BLADE mCX S300 And MSR THREAD

[McKrackin]

That's called TBE (toilet bowl effect) and usually means the swash is less than perfect or a blade is heavier than its mate.Unbalanced flybar does the same thing.
Mine will do that if I just let it hang there in a hover but I can easily counter it and hold it still.

[bugbitten]

After a dozen flights I can get the mSR to hover a little better and jog the controls to slow the TBE. Still, it will take over if I don't counteract. Can't find the mechanical cause.

I have noticed that with full forward cyclic and lots of power that it barely goes forward or climbs. Ease back on the cyclic and it hits the ceiling if I don't trottle back quickly.

Any and I mean any, reverse cyclic and it dives at the floor tail first, nose swings slowly to the right and a death spiral starts.

Is this normal?

[bugbitten]

After another round of batteries, I held the mSR in my hand to watch the effect of cyclic movement on the swashplate and servo. It appears that the servo travels the same distance for forward and backward, but the effect on the blades is not nearly the same. The forward pitch of the blades is just minor compared to the reverse movement. The swashplate movement doesn't have the same effectin forward as it does reverse.

Note: I am using the Dx6i in airplane mode with no programming, just bound.

[Solitaire]

I did a little testing on the various 'lil LiPo's available for the mSR/mCX and put together a small chart for a reference.

I tested 6 different LiPo's in my mSR and set the timer to 6 minutes for each. The test was simply a hover with no forward flight involved. Starting voltage for all 6 LiPo's was 4.18. The batteries were temp checked immediately after the flight and the voltage was taken approx 10 minutes after that to allow cool down and the voltage to settle. Note also that 3 of the 6 LiPo's didn't make the 6 minute mark. As soon as the canopy started flashing the flight ended. Remarks as follows:

1 EFlight flashed at 4m 56s
2 Tenergy flashed at 4m 20s
3 FlightMax flashed at 4m 26s

These 3 LiPo's are quite well used and may be losing some of their power. Several other older FlightMax LiPo's couldn't cut the test at all, flashing at anywhere from a few seconds to a minute or two.

The Hyperion and Turnigy LiPo's are 4.6mm longer than the other 4 and need to be mounted slightly aft in the battery tray to maintain reasonable CG.

The OutRage NRG made the 6 minute mark exactly. The canopy flashed just as the timer beeped. I expected more out of it considering the name/price.

I'm suspecting the Hyperion is underrated judging by the mAh I put back into it. I also noticed that Hyperion now have a 160mAh. I may order a couple of these to test.

It's interesting that all 6 LiPo's had a resting voltage of approx 3.7v. I'm not sure what voltage triggers the canopy flashing, but I'm suspecting something around the 3.4 to 3.5 mark.

Initial power for flight wasn't a problem for any of the six, but the throttle had to be upped a bit for the heavier Turnigy. The extra weight was noticeable but not a deterrent.

I'll be phasing out the Tenergy's and Zippy's and will stick to the higher C value LiPo's. From the data, I'm thinking the best fit for the mSR would be a 140-150mAh 20C LiPo.
Too bad nobody makes one.

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[McKrackin]

I have three of the stock E-flite lipos that flash in a couple seconds and won't fly but the voltage is good.
I wonder if the contacts wear out or something?
They have maybe 50 flights each on them.

[bugbitten]

Do you cool down between flights of the mSR?

[McKrackin]

Not me.

[bugbitten]

I should have said that the reason I asked is that I burned out the tail motor after only 32 flights. I wonder'd if the 4 flights in a row was an issue.

[McKrackin]

I wouldn't think so but maybe.
I've only had three batteries at a time and usually lose interest after two anyway.lol...

My MSR was one of the ones that sold the first week and it has original everything except one blade grip.

[Solitaire]

I would think 2 batteries and a cool down would be a safe bet for keeping motors from dying prematurely. I follow that formula and still have the original motors. Maybe 100 flights, so far.

[bugbitten]

Thanks for the replies.

I'll try those cool-downs if I can ever get flying again. Right now it will only scoot to the back or side. I've taken the head apart and rebuilt and replaced the flybar and blades. Replaced the tail motor and boom.

Checked all the linkages and used the swash tool. Nothing looks wrong. It doesn't lean in any direction when held by the wingtips.

Had the LHS guy try to fly it. No luck!

I'm guessing that I may have to send it in for repair.

[akent]

Thanks for the battery info, Sol!
I guess the 160's sound good. I'll have to order a few of those!
As soon as I get an email that those are back in stock, they are GONE by the time I can get there!

I'll keep trying...
====
Hey Bug, one of the guys I work with has an MSR that had similar problems. His had a piece of hair lodged in one of the servos, causing it to bind a little. Might be worth a look with a magnifier....
Kent

[nunyabizniss34]

Xheli is now selling batteries for the mSR/mCX

www.xheli.com/blli31214cfo.html

Also available is a 150mah for $2.90

Might be worth a try

[Solitaire]

Looks like everyone is getting into mSR LiPo's, Colin.
How do you like your 160 Turnigy's?

[nunyabizniss34]

I haven't tested them yet Sol. My mCX is awaiting a swash and the mSR is awaiting a tail motor. I should have them up and flying by next week

Colin