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10-01-2014, 02:01 PM | #1 (permalink) |
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Join Date: Aug 2011
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tunning a MP
Hi!
I'm setting up the gyro for a buddy, it's a MP 360, 1300 kv motor. It was running extra tight belts, i released quite a nice bit of tension, it now autos with no problems. It was running T curves, i activated the gov and upped the PWM, Two things i don't like in this heli: -The ratio is tottaly wrong for a stretch. 16 t pinion on a 120 main gear is very hard for the motor, and being a copper filled motor due to low RPM (1300 kv) means lots of heat. The HS doesn't get nowere near as it could reach in theory due to this harsh ratio. I'm running old lipos, and that doesn't help. Lipos get much hotter then on my beater with healthy ratio (13T on 150 main gear, hard to bog and easy on everything) -The Collective is very mushy around center. Are you guys running different pitch curves to make it snappier? I can wiggle the pitch in flight quite a bit, a lot, and the heli doesn't move. I can deal when flying it hard, but trying to bring it smoothly to the ground is quite a test of patience. The pitch moves perfectly linear, but the grips flex quite a bit, it must be from that. Never felt nothing like that, not even on FB helis. In general the heli is nice, smooth and silent, and its plastic parts are nice (not the grips). I had a nasty blade strike (in soft grass) that killed a blade, reversed aileron on tx, and nothing got bent. Would be changing FS on my beater with much less than that
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XL Power 520(soon to become a 480), Warp 360 , Tarot 360Sport, Logo480 LowRpm , Logo 500 T500 AP |
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10-01-2014, 03:00 PM | #2 (permalink) | |
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Join Date: Sep 2010
Location: Prescott, AZ
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Quote:
Hmm, you really think it's the plastic grips? CNC grips to fix???? bill |
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10-01-2014, 03:48 PM | #3 (permalink) |
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Thread Starter
Join Date: Aug 2011
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Nice to know i'm not the only one.
The owner of the heli also complained about the same. I'm spinning some Tarot carbon, a bit heavy but extremely stiff. I'll tune it with pitch curve. Any more solutions for this? Got to admit these grips are a very weak area, never seen this flex in any heli.
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XL Power 520(soon to become a 480), Warp 360 , Tarot 360Sport, Logo480 LowRpm , Logo 500 T500 AP |
10-01-2014, 04:27 PM | #4 (permalink) |
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Join Date: Sep 2010
Location: Prescott, AZ
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It is sensitive to blade types. I find the lighter blades are snappier around center. RJX Vectors and the original SAB black and white blades work very well.
Heavier blades like the RJX Energy or Edges were mushy. |
10-02-2014, 06:14 AM | #5 (permalink) |
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Join Date: Aug 2011
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I also had Tarots, they always seemed to hesitate before they bite.
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2x MCPX I Gaui »X1« I 2x Mini Protos I Protos I DX8 |
10-02-2014, 02:05 PM | #6 (permalink) |
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Thread Starter
Join Date: Aug 2011
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Flown it today with some very light blades with exactly the smae result. More agile on cyclics but generally the same mushyness.
Will try a S pitch curve, no way a different blade will cure this.
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XL Power 520(soon to become a 480), Warp 360 , Tarot 360Sport, Logo480 LowRpm , Logo 500 T500 AP |
10-02-2014, 02:32 PM | #7 (permalink) |
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Join Date: Aug 2011
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How smooth is your head? Mine doesn't do this
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10-02-2014, 02:51 PM | #8 (permalink) |
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Thread Starter
Join Date: Aug 2011
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It is nicely smooth.
Bending both blades back and holding them together at 0º, giving smal collective inputs, there is a big flex in the grips, the design is not direct at all. I see no other reason, the blades i tried today are light FB blades.
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XL Power 520(soon to become a 480), Warp 360 , Tarot 360Sport, Logo480 LowRpm , Logo 500 T500 AP |
10-03-2014, 05:54 AM | #9 (permalink) |
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Join Date: Feb 2007
Location: England
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Have you tried it with FBL blades - I have found that this has made a big difference on a couple of helis (though not specifically on the "mushyness")
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10-03-2014, 01:32 PM | #10 (permalink) | |
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Thread Starter
Join Date: Aug 2011
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Quote:
Today flown with S pitch curves, and even ended up with a pretty agressive one: 0 10 50 90 100. It worked very nice flying, nice flips and tic-tocs, couldn't feel the mushiness. But when bringing it for landing, the same dificulty in keeping a smooth descent. I guess it will be tricky to find the right numbers, specially with 5 point curves.
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XL Power 520(soon to become a 480), Warp 360 , Tarot 360Sport, Logo480 LowRpm , Logo 500 T500 AP |
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