual port cylinder, so as much fuel/air flow as possible and a low compression head to fill up with a lot of fuel and air for a big bang to spin that larger prop.
That's pretty much what I did, I posted a pic of it in the Cox discussions section if you wish to take a gander.
Yes they do and to do so they must run very lean and this is very hot and that is why the engines have the extra cooling.
4400 RPM! Wow that is slow. I am surprised it was even firing down that low.
Re: Is this enough prop?
Indra,
I didn't see your plug for diesel till after I posted. Very sneaky my friend! I may try diesel one day. I have that .020 diesel head from you so really all I need is some fuel.
I didn't see your plug for diesel till after I posted. Very sneaky my friend! I may try diesel one day. I have that .020 diesel head from you so really all I need is some fuel.
Cribbs74- Moderator
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Posts : 11895
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Re: Is this enough prop?
Cool,
you may like diesel operation I like it as when I go flying I don't need to bring a glow start with me and if it is FF or CL I don't need to bring anything electric at all.
you may like diesel operation I like it as when I go flying I don't need to bring a glow start with me and if it is FF or CL I don't need to bring anything electric at all.
Re: Is this enough prop?
True, your selling me!
Cribbs74- Moderator
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Re: Is this enough prop?
Well now, I did read that on the Internet. So there is the slightest possibility it was exaggerated, but I guess it must've run pretty slow. I doubt if the plane could have been much more than 2 ounces plus the engine, and a big wing area.................... Now that you mention it, in the light of a fresh day, 4400 smells like BS. But I know nothing of larg props either.cribbs74 wrote:
4400 RPM! Wow that is slow. I am surprised it was even firing down that low.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
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