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All Forums >> RC Airplanes >> Questions and Answers >> fixing prop
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fixing prop - 11/18/2009 1:28 AM   
cotman


 

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Status: offline 		Hi all
Bought a brand new 15x6 APC prop and dropped it. A chip came off it (see photo). Can it be repaired with epoxy or something else. Paid $13.00 for it and never even got to use it. Hait to waste the money....I'm cheap I guess. Thanks

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RE: fixing prop - 11/18/2009 1:31 AM   
bassmanh



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Status: online 		cotman,

hate to be the bearer of bad news but you would be wise to pitch it and buy another. a chip like that is just an accident waiting to happen.




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RE: fixing prop - 11/18/2009 1:37 AM   
j.duncker



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Status: offline 		Got to second the previous poster, bin it and get a new one.

Buuuut the APC prop construction involves tip to tip carbon reinforcement soooo it is prooopably OK but do you really want to risk one blade coming off at max RPM? Naaaah BIN IT!

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RE: fixing prop - 11/18/2009 1:49 AM   
ppkk



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Don't even think about it, $13 is not worth _______ (fill the blank with some possible things that could go wrong)

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RE: fixing prop - 11/18/2009 2:33 AM   
42etus



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Status: online 		Carefully clamp the prop in a vise with the hub sticking out. Now break off the damaged part. Seriously, it hurts to toss out a $13 prop that you haven't even used, but that's the safe thing to do. It might run WOT for years with out any trouble...........and then again it might not. Any kind of 'repair' would only make a questionable prop worse.
Paul

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RE: fixing prop - 11/18/2009 2:58 AM   
dignlivn


 

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I say Pitch it

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RE: fixing prop - 11/18/2009 3:08 AM   
oldvet70



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Status: online 		I agree toss it out. A damaged prop is just the cost of doing business in RC or Full Scale Aviation.

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RE: fixing prop - 11/18/2009 3:31 AM   
Gray Beard


 

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Status: online 		Not only toss it but always check props before you buy them. Some places have prop bins and they get beat up with just people looking through the bin for there prop size.

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RE: fixing prop - 11/18/2009 4:08 AM   
ro347


 

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RE: fixing prop - 11/18/2009 4:16 AM   
dgrant



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Status: offline 		Ditto what they said. I've seen for myself what a ticked/damaged prop can do. APC is nutorious also. They are a very stiff and brittle plastic/resin which is why they don't flex much, if at all... and are susceptible to shattering if the structure is breached.. exactly as happened with your prop.

They are GREAT props, and I own many of them... but I watched one shatter after a very slight ground-strike that barely nicked that prop. It threw a whole blade... and the blade left twisted the whole nose off the plane.. another reason why I don't like anybody standing inline with the spinning prop.... and the chances of that prop you have of throwing a blade right at the site of that nick is very likely. I won't use any APC thats had any contact with the ground, other then me setting it down. If it was wood.. you might stand a bit of a chance..maybe slight.... but still the APC.. no way man. Sorry.

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RE: fixing prop - 11/18/2009 5:02 AM   
ChuckW



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Status: offline 		Throwing $13 in the trash is minor compared to a crashed airplane or a prop blade sticking out of your forehead.


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RE: fixing prop - 11/18/2009 8:07 AM   
The Ghost



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Status: offline 		As every one has said. Ditch the prop, $13 is nothing compaired to a life. I had a $180 carbon fiber prop delaminate on one blade after only 2 mins of running.

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RE: fixing prop - 11/18/2009 2:04 PM   
Ed Smith


 

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quote:

Buuuut the APC prop construction involves tip to tip carbon reinforcement soooo it is prooopably OK but do you really want to risk one blade coming off at max RPM? Naaaah BIN IT!


The grey APC props, like the one in the picture, do not contain carbon. They are glass reinforced. The black Q40 props contain carbon but not "Tip to Tip" strands. The carbon in these is a chopped additive to the resin.

Any composite with chips in it is dangerous.

Ed S

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RE: fixing prop - 11/18/2009 3:01 PM   
proptop



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Status: online 		I would hate to recommend it, but...since the (slight ) damage in on the Trailing edge, it could be radiused out carefully, then re-balanced.

If the nick was on the Leading edge, I would say to definitely trash can the prop...but the nick is not that deep and it's on the T.E. and could be sanded out w/ 220-320 wet/dry sandpaper wrapped around a 1/2" dowel or a Dremel sanding drum...you wouldn't need to remove much material either.

I've seen more damage than that caused by a slip w/ an elec. starter.


BUT...to be on the safe(st ) side...maybe you should toss it in the trash? Like I said, I would hate to recommend that you try and "fix" it then have something bad happen when you try to run it.

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RE: fixing prop - 11/18/2009 4:06 PM   
daven



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Status: online 		I was thinking the same thing Proptop.

Being on the TE it might be ok, but I would still think it would be best to replace.

theres definately no way of trying to repair it with Epoxy that would be effective that I can think of.

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RE: fixing prop - 11/18/2009 8:44 PM   
iflircaircraft



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Status: offline 		Put it in a vise at the hub and carefully break both tips off!! Use the tips for epoxy mixers. Clean them off after each use and they will pay for themselves.

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RE: fixing prop - 11/20/2009 3:14 AM   
freakingfast


 

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quote:

ORIGINAL: iflircaircraft

Put it in a vise at the hub and carefully break both tips off!! Use the tips for epoxy mixers. Clean them off after each use and they will pay for themselves.


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RE: fixing prop - 11/20/2009 11:31 AM   
Luftwaffe Oberst



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Status: offline 		A new prop is always cheaper than a possible injury.


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RE: fixing prop - 11/21/2009 12:59 AM   
red head


 

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Status: online 		I sure hope you don't bring it to a field where I fly. Even the oil on my planes is worth more then $13.00. ENJOY !!! RED

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RE: fixing prop - 11/21/2009 2:07 PM   
eagledancer


 

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Status: offline 		the question is which is cheaper a new prop or a trip to get stitches i think the trip to the doctor is going to hurt your pocket much more then a 13.00 prop

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RE: fixing prop - 11/21/2009 2:26 PM   
jaka


 

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Status: offline 		Hi!
Being a model builder /flier for many years having made both my own carbon fiber props for pylon racing and modifying many commercial props for scale and sport planes, I say; just use a file and sandpaper and fix it! the cut is so small and It' s so easy to fix!!! Especially as the cut is in the trailing edge! No torque acting at that place!
But always balance the prop after you have fixed it!

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RE: fixing prop - 11/22/2009 1:06 AM   
cotman


 

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Status: offline 		OK guys.... I got the message.... I throw it away. Just thought I'd ask first. Thanks for all your advice

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RE: fixing prop - 11/22/2009 2:23 PM   
STUKA BARRY


 

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quote:

ORIGINAL: cotman

OK guys.... I got the message.... I throw it away. Just thought I'd ask first. Thanks for all your advice

A $13 prop is childs play!! try throwing away a $100 prop. I have the most expensive paint and epoxy stirring sticks available.

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RE: fixing prop - 11/24/2009 2:13 AM   
jester_s1


 

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Status: offline 		I would have used it. As one other poster said, sand it smooth so there's not a stress riser there and you've lost no strength.

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