- Aug 2, 2010
- Cartersville, GA
- Owned Brantly B-2b/Fly Kitfox III/Mini-500b
- Total Flight Time
I see the special "flex-coupling" for the T/R driveshaft in that same picture, right in front of the skate thingy. I have made some decisions on how I will configure my shaft so I will start another thread for the details and logic that brought me to my decisions. The helicopters that really confused me are the Robinsons.??? They have a long shaft that has no intermediate supports at all? The one bearing that is between the T/R gearbox and upper sheave is FREE to move radially in all extremes. It seems to me that it offers no support at all. I think it just acts as a damper to keep shaking from starting or worsening?
That's a NO Flex in that picture. Your way over thinking things again. Our moreflex works well and I feel very safe with it. You can spend more hours and time and material trying to reinvent the wheel, glad your spending your money doing it. I'm going flying you can reinvent the wheel again!!!
You have one way of thinking, I have another. My way is to look to existing successful designs for understanding and following the lead of others. You say 1 Morflex works very well. That's only because it hasn't broke YET.
I have a junk extra driveshaft and the parts laying there on the floor. Zero $. One extra Morflex is all I will have to purchase (and bolts).
I intend to fly my helicopter to work many days, to Florida sometimes, and up in the mountains of Tenn and NC. Not just a few miles to my buddy's house.
The FACT is...your shaft is bowing in the 2' section from the front bearing support to the pinion input. Is that OK? Maybe so. Who knows? I do know that you can bend a piece of aluminum back-n-forth a few times and it will break. Your driveshaft is being bent back and forth. How long will it be before it fatigues? Who knows?
The ONLY thing that will be bending back and forth on my setup is black rubber donuts which are designed for that purpose and are rated to 6000 RPM with a 2 degree misalignment. My long shaft and short shaft will be 100% straight 100% of the time.
...By-the-way! The flipped front pinion bearing and 2-row angular contact rear bearing setup (which you claimed I was too stupid to see it couldn't be done) worked out perfect and was very easy to do without modifying the case or anything else. Just made a front spacer out of the unused outer cup race and shortened the inner spacer.
You can have them..They are the upgraded pitch arms from Revolution.
I'll ask John what there worth and I'll give you a deal.
If I'm not down at the shop, John can send them to you....
OK John. I'm pretty sure you are right about everything...
Glad I could help...Fly safe
Good Day John and Kevin,
The pitch arms and backing plates you sold me has just arrived. Thanks John for brokering the sale, and shipping me the items to down-under.
I have also received my first MH-1 spare part from John, to use on my Skeeter Jr. It's an increased size main drive gear, better suited to the Yamaha engine RPM range. Thanks for that as well John.