Linear Pushrods?

[uss silversides]

I know many of you use those little disk-like objects called linear pushrods or something like that on your servos to convert the rotary motion of the servo to non-binding linear motion. Beyond that, I really don't know anything about them. Can anyone give me some dimensions (i.e. the diameter of the disk, etc.)?

Thanks,
Jonathan

[JWLaRue]

Hi Jonathan,

Your probably referring to

Hi Jonathan,

Your probably referring to the product called a LineDrive, now being sold by Sullivan. The size of the disc is approximately one-inch in diameter....it's slightly larger in diameter than the full circle servo horn that comes with the standard Futaba servos.

There are some alternative products that are the equivalent to LineDrives, in particular the R/C helicopter crowd uses something similar for controlling the swashplates. They tend to be more robust given their application, but I definitely like them.

-Jeff

[wingtip]

as i fly rc helicopters

as i fly rc helicopters for the most part, i can tell you almost nobody uses this type of method for control... and of the few that are out there they are only for one function mostly and thats the rudder... here is a link to one from miniature aircraft that you will see might not do what you are thinking... its still working like a control rod on a servo arm, but the rod will stay level and not raise and lower as the arm goes thru its travel....

http://www.miniatureaircraftusa.com/Store/proddetail.asp?prod=0883%2D1

the majority of helis, especially at the swashplate, is just a control arm, or wheel (push pull on some) that has a linkage that goes straight to the swash or thru a bellcrank or two before it gets to the swash..







Just wanted you to know we just use servo arms with control rods mainly like everyone else

[JWLaRue]

The part that I am

The part that I am referring to for helicopters is made by a company named X-cell. Their product is called a "linear link kit". Check out Linear Link Kit for what this looks like.

....and it sure looks like at least part of the R/C heli crowd uses them!

What I really like about this product is that it does not use a length of steel wire like the LineDrive....which is prone to breaking.

-Jeff

[wingtip]

i have flown the xcell

i have flown the xcell line of helicopters exclusively for a number of years now which is from the company MINIATURE AIRCRAFT USA, xcell is just a line of helis they make, and mine is the xcell fury extreme that i use for aerobatic compitions... and yes, they do offer that part which is the same part i linked in my first post... I think i understand now why you are wanting it and it would be a nice part i agree... but you can go to any funfly you want and look at the rudders on any xcell and i'd be amazed if you found at least 1.......... lol


pics of my xcell fury and my previous xcells including a xcell gasser camera platform can be seen here...

http://www.runryder.com/helicopter/gallery/2102/

wasnt trying to step on anyones shoes and apologise if i did...i can just say for a fact not many people use that particular item in our world of helis...



Edited By wingtip on 1107443727

[JWLaRue]

Hi Dave,

....not a problem. I

Hi Dave,

....not a problem. I focused more on the photos that you provided and didn't even look at the url after reading "...here is a link to one from miniature aircraft that you will see might not do what you are thinking..."

Since I knew that the part I was referring to would do the same as a LineDrive.....well, I skipped the url.

To me it's not that important whether or not the R/C heli crowd uses them a lot or a little......what I care about is *our* crowd! And I'll borrow parts from any other hobby if it helps ours....

-Jeff

[wingtip]

oh believe me, there is

oh believe me, there is gonna be alot of heli items and software used on this alvin...its just easier that way lol... there are some really nice 90 degree tailboxes i'd like to use for the thruster drivetrain if they didnt cost so much lol...

but lots of other stuff thats available that will work wonders... and the wtc design comes from another field, radiation vacuum chamber technology that was made by a designer here at IU where i work... go to the gallery page i posted and there is a link in the sub section to the pdf file... check that baby out....its huge due to the engel system, and will require some serious battery weight to get her to sink probably lol but hey, this thing is gurannteed not to leak, untill i start drilling for pushrods etc hahaha

thats what we're all here for to exchange ideas and information....

[JWLaRue]

...thruster drivetrain......

Hmmmm.....that may be exactly

...thruster drivetrain......

Hmmmm.....that may be exactly what I need for my DSRV.....!

-Jeff

[tsenecal]

did someone ask about 90

did someone ask about 90 degree gearboxes?

http://www.mfacomodrills.com/gearbox...l_gearbox.html

[uss silversides]

Thanks guys! For some reason

Thanks guys! For some reason though Jeff the link you provided does not quite look like what I had in mind. I think I can remember one of Ray Mason's tapes (can't say for sure which one) that showed you and a U-boat of your's that featured some orange disks on the servos. Also (if I remember correctly), you explained that they were linear pushrods or something similar. I might be remembering wrong though and when I am finished posting this I will hunt through the videos to find the right one and check it again.

Thanks,
Jonathan

[wingtip]

hey tsenecal

thanks for that

hey tsenecal

thanks for that link! Didnt see a price though, wonder how it compares to what i had in mind from heli parts..... You guys are great



Edited By wingtip on 1107479846

[JWLaRue]

Hi Jonathan,

Ahh...the link in my

Hi Jonathan,

Ahh...the link in my previous posting was not for the Sullivan LineDrive. Here is a link that will give you a look at a LineDrive. You'll need to scroll about half-way down the page.

The current production are not done in orange plastic but what looks like some kind of white.

The Linear Link kit from X-cell does the same job, but does it differently. It also costs a bit more.

-Jeff

[uss silversides]

Thanks very much! That is

Thanks very much! That is what I remember seeing.

Jonathan

[tennesseejim]

The MFA/COMO Drills site is

The MFA/COMO Drills site is really interesting. I wish they had an importer over here in the U.S.

[tsenecal]

you might want to give

[color=#000000]you might want to give the guys at www.harbormodels.com a call. I know they carry the 6]