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Old Jan 09, 2013, 02:17 PM
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Hi Gordon, I'm relieved to know I don't need to do a Usain Bolt to get the rotors up to speed! I'm not altering the control system as I want to get acceptably close to the original for the purposes of the build-off, so rudder/elevator it will be. I am making use of my lathe to produce what I consider to be a better bearing system and will attach the rotor mounting arms in a slightly different way. Essentially though it will be as designed. No doubt Mr Ellis, the designer, used materials and methods applicable to 1955, but we have more options at our disposal now. If I catch the A/G "bug" I may build a more advanced one in time. Thanks for your interest and the video.

Bob
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Old Jan 09, 2013, 05:00 PM
Beware of the cabbage
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London, England
Joined Jun 2005
486 Posts
GeeW, I like your video, but I don't think much of the pilot in your model, he doesn't seem very observant th what he's doing!

Raf_Bob, it looks as though you're already half caught by the A/G bug! Very interesting build and I look forward to seeing how i develops.
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Old Jan 10, 2013, 11:21 AM
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A bit more done on the rotor head. Next job is to assemble the arms to the discs. That will require a good degree of precision work. I'm devising a jig for setting it up.
After that, onto the model itself!
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Old Jan 10, 2013, 12:11 PM
SB-28 UK Display Pilot
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Make sure you have a way to shim the blades incidence. I normally adjust by one 1/64" ply at a time until I get the right result.
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Old Jan 10, 2013, 12:27 PM
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The plan asks for 3 degrees for the lower rotor and 4 for the top. I plan on jigging the arms to these angles before soldering to the discs. The resulting depth will be filled to render the discs solid before re-attaching to the bearings. I've yet to design the jig so my thinking cap will be on (if I can find it ). Great satisfaction to be had from building and problem solving isn't there?
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Old Jan 14, 2013, 10:26 AM
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Just to show I'm still working on the Contra-Gyro. Bottom rotor spider soldered up, top one to do. In this shot the disc is spinning rapidly and very smoothly but the flash has frozen the action!
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Old Jan 14, 2013, 10:58 AM
So I'M meant to be in control?
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Ilkley, West Yorkshire, UK
Joined Nov 2008
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That is really nice work, Bob - and it only goes to reinforce the notion that I would have not a cat in hell's chance of making one myself!
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Old Jan 14, 2013, 11:26 AM
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Originally Posted by Colonel Blink View Post
That is really nice work, Bob - and it only goes to reinforce the notion that I would have not a cat in hell's chance of making one myself!
Thanks colonel. Had I not bought a lathe for my son when he was much younger, I would probably not have attempted this. He left home, got married, as they do, and bought his own lathe. He now builds live steam locos! But, I still have the machine so wanted to put it to use. It was very handy for making a jig to set up the spider for soldering. Now off to the luxurious shed to work on the other one.
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Old Jan 14, 2013, 01:53 PM
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Head construction nearing completion. Now getting down to the woodwork.
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Old Jan 14, 2013, 02:23 PM
I like real wooden aeroplanes!
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Looks very technical! Nice work Bob.
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Old Feb 01, 2013, 02:04 PM
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With others getting well on with their builds, I think it's about time I showed some progress on mine. There have been several hold-ups including freezing weather and distractions into other projects, but I've made some headway. Building fuselage as a lower half which is easy to jig up and will form a foundation for the upper part. Hatch will fit into underside for which a magnet has been installed. Undercarriage will be detachable and will require tubes to be inserted across the front just behind the motor mounting bulkhead. Should proceed a bit more rapidly now. Much admiration for all that others have been doing.
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Old Feb 27, 2013, 12:39 PM
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Well, I stick to my threats so here is a photo of the machine to date. Lower fuz was built upside down in the jig. Hatch made and magnets installed on underside. Tubes for removable undercart installed and main legs bent up. I'm adopting (nicking) Georges idea here. The front undercarriage legs will be of lighter wire and set into tubes under the motor mount. That will have to wait until the nose block/cowl has been made. The motor is a 100 watt bell type. Absolutely no idea if this is right but from what I've read on here autogyros need more power than fixed wing aircraft. Only time will tell on that one. Beginnings of upper fuselage taking shape now. It looks a bit rough but should tidy up ok with a bit of persuasion! I wonder if anyone will notice my deliberate mistake with the rotor head Regret, no prizes!
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Old Feb 27, 2013, 04:31 PM
I like real wooden aeroplanes!
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South-west France
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Coming along nicely Bob. Mind you, you do have six "wings" to build!!
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Old Feb 27, 2013, 10:29 PM
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Nice to see someone building a Contra Gyro. I watched my father flying the original quite a few years ago.
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Old Feb 28, 2013, 11:45 AM
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Originally Posted by Farm Flyer View Post
Nice to see someone building a Contra Gyro. I watched my father flying the original quite a few years ago.
That's very interesting. When and where did this take place? Do you remember how well it flew?
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