RunRyder RC
 1  Topic Subscribe
WATCH
 1 page 587 views
Scorpion Power Scorpion Power
HelicopterCompass Knight 50 ODIN 90 › Something you might want to check!
03-18-2009 03:34 AM  8 years agoPost 1
petmotel

rrKey Veteran

DeKalb, IL.

My Posts: All  Forum  Topic

I've been working on updating/maintaining several of my Knights lately and found something you might want to check on yours.

One of my 3Ds and had a little slop in one of the main grips. Turned out one of the balls on the mixing arm that the short link attaches to was loose. I tightened it up, just for jollies I checked my other 3D and a Pro that are both being run with the plastic mixing arms. All three had at least one loose ball.

As a result, I decided to use a nut on the end of the 2mm bolt that holds these balls in place. As an alternative, I know some folks use CA glue when screwing into plastic. Another solution, although more expensive, would be the metal mixing arms. Problem with that is if you want the mixing ratio of the 3D, you will have to drill, and tap an extra hole in each arm.

Jay

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
03-18-2009 01:30 PM  8 years agoPost 2
Regie

rrApprentice

Manila, Philippines

My Posts: All  Forum  Topic

Thanks for the heads up. I ALWAYS do a pre-flight and post-flight check. When I get home from flying, I wipe them and check everything from top to bottom, nose to tail. Then drop an oil to all the bearings which are accessible. Before flying, I check all the screws again. Top to bottom, nose to tail.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-18-2009 02:46 PM  8 years agoPost 3
petmotel

rrKey Veteran

DeKalb, IL.

My Posts: All  Forum  Topic

I ALWAYS do a pre-flight and post-flight check.
Yes I do too, but unless you actually put a driver on the bolt to check it, you probably won't notice it's come a little loose. The one that I found was due to a post flight check.

I was trying to determine where the minute amount of linkage slop in one of my main grips was coming from. Initially I thought it was just a looser than normal link. This particular ball had loosened quite a bit.

I think part of this issue is caused by the plastic in the mixing arm being comparatively thin in this portion of the arm. The balls screwed on the end of the mixing arms stay tight probably due to thicker plastic, and possibly less tension/compression as compared to the main grip links.

Jay

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
03-18-2009 03:18 PM  8 years agoPost 4
sinte

rrVeteran

Tacoma,WA

My Posts: All  Forum  Topic

metal arms

do the metal arms not have the same 3 holes as the plastic?

jim

PM  EMAIL  GALLERY  Attn:RR  Quote
03-18-2009 07:00 PM  8 years agoPost 5
petmotel

rrKey Veteran

DeKalb, IL.

My Posts: All  Forum  Topic

do the metal arms not have the same 3 holes as the plastic?
No they do not. They were original equipment on the "Pro" models, Ade Law was the first I know of that was moving the ball 3mm closer to the main shaft. He wasn't drilling and tapping though, just drilling a 2mm hole and through bolting with a nut on the back side.

Jay

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
WATCH
 1 page 587 views
Scorpion Power Scorpion Power
HelicopterCompass Knight 50 ODIN 90 › Something you might want to check!
 Print TOPIC  Make Suggestion 

 1  Topic Subscribe

Thursday, November 23 - 1:16 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online