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Geoff_H

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Geoff_H last won the day on April 30 2017

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About Geoff_H

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    Well-known member

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  • Aircraft
    Mooney
  • Location
    Sydney
  • Country
    Australia

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  1. The prop wash comes from the nose wheel. From memory the net was just behind the nose wheel and two ropes with poles pulled it up when airborne and lowered it as appropriate. Cannot remember details, old age has set in, but I will do it to the cozy if I ever finish it, very unlikely.
  2. I have seen a design of a net that was lowered and was in a position to protect the prop on landing. If I ever finished the cozy I was going to install one
  3. The Bede 5 had a similar drive system. I expect that it has been solved in this aircraft. The long not so stiff drive shaft with a high inertia prop at one end and a pulsating engine on rundown broke the tailshaft. Solved with a one way sprag clutch. Look for vibration problems.
  4. Two of my test pieces. Glued together with 5minute epoxy, and clamped for 24 hours. I couldn't separate them with a hammer. I was surprised at the strength. I will make the flaperons in nylon carbon and epoxy, 12 inch a piece and glue them together. I am in error in no welding in a previous statement, the exhaust will be welded.
  5. My printer seemed like a bargain. Unfortunately it was the end of a design that was crap, a new design followed. To print the more exotic materials I had to redesign significant parts of it. It now has a water cooled high print temperature. It took nearly 2 years of design, build and redesign over and over again to get to where it is. The effort is now paying off. The advantage of 3d printing is that I do not have any need for welding. Even the engine mount will probably be an exotic high temperature material
  6. When I was learning to fly around 1980 I was taught how to swing a prop. Safety and getting out of its way were important. Prop swinging does not seem to be taught these days. I have needed to start my engine several times, the guys doing it for me were much younger than me. I had to teach them. It took 5 minutes.
  7. The more that I do the more I get amazed with what I can do. My flaperons look like being 3d printed
  8. Only steel part is the rod, all else either nylon or carbon Nylon.Tyre has 50 psi in it, held ok for a month
  9. Hey the bond between layers is welding in a most controlled manner. I have.made wheels amd forks etc. Interlayer strength is ALWAYS tested. You wouldn't believe the testing method, crude to say the least. The layers are hit with a 10 pound hammer in a manner that puts shear stress on the bond. However one must know how to print to get the best results. I will send a picture soon. I am so impressed with printed parts that the engine frame will be 3d printed.
  10. Maybe you could make joints for the aluminium using 3d printed joiners. Each time would be round and secured by a pop rivet. Using Nylon infused with carbon the joints would be light and strong. Each joiner would need post printing preparation using a reamer in each "hole". A printer could make around 3 joiners per day, probably as fast as they could be used.
  11. I have used it extensively in industrial applications. It works great, but I want to use it in my project. I am just wondering about the consequences of using in an aircraft. Would anyone use it as a locking device for wheel retaining nuts?
  12. Has anyone had experience using Loctite style locking of aircraft bolts? What type of locking did the Loctite style glues replace? Nylon, metal crimp, wire, split pin?
  13. I have sent mine back to the Bose at Silverwater. They fixed them for free
  14. Years ago landed a Mooney with one brake locked on. When the speed dropped to around normal braking speed the locked wheel took over and the craft ground looped. It stopped very quickly indeed. Wheels going sideways can do that. Assuming that one brake is working, quite possibly so, then maybe just applying both brakes will result in a ground loop stop.
  15. Actually as a general rule speed harmonics tend to reduce dramatically as the number of cylinders increases. I remember being taught in 3rd year of degree that a V12 was regarded as the first "fully" balanced engine, well the vibrations were considered insignificant. I don't know about this engine but I am not about to get the books out to calculate the effectiveness of this configuration. Interesting to note that there is a theory that a 'square 4" with contra rotating shafts should be considered extremely well balanced,. mmmm how heavy would that be?
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