To Close For Comfort! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-06-2016, 09:41 PM   #1
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To Close For Comfort!

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Starting new DLE 35ra. After several flips it fired up. Just as I was moving away from front of the engine, it suddenly "popped" (backfire sort of, maybe??) and sheared all 4 prop bolts. Yes, prop was balanced, and yes prop bolts were tight.
Anyway, fortunately I had moved far enough out of the way when the prop came off it just caught me on the upper right arm. I have one lovely, swollen bruised bicep but nothing else. Darn lucky.
Anyone had the prop bolts shear on their engine. Wondering about re-tapping for one size larger bolts. I now have put a bolt with washer on the end of the prop shaft with the hopes that if this ever was to happen again the washer would stop prop from departing! Any thoughts on doing this.
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Old 07-06-2016, 10:19 PM   #2
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Re: To Close For Comfort!

Son-of-a gun!!! You aren't the first one to report a problem like this. But it's still a good to bring to bring it up to remind all the others. Wow. Scary!!!
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Old 07-06-2016, 11:45 PM   #3
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Re: To Close For Comfort!

Wow! You are not having much luck with this motor are you? As far as putting the bolt on the main hub it will not hurt anything but you will not be able to put any spinner on it. I should touch wood but I have never had a prop even come loose.
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Old 07-07-2016, 09:44 AM   #4
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Re: To Close For Comfort!

Ouch! new to gas this year and same engine, never had a back fire or anything lucky I guess. Oh, and funny as it sounds I use a cheap paint roller to flip the prop to start it instead of my precious flying fingers lol. (I seen an older fella use one when i was a kid) Works great, and safe.

What kind of prop? and did it come pre-drilled or did you drill it? I ask because I heard if the holes in the prop are too tight on the prop bolts it can cause them to shear. you should be able to screw them on by hand then snug them up with allen wrench. (again, that's what i read on the net, I drilled my own with a prop guide and so far so good)

Of course if it back fired, none of above may matter too much, not sure.
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