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Cox Texaco Thoughts

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Cox Texaco Thoughts

Post  Scratch049 on Mon Aug 27, 2018 9:47 am

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...
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Re: Cox Texaco Thoughts

Post  Cribbs74 on Mon Aug 27, 2018 10:10 am

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

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Re: Cox Texaco Thoughts

Post  GallopingGhostler on Mon Aug 27, 2018 12:00 pm

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.
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Re: Cox Texaco Thoughts

Post  Scratch049 on Mon Aug 27, 2018 1:06 pm

Many thanks for your help gentlemen.
Please bear with me as I am just learning about these engines.
Refugee from electrics. Very Happy
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...


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Re: Cox Texaco Thoughts

Post  Cribbs74 on Mon Aug 27, 2018 4:26 pm

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.
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Re: Cox Texaco Thoughts

Post  GallopingGhostler on Mon Aug 27, 2018 7:20 pm

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.
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Re: Cox Texaco Thoughts

Post  Scratch049 on Tue Aug 28, 2018 8:09 am

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. Smile
Thanks again for all your help.
Scratch...
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Re: Cox Texaco Thoughts

Post  GallopingGhostler on Tue Aug 28, 2018 8:34 am

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.
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Re: Cox Texaco Thoughts

Post  Scratch049 on Tue Aug 28, 2018 1:07 pm

Appreciate your input GG.
Nice to have someone with your experience helping.
Certainly I'll follow your advice regarding props and the rest.
Have to get out to the shed and put together a test stand/table.
I misspoke above.
Its the Sperry Monoplane that resembles the Q-Tee. not Sperry messenger.
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Re: Cox Texaco Thoughts

Post  fredvon4 on Tue Aug 28, 2018 2:11 pm

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/

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Re: Cox Texaco Thoughts

Post  GallopingGhostler on Wed Aug 29, 2018 5:02 am

fredvon4 wrote: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/

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.
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Re: Cox Texaco Thoughts

Post  Scratch049 on Wed Aug 29, 2018 8:28 am

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. Doh!
Thank you.
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Re: Cox Texaco Thoughts

Post  fredvon4 on Wed Aug 29, 2018 11:42 am

well poo....thanks George
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Re: Cox Texaco Thoughts

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