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Author Topic: Popped a main grip link in flight - E7  (Read 1457 times)

Offline Aterren

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Popped a main grip link in flight - E7
« on: September 06, 2014, 09:21:51 PM »
A few weeks ago I had the swash side of the main grip link pop in flight.   Fortunately I kept it out of the 6' tall corn field and only damaged skids the 52T tail drive gear.
I would say my good luck continues.

Now for a question: why?   I did a thorough pre flight including giving the head / links a good tug.   The links were new maybe 100 flights ago.   I was running ~2050 RPM and the link popped as I rolled aggressively on the down line of a big cuban eight.  It was an agressive roll using full stick travel (vbar, 8 degrees, 100 pct agility, 30 pct paddle sim).   

What are your thoughts / experiences / recommendations?  Should i be replacing my links more often?  Did I get too agressive? 

Thanks!
Adrien



Offline curmudgeon

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Re: Popped a main grip link in flight - E7
« Reply #1 on: September 06, 2014, 10:55:16 PM »
Sorry about the crash.  It's very unnerving when a crash is due to a mechanical failure.  Is it possible you may have Boto-Sized that particular link a little too loose?

Offline Mike Spano

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Re: Popped a main grip link in flight - E7
« Reply #2 on: September 07, 2014, 06:53:28 AM »
Sounds like that may have been what happened. Just one turn too many with the sizer. Glad to hear that you saved it as well as you did though!
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Offline Aterren

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Re: Popped a main grip link in flight - E7
« Reply #3 on: September 08, 2014, 08:34:26 AM »
Yes, I suppose that is possible.  I have always sized so they just fall under their own weight.  Is that looser than you guys go?


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Offline curmudgeon

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Re: Popped a main grip link in flight - E7
« Reply #4 on: September 08, 2014, 08:55:19 AM »
I size the tail links loose, but not to the point they fall on their weight.  I size the head links a little tighter, and let them loosen up after a few flights. 

Offline Aterren

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Re: Popped a main grip link in flight - E7
« Reply #5 on: September 09, 2014, 09:12:04 AM »
I will replace them all before flying again.  Thanks

Offline Rodney Kirstine

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Re: Popped a main grip link in flight - E7
« Reply #6 on: September 09, 2014, 10:33:11 AM »
Yes, I suppose that is possible.  I have always sized so they just fall under their own weight.  Is that looser than you guys go?
That is looser than I shoot for on mine. 
Rodney

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Offline Cliff Chmiel

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Re: Popped a main grip link in flight - E7
« Reply #7 on: September 09, 2014, 04:36:38 PM »
In my old nitro days, if you could pop It off with you fingers it to loose, and with the head speed you run now, I would think you need tighter, back then if you were running 2100 or 2200 it was screaming, had no govs then
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Offline Aterren

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Re: Popped a main grip link in flight - E7
« Reply #8 on: September 10, 2014, 05:41:02 PM »
...if you were running 2100 or 2200 it was screaming, had no govs then

I was running around roughly 1950 when it popped.   2200 on a 700 is screaming in my book.