crashedagain
Flight lieutenant
uhh, how do i keep it in the air?
Posts: 55
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Post by crashedagain on Dec 10, 2007 4:44:54 GMT 1
Hey Jim, The prop saver works just fine with rubber bands. Every so often when i have to change the bands, i may have to double them up to fit snugly (depending on their size). There are times when i don't properly tighten them up, and upon takeoff roll, they may bust loose, but it always happens upon a takeoff, never in flight. If you use the rubber band method and you do a hand-launch (PAY ATTENTION TO THIS ADVICE!!!) grab the SC by the tail, hold it above your head so that the Prop is almost like a Helicopter prop above your head. You may now throttle up to see if your rubber bands are holding. At this point of testing the strength of your rubber bands, please DO NOT look at the moving mechanism as tempting as this might seem. You see, if they were to break and that prop comes loose, you do not want the spinning, SHARP prop to come anywhere in the vicinity of your face or anyone else's for that matter . After a few seconds of full throttle, if all is well, you may continue your hand launch. The first time I tried the prop saver and the rubber band failed, the prop hit me on my pinky knuckle and i'll tell you... that thing hurt like a (insert your favorite word here ) . But i do some dumb stuff pretty regularly... that's why my wife is an ER nurse. ;D . Please use common sense and safety when using these non-traditional methods. RC Flying is only as safe and as fun as WE make it. Colin.
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Post by davemac2 on Dec 10, 2007 4:50:42 GMT 1
I'm afraid I don't get this. The nut is tightened on the saver, and the rubber band cause the prop to follow the saver? I understand that concept but it doesn't seem like the rubber band could keep the prop at those speeds. Jim If the rubber band is tight enough, then yes it should transfer the torque to the prop ok. In motion, it may stretch a bit such that it is twisted, but it should still work. Usually a standard plumbing o-ring is normally used because it is lower stretch. The motor shaft usually protrudes thru the prop saver into the base of the prop maybe a 1/16 to 1/8" to keep the prop centered. You normally don't want to have the shaft extend all the way thru the prop center because the idea is that if the prop hits something, the hit blade can move forward or back a bit too to avoid breakage. dave mc
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Post by pvtzemerak on Feb 13, 2008 23:48:56 GMT 1
cool!
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Post by spar on Feb 15, 2008 2:48:35 GMT 1
They do work and are essential on RC airplanes that don't have landing gear.
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Post by cvrcmember on Jul 7, 2008 18:25:14 GMT 1
Thanks, good idea! ;D
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cratermaker
Flying officer
Controlled Crash To Pieces
Posts: 32
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Post by cratermaker on Jan 27, 2009 22:42:44 GMT 1
I agree with Cloud9
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