Register Now

colcha · 12-26-2010, 05:26 AM

I was flying my T-rex 450 Sport last week on the first flight of the day. As I it was flying along in a straight line, it started to roll to its starboard. Despite my efforts to counter this with opposite cyclic, the heli plummeted to the ground.

When I checked the heli, I noticed that the 65MG which controls the swashplate on the starboard side was physically jammed. I then connected and disconnected the battery a couple of times and after a while the 65MG started working again.

At this stage, the most likely cause of the crash is the 65MG. Shall I junk it or this likely to be a one off thing? Is there a way to fix the problem?

Wolfgang · 07-17-2011, 04:51 AM

Same thing happened to me except my bird was about a foot off the ground when the servo went kaput.

Junked it and got a replacement. Am now thinking of getting a replacement motor for the 65 mg and keep it as a spare

minititinflyer · 07-17-2011, 08:52 PM

i have the standard 65's get new ones. but one question for you if you saw that was gaveing problems y did you fly it?(not trying to be smart or mean )

jdqsGua · 07-20-2011, 11:11 PM

dude, I think he crashed and saw the problem after the crash, that would be a logical answer, but I can be wrong...

A.T. · 07-21-2011, 12:54 AM

Quote:

Originally Posted by colcha

I was flying my T-rex 450 Sport last week on the first flight of the day. As I it was flying along in a straight line, it started to roll to its starboard. Despite my efforts to counter this with opposite cyclic, the heli plummeted to the ground. When I checked the heli, I noticed that the 65MG which controls the swashplate on the starboard side was physically jammed. I then connected and disconnected the battery a couple of times and after a while the 65MG started working again. At this stage, the most likely cause of the crash is the 65MG. Shall I junk it or this likely to be a one off thing? Is there a way to fix the problem?

It may well have been damaged in the crash, especially if the holes in which the pin is located are elongated and gears locked up.
How old was the MG servo and how often was it serviced??

Metal gears, whilst stronger, do wear out much faster than any other type, refer
Servo - FAQ : Metal Gear Servos - DIY Repair & Extend MG Servo Gear Life Servo - FAQ : Metal Gear Servos - Why MG Servo have a Plastic Primary 1st Gear Servo - Do not turn by hand

Alan T.
Alan's Hobby, Model & RC FAQ Web Links

willlig756 · 07-29-2011, 06:13 AM

I missed a bad gear after a crash and the servo locked up in flight and crashed again. Nearly a total loss twice in a row. First one was dumb thumbs second one was dumb inspector

. I've stripped several sets of the mg gears and hb gears.

ramall79 · 02-23-2012, 05:09 AM

Same happened to me last week, i was flying the Trex 450, some stall turns and very basic loops, after 5 batteries one of the Cyclic Servo jammed and stopped working causing a crash. I was1 meter high but was in Idle up and it did not give me the chance to turn on the Thottle Hold.

This already happened to me twice in a month. I think something is definitely wrong with these servos.

Thx
Ramall

12-26-2010, 05:26 AM	#1 (permalink)
colcha Registered Users Join Date: Aug 2010	Crash caused by 65MG I was flying my T-rex 450 Sport last week on the first flight of the day. As I it was flying along in a straight line, it started to roll to its starboard. Despite my efforts to counter this with opposite cyclic, the heli plummeted to the ground. When I checked the heli, I noticed that the 65MG which controls the swashplate on the starboard side was physically jammed. I then connected and disconnected the battery a couple of times and after a while the 65MG started working again. At this stage, the most likely cause of the crash is the 65MG. Shall I junk it or this likely to be a one off thing? Is there a way to fix the problem?

07-17-2011, 04:51 AM	#2 (permalink)
Wolfgang Registered Users Join Date: Apr 2009	Same thing happened to me except my bird was about a foot off the ground when the servo went kaput. Junked it and got a replacement. Am now thinking of getting a replacement motor for the 65 mg and keep it as a spare __________________ Futaba 7C 2.4 FASST KDS 450D Tarot Sport head and tail Align TREX 250

07-17-2011, 08:52 PM	#3 (permalink)
minititinflyer Registered Users Join Date: Dec 2007	i have the standard 65's get new ones. but one question for you if you saw that was gaveing problems y did you fly it?(not trying to be smart or mean ) __________________ blade msr!, blade mcpx! ,blade 130x!, trex 250!, ,mini titan e325 v2! ,gaui hurricane 425e! ,trex 600 esp!, trex 700e! ,Hitec Aurora 9!, spektrum dx6i! ikon! quark! !AMA# 1021263!

07-29-2011, 06:13 AM	#6 (permalink)
willlig756 Registered Users My HF Map location Join Date: Dec 2010	I missed a bad gear after a crash and the servo locked up in flight and crashed again. Nearly a total loss twice in a row. First one was dumb thumbs second one was dumb inspector. I've stripped several sets of the mg gears and hb gears. __________________ Gerald Williams Goblin Black Thunder, Goblin 500, Gaui X7, X5, NX4, X3

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

07-20-2011, 11:11 PM	#4 (permalink)
jdqsGua Registered Users Join Date: Jul 2010	dude, I think he crashed and saw the problem after the crash, that would be a logical answer, but I can be wrong...

02-23-2012, 05:09 AM	#7 (permalink)
ramall79 Registered Users Join Date: Nov 2008	Same happened to me last week, i was flying the Trex 450, some stall turns and very basic loops, after 5 batteries one of the Cyclic Servo jammed and stopped working causing a crash. I was1 meter high but was in Idle up and it did not give me the chance to turn on the Thottle Hold. This already happened to me twice in a month. I think something is definitely wrong with these servos. Thx Ramall

Register Now

Log-in