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11-13-2005 04:24 PM  12 years agoPost 1
ChrisJ

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MI

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The other day I noticed that the crown gear in my 3d pro had a couple
of teeth missing.When I installed the new crown gear it meshes with
pinion gear for the tail drive so tight that the crown gear is tilted on
the main shaft. I tryed removing the small washer behind the pinion
gear but this didnt help. I have thought about removing some material
from the back side of the pinion gear to allow it to move toward the
rear. Before I try this I wanted to get some input on this problem.

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11-13-2005 06:12 PM  12 years agoPost 2
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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sounds like two separate issues:

1) you can break teeth off the crown gear very easily with a tail strike that suddenly stops the tail. 1 tooth missing doesnt seem to be an issue with mesh...i've even flown crown gears with 6 teeth missing. but, no 2 missing next to each other.

2) as far as the mesh being too tight, i'd check the metal gear locations on each end of your torque tube. as per the instructions, the gears must be flush with the end of the carbon fiber rod. if either has slipped outward, the shaft is effectively too long, which can cause the crowngear mesh to be too tight.

if it ain't broke, break it.

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11-13-2005 07:11 PM  12 years agoPost 3
ChrisJ

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MI

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I'm sure the reason for the broken teeth is from tail strikes as I am not
very good at landing. There is a bearing at the front of the tail boom
mount that wont allow the gear to be moved back. I removed .020 off
the back of the pinion gear which made things better but not right.
What do you think about removing the crown gear and filing some
material off of the top so that it sits higher up allowing more clearance?

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11-13-2005 07:17 PM  12 years agoPost 4
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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you're right. the bearing keeps the gear from moving back. the problem is it moving forward. if the front metal gear is too far forward on the shaft (or if the rear gear is too far back on the shaft), it causes the whole assembly to be too far into the crown gear, causing a too tight situation.

you really shouldnt have had to remove any material...just verify that the CF rod is exactly flush with the ends of the metal gears.

hope that helps.

if it ain't broke, break it.

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11-13-2005 09:16 PM  12 years agoPost 5
ChrisJ

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MI

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I checked the end of the rod and it is flush with end of the gear. The
small end of the pinion gear is flush with the inner part of the crown
gear teeth. Think I will pull the new crown gear out and compare it
with the old one as it meshed properly with the pinion gear.

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