ORIGINAL: tenacious101010
GREAT ! Looks like the purpose I posted this thread is paying off, for us beginners.
Just to clarify one thing, the 3rd time the prop came off, it went to the side, my flight kit was about 10 inches to the side just ahead of the line of prop rotation, the prop hit it, destroying my power panel, then richoched off and last I saw was it headed off to the left. I thought it want forward and over the house. My wife found it about 20 feet behind where I was, may have bounced off a nearby tree about 10 feet to my left. So you just never know what direction it might go. Please, make one of those nuts a LOCKNUT ! !
Buy a few spares too, in theory they are not supposed to be reused, but am sure when you feel the difference in the torque required to turn them decreases, discard it. I bought some from Home Depot, Lowes has them too. A great investment for about $1.00 each for stainless. After you are able to survive the prop, you can then perfect your tuning process.
Thanks again for all who have contributed to helping make it safe for others as they learn.
Denny
Hey Denny,
It sounds like you are using a lock "washer" in place of the lock nut that is supposed to be used. The Saito engines I own all came with two nuts to hold the prop on. The one you install first has a countersunk area near the threads which faces forward. The lock nut has a small protrusion that fits into the countersunk area of the first nut when you screw it on. This design is what helps lock them together.