Driveline questions

[Shovelnoserc]

I'm upgrading to .187 flex's. I'm breaking shafts & loosing props when trying larger diameter ones, cnc646, x648 etc... With .150 flex's

So, here are my aeromarine flex's that came in the mail. I had some spare dogs and bullet caps from a twin set-up that I never built and can't find the struts.(it's been a year at least) and a s/s dog and 10-32 lock nut.

I like the smaller drive dog as it's the same size of the center of the props anything wrong with the other set up.

Also I'm not running a liner. Share your thoughs.



Thanks

Josh

[Fluid]

If the strut diameter is the same as the larger drive dog then it wouldn't matter. It is no wonder you were losing props with the 0.150 cable, that is really just appropriate for Limited setups. The 0.187 cable is 55% stronger by cross-section. But cable quality matters too, and much of the 0.150 cable I've seen is lacking in quality - some "new" RTR cable was rusty. So, top quality cable like Hughey cables may be over twice as strong as the typical RTR cable.


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[Wetter]

i want to know more about wire drive vs. flex?
i am just curios from what i have read but do not know the jest of it all and does it apply to shovelnoserc case?.

[Shovelnoserc]

Quality does Matter alot. I have easy acces to the AQ Stock replacement cables at the LHS I would just purchase the Motley Crew/Lucas Oil cable and cut to length. I never had an issue with the AQ cables until I started using larger props. They break at the coupler or at the stub and the liner sometimes binds up the cable. I'll post a few pics tonight.

I made a "prop saver" out of an old wire clothes hanger with about 50% Succes rate. Still, I'm sure it created a little drag and I still lost some nice props.

I did notice that some RTR boats at the Store when you removed the cables, they had the bend of the stuffing tube from staying in there so long w/o movement and would not straighten out, same would happen to mine if I forgot to pull them from the boat and lay them on oil when not in use.

[Wetter]

also i could never understand the radius or bend in the stuffing tube. straighter is better?

[Shovelnoserc]

The way I understand it, flex cables need a small bend to keep from vibrating.

[Cooper]

The way I understand it, flex cables need a small bend to keep from vibrating.

The reason that a flexible cable will be more efficient from having a slight bend is due to the nature of the shaft. As being flexible it will have a greater tendency to oscillate and rob deliverable power. If a slight bend is introduced it will create a minor resistance but add stability to an otherwise unstable movement of the shaft. Now the greater the bend the more resistance it creates. So needing some for stability but wanting none for power delivery. So it's a compromise of the nature of opposing spiral wound wire shafts. But not the same mechanical make up of wire rope. The flex cables are layered with opposing winds, this makes them longitudinally ridged but laterally flexible. Even with a straight shaft it would be mechanically sound to have a flexible coupler as nothing with our drive lines is really straight. Epically spinning such a small shaft at 30k.

[Cooper]

also i could never understand the radius or bend in the stuffing tube. straighter is better?

Yes straighter is better, if possible try and keep the bend radius as large as possible. More efficient for the shaft. But also keep in mind you want to have a portion of the start and finish of the stuffing tube to be straight. This isolates the bend and will keep motor and stinger lined up, putting less stress on already stressed points.