Fly Boss Posted February 27, 2016 Report Share Posted February 27, 2016 The black leading edge of my propeller blades have nicks in them after 977 hours on it. These are the standard nicks from general use. I'd rather not send it off for repairs, so i'm wondering: 1. Can that black strip be removed and a new one put in by the owner? 2. Can you use an epoxy to fill the holes and then sand and paint the leading edge? 3. Would minor repairs like in #2 impact the weight characteristics of the blades? Thanks. Danny N860LS Link to comment Share on other sites More sharing options...
CT4ME Posted February 27, 2016 Report Share Posted February 27, 2016 Flying from some dirt/sand/shell strips in Mexico has given me a few nicks, on 2 different CTs. Some I've been able to file with a fingernail file, or equivalent on a leatherman. Others I've patched with JBWEld/quick. Most recently I've used Bondic, that plastic that cures in 3 seconds of UV light. It seems to work perfect. 'Not sure about replacing the strip, but assume it can be done at the factory. I feel like I've picked up a few nicks probably from doing runups on concrete taxiways as well. Because of that I've started using a run up rpm that is less more like 3000 or 3500. Link to comment Share on other sites More sharing options...
Anticept Posted February 27, 2016 Report Share Posted February 27, 2016 Per Neuform: Minor damage to the coloured top layer can be repaired by qualified persons on their own accord. The surface resin needed for this can be obtained from NEUFORM in small quantities. All other repairs should be done by NEUFORM or an authorized partner. http://www.neuform-propellers.com/_downloads/pdf/propellermanual.pdf And technically yes, this will affect the prop weight if you cake the paint on, but touch up jobs won't have much effect so don't worry about it. Link to comment Share on other sites More sharing options...
Runtoeat Posted February 27, 2016 Report Share Posted February 27, 2016 I'm a long time user of JB and have been using the 5min. "Quick" the last few years. I was going to buy more JB 5 min. just to keep around the shop. Looking at the products, I noticed that Loctite also offers a similar product. The Locktite "quick" had better PSI rating so I bought it. This is close to the JB "original" JB "original" = 3960 PSI JB "quick" = 2424 PSI Loctite "quick" = 3355 PSI http://www.loctiteproducts.com/p/epxy_weld_t/overview/Loctite-Epoxy-Weld-Bonding-Compound.htm Has anyone used the new "light activated" bonding material? Curious how well this performs. I've seen good and bad reviews. Link to comment Share on other sites More sharing options...
CT4ME Posted February 27, 2016 Report Share Posted February 27, 2016 I've used Bondic to seal/fill minor nicks. Thin layers cured on top of each other, then filed to match contour. So far so good. I think the reviews are a matter of expectations. It's not a "glue" yet people want to use it like it was super glue. I think it works great for filling or building up Link to comment Share on other sites More sharing options...
Tip Posted February 27, 2016 Report Share Posted February 27, 2016 I think that you are due for a prop inspection @ 1000 hours. Maybe that number has changed? FDUSA had been doing them. Link to comment Share on other sites More sharing options...
Anticept Posted February 27, 2016 Report Share Posted February 27, 2016 Its 1500 now. The manual that I linked has it. Link to comment Share on other sites More sharing options...
Runtoeat Posted February 27, 2016 Report Share Posted February 27, 2016 Tim, thanks. I'll check out the Bondic. Link to comment Share on other sites More sharing options...
Tip Posted February 27, 2016 Report Share Posted February 27, 2016 Thanks Corey, What's the time on the gearbox? Link to comment Share on other sites More sharing options...
Roger Lee Posted February 27, 2016 Report Share Posted February 27, 2016 1000 unless you use 100LL al the time On the prop nicks. If they are tiny they may only need a little fine sandpaper dressing up. Don't make them big just so you can add some filler. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted February 27, 2016 Report Share Posted February 27, 2016 I think the Kwikweld is more than sufficient. If you take a 2424psi hit to the prop, you probably need a gearbox teardown anyway. Using the longer curing product will make the job messier and more difficult. Link to comment Share on other sites More sharing options...
Fly Boss Posted February 27, 2016 Author Report Share Posted February 27, 2016 Thanks all. I will get some JBWeld quick to use. This is the original prop, so it will come to its 1500 inspection soon enough. Link to comment Share on other sites More sharing options...
Al Downs Posted February 28, 2016 Report Share Posted February 28, 2016 There is also a 5 year time on prop inspections, Cost of the inspection is about $1100 with all the shipping and normal condition. I just did three of them. One on a CT and 2 on Ikarus. Pay attention to the mounting bolts, I found 2 of the 6 mounting bolts were bent on one of them. This was on an Ikarus. No idea how this could happen as no abnormal events in its life. I have a video to show the bent bolts but don't see a way to attach it. If someone can tell my how to post the video I will do it. Link to comment Share on other sites More sharing options...
Anticept Posted February 28, 2016 Report Share Posted February 28, 2016 Drop it on youtube and link it. Videos are too large for this forum. Link to comment Share on other sites More sharing options...
Al Downs Posted February 28, 2016 Report Share Posted February 28, 2016 I will give it a try Link to comment Share on other sites More sharing options...
Al Downs Posted February 28, 2016 Report Share Posted February 28, 2016 Here is the link. Hope it works https://youtu.be/ZO8xsjxlP2o Link to comment Share on other sites More sharing options...
Anticept Posted February 28, 2016 Report Share Posted February 28, 2016 Yeeeep thats a bent bolt. Someone overtorque it? Link to comment Share on other sites More sharing options...
Al Downs Posted February 28, 2016 Report Share Posted February 28, 2016 I don't know how it happened but there were two of them and no record of the prop ever being removed. Link to comment Share on other sites More sharing options...
FastEddieB Posted February 28, 2016 Report Share Posted February 28, 2016 Yeeeep thats a bent bolt. Someone overtorque it?Weird. Does overtorquing typically bend bolts? I can see stretching them, but bending is harder for me to envision. Link to comment Share on other sites More sharing options...
Anticept Posted February 28, 2016 Report Share Posted February 28, 2016 Stretched bolts can bend easier. I'm trying to figure out how the bolt bent any other way with only 2 of the 6... Link to comment Share on other sites More sharing options...
Roger Lee Posted February 28, 2016 Report Share Posted February 28, 2016 Bolts should not bend due to torquing. That's a grade 8 bolt and they don't stretch easily. They usually bend if you fail to have the anti torsional lugs in the prop hub that usually go through the prop flange. So either there were no torsional lugs or it had a strike or that video has an uneven wall. Flat on a piece of glass or something really flat would have been better. Link to comment Share on other sites More sharing options...
Jacques Posted February 28, 2016 Report Share Posted February 28, 2016 . That's a grade 8 bolt and they don't stretch easily. ???? not sure if they are metric like mine , Grade is 8.8 (stamped on head) which is Grade 5 in US http://elginfasteners.com/wp-content/uploads/2014/01/strengths.gif Link to comment Share on other sites More sharing options...
Anticept Posted February 28, 2016 Report Share Posted February 28, 2016 As Jacques said... grade 8 and class 8.8 are two easily confused, but totally different things Class 10.9 is ~equal to grade 8. As for bending due to torquing: they shouldn't, but as said, how else could they have bent O.o . He didn't say if the inserts were deformed, and I would expect those to bend too in a prop strike. Link to comment Share on other sites More sharing options...
Al Downs Posted February 28, 2016 Report Share Posted February 28, 2016 These are the 8.8 metric bolts and there is no history of any prop damage or even being taken off. The video is on a flat counter top and the are bent enough to be seen without rolling them on a flat surface. Difficult to see the bend in a photo but can see they wobble when they roll. This prop was on an Comco Ikarus C42E with Rotax 912 ULS. Link to comment Share on other sites More sharing options...
Anticept Posted February 29, 2016 Report Share Posted February 29, 2016 On the other hand, maybe they were made of fine quality chinesium, and were even pre-bent for you! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.