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September-2020
sosam117's

"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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"Rodd-O-Gyro"

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Post  Brenda on Fri May 01, 2015 10:24 pm

roddie wrote:My wife (God bless her soul..) comes down into my workshop and notices the Rodd-O-Gyro for the first time.. "What's this"? she asks.. "Oh.. just something I've been working on" I reply.. She picks it up.. and exclaims.. "it's heavy"... Shocked Shocked Shocked Laughing (thanks for the words of encouragement hon..) Rolling Eyes

You out to prove bricks can fly if you apply enough thrust? lol!
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Post  roddie on Sat May 02, 2015 10:48 am

Brenda wrote:
roddie wrote:My wife (God bless her soul..) comes down into my workshop and notices the Rodd-O-Gyro for the first time.. "What's this"? she asks.. "Oh.. just something I've been working on" I reply.. She picks it up.. and exclaims.. "it's heavy"... Shocked Shocked Shocked Laughing (thanks for the words of encouragement hon..) Rolling Eyes

You out to prove bricks can fly if you apply enough thrust? lol!

Were you and I ever married? Laughing

I got some odds and ends done over the last day or two. The gear struts were just pre-bent ones I had for the previous photos.. and were 5/64" (.078") music-wire. I bent-up a new gear of 1/16" (.062") wire and cut 1/16" ply-bracing for mounting to the firewall. This will make it easier for bushing the wheels I plan to use.

"Rodd-O-Gyro" - Page 3 5-1-1510
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Post  Oldenginerod on Sat May 02, 2015 11:01 pm

roddie wrote:
The rotor-blades..  Huh...  Here is where I'm unsure when using conventional propellers; whether to mount them facing into the airstream.. or away from it. My thinking is; to orient them where they will be "more" resistant to turning. This may seem to be a strange approach.. but I want them to "catch" the wind at a given AOT to provide lift. I don't know whether facing toward or away will create the most resistance in a freewheeling configuration... or whether the contra-rotating props will even work. I've tried to design this thing to easily try an infinite number of configurations. It only needs to become airborne.. and I'll consider it a success.
I'll probably end-up with a tether-car!! lol!

The rotor blades are wings, so to gain the most lift they need to have the convex side facing up to provode lift.  It's not the pitch of the blade that provides lift, but the airfoil (aerofoil in my language) section as it passes through the air.  The lower side, being concave, would make better use of the airflow to be able to spin the "wing" through the air at maximum speed, providing the greatest lift from the airfoil section.  So Roddie, from your pictures, I would suggest that the rotors would be far more efficien in providing lift if turned over the other way.

Rod.
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Post  roddie on Sun May 14, 2017 3:31 pm

Now that I have some parts to assemble more reed-valve engines.. I hope to get back to this project. I'd gotten a lot of it built... when I was avidly working on it last. I'm not going to fuss much further with my unproven theories. I need to try to balance it for a C/L lead-out connection.. and see if I can get it off the ground. Stay-tuned.. Laughing
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Post  roddie on Fri Apr 10, 2020 7:58 pm

I've been thinking about model-projects started.. and stalled. Wanting to re-start some. Smile Thought I'd revisit this design. Then I had another thought.. Shocked  Maybe you'd like to join me in an obscure experiment in U-control auto-gyro design!! Eyebrows Eyebrows

It's unfamiliar territory.. ripe for more experimentation by brilliant minds like ours..  Very Happy

Look!



I want that plan/lay-out for one of my COX ENGINES!!! Small Cox Logo
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Post  rsv1cox on Sat Apr 11, 2020 7:05 am

Top of the page, my first thought...……..Brenda's back. But no, May 2015.

Enjoyed the video. Wonderful, flat terrain, plenty of room, distant trees. Not West Virginia.

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Post  Ken Cook on Sat Apr 11, 2020 9:05 am

Roddie, somewhere amongst the items I have hoarded, there's a gyro article that uses the crankcase and crank of a Cox .049 for the rotor blades. I will take a look and see if I can post them. Since I've been on Coronacation, I've been just throwing things out left and right so I hope I didn't toss them. I have saved so many plans and boxes of models I've built, for years. I opened up the bag and dumped it all to make room in a double closet that stored this stuff. When do you really know that you've owned something long enough? Planes that were wrecked that have been sitting in the corner, well they went too. Sad, but I have to make room for the new.
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Post  Cribbs74 on Sat Apr 11, 2020 10:11 am

Well done Ken, it sometimes isn’t any fun throwing things away, but you are better off in the long run.

Nice video Roddie, that thing actually flys really well for what it is.
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Post  akjgardner on Sat Apr 11, 2020 11:04 am

Thats Pretty Cool Roddie, I'd line to make an RC one
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