Rotor head problem

Rotor head problem

Post by np1.. » Sun, 16 May 1999 04:00:00



Hi,

My heli is still unflown because I want to do some mods before start
flying and only in ends of July Ill have the time to do the mods and
Seting it up. After I finished the assemble process I found a weird
thing about my Rotor head, it seems to be disaligned with the mainshaft.
This is what it happens:

Measuring the heigth between the floor and the tip of the blade:

Blade number one pointing to the front 28,9mm
Blade number two pointing to the front 30,7mm

Blade number one pointing to the right 29,7mm
Blade number one pointing to the right 31,6mm

Blade number one pointing to the back 31,2mm
Blade number one pointing to the back 33,0mm

Blade number one pointing to the left 30,5mm
Blade number one pointing to the left 32,3mm

Whats the problem and what to do to correct it?

Thanks,

Joaquim Fonseca

 
 
 

Rotor head problem

Post by MArmitstea » Sun, 16 May 1999 04:00:00


Quote:

> Hi,

> My heli is still unflown because I want to do some mods before start
> flying and only in ends of July Ill have the time to do the mods and
> Seting it up. After I finished the assemble process I found a weird
> thing about my Rotor head, it seems to be disaligned with the mainshaft.
> This is what it happens:

> Measuring the heigth between the floor and the tip of the blade:

> Blade number one pointing to the front 28,9mm
> Blade number two pointing to the front 30,7mm

> Blade number one pointing to the right 29,7mm
> Blade number one pointing to the right 31,6mm

> Blade number one pointing to the back 31,2mm
> Blade number one pointing to the back 33,0mm

> Blade number one pointing to the left 30,5mm
> Blade number one pointing to the left 32,3mm

> Whats the problem and what to do to correct it?

I wouldn't worry about it,the VR uses a flapping rotor head design.You
can't measure inacurracies by just measuring the blades from the
floor.Once the blades are up to speed & in track,they will find their
own height and lead/lag positions.

Martin

 
 
 

Rotor head problem

Post by Beavi » Mon, 17 May 1999 04:00:00



writes

Quote:
>Hi,

>My heli is still unflown because I want to do some mods before start
>flying and only in ends of July Ill have the time to do the mods and
>Seting it up. After I finished the assemble process I found a weird
>thing about my Rotor head, it seems to be disaligned with the mainshaft.
>This is what it happens:

>Measuring the heigth between the floor and the tip of the blade:

>Blade number one pointing to the front 28,9mm
>Blade number two pointing to the front 30,7mm

>Blade number one pointing to the right 29,7mm
>Blade number one pointing to the right 31,6mm

>Blade number one pointing to the back 31,2mm
>Blade number one pointing to the back 33,0mm

>Blade number one pointing to the left 30,5mm
>Blade number one pointing to the left 32,3mm

>Whats the problem and what to do to correct it?

There IS no problem J: Leave things as they are at least until you've
flown the thing.

I'm probably going to get a few flames thrown my way after this but here
goes anyway......

Like I said in a previous post, you appear to be new to the hobby of
modelling and heli flying so I'm asking the questions below for the
obvious reasons.

What are you doing modifying a heli that you've not flown, and why, and
why do you think that you already know more about how and what makes a
heli fly better than those who designed it?

Do some flying, get some experience and THEN try to beat the design
experts at their own game.

Read some books on the subject and start THINKING about your problems
before you open yourself to ridicule with questions that shouldn't need
asking. (Example: I don't know what length the pushrods need to be you
asked, when in the same sentence you TOLD us what the lengths were!)

Beav (Primed and ready to repel boarders)

--
Beavis

You can E-MAil me at the usual place (Beavis at nachos dot demon dot co dot uk)

Or you can visit my website (although why you'd want to I have NO idea) at

www.nachos.demon.co.uk

 
 
 

Rotor head problem

Post by Heli Frea » Thu, 20 May 1999 04:00:00


Are you sure that main shaft is 100% vertical?  The landing skids are not to
be trusted in these kind of measurements.

Another thing is have you ballanced your rotor head yet?  If there is a
problem as you described, it will show up during balancing.


Quote:
> Hi,

> My heli is still unflown because I want to do some mods before start
> flying and only in ends of July Ill have the time to do the mods and
> Seting it up. After I finished the assemble process I found a weird
> thing about my Rotor head, it seems to be disaligned with the mainshaft.
> This is what it happens:

> Measuring the heigth between the floor and the tip of the blade:

> Blade number one pointing to the front 28,9mm
> Blade number two pointing to the front 30,7mm

> Blade number one pointing to the right 29,7mm
> Blade number one pointing to the right 31,6mm

> Blade number one pointing to the back 31,2mm
> Blade number one pointing to the back 33,0mm

> Blade number one pointing to the left 30,5mm
> Blade number one pointing to the left 32,3mm

> Whats the problem and what to do to correct it?

> Thanks,

> Joaquim Fonseca

 
 
 

Rotor head problem

Post by np1.. » Sun, 23 May 1999 04:00:00


Hi all and Mr. Beavis in particular,

As you said Im pretty new to all this amd thats probably why Im not
the expert you would like me to be and, for that reason, when Ive some
doubts I ask the experts.

My concerning about the rotor head can be explained for my fear of
having assembled the rotor head and made any mistake, I was not
criticizing the heli design. Now I know that I havent done anything
wrong because I had some reply from experienced flyers who say this is
normal.

About the pushrods lenghts Im pretty sure that if I need a link of 90mm
from the centre of the ball link hole to the centre of the opposing ball
link hole the pushrod cant measure 90mm. What Im asking is whats the
lenght of the pushrod to have a link of 90mm, or saying this in other
way, whats the lenght  from the tip of the pushrod to the centre of the
ball link, or whats the leght added to the pushrod by  the two ball
links.

Example: 90mm link = 80mm pushrod + 10mm added by the ball links

Excuse me for bothering you with my silly questions but I will continue
to post my questions to this newsgroup, because there are nice moddelers
who are always ready to share their knowledge with experienced flyers
and to help those who are trying to start, like me. You have always the
option of not reading my posts.

Thanks anyway,

Joaquim Fonseca

 
 
 

Rotor head problem

Post by Beavi » Mon, 24 May 1999 04:00:00



writes

Quote:
>Hi all and Mr. Beavis in particular,

>As you said Im pretty new to all this amd thats probably why Im not
>the expert you would like me to be and, for that reason, when Ive some
>doubts I ask the experts.

>My concerning about the rotor head can be explained for my fear of
>having assembled the rotor head and made any mistake, I was not
>criticizing the heli design. Now I know that I havent done anything
>wrong because I had some reply from experienced flyers who say this is
>normal.

Yeah it's normal, but did I actually say any different? I don't think
so!

Quote:

>About the pushrods lenghts Im pretty sure that if I need a link of 90mm
>from the centre of the ball link hole to the centre of the opposing ball
>link hole the pushrod cant measure 90mm. What Im asking is whats the
>lenght of the pushrod to have a link of 90mm, or saying this in other
>way, whats the lenght  from the tip of the pushrod to the centre of the
>ball link, or whats the leght added to the pushrod by  the two ball
>links.

Well that would simply be a matter of measuring the shank on the link
and deducting the required amount wouldn't it? Why not just place the
ball links 90mm apart on a flat surface and measure the distance between
the centre of the shanks on each link and make the rod that length?
Working out how to do something like that doesn't require a degree in
rocket science, just a little thought.

Quote:

>Example: 90mm link = 80mm pushrod + 10mm added by the ball links

>Excuse me for bothering you with my silly questions but I will continue
>to post my questions to this newsgroup, because there are nice moddelers
>who are always ready to share their knowledge with experienced flyers
>and to help those who are trying to start, like me. You have always the
>option of not reading my posts.

Posting questions isn't the problem, but not using your head and
thinking about the problem before asking the questions won't help you in
the long run. If not being able to figure out the length of a rod
because you fit links to both ends is too hard, then I you're going to
be posting questions here every 5 minutes and NEVER get the ***y
helicopter in the air.

Quote:

>Thanks anyway,

>Joaquim Fonseca

Beav

--
Beavis

You can E-MAil me at the usual place (Beavis at nachos dot demon dot co dot uk)

Or you can visit my website (although why you'd want to I have NO idea) at

www.nachos.demon.co.uk