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I was thinking about full size since I'm tired of working such in a small scale. I'm getting older too and I can't see the smaller stuff very well anymore.
It's my intention to tow it for testing on a trailer that I pull behind my truck. It's going to be more expensive this way but I feel that there will be better results in the end. This will give me a change to make sure all components are turning the right way and the control input is correct. I don't need a big thrill at my age if something goes wrong.
I just got a small mill for my shop and that took a lot of time to set up because of my bad back. I hope to catch up with the project now that exercise is over...lol.
PS Have you seen the MC4 project lately? Man, I think that little bird is cool. :-)
Saddly the Mc 4 was returned to the Museum, Reids wife took him to the cleaners, He's doing a project in Washington , A brantly/Robie two placer.
I have designs for an 8 place tandem rescue helicopter that will be started soon I hope.
My back is still fubar, I can be vertical for 20 minutes, After that horizontal for a day or three. Young is over rated & old sucks. I'll be happy with a little thrill.
I feel for you and your back problem. I'm in the same boat as you with the prolonged standing so I use a mechanics stool to slide around my shop. All heavy lifting is done by mechanical means just like last week with my milling machine. All my work benches are built around 28 inches high instead of the normal 32 inches for use with my stool. I'm not going to let my injury rule my life!
I didn't know you were interested in tandems enough to design and build one...good luck! The more I work on my project the more that I discover the differences between gyros and helicopters. Not to mention, the differences between tandems and their configuration but you know much more than me on the subject.
I have plans from the internet for the Mc4 and it is not as complex as I had originally thought. The plans gave me many ideas on the control configuration and what doesn't need to be included on the gyro. I'll confirm this when I start tow testing.
The design fills a nitch, a fuslage of honeycomb palet ,walls ,bulkheads all parts interchangable on the gearboxes ,blades & controls, so the parts count & tooling is reduced, Need to find a pt 6 for a powerplant,
Need to see the Doctor in my wifes familyin China, Bones & Back injurys are their speciality (1300 years worth) but the County Cubical Hamsters have a hard on for me, Keep messng up the retirement process, Going on 5 years (I think it has to do with the costs of launching contract fire helicopters to a bad fire in 2008?? & the Sheriff dept was not on the clock)
You had recommended that a solution to my gearbox problem may the use of a Honda final drive differential. I have been looking at a GL1800 differential but I have a question about the lubrication. Since it will run on it's side, what changes would I need to make to insure good lubrication. By looking at the picture the breather would need to rotated by 90 degrees along with the filler plug. The drain plug can be used as a chip detector also.
These are just thoughts and questions that I was milling around.
I've spent the last weekend cleaning and modifying my gearboxes.
The modifications were changing the air vents by 90* and changing the fill cap into a sight glass.
I was also trying to determine the amount of force required to turn the shaft. It measured 15 pounds but I have little confidence with this number. A torque wrench was used to turn the input shaft where it measured 15 pounds.
The combination of two motorcycle gearboxes to couple the front and rear rotors has presented some issues. The drag created by the mating of the gearboxes has too much drag to be started by a normal running take off. At this point, this problem may require partial power.
My major concern is without addition power a tandem gyro may not be able to fly without power to the rotors.