Ball link's...

[Bootlegger]

   The DuBro part # that I see is 884 is this the correct one install in the B/Crank to have a flexible type push rod going to the flaps? If not what # do you use and why?
    Again thanks...

[Jim Oliver]

Flexible type push rod???  'Splain that one for me.

Jim

[Bootlegger]

 Jim, It isn't flexible as in limber, but with the ball joint the movement isn't  as limited as with the wire going into the push rod hole in the b/crank which sometime's causes binds..
  I've seen these setups but don't have all the info that I need.
  Hope that this answer's your question..

[Jim Oliver]

Gil,
I don't have the Dubro part # handy; I have been using the ball links that screw onto a 4-40 thread and have a
2-56 screw through the ball and into the control horn.  I believe these are OK for 35-46 size models. I use the small Rocket City links on larger stuff.

Both sizes of the Rocket City links are available from Tom Morris and probably Jim Snelson.

Jim     

[Geoff Goodworth]

I am not at all sure about the Dubro 884.

I have some 497s and heavy duty 899s. The 899s are the same size as the Rocket City links that I bought from Tom Morris several years ago. Whether they are the same mechanically, I don't know. Certainly, the little brass stand-off that Dubro supplies looks like it could be useful with long flap horns.

[Bill Little]

I always find that I need a *stand off* when I use a ball link at the bell crank.  The conical brass ones are perfect, and I have had to add a few washers or a nut below them (between the brass cone and BC) a time or two..

Mongo

[john e. holliday]

Another little point I have discovered this week,  the threaded part/hole does not go all the way thru on all of them.  I measured the 4-40 ball links I have and the threaded portion is only 1/2 inch deep.   So i measured the 4-40 rod so only 3/8 of an inch is screwed in.  I am wondering if the is what happened to an individual some time back that lost his plane because of a broken 4-40 ball link.  The only time I use the 2-56 ball links is for small planes and the throttle arm on throttle contro engines.  Have fun,  DOC Holliday