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Prop Crack

Join
Jun 4, 2018
Messages
4
Likes
0
Age
28
Loc
Kansas City
#1
I was doing a post flight inspection of my spark today, and I noticed a slight crack on the trailing end of the prop close to the root. See attached pic. I think this happened as a result of a minor crash I had indoors when I first bought it. I’m surprised I didn’t notice it sooner. I’m worried the reason I missed it is because it wasn’t there previously, and the crack has propagated after 4 or 5 flights. Should I switch it out? I would hate to waste a prop like that, but it’s a no brainer if I am looking at a complete failure after a few flights. 10FD432E-B863-4625-B0EC-340B0F61711C.jpeg
 

maumau

Well-Known Member
Join
Feb 28, 2018
Messages
82
Likes
33
Age
62
#2
I was doing a post flight inspection of my spark today, and I noticed a slight crack on the trailing end of the prop close to the root. See attached pic. I think this happened as a result of a minor crash I had indoors when I first bought it. I’m surprised I didn’t notice it sooner. I’m worried the reason I missed it is because it wasn’t there previously, and the crack has propagated after 4 or 5 flights. Should I switch it out? I would hate to waste a prop like that, but it’s a no brainer if I am looking at a complete failure after a few flights. View attachment 5207
Yes trailing edges of props are more fragile than leading edges. And sometimes cracks are difficult to notice at once.
I had a couple of cracks like this and it's VERY easy to fix.
Just use a piece of scotch tape on the crack. Absolutely no change in behaviour and performances. I flew more than 100 times and the prop is still perfectly working.
MOST IMPORTANT: in case of slight crash undo all your props and check the small pieces that lock the prop into the motor. They are also very fragile and might break. In this case throw the prop away.
 

Jeplane

Well-Known Member
Join
May 26, 2017
Messages
110
Likes
96
Age
118
Loc
Dallas, TX
#3
Couple of thoughts come to mind:

- Props are too cheap to mess around with. They are really a small price to pay to protect your investment.
- Props can turn fast. At 2500 RPM in a prop airplane, the wingtips are very close to the speed of sound. Obviously, any cracks on the prop then can have disastrous consequences. Although with the Spark being a quadcopter, we do not have to worry as it is not that fast to begin with. However, once again, cracks are not something I would mess around with, it's just not worth it losing a drone because of it...
 

RENOV8R

Well-Known Member
Join
Jan 1, 2018
Messages
82
Likes
45
Age
58
Loc
St Thomas, Ontario, Canada
#6
Putting anything on a prop such as tape will cause it to become unbalanced. Maybe not quite so noticeable in smaller craft but in larger birds we actually use small pieces of tape to balance props. Putting a piece on Sparks prop may not cause any noticeable change in flight characteristics, but may slightly affect your video image.
 

John Harvey

Well-Known Member
Join
Feb 1, 2018
Messages
162
Likes
71
Age
63
Loc
Croatia
#7
The root of the propellor is where all the stress , load is generated. Any crack in this area will grow and the blade will separate, resulting in a Drone crash. Blades are cheap, best to replace immediately and protect your investment.
 

graywoulf

Just another propeller head
Premium Pilot
Join
Mar 30, 2018
Messages
749
Likes
381
Age
63
Loc
Millers Creek, NC
#8
Second chance box... LoL! I have to agree with all of the reasons not to continue using a cracked prop. Especially the RPM issue. I was thinking at first to use CA but CA is not stable for many plastics and certainly not any use where vibration and such is a factor. Did I learn a lesson? Yes I did. ;)
 

Eljay

Well-Known Member
Join
Nov 29, 2017
Messages
98
Likes
34
Age
48
#9
You definitely want to get in the habit of checking them out each time and replacing a prop if there's any hint of drama. Just carry spares and accept that you'll occasionally use them up.
 

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