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cox 049 endurance record?
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Re: cox 049 endurance record?
I agree with Roddie, simple is better.
JPvelo- Diamond Member
- Posts : 1969
Join date : 2011-12-02
Age : 56
Location : Colorado
Re: cox 049 endurance record?
Sounds awfully interesting. I have to admit, and y'all know it too, I'm one of the known slackers. Though I did well in the Reed Speed contest and the Traveling prop and Engine, and participated a couple of times in the Tach Race. So maybe there's hope for me, let's see what y'all come up with.
Rusty
Rusty
_________________
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...and never Ever think about how good you are at something...
while you're doing it!
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RknRusty- Rest In Peace
- Posts : 10869
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Location : South Carolina, USA
Re: cox 049 endurance record?
JPvelo wrote:I agree with Roddie, simple is better.
Yes.. and I hope that this gathers more interest. Perhaps the event should be re-named with "duration" being the key element.. rather than endurance. It is a test of both though.. except we'd be lifting an airframe.. not running an engine on a test-stand.
How could this commence? Some research on airfoils and high-wing designs would be a good place to start. Actually; reading through info in the below web-link, will no-doubt help you to understand the concept.
http://www.charleslindbergh.com/history/sec/
Secondly.. researching the lightest-weight materials for the entire aircraft. A 41" wing-span, I believe would make a 1" scale subject if you were to build a scale-model Ryan M1. (I need to read more) There are PDF downloads available of the original airplane. Whether that scaling is the way to proceed depends totally on the entire design. Some interested modelers may choose to go with a more modern design. It doesn't really matter.. because someone will have an airplane that's able to fly for a longer period of time!
Years ago.. I put some thought into RTP (round the pole..) control-line flight, that involved building a center-circle fixture to replace the pilots' needing to turn with the model. It involved a fixed-line and naturally the other being movable. A "yoke" would need to be designed to make this possible. A level-only flight-path would simplify such a system.. with offsets built-into the model to help maintain line-tension while flying in calm-weather conditions. The models' extra fuel-weight would help early-on with the flight.. given centrifugal-forces, but once fuel-weight is consumed, the model must still be controllable. Relief-pilots would be fine too.. but it would be great to control/observe the flight from outside the circle.. especially if your design is capable of flying for several; 5,10,15 or more minutes! Scale-mileage could be calculated by your line-length too! There's a lot of plusses to a an event such as this. Any one of us could have our own little place marked in the Cox-engine/powered-model record-books!
Re: cox 049 endurance record?
I had a TD on a Brodak 1/2A Pathfinder which would easily do the full pattern and more. I could achieve 10-12 minute flights without even blinking an eye. If your looking for endurance, set the time high. 15 minutes is nothing in terms of endurance.
Ken Cook- Top Poster
- Posts : 5414
Join date : 2012-03-27
Location : pennsylvania
Re: cox 049 endurance record?
No kidding. I'm not going to say what I'd build, but I promise you I can take a Snickers or two out there with a lawn chair and put up a flight that will be competitive.
Is it going to be any Cox .049?
Rusty
Is it going to be any Cox .049?
Rusty
_________________
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
Re: cox 049 endurance record?
RknRusty wrote:
Is it going to be any Cox .049?
Rusty
I's say yes to that.. (and maybe the .051 too..) Modify it any way you like.. but I wouldn't go for any high-power mods. I don't know what size the venturi-diameter is on the Texaco reed-valve engine. Is it the standard Bee's .062"? Maybe clone a Texaco-configured engine.. and compare the bench-run times/fuel-consumption with a standard Bee using the same conditions/variables.. (prop/fuel/temp.. etc.) You can drill a hole in the side of an old spare 5cc tank and run your feed-line through it for connecting to a larger fuel tank. The postage-stamp and horseshoe backplates would be easier to run a fuel-line to a large tank.. but have larger venturis than the Bee-engines.. therefore, they might not be an economical choice for fuel-economy.
I doubt that a rotary-valve engine will achieve the economy of a reed-valve.. but who knows? Maybe a Medallion could? It would probably be an advantage to use a fine-thread NVA where possible.
Re: cox 049 endurance record?
After a little research.. it seems that the Cox Texaco (8cc tank)/Texaco Jr. (5cc tank..) do have a smaller venturi than that of the standard Bee engine's .062" size. How much smaller I don't know. Cox International (Bernie) or EX Model engines (Matt) could tell us for sure.
Maybe one could experiment with an old spare Zamac Bee backplate.. by reducing the outer air-intake diameter. One way to do this would be to drill some smaller "subject-diameter" holes (.050", .047" etc.) near the edge of a sheet of .005" sheet-brass and pop-out a disc using a standard paper hole-punch, then attach/glue the disc on-center over the backplate screen. There are other ways to do it.. but you need to be mindful not to close-off the needle-valve's spray-hole if for instance; you choose to "fill" the backplate's air-hole, then drill-out the filler material.
I also looked through the CEF "Cox Cylinder Identification" page.. HERE.. and it appears that the Texaco engine does not use any unique "porting" in its cylinder. There wasn't a cylinder "number" listed that was specific to the Texaco engine either.
So.. if one wanted to configure a Texaco "clone" engine; they'd need to start by providing/making the correct size air-intake, obtaining a correctly-ported cylinder, obtaining a 5-fin glow-head, a 7" x 3.5" prop.. and a freshly re-set ball/socket joint on the piston/rod. As far as "fuel" is concerned.. that's anybody's guess.
Here's some really cool info I found when searching Cox Texaco Fuel through Google. It naturally deals with "Free-Flight".. but provides some VERY interesting info on how one man and his dad set up their engines/airplanes, model-weights, fuel/props used.
http://scamps.homestead.com/Texaco_Secrets.pdf
Maybe one could experiment with an old spare Zamac Bee backplate.. by reducing the outer air-intake diameter. One way to do this would be to drill some smaller "subject-diameter" holes (.050", .047" etc.) near the edge of a sheet of .005" sheet-brass and pop-out a disc using a standard paper hole-punch, then attach/glue the disc on-center over the backplate screen. There are other ways to do it.. but you need to be mindful not to close-off the needle-valve's spray-hole if for instance; you choose to "fill" the backplate's air-hole, then drill-out the filler material.
I also looked through the CEF "Cox Cylinder Identification" page.. HERE.. and it appears that the Texaco engine does not use any unique "porting" in its cylinder. There wasn't a cylinder "number" listed that was specific to the Texaco engine either.
So.. if one wanted to configure a Texaco "clone" engine; they'd need to start by providing/making the correct size air-intake, obtaining a correctly-ported cylinder, obtaining a 5-fin glow-head, a 7" x 3.5" prop.. and a freshly re-set ball/socket joint on the piston/rod. As far as "fuel" is concerned.. that's anybody's guess.
Here's some really cool info I found when searching Cox Texaco Fuel through Google. It naturally deals with "Free-Flight".. but provides some VERY interesting info on how one man and his dad set up their engines/airplanes, model-weights, fuel/props used.
http://scamps.homestead.com/Texaco_Secrets.pdf
ian1954- Diamond Member
- Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England
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