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MS Composit › Hornet II rudder question...
03-30-2005 06:32 AM  13 years agoPost 1
hcuellart

rrNovice

Marietta, GA 30068

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Hello guys, I am in the last process of getting my hornet into the air, but tonight while testing my gyro, I had some questions to ask you before I did something else.
First, I have everything set up, except the main blades and I thought that the tail should stay put, am I right or not. Because it didn't, I had my gyro in HL and when I throttled up it was extremely difficult to control it, I could control it for a while but then it just went of and rotated.

I don't know maybe this is normal and it would be corrected after my main blades are on the heli???

Should I get the main blades on and just try it this way???
I am a bit lost here....

Any input would be greatly appreciated.

Best regards,
Homero

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03-30-2005 08:13 AM  13 years agoPost 2
justJevvy

rrNovice

UK - Reading

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if you have the tail set up correctly it will not stay still when you power up without the main blades on - im not even sure that the gyro will be able to hold it if in HH mode as it is expecting a lot of opposite force from the main blades

This is becuase the main blades create a force in 1 direction that the tail rotor has to counteract - this is why you set the tail blades up with a 25-30mm pitch with the servo and trim in the center.

you should ideally get the heli hovering with no rudder or trim input by tweaking the length of the tail rotor servo arm or moving the servo before you switch to HH mode as it will work best if you have the closest mechanical setup (arms and linkages)

Post back if this doesnt make sense and I will try to help

X3D, Twister & Duzi Swash

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03-30-2005 08:27 AM  13 years agoPost 3
Jetmo

rrApprentice

Macomb, Michigan

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a couple idea's..

Make sure your Gear Mesh runs smooth. Not to tight or to loose.

Check and make sure your Tail Hub does not spin on the Tail slider Shaft.
Mine came loose to many times, JB weld worked wonders!

Also, how many mm do you have between the Tail Blades (Tip2Tip) when you fold them.

Don't use HH mode untill you can Hover without spinning or very little trim.

Stay in touch, Search the hell out of this place, there's answer's on just about everything at RR

"KeepMbladesSpinning"

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03-30-2005 05:21 PM  13 years agoPost 4
QuantumPSI

rrElite Veteran

Atlanta, GA

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I'm curious, which way is it spinning? If it's to the right, then you need the main blades, if it's to the left, then I don't know what to tell ya

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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03-30-2005 05:57 PM  13 years agoPost 5
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

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the tail should hold just fine without main blades. If you have everything set up correctly, the tail rotor should have a lot of pitch in one direction and about 1/3 as much pitch in the other direction.

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03-31-2005 01:28 AM  13 years agoPost 6
hcuellart

rrNovice

Marietta, GA 30068

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Thanks guys for all the input, I tried again today and in fact it did held the tail in place, so I guess I just needed a bit more power I only tried with 1/4 to 1/2 throttle, today I went all the way and the tail held its place.

Now another question, as it was at full trottle, the stabilizers were not flat(???) well the swash was not flat it was to the right and a bit to the front. I set the radio as the manual tells you to, with the pitch servo at 30% and the aileron servo at 60% (these are travel rates) can this be causing this the linkages all seem the same size in all three servos...

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03-31-2005 01:42 AM  13 years agoPost 7
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

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it sounds like you just need to lengthen or shorten the links between the servos and swashplate as appropriate. You could use trim, too, but you want the servo arms to be as close to horizontal as possible at zero pitch, and too much aileron or elevator trim can make the servo arms tilt a bit at zero pitch. This will cause those dreaded "interactions" at your collective pitch extremes.

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04-02-2005 12:47 AM  13 years agoPost 8
hcuellart

rrNovice

Marietta, GA 30068

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Thanks Dave, but at zero pitch the swash is level this happens only at the extremes of the throttle range??? I will try it with trims though. So this is not happening because of the travel ranges?
Thanks,
Homero

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04-02-2005 12:52 AM  13 years agoPost 9
Lowell Foo

rrApprentice

Vancouver, BC, Canada

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There was a thread about checking the swash for angle over the whole pitch range by attaching a straight edge to it. Might want to try that.

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04-02-2005 03:05 AM  13 years agoPost 10
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

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Hcuellart -- Sorry, i misunderstood the problem with your swashplate. Let's see if I have the symptoms correct now - at zero pitch, your swashplate is level, but at full positive and negative pitch, the swash tends to tilt. Is this correct? If so, it is caused by either the servos not being perfectly matched to each other (then never are) and/or the alignment of the servo horns and links and swashplate balls not being the same for each servo.

Anyway, you can adjust the servo endpoints to help fix the problem, if this is what's happening. Good luck!

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04-02-2005 08:26 PM  13 years agoPost 11
hcuellart

rrNovice

Marietta, GA 30068

My Posts: All  Forum  Topic

Thanks Lowell, Dave, Checking it closely this only happens at full throttle, at zero pitch and the throttle all the way down (no throttle) the swash is perfectly straight (level), this only happens at full thorottle, strange, but will try to correct this with sub-trims and see if this helps... Any other ideas as to why can this happen???
Thanks and best regards,
Homero

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