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HelicopterMain Discussion › Longest Chicken dance ever.
01-21-2013 06:43 PM  4 years agoPost 41
McKrackin

rrProfessor

Lucasville,Ohio

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Yeah it is kind of funny thinking about at a spring with what 8 oz of pull or so? Most standard analog servos are 50oz minimum? I'm sure the nitro heli guys use digital, metal gears that are way more torque than that.
I use a 1290MG throttle on that heli.
It has 70 oz/inches of torque.

The spring is actually under 2 ounces of pull.

I literally never use the word literally right.

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01-21-2013 07:04 PM  4 years agoPost 42
chikoseye

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Springfield Gardens NY

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Any link where I can buy this throttle return spring? seems to be mandatory to all nitro. and you are absolutely right McKrackin about the tension load of the servo, unless they are using a 9Gram servo for throttle.. lol

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01-21-2013 07:06 PM  4 years agoPost 43
McKrackin

rrProfessor

Lucasville,Ohio

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I made my own but A Main Hobbies sells them.
They're in the RC truck parts.

I literally never use the word literally right.

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01-21-2013 07:16 PM  4 years agoPost 44
chikoseye

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Springfield Gardens NY

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thanks, I saw your vid and maybe I'd just do the same. I wonder why I didn't do this before after crashing my 30 size heli because the receiver lost battery supply turning the engine full throttle until it went into the ground,. All my nitro car has it, they used to pull back the breaking system of the car which is connected to the other side of the throttle servo.

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01-21-2013 08:45 PM  4 years agoPost 45
McKrackin

rrProfessor

Lucasville,Ohio

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A little experiment for the guys that don't seem to understand what a servo goes through....

Take the blade off your heli.
Jump in the car...we're going for a ride

Get up to speed.
Hold the blade by the root and stick it out the window...hold on tight.lol...

Hold it flat at first....Now turn it about 8-10 degrees and see if it doesn't rip itself from your grip.

Remember....the blades on the heli are going in excess of 200mph so pick a nice open stretch of road for this.

Now,that force that ripped the blade from your hand.....THAT is the force that the servo is fighting from the time it spools up to the time it lands....Much much more in fact.

The spring applies the same or less force as holding your cyclic stick in one direction or another...about the same size spring.

Compared to trying to hold pitch in a blade traveling 200+mph....You may as well call it ZERO.

I literally never use the word literally right.

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01-21-2013 08:54 PM  4 years agoPost 46
Stephen Born

rrElite Veteran

USA

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Good analogy.

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01-21-2013 09:28 PM  4 years agoPost 47
Santiago P

rrProfessor

South West, Ohio

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That is a horrible analogy!

Mc,

I get what you are saying; the spring is a tiny preload on the servo, worth the safety it adds. Averge servo can take it just fine.

But blades do not react the way you described. The centrifugal force holds the blade straight out, and the resultant torque around the axle is dependent on angle of attack and blade stability.
Unstable blade (some or the ol flybar kind) will pitch up, but they excerpt the most of the force (torque) on the flybar mechanism and linkage, not on the swash. (Back in the day I flew my FAI 60 size Xcell with 45oz-in servos, hundreds of flights, no issues)
Modern FBL blades are stable or neutral; they hold the lead-lag position close to zero and develop much less torque around the axle and consequently the swash and servos.

There is more serious torque to deal with as blades get bigger and RPM inertia go up, but is not like the servo is holding the blades from blowing back to the incomming wind. When they do, you hear loud rummble of a stalled disk, which never last long.

Now back to the Chicken Dance Channel

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01-21-2013 09:30 PM  4 years agoPost 48
McKrackin

rrProfessor

Lucasville,Ohio

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Unstable blade (some or the ol flybar kind) will pitch up, but they excerpt the most of the force (torque) on the flybar mechanism and linkage, not on the swash
Flybar?
Seriously?

And you're also wrong about the direction of force.
The air passing over and around the blade is constantly trying to flatten the blade to zero degrees....The servo fights this force to hold them at flying pitch.

I literally never use the word literally right.

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01-21-2013 09:36 PM  4 years agoPost 49
Santiago P

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South West, Ohio

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Cmon, give me a break.
I started in 1982, is hard to not to talk about memeories when one has used "them" Fbs for soooo long.

The rest of the post I descrived the load FBL system. Give me partial credit.
And you're also wrong about the direction of force.
The air passing over and around the blade is constantly trying to flatten the blade to zero degrees....The servo fights this force to hold them at flying pitch
For stable blades, yes.

S

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01-21-2013 09:39 PM  4 years agoPost 50
McKrackin

rrProfessor

Lucasville,Ohio

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The rest of the post I descrived the load FBL system. Give me partial credit.
I would have but you edited it in AFTER I posted.

I literally never use the word literally right.

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01-21-2013 09:41 PM  4 years agoPost 51
McKrackin

rrProfessor

Lucasville,Ohio

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I see you're still editing.lol...

I'll wait a bit until you settle in on an opinion....Or do you need my response first to come up with yours?lol....

I literally never use the word literally right.

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01-21-2013 09:41 PM  4 years agoPost 52
Wave

rrKey Veteran

Illinois

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This ones good for a laugh.

Watch at YouTube

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01-21-2013 10:09 PM  4 years agoPost 53
rudyy

rrElite Veteran

E. Amherst, NY

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I think the throttle servo should hold up fine. The rudder and throttle servos also have forces constantly exerted upon.

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01-21-2013 10:40 PM  4 years agoPost 54
ebonicrobot

rrApprentice

East Bay, CA

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I'm going to invest in a throttle return spring lol

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01-21-2013 10:42 PM  4 years agoPost 55
McKrackin

rrProfessor

Lucasville,Ohio

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I was just playing with Santiago.lol....

That Rappy crash is still one of my favorites.

I literally never use the word literally right.

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01-21-2013 10:58 PM  4 years agoPost 56
Justin Stuart (RIP)

rrMaster

Plano, Texas

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What helicopter was that in the first chicken dance video? It must have had an all-metal main gear or something which would allow the drivetrain to survive for such a long time.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-21-2013 10:59 PM  4 years agoPost 57
McKrackin

rrProfessor

Lucasville,Ohio

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Velocity N2 wasn't it?

Those gears did an awesome job fo sho.lol...

I literally never use the word literally right.

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01-21-2013 11:21 PM  4 years agoPost 58
rpat

rrElite Veteran

Weirton, W. Va.

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This video can go next to the one that had the whole rotor head take off from the heli. I still get a kick out of that one.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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01-21-2013 11:26 PM  4 years agoPost 59
rpat

rrElite Veteran

Weirton, W. Va.

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Yea man., just goes to show you that those velocity's can take a lickin and keep on tickin. I just bought one the N2

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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01-22-2013 12:19 AM  4 years agoPost 60
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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Going electric.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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HelicopterMain Discussion › Longest Chicken dance ever.
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