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This is soooo not good!

garlandk

garlandk

100cc
I use 90 inch pounds of torque on my DA engines on carbon props. I have had two sheered props when I did not do this torque setting. As for Carbon fiber spinners and backplates... So far I have never had an issue with this, but I generally put a small bit of Loctite on the bolt for the first time. Never do it again after the first time. I snugged the bolt down and don't over tighten it.
 
Terryscustom

Terryscustom

640cc Uber Pimp
For 5" spinners I normally use the no limitz spinners from PAU. The other thing that I do religiously is use nordlocks on all prop bolts, I get them from mcmasters.
 
49dimes

49dimes

Damn I'm hungry
Rob. I have that same spinner and opted for the Mejzlik instead. Bunky made a good point about "indexing" the holes of prop and spinner. Also. You could tell the back plate was rocking back and forth.

Edit: I also use the Falcons...They are similar to the Mejzliks but a little less pricy.
 
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stangflyer

stangflyer

I like 'em "BIG"!
So I think I got things ironed out. Hopefully in a positive manner. Checked the prop hub and the bearing is perfectly great. Just as it came. Nothing to worry about there. After speaking with Dave today and expressing the complete story, It is concluded that the GP 176 just simply makes too much power with the Smooth Pipes and thus, the CF back plate failed. As many of you already know and I am just coming to the conclusion of....It's been said many times, that CF back plates just can't withstand the output of the larger motors. (Weird how my 157 is doing so well.) Whether it be heat or vibration or just pure grunt, they all seem to fail over time. I was lucky. Mine failed in the most optimal way possible. Thankfully it was caught before a second flight. It could have been catastrophic.

I called up the little gals at Tru-Turn and got an aluminum lightened back plate ordered. Cleaned up the threads on the prop hub with my tap, purchased new bolts and super strength washers. Threads cleaned and lightly oiled, then blown out. When the new back plate arrives, I will put that on the GP along with the 32x11 Falcon and give her a go around. I may at a later time opt to get hold of Chad at TDRC and order a brand new spinner assembly. Thanks Chris for the info.

I took some time this afternoon to double check the 157, and sure enough....all is well. I purchased new bolts for that as well along with new Nord Locks. Cleaned, dressed the threads on the hub and prop is back on. So, a little accomplished today.

Thanks to everyone for your input and insights. I do appreciate it.
 
stangflyer

stangflyer

I like 'em "BIG"!
49dimes said:
I bet you got anodized "purple"! It's a thang ya know. :laughing:See...made Xqai Chang Thang chucle.

Now let me fly it!!!!! PLEASE!!!!! PLEASE!!!!!!! PLEASE!!!!!
Click to expand...
No....actually just the aluminum back plate. Still want to use my CF nose cone. Ya know if'n ya want to fly this, ya first gotta progress past the "glow" (shudder) stage. I really can't risk slimy finger prints on my covering.
 
Bunky.F.Knuckle

Bunky.F.Knuckle

150cc
stangflyer said:
After speaking with Dave today and expressing the complete story, It is concluded that the GP 176 just simply makes too much power with the Smooth Pipes and thus, the CF back plate failed. As many of you already know and I am just coming to the conclusion of....It's been said many times, that CF back plates just can't withstand the output of the larger motors. (Weird how my 157 is doing so well.) Whether it be heat or vibration or just pure grunt, they all seem to fail over time. I was lucky. Mine failed in the most optimal way possible. Thankfully it was caught before a second flight. It could have been catastrophic.
Click to expand...

I think that it is stellar that you are digging into this with both feet. :)

But......................

There has been much discussion when it pertains to the 150cc and up engines pertaining to heat, CF backplates and CF props. Unfortunately, that type of discussion could blow up at a moments notice. Maybe not so here, but the potentiality is there. I've had the same thing happen to me, as you probably seen on that Mejzlik 30x12 prop I sent you to test. Had the prop on my 157 CSTS with a CF spinner and backplate. 4 min into the 1st flight, I heard something unusual. Killed the engine, and landed. Pulled the spinner cone and 6 bolts were loose. Everything was still warm, so I tightened everything up, let it all cool down, and proceeded to go fly again. Again, 4 mins into the flight, same deal. But, the same day, I tried the 31.5x13 Engel, and it was flawless. Made 2 full 10 minute flights. All was good.

I feel that RPM has something to do with it as well. But I made up a little rule of thumb, and I live by it. CF prop/CF backplate = No go. Wood prop/CF Backplate = YAY! Reason I say that is......... I ran a 30x12 Xoar ENP with a full 5" CF spinner, backplate included. Never once did the prop loosen up in 2.5 years.

I'm definitely not saying that you are wrong, but you have a different thought line. And it is intriguing.
 
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