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Home✈️Aircraft🚁Helicoptere-BladeOther › Hi throttle lift problems
07-19-2006 12:48 AM  14 years ago
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mtnbike4522

rrApprentice

Idaho

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Hi throttle lift problems
Today i was playing in my car port with the little cp, trying to get my wings back. I noticed that it would only hover close to the ground and at full throttle it sounded like the blades were bogging down and it would thus loose altitude.

any ideas what gives?
AIM - Mtnbike4522
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07-19-2006 01:45 AM  14 years ago
slider46

rrProfessor

Ocala Florida

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Check your blade pitch, at 1/2 throttle in normal mode and idle up you should have 0* pitch.... Tom..... No "D" flying....
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07-19-2006 04:11 AM  14 years ago
mtnbike4522

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Idaho

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K. thanksAIM - Mtnbike4522
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07-19-2006 03:53 PM  14 years ago
pschurter

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La Serena - Chile

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Also, check the covering of the blades. I tried to pair a couple of blades from different sets that had their respective mate blade in emmm... "bad" shape. Balancing them was quite hard, but I managed to get them close.
When I put them on the Blade, it wouldn't lift. So I thought the covering was a little bad and that was bogging and thus eating all the lift power. I re-covered them and it improved a lot, lifted but without much lift power, but then tracking was bad.
After closer inspection, I noticed that the (mismatched) pair were of quite different lenghts (4mm~5/32", so each blade would lift differently, making tracking a nightmare.
Changed to a new set of blades, and the heli flew like a champ.

So, my set of lessons learned if wanting to recycle worn blades:

1. Check integrity of blades
2. Check blade balance
3. Check that both are the same size, shape, weight, and CG
4. Check covering
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07-20-2006 03:06 AM  14 years ago
mtnbike4522

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Idaho

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that might be it. one of my kittahs chewed on one of the rotor tips

AIM - Mtnbike4522
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07-20-2006 03:54 AM  14 years ago
ReverendWolf

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Overland Park, KS

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I'm having the same issue. My head speed sounds plenty fast especially at mid stick where my blades are 0 and no drag but it still takes a good bit above 3/4 stick to get good lift. I'm using the Carbon Syms and a 9T with a 1300 Li-Po. You wouldnt think the extra weight of a CNC head and the super-skids from HD would be that much of an issue but if its a weight to lift issue I can probably talk myself into going back to the old skids. Not terribly likely though.

Rev
The only thing necessary for Evil to succeed is for good men to do nothing.
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07-29-2006 03:50 AM  14 years ago
mtnbike4522

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Idaho

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the blades were a few deg up at mid stick so i turned them down and still nothing. so i dont know wtf is upAIM - Mtnbike4522
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07-29-2006 05:47 AM  14 years ago
arclite5

rrApprentice

coral springs, florida - usa

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My blade has the same exact lift problem. I think that it might have something to do with the motor going bad. Although my blades track like crap even though they both have 0 pitch at mid stick in idle, -12 and +12 at each end. When they're not spinning, they're perfectly tracked with one another. I wonder.
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07-29-2006 02:23 PM  14 years ago
cowboychris

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Pittsboro, NC, United States

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What should the head speed be w/ stock motor, 9p, symm blades, and lipo 1300?
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07-29-2006 05:42 PM  14 years ago
pschurter

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La Serena - Chile

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Headspeed should be:

Battery voltage*motor RPM rating*motor pinion/main gear*efficiency

-Any 3S Lipo is 3*3.7 = 11.1 [V]
-The stock Blade motor is ~2300 [rpm/Volt]
http://www.runryder.com/t216550p4/
-Let's assume overall efficiency ~ 80%

so, that would give us:

11.1 [V] * 2300 [rpm/Volt] * 9 / 140 * 0.8 = 1312 [rpm]

which is kinda OK for hovering around, forward flight, and mild aerobatics
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07-30-2006 07:39 PM  14 years ago
rky5

rrVeteran

Oak Hills california

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I stopped
I stopped using the carbon blades , it hovered nice with them.........but never seem to have good head speed .....when I went back to wood I noticed a big difference in trying to do loops and so on, so im sticking with wood now.

I would add a little pitch maybe to get it off the ground better .
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