MSR common problems?

[machasm]

A little tip to those of you that are new to the MSR is that the end cap of the tail motor can be pushed out if you crash heavily against the tail blade. The way it can be strengthened is to drip a spot of cyno on the cap where it joins the metal body of the motor, followed by using some heat shrink around the motor and allowing it to shrink around the end cap.

If anyone needs a picture of this, just ask, and i'll sort one out.

Cheers, Rob

I wish I had read this earlier. Guess who has had to order a tail motor then. Doh!

Also as a matter of interest as I was removing the tail motor I also unplugged the main motor and then connected the battery to what was left of the MSR to see if the servos were moving smoothly.
It was at this point that I noticed that when I use some rudder the elevator servo would also move! I have managed to dial this out using a mix on my DX7 of rudder to elevator.
So now I need to see if it makes a difference to the flight characteristics when I receive my new tail motor.
Ade.

[karladam1234]

I wish I had read this earlier. Guess who has had to order a tail motor then. Doh!

Also as a matter of interest as I was removing the tail motor I also unplugged the main motor and then connected the battery to what was left of the MSR to see if the servos were moving smoothly.
It was at this point that I noticed that when I use some rudder the elevator servo would also move! I have managed to dial this out using a mix on my DX7 of rudder to elevator.
So now I need to see if it makes a difference to the flight characteristics when I receive my new tail motor.
Ade.

Abe.... Has the mixing made any difference??? if so please explain how you mixed it please....cheers

[machasm]

I believe it has karladam1234.
I am now able to fly the heli a lot more smoother than before and can even use it to practise backward circuits.
Before the mixing there would be interaction between the rudder input and the elevator servo.
In order to eradicate this you need to select one of the p-mixes ( programmable mixes) in the DX7 menu.
Then what I did was select rudd -> elev mix and just changed the numbers until the aeliron servo would barely move at all when pushing the rudder stick over.
In my case these numbers came out as -27% and -42%.
These numbers may be different in your case.
Just unplug the motor wires from the control board for both head and tail then push the relevant sticks. When you push the rudder there should not be any servo movement as the rudder stick just changes the speed of the tail motor rather than pushing a servo.
The ael stick should just push or pull the ael servo and the elevator should just push or pull the elevator. If you find any other servo moving then you will need to do a P-mix as explained.
I am not sure why there is interaction here but doing this has cured/botched it!
Hope this helps

[dan-eboy]

One thing i've found is that the MSR and 120 SR tail motors don't take much to break/deteriorate I've just ordered my 3rd for msr and 2nd for the 120. So if like mine yours rotates better one way than the other it is probably the tail motor, my msr won't even really rotate anti-clockwise now and rotates clockwise under acceleration!

[Hitman]

Hello. Fresh poster here. I have been trying to no avail to stop my mSR from constantly rotating left. I'll try to explain.

-fresh charged battery
-all trims set to middle
-place heli on a smooth flat surface
-spool up the heli, just enough so that it is light on the skids

-with NO OTHER input, the heli spins and spins CCW.

if i adjust the rudder trim to max-right, the heli will still rotate CCW, albeit at a much reduced rate.

is this to do with the fact that it is not in hover yet, and perhaps there is some ground effect going on? could it be the tail motor? i haven't tried to hover it much higher than a few inches, because of the rapid CCW movement.

I have a DX6i radio, and it is set up to some pretty common settings for an mSR (i can provide setting details if that would help).

Please help! I want to fly my mSR!
Thanks!

[RCCHOPPERSUK]

Hi Hitman,

If you can't trim it out (on stock TX) or adjust on a Computer radio - it could need a new tail motor. If its not kicking out enough power, this can cause the heli to turn. If that still doesn't sort it, it could be the board (worst case and last thing to replace!!!!). The other thing to check would be the main gear and brass section on the main motor. Similar story - if the main motor is not turning as well as it should, the tail motor could be kicking more power out than the main motor - thus causing the rotation. Things to look for would be heavy wear (normally grey/black) on the gear.

Jake

[dan-eboy]

i 2nd what jake said but have you tried lifting it off into a hover? They do sometimes spin until they're airborne and away from ground. Give it a good burst to get it airborne and see how it hovers

[dan-eboy]

Also waht settings are you using, might be worth trying a standard setting?