Hydro pros..........need help, PLEASE!!

[Make-a-Wake]

Probably cuz of the long rudder..................lemme cut it down to 3 1/2" or so and see what she does.

[Jeepers]

hard to tell from the video, but it looks like its still dragging its tail.

[Make-a-Wake]

Quick vid from today. Gettin' her figured out finally. Made a direct pass at my buddy who radar'd her at 48 mph. I have 3-5 mph left the way she sits due to my long rudder..................kinda sheepish to even show it. Its a rudder from Stevens store here and has the correct setback and so forth, just long. Gonna cut it down before the next run so it should reduce some drag.

[Make-a-Wake]

^^ He's not running the stock motor, so I don't think the M435/3 will be much good. He's running a low kv bigger motor on 8s (yes, 8!).

[wparsons]

^^ He's not running the stock motor, so I don't think the M435/3 will be much good. He's running a low kv bigger motor on 8s (yes, 8!).

[CircusCircus]

You should try a M435/3 blade Octura, I have found this to best all around prop for the proboats, if it feels like your topping out, jump up to a 437/3 blade.

[Make-a-Wake]

Thanks Jesse...................i'm stayin' with a straight turn fin................had no idea the stock fin could throw it off so badly if it wasnt set just perfect.

How fast was your Elam........................over 50?

[Jesse J]

nice, glad to see you happy with her performance, much improved. keep at it!

[Make-a-Wake]

Here she is on glass! That darn stock turn fin was a real party pooper..............she runs like i never thought she would now that i had played with the strut and put a big mono turn fin on her!

I went down to an x640 as one other change, but will now obviously go back to the 642.

Thanks so much for everyones help!! I'll post a new vid with the x642 tomorrow.

I'm pumped!

[Make-a-Wake]

Thanks for all the info guys.................and parsons, you were right about the servo trim............i had it cranked pretty far left.

[pda75]

I have the same approach (zero degre strut).... but I always have a central spanson on my rigger. Therefore the front angle sponsom does not depends on the strut depth.

I place the strut depth in order to have the prop at the standard position (when only the blade of the prop goes into water) and start with a low lift propeller

I then try to get the CG position which balance the rigger in order to be stable (no bumping) and then put some more weight on the strut (10% more). Than I adjust the strut angle depending on the prop lift.

Pierre

[tharmer]

I always start with the strut at 0 degrees. Then I move CG to find a spot where the boat appears neutral when it lifts off a roller. Then I adjust strut depth to get the ride height I want at the stern. A surface riding prop will always come to the surface almost regardless of how deep the strut is. This has the effect of pointing the nose down (not forcing it down) so that less air is packed under the hull, giving the impression that the nose is being forced down. After all this is done, I tweak the strut angle in very small increments to help the CG balance the boat at speed.
-t

[wparsons]

Scorp, in regards to it turning better to the left. Do you mean sharper, or it handles turns better? If you mean sharper, its probably because you had some left trim, which reduces the throw to the right. Check to see how much throw you have in each direction before looking into it too much.

[Jesse J]

nice Mark, I am glad you brought in COG, major player. Good points about how the COG influences the adjustment type. Your post highlights the complexity of how the variables can influence one another and are again, not mutually exclusive.

Thus the many factors to consider, then there is the type of prop - more vs. less lift, as well as hull type.

[MarkF]

Lifting the back of the boat up by lowering the strut can lift the hull up evenly or it can bary the nose. It all depends on were the cg is. This is used for getting the ride heighth were you want. When you angle the strut down ( negative) it tries to force the back up but also the front down. Good for boats that are tail heavy or flighty. Can cause hopping in hydros though. Pointing the strut up ( possitive ) will help hold the nose up. Good for nose heavy boats. Also helps monos hold the bow up in the turns and helps get rid of hop in hydros. This is my basic understanding of how the strut works. Of course every boat is different and you need to play with the different strut angles to tune your boat.

Mark

Mark