Log in
Search
Latest topics
» COX .020 RC PROJECTby TD ABUSER Today at 2:59 pm
» Cox 020 PeeWee rebuild questions
by LooseSpinner99 Today at 2:21 pm
» Cox Texaco and Texaco Jr. built with Kustom Kraftsman's parts.
by BillLee Today at 11:06 am
» Jim Walker Firebaby
by rdw777 Today at 7:36 am
» Project Cox .049 r/c & Citabrian Champion
by rdw777 Today at 7:27 am
» OS MAX-D
by Yabby Today at 4:09 am
» Irvine Mills .75 replica
by ffkiwi Today at 3:29 am
» Happy Birthday Robert ( Rsv1cox )
by Kim Today at 1:48 am
» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (October 2024)
by GallopingGhostler Yesterday at 10:01 pm
» WILLY NILLY
by MANDALAY Yesterday at 8:56 pm
» Stick built rubber powered Scientific ME-109
by DPCM Yesterday at 3:36 pm
» The Cabin.........A carpenters nightmare.
by rsv1cox Yesterday at 3:26 pm
Cox Engine of The Month
Cox Texaco Thoughts
Page 1 of 1
Cox Texaco Thoughts
Would like to arrive at some of the Cox Texaco benefits with my Bee or former product engines.
Would adding gaskets under the head allow you to swing a larger prop?
I'm into scale and draggy type of models.
Thanks for any help.
Scratch...
Would adding gaskets under the head allow you to swing a larger prop?
I'm into scale and draggy type of models.
Thanks for any help.
Scratch...
Scratch049- Bronze Member
- Posts : 55
Join date : 2018-08-17
Age : 86
Location : South Carolina
Re: Cox Texaco Thoughts
The biggest thing that makes a Texaco a Texaco is the venturi size. It’s smaller than usual, but can’t remember the size off hand. If I were you I would run a product engine externally tanked with a texaco head on it for the increased cooling benefit. The small venturi on the Texaco is only there for fuel economy.
As far as head shims, you will have to experiment, I would imagine lowering the compression would be beneficial in your case, but the Texaco head has the same combustion shape as the standard low compression Cox 325 head.
Ron
As far as head shims, you will have to experiment, I would imagine lowering the compression would be beneficial in your case, but the Texaco head has the same combustion shape as the standard low compression Cox 325 head.
Ron
Cribbs74- Moderator
-
Posts : 11907
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Cox Texaco Thoughts
Actually there is an additional benefit. Economy will be higher either way, but the slower turning piston is not pulling as much air velocity through the venturi. By narrowing it makes for easier needle adjustment and better atomizing of the fuel for a more consistent run.
GallopingGhostler- Top Poster
-
Posts : 5619
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: Cox Texaco Thoughts
Many thanks for your help gentlemen.
Please bear with me as I am just learning about these engines.
Refugee from electrics.
Ron:
I have some spare heads that I examined as well as a Texaco head and was surprised to find that it was exactly as you said.
I always assumed that the Texaco head was a lower compression head.
The 'Texaco head" (part 315) is simply a larger heat sink for the engine.
Also, a longer way for the element to travel.
Here are the engines that I have available for this project.
They were all at some point a "product" engine.
In this case can I assume that you are speaking of the one with the grey back plate and no gas tank attached?
Again, thanks very much for sharing your knowledge.
Scratch...
Please bear with me as I am just learning about these engines.
Refugee from electrics.
Ron:
I have some spare heads that I examined as well as a Texaco head and was surprised to find that it was exactly as you said.
I always assumed that the Texaco head was a lower compression head.
The 'Texaco head" (part 315) is simply a larger heat sink for the engine.
Also, a longer way for the element to travel.
Here are the engines that I have available for this project.
They were all at some point a "product" engine.
In this case can I assume that you are speaking of the one with the grey back plate and no gas tank attached?
Again, thanks very much for sharing your knowledge.
Scratch...
Scratch049- Bronze Member
- Posts : 55
Join date : 2018-08-17
Age : 86
Location : South Carolina
Re: Cox Texaco Thoughts
Yes, the grey plastic horseshoe/snorkel one. I am assuming you are wanting to fly in a RC application and that style would allow a longer run time with an external tank.
If you want an integral tank than any 8CC tank will do, I would however consider the Texaco backplate if you go that route.
You also have throttle options if you want to just tame a regular engine to fly slower.
If you want an integral tank than any 8CC tank will do, I would however consider the Texaco backplate if you go that route.
You also have throttle options if you want to just tame a regular engine to fly slower.
Cribbs74- Moderator
-
Posts : 11907
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Cox Texaco Thoughts
Ron's right on options. The Sure Start venturi is somewhat restrictive already, some temporarily remove the brass spray bar and rebore slightly larger for more top end power.
The Golden Bee you have has potential, too. Here's the May 1961 Aeromodeller engine test article on both the Golden and Babe Bees.
sceptreflight.com Model Engine Tests, Cox Babe Bee & Golden Bee
These are the RPM's on various props available back then.
I think Masters still makes an 8x3. You can experiment with various props once you have your model built. Personally I've never run oversize props on my .049's reed valves because I never had the need.
But I found the diminutive Cox .020 Pee Wee to be a torquer, I was getting a minute extra flight with a Top Flite nylon 5.25x3 prop on my 27 inch span T.F. RC Schoolboy, my 20 inch span T.F. RC Roaring 20 (scaled down version of the Top Dawg) and my 20 inch span Ace RC Littlest Stick at same flight speeds as the so called more optimal Cox 4.5x2 competition prop.
A lot depends on what model you plan to install the engine on. The "What If's" are easily solved with experimenting, finding what props, heads and fuel mix were best.
The Golden Bee you have has potential, too. Here's the May 1961 Aeromodeller engine test article on both the Golden and Babe Bees.
sceptreflight.com Model Engine Tests, Cox Babe Bee & Golden Bee
These are the RPM's on various props available back then.
I think Masters still makes an 8x3. You can experiment with various props once you have your model built. Personally I've never run oversize props on my .049's reed valves because I never had the need.
But I found the diminutive Cox .020 Pee Wee to be a torquer, I was getting a minute extra flight with a Top Flite nylon 5.25x3 prop on my 27 inch span T.F. RC Schoolboy, my 20 inch span T.F. RC Roaring 20 (scaled down version of the Top Dawg) and my 20 inch span Ace RC Littlest Stick at same flight speeds as the so called more optimal Cox 4.5x2 competition prop.
A lot depends on what model you plan to install the engine on. The "What If's" are easily solved with experimenting, finding what props, heads and fuel mix were best.
GallopingGhostler- Top Poster
-
Posts : 5619
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: Cox Texaco Thoughts
Really appreciate your help,gentlemen.
Right,Ron.
Its for an RC model.
I'd like to plans bash a Q-Tee to give the look of a Sperry Messenger.
Already similar in appearance, but with added wing supports. = Draggy.
(Yup, I'm a scale freak.)
I think I'd like to go the external tank route as I do enjoy touch and go's.
Plan to use the throttle insert or a exhaust restrictor.
I don't think that Cox International has a separate back plate for the Texaco.
Has for the Baby Bee.
I have not yet taken one of these engines apart, so not greatly familiar with them.
I do have a large order of gasket kits etc.coming from Cox International.
Thanks for that info GG.
I do have a Texaco prop ordered but need to find others for my experimenting.
Still need to consider fuel and a glo plug heater thingie.
Thanks again for all your help.
Scratch...
Right,Ron.
Its for an RC model.
I'd like to plans bash a Q-Tee to give the look of a Sperry Messenger.
Already similar in appearance, but with added wing supports. = Draggy.
(Yup, I'm a scale freak.)
I think I'd like to go the external tank route as I do enjoy touch and go's.
Plan to use the throttle insert or a exhaust restrictor.
I don't think that Cox International has a separate back plate for the Texaco.
Has for the Baby Bee.
I have not yet taken one of these engines apart, so not greatly familiar with them.
I do have a large order of gasket kits etc.coming from Cox International.
Thanks for that info GG.
I do have a Texaco prop ordered but need to find others for my experimenting.
Still need to consider fuel and a glo plug heater thingie.
Thanks again for all your help.
Scratch...
Scratch049- Bronze Member
- Posts : 55
Join date : 2018-08-17
Age : 86
Location : South Carolina
Re: Cox Texaco Thoughts
Regarding Q-Tee's, they have ample wing area, will even fly at 6,500 ft. elevation on a 1970's Golden Bee. At sea level, a T/F 5.25x4 prop flew it at about the same speed as a 6x3 prop, but at 6,500 ft it barely lumbered along with the 5.25x4 whereas with the 6x3 it moved out decently.
Not long ago before crashing it (built it in the late 1970's, been repaired many times), I powered it with a Norvel Big Mig .061. It turned it from flying trainer like to a little tiger with good speed and wind penetration.
Keep the Q-Tee light. Make sure the CG is set per plans. Initial test flights, use a standard prop like a 6x3. Once trimmed and adjusted, then you can experiment with props. If it were me, I'd start out with the 7x3, then graduate up to an 8x3, etc. You'll find out what props work best to obtain the effects you desire. By doing gradual increases to engine load with increasing prop diameters and pitch, you'll be able to discover what additional changes are needed to the engine to improve the run (heads, etc.), plus what props to stop at and what does and doesn't work.
Not long ago before crashing it (built it in the late 1970's, been repaired many times), I powered it with a Norvel Big Mig .061. It turned it from flying trainer like to a little tiger with good speed and wind penetration.
Keep the Q-Tee light. Make sure the CG is set per plans. Initial test flights, use a standard prop like a 6x3. Once trimmed and adjusted, then you can experiment with props. If it were me, I'd start out with the 7x3, then graduate up to an 8x3, etc. You'll find out what props work best to obtain the effects you desire. By doing gradual increases to engine load with increasing prop diameters and pitch, you'll be able to discover what additional changes are needed to the engine to improve the run (heads, etc.), plus what props to stop at and what does and doesn't work.
GallopingGhostler- Top Poster
-
Posts : 5619
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Scratch049- Bronze Member
- Posts : 55
Join date : 2018-08-17
Age : 86
Location : South Carolina
Re: Cox Texaco Thoughts
Any Texaco Cox engine is the same as any other .049 cox engine...can be run tanked or back plated all the crank cases are the same
Except the Cast crank case needs a different back end set up...both Matt and Bernie have all the parts
The Texaco was designed for the specific Texaco Event where length of flight duration was timed on either the 5 cc or 8 cc tanks with a specific fuel
For your RC old timed scale use ANY of the Cox family can be made to provide you the motive power and duration you desire and the Texaco may or may not be the best solution
You night even consider a beam OR Radial mounted Cox Medallion for some of those neat birds...Hard tank of better yet IMO a balloon tank
http://www.texastimers.com/
Except the Cast crank case needs a different back end set up...both Matt and Bernie have all the parts
The Texaco was designed for the specific Texaco Event where length of flight duration was timed on either the 5 cc or 8 cc tanks with a specific fuel
For your RC old timed scale use ANY of the Cox family can be made to provide you the motive power and duration you desire and the Texaco may or may not be the best solution
You night even consider a beam OR Radial mounted Cox Medallion for some of those neat birds...Hard tank of better yet IMO a balloon tank
http://www.texastimers.com/
fredvon4- Top Poster
-
Posts : 4009
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas
Re: Cox Texaco Thoughts
Unfortunately, this statement is at the bottom of their web page:
Texas Timers wrote:The Cox mount is sold out. No more. The VA MK II is also sold out. The AME mount is sold out No more.
GallopingGhostler- Top Poster
-
Posts : 5619
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: Cox Texaco Thoughts
Thanks for this info Fred.
Appreciated.
Greetings GG.
All the props that you mentioned are available from Master Airscrew they call their G/F Series.
If you favor a different flavor, please let me know.
I don't think wood is available in the smaller sizes, except perhaps the auction sites.
I have a large order coming from Cox Int'l that includes an 8x4. Perhaps too much pitch?
Probably should have ordered more gasket/rebuild kits.
Thank you.
Scratch
Appreciated.
Greetings GG.
All the props that you mentioned are available from Master Airscrew they call their G/F Series.
If you favor a different flavor, please let me know.
I don't think wood is available in the smaller sizes, except perhaps the auction sites.
I have a large order coming from Cox Int'l that includes an 8x4. Perhaps too much pitch?
Probably should have ordered more gasket/rebuild kits.
Thank you.
Scratch
Scratch049- Bronze Member
- Posts : 55
Join date : 2018-08-17
Age : 86
Location : South Carolina
Re: Cox Texaco Thoughts
well poo....thanks George
fredvon4- Top Poster
-
Posts : 4009
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas
Similar topics
» Cox Texaco and Texaco Jr. built with Kustom Kraftsman's parts.
» Cox Texaco and Texaco Jr. built with Kustom Kraftsman's parts.
» *Cox Engine of The Month* Submit your pictures! -May 2020-
» Texaco 049 and the Texaco 1/2A rules
» Drone registration
» Cox Texaco and Texaco Jr. built with Kustom Kraftsman's parts.
» *Cox Engine of The Month* Submit your pictures! -May 2020-
» Texaco 049 and the Texaco 1/2A rules
» Drone registration
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum