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MSH Protos, Mini Protos
› Protos pins falling out
07-07-2008 07:18 AM  9 years agoPost 1
Sam2b

rrElite Veteran

Seattle, WA

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Since the first 3D flight of my new Protos, the pins holding the washout arm joints are working their way out. I found myself pushing the pins back in after every flight. The evidence is the pin literally hanging half way out. The tail has the same potential also using push pins.

Today I had a the one of those pins fall out to the point of looking all cyclic and collective! Fortunately I was upright and flat so I could auto down, but the pieces crunching was not a good sound.

Why is there a push pin instead of a small screw with a shoulder? The Trex450 uses such a screw and no problems. Back to the hobby shop.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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07-07-2008 01:43 PM  9 years agoPost 2
Corrado-Italy

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Italy

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We revised holes in the arms, much tighter now.
In the mean time that the new arms make it to your hobby shop put a drop of ca while inserting, it'll stop them from falling out.

Corrado

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07-07-2008 06:08 PM  9 years agoPost 3
drdot

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So. California, Orange County.

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fwiw..

Here's a trick dating back to the Raptor 30...Drill a small hole into the midpoint of the washout arm where the pin goes through...assemble the arms, then use a toothpick to place a small drop of thin CA in the hole...Works great, dosen't come out..This can also be done on the t/r pins if necessary...

John.

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07-07-2008 06:12 PM  9 years agoPost 4
Corrado-Italy

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Italy

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We have no reports of t/r pins generating any problems so far.

That is a great tip drdot, thanks.

Corrado

Corrado

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07-07-2008 09:08 PM  9 years agoPost 5
Sam2b

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Seattle, WA

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Upon purchasing new parts, how will the customer know the parts are the latest version produced? Is the part number different in any way? Any other marking on the packaging to distinguish the two?

I don't want to have this problem again and spend more money on a worse crash. Thanks.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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07-08-2008 03:58 AM  9 years agoPost 6
akshaw

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Plymouth Meeting, PA

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So far my pins are staying put, but this has me a little worried. Wouldn't drilling a hole potentially weaken the arm? What about putting CA on the ends, wouldn't that work?

There is no royal road to flying helis but the sim sure helps!

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07-08-2008 04:47 AM  9 years agoPost 7
drdot

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So. California, Orange County.

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fwiw....

Don't put ca on the ends of the pins!!!...The arms pivot on the outsides of the pins, the center of the washout arm is tighter to retain the pins...do some work to get this assy. as smooth as possible, and you'll have a much better flying heli...

John.

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07-08-2008 05:23 AM  9 years agoPost 8
Sam2b

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Seattle, WA

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The arms pivot on the outsides of the pins, the center of the washout arm is tighter to retain the pins
Correct: the pin actually is supposed to stay put on the wash out arm itself (the center section of the pin assembly), and the pin is supposed to swivel on the radius arm (the Y shaped linkage).

I bought new ones today, but I'm not sure if it is a new production or old production part.

I am shying away from CA glue because I don't want to have CA anywhere near this joint.

I know the Logo has pins on the same join similar to the Protos, and with no problems. One can only hope they've received the new wash out arm that is the tighter version.
Wouldn't drilling a hole potentially weaken the arm?
No, I used a drill bit the same diameter as the radius arm pin holes, so I carefully turned the drill bit in the holes a little more to widen a very small amount. I kept using the drill until the pin slid in smoothly with zero slop. It is possible.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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07-09-2008 06:26 AM  9 years agoPost 9
Sam2b

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Seattle, WA

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Update:
I replaced the both washout arms decided to further drill out the radius arm holes to fit the pins a little more loosely but with no slop. The result after two 3D flights showed no sign of the pins shifting. I did not use CA to glue them in since I do not want CA anywhere near the pin joints. More time will tell, but before I had the pins shifting outward since flight #1.

I should also include I moved the flybar linkage from the inner hole to the outer hole too. I am not sure if that makes any difference whatsoever, but that is the only other change I made since this recent success. (by the way: the Protos flies more stable while using the flybar outer hole).

I am not sure if the success is because the newly manufactured part, or because I drilled out the radius arms, or maybe both.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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08-24-2008 01:34 PM  9 years agoPost 10
haucke

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Hurst TX

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I just went in inverted

I believe this was due to one of the pins coming out in flight. I was able to recover all head parts but one pin. The other pin was about half way out. I will purchase a set of screw type fasteners if you will offer one Corrado...

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08-24-2008 02:35 PM  9 years agoPost 11
audio131

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attleboro , mass , usa

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hi

sam2b did we not already have this discusion already... you tried to tell me there was no problems,,,, i told you how i fixed mine,,

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08-24-2008 06:23 PM  9 years agoPost 12
Corrado-Italy

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Italy

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New parts have holes much tighter.

Corrado

Corrado

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08-25-2008 07:56 PM  9 years agoPost 13
akshaw

rrApprentice

Plymouth Meeting, PA

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drdots solution works great!

There is no royal road to flying helis but the sim sure helps!

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