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HomeRC & Power✈️Aircraft🚁Helicoptere-Scorpion Electric Components › anyone ever helicoil a scorpion?
03-29-2010 11:30 PM  10 years ago
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cudaboy_71

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sacramento, ca, u.s.

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anyone ever helicoil a scorpion?
i'm running a 4035 on a trex 600. too much torque for the 3mm screws and i've stripped both sets of threads out. i thought going to 4mm would help, but now i've stripped the first set of 4mm threads.

apparently the scorpion aluminum case just isnt up to the task using the 2-bolt system provided with the 600. so, rather than risk stripping out the second set of 4mm holes, i'm considering helicoiling them to 4mm and running the KDE bearing support (which would provide a tiedown to a 3rd hole (which is now stripped).

my question is has anyone ever helicoiled a scorpion? i'm just not sure there's enough material in the design of the can to use it. any other suggestions?
if it ain't broke, break it.
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03-31-2010 10:23 PM  10 years ago
Richardmid1

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Leeds, England

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Sounds like your just over tightening them. You could try 3/16 UNC (10 UNC) which is between M4 and M5 and is a courser thread.60% of the time, it works every time!
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03-31-2010 10:27 PM  10 years ago
ESWLFSE

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Liberty Hill, TX

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Trex 600? Bond/screw a plate on top and tap/helicoil through double the thickness?

How are the threads in your motor mount plate doing?
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04-01-2010 01:51 AM  10 years ago
cudaboy_71

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yes, i'm definitely overtorquing them. the power of this motor is overpowering the bolts and causing the motor pinion to slip off the main gear. i'm going through gears like crazy.

even torquing the crap out of the screws the motor is still slipping.

there never were threads in the motor mount (well, not the holes the motor screws pass through). theyve since been drilled out to take 4mm screws anyway.

i like the idea of mounting another plate to helicoil to. however, since i'm now using the KDE shaft support (required because i also started eating shafts and bearings due to the load) there is less than 1mm reserve for shimming anything.

so, if i lose the KDE support i could do a helicoil/baseplate mod. but i'd rather not risk shaft snaps, and i'm tired of ruining bearings.

this is all the cost of running a hot rod. but, i still would like to find a solution. i may just have to get the 700E conversion motor mount and cut it down to fit in the 600. that motor mount takes 3 bolts instead of the 600's 2 bolts.

i'll probably also have to get another scorpion motor since replacing the top mount requires more work than i'm up to (high-temp epoxy and some way to break it loose in the first place). seems a shame since the motor is running fine otherwise.
if it ain't broke, break it.
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04-01-2010 04:32 AM  10 years ago
PJRono

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Minnesota, Ya!

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I had my 4035 mounting holes strip. The aluminum on the mount is really really soft. I used helicoil to fix it better than new!If you skip me I can't play!
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04-01-2010 04:49 AM  10 years ago
spdntckt

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San Jose, CA USA

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This is very strange. I (and others i fly with) dont have this problem on the Logo600.. i dont even put the screws very tight (dont want to strip them). i do, however, use the counter-bearing. Not sure what would be different though...
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04-01-2010 04:51 AM  10 years ago
PJRono

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The motor didn't strip the holes, I did. But as I said the aluminum on my motor is very soft!If you skip me I can't play!
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04-01-2010 11:40 AM  10 years ago
Richardmid1

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Leeds, England

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Cudaboy, are you using governor mode on your esc? How many cells are you running in series?

If you are running 12s that is a very powerful 700 setup and that would be the reason you are stripping gears! Running governor mode will increase the torque going to the main gear when applying alot of pitch.
60% of the time, it works every time!
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04-01-2010 03:09 PM  10 years ago
PJRono

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Minnesota, Ya!

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He didn't say he was stripping gears, he stripped the 3mm motor mount holes. And yes, helicoil worked for me.If you skip me I can't play!
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04-01-2010 04:28 PM  10 years ago
Justin Stuart (RIP)

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Plano, Texas

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I bought a Scorpion motor for the Trex 250 where the screw holes stripped out really quickly. They said it was a factory defect. Too soft aluminum maybe. I got a replacement and it hasn't stripped yet.

Send the motor to Lucien Miller and have him replace it. It might be a bad batch of motors with a bad mixture of aluminum that is too soft.
Avant RC
Scorpion Power Systems
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04-01-2010 05:41 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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to answer some questions:

12s setup...yes lots of torque/power. this is the problem. i *JUST* installed the counter bearing which i'm hopeful will solve the problem. but, it's too late for the current threads in my motor, as only one set of 4mm threads is still viable...the other set has stripped....hence the need for helicoil. i don't really want to tap to 5mm since i'd have to mod the counterbearing. i'd rather stick with 4mm if i could...which leads me to-----

what size/style helicoil did you use, PJRono. since it seems to have fixed your issue i'll just do what you did. also, are you using the counterbearing?
if it ain't broke, break it.
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04-01-2010 06:19 PM  10 years ago
PJRono

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Minnesota, Ya!

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I didn't use a counter bearing, but I do have a top bearing on both my setups. I used the Recoil brand thread repair kit M3-0.5 part#35030. The M4-0.7 part#35040 is the 4mm version.If you skip me I can't play!
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04-01-2010 06:21 PM  10 years ago
PJRono

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Minnesota, Ya!

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If I remember right the aluminum where the insert goes in is very thin so I used the 3mm so enough threads would bite and used red loctite to lock the coil in place.If you skip me I can't play!
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04-01-2010 06:22 PM  10 years ago
PJRono

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Minnesota, Ya!

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Oh, be careful for the stator wires. They're not that far away and easy to nick.If you skip me I can't play!
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04-01-2010 07:59 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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Oh, be careful for the stator wires. They're not that far away and easy to nick.
ahh, yes. i learned this (almost the hard way) when i tapped to 4mm the first time.

thanks.
if it ain't broke, break it.
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