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HelicopterSynergy R/CSynergy N7 › New N7
09-12-2017 10:11 AM  10 days agoPost 1
Helinige

rrNovice

England

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Really looking forward to this machine getting air under the skids, more excited than other builds in the past.

Any pointers for me as its ready for the maiden?

BeastX Plus, Align HV servos, OS105 Hatori pipe. Rails blades front and back?

Regards Nigel

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09-12-2017 11:58 AM  10 days agoPost 2
ibepilot2

rrApprentice

Oklahoma City, OK

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Did you make sure to LOCKTITE the transmission gear set pin? Thats a big one.

Team Synergy, Rail Blades,Team Scorpion,Team FBL Rotors

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09-13-2017 01:39 PM  9 days agoPost 3
Tyler

rrElite Veteran

Chicagoland area

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Crashed due to pin

I just built my new N7 at IRCHA. This past weekend the tail transmission pin took the N7 down. It was thread locked, a touch of CA on the pin ends, and heat shrink added around the base of the gear to help capture the pin.

Repair bill is about $550!

Every personal friend I know (except one) that flies the N7 has crashed because of this gear pin arrangement. They all encouraged me to be diligent in this area of the build. I did my best, but it still failed.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-13-2017 01:49 PM  9 days agoPost 4
dbcaster

rrApprentice

Petaluma, Ca

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I've built five n7's and my buddy has built three. We have thousands of flights on n7's. Neither of us have had a pin failure. The most important thing is to run the set screw down into the shaft without the pin installed first. If there is metal flashing in the threads it will keep the set screw from locking down on the pin.

Some arguments are sound and nothing more

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09-19-2017 01:36 PM  3 days agoPost 5
Tyler

rrElite Veteran

Chicagoland area

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dbcaster,

My repair parts have arrived. I ran the retaining grub screw all the way into the tail gear shaft as you and the manual have indicated. I carefully observed the passing of the screw by looking in the pin hole. Sure enough, two burs were folded down, broken off, and passed through the hole.

Knowing that I didn't carefully pay attention and watch for this during my initial build, I believe you may have resolved my pin failure cause. I do know I ran the grub screw in and out of the hole a couple of times, but without watching for the grub screw to pass the hole, I cannot ensure there were no burs that caused it to "feel" like the grub screw had bottomed out properly.

Thanks for pointing out that critical step.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-19-2017 06:27 PM  3 days agoPost 6
ibepilot2

rrApprentice

Oklahoma City, OK

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I have had one in the 5 n7s back out . But that was my first build and I put ca on that one and did not run the pin all the way through. I put blue locktite on all the rest and as DBCASTER says do run it all the way through.

Team Synergy, Rail Blades,Team Scorpion,Team FBL Rotors

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09-19-2017 08:48 PM  3 days agoPost 7
dbcaster

rrApprentice

Petaluma, Ca

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Glad to help. I have seen the same thing you described. It takes a bit more time to run it through and clear it out. Once you do that you shouldn't have anymore problems. I'm glad to hear you got it back together. The n7 is by far my favorite heli.

Some arguments are sound and nothing more

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