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Building Tips and technical articles. => Building techniques => Topic started by: sadams714441 on March 25, 2007, 06:14:56 PM

Title: arrowshafts
Post by: sadams714441 on March 25, 2007, 06:14:56 PM

I have a Vector 40 Brodak kit, getting ready to mount the arrowshaft push rod to the elevator, how do you mount the adjustable rods in the end of arrowshaft?  Also using ballinks on ends. 

Title: Re: arrowshafts
Post by: Leester on March 25, 2007, 07:03:42 PM

If you are using ball links then you are using threaded inserts for the push rods. The inserts are JB Welded in the push rod. The inserts are not adjustable, you adjust by screwing the ball link on the insert.

Title: Re: arrowshafts
Post by: Leester on March 25, 2007, 07:08:32 PM

Is this the type you are refering to ?

Title: Re: arrowshafts
Post by: Bill Sawyer on March 25, 2007, 08:51:14 PM

And don't forget to wrap the ends of the carbon with something to prevent splitting. I use dental floss with a good drop of epoxy spread around.

Title: Re: arrowshafts
Post by: sadams714441 on March 26, 2007, 06:39:29 PM

The pointed ends that are placed in the end should be JB welded Also ??? Then wrap with floss or something

Title: Re: arrowshafts
Post by: Jim Snelson on March 26, 2007, 07:31:06 PM

Attached you will find the instructions for the Tom Morris Control System I sell. They should work for on your application. Lets see if I can get the attachment to work. It is a pdf. file.

Jim Snelson
www.clcentral.com

Title: Re: arrowshafts
Post by: sadams714441 on March 26, 2007, 07:36:24 PM

Thanks Jim got it......

Title: Re: arrowshafts
Post by: t michael jennings on March 27, 2007, 08:02:28 PM

If one puts right hand threads in one of the arrowshaft and left hand threads in the opposite end, then by turning the arrowshaft one can move the ends closer or further apart.  This allows adjusting the centers with out disassembling the joint.

New Ball Joints are normally not threaded.  The first time the Ball Joint is screwed on to the threaded part is the making of the threads in the Ball Joint.

Dubro makes a Turnbuckle (#2156; $3.50 for two 4-40) for adjusting the Tie Rods of a RC Car.  The Turnbuckle has right hand threads on one end and left hand threads on the other end.  Cut the Turnbuckle in half and use the ends in the arrowshafts using the appropriate arrowshaft insert.  Epoxy the insert, half turnbuckle, into the arrowshaft.  Then wrap the ends of the arrowshaft.

t michael jennings
 ~^

Title: Re: arrowshafts
Post by: Bill Little on March 27, 2007, 09:33:15 PM

Tom Morris, and Jim Snelson at CLC, has left hand threaded inserts with a hex shoulder machined on it to use for adjusting length.  I use them at the rear to connect to the elevator horn, and then use a small hatch to be able to access it.

Title: Re: arrowshafts
Post by: Paul Smith on March 29, 2007, 04:38:40 AM

My current plane will have a ball link at the bellcrank, Dave Brown pushrod, and Dubro soldered clevis at the control horn.  This will avoid the indeterminate situation of having RH threads on both ends.   

The ball link has more range of adjustment than the threaded clevis.  The combination of metal rod and plastic ball link makes a good friction lock.

Also, the threaded metal clevis, together with the threaded metal rod  has a history of failure.  My system avoids this.