Du-Bro 101 - How To Install Pull-Pull Systems

[@charlesmyers9765]

I know this video is kinda old but a swivel would allow adjustment without removing the clevis from the servo. Though that's just more weight. Great video.

[@hifinsword]

This pull-pull setup was very well presented and something I have considered as a beginner in this hobby. I think I would install the heat shrink on the line before adding the 2nd connection. But the standard or imperial units with these systems is so confusing to me. Although this is about a pull-pull system, I have always used push rods. Why hasn't Dubro gone with all metric sizes for a complete end to end system? It's so confusing trying to use 2-56 or 4-40 hardware with rods that are 3/32 or 0.93" or even 2 or 3mm or whatever they happen to be. But I rarely see 4-40 or 2-56 size rods. They are usually 0 point something inches in diameter. But a 3mm or 2mm diameter rod will always fit a 2 or 3mm size connector, clevis or ball link. Metric is so simple and NOT CONFUSING! If you have a complete METRIC setup, control horn, ball links, threaded rods, and clevises with a way to THREAD them, NOT SOLDER, them together, with a jam nut on each end, it would be VERY HELPFUL!

[@keithfollo8805]

I believe that the cables are soposed to be crisscrossed in the fuse

[@JoshuaOrchard]

Hey There! As I mentioned at 14:21 in the video, crossing and NOT crossing are debated topics in our hobby. There are plenty of other publications that are easily searchable on this topic as well as other geometric considerations.

[@SonAndDadFPV]

Also make sure the servo arm and linkage at the rudder are the same length, otherwise the tension will slack when turned

[@JoshuaOrchard]

RIGHT! I cover this at 14:46 but an excellent reminder that this basic geometric consideration be taken.

[@Edubarca46]

For a 4.25 metres wingspan glider, a Minimoa, should I use the large or medium push pull kit. You only mention engine powered aircraft.

[@dubropineridge]

I cannot be certain but based on the wingspan I would guess the larger size would be best.

[@Edubarca46]

Thanks for your prompt reply. I'll use the large one.

[@JoshuaOrchard]

@@Edubarca46 I agree. The larger set will provide a stronger leverage arm for the forces on such a large ship.

[@LouCosmeRC-ov2ol]

I just want to know which size to buy. Why not show the difference between the 2 larger sizes?

[@dubropineridge]

Hello. This one is TRICKY since there are actually FOUR different versions of systems that we offer. It really depends on the application. The different sizes have different sizes of hardware that vary by how "BEEFY" they are. From the lines themselves to their attachment points, it really does depend. Like a 2-56 set would probably be fine for a WWI application on a pretty good size model but at the same size model if you are going aerobatic, you'd want to beef that up. Peace of mind and all that. If you are going with a precision aerobatic IMAC airplane you are going to want that heavy duty set. There's no set "model size" per se, only that the hardware is matched to go from micro flyer to large scale aerobat and it is up to the modeler to decide the exact application. I hope that helps.

[@tboystoys5682]

Thanks for sharing. 👍 I’m new to the hobby and that’s the first time I ever heard of a pull pull. Knowledge is power.

[@dubropineridge]

Welcome to the hobby! Glad you gained some knowledge. Let us know if you ever have any questions. Happy flying!

[@6489532ab]

Beautiful Push Pull setup. 🤔

[@GaryBaird.Photography]

How do you apply the shrink tube to the crimps AFTER you've already made the connection? I must have missed something.

[@JoshuaOrchard]

Sure, you can remove the nut from the threaded rod link and slip the shrink tube over and then re-install. I cover this at 12:10 but I hope that this added text helps you out.