Confused, Need Clerification On This....

[LiPo Power]

I came accros few opinions about what will the strut angle do to the boat.
What I have in mind is boat running wet vs. boat running loose with nose up attitude.
Lets say it is a V hull.
Please have a look at the pictures and comment on them both.
Thank You for your time placing your input here...
I think I know the answer but sounds like there is more to it than I think....

[Rumdog]

Pic1 will push the bow down into the water (wetter) Pic 2 will raise the bow and let the hull run a bit looser

[Diegoboy]

The first one is negative angle. will push the transom up.
The second one is positive angle. It will push the transom down.

The ideal would be to have the boat setup almost perfectly with neutral strut angle and very minor adjustments to strut angle for water conditions.

[Diegoboy]

Here's some info that may help.

[LiPo Power]

Transom up = nose down?
Transom down = nose up?
I am not getting deep in to the rocket science details of boat set up but do I have my thinking right?
Ok, if your boat is running wet, would you decrease ( down ) the angle of prop strut or increase ( up )?
No trim tubs.
Thanks

[Diegoboy]

Change the COG

[Diegoboy]

...then try a degree or two positive angle

[LiPo Power]

Diego, If I will move COG forward and lower the angle of prop strut down will she still run wet?

[Diegoboy]

Yes.
Why do I feel like I'm being set-up for something?

[LiPo Power]

No, no set up, no worries, simple posts with opinions, thats all...
I was just talking to few guys and one of them has V boat running wet so I said to try lifting, decreasing the angle of prop strut to help but they told me that will do nothing to how the boat runs... That is it...
I hope there is more people responding with their expirience....
Thanks Diego...
Robert

[Diegoboy]

Pulled right from the link I posted above...

Strut angle:
A strut has a positive angle when the prop shaft points upwards, far from the water surface. In this situation, the transom is pressed down. A negative angle occurs when the prop shaft points down, towards the water surface, raising the transom. If you imagine the boat supported on a transverse shaft that goes exactly through the CG, it's easy understand that, when the transom is lowered the bow goes up, reducing the wet area. The contrary occurs with a negative angle for the strut. Although apparently we could use the strut angle to correct any incorrect attitude, the truth is that the neutral angle is the ideal, just a few degrees off are allowed to adjust the wet area. If more than 2 degrees are necessary, something else should be wrong.

strut01.jpg

[GP73]

We were wrong and you were right...

BTW, we never said that it didn't do anything, but [we said] that too much positive angle will push the whole boat down because the trust line changes.

Either ways he couldn't add any more positive angle because his strut was already all the way up, the problem is that .81 engine weights a ton and it's probably mounted too forward.

No, no set up, no worries, simple posts with opinions, thats all...
I was just talking to few guys and one of them has V boat running wet so I said to try lifting, decreasing the angle of prop strut to help but they told me that will do nothing to how the boat runs... That is it...
I hope there is more people responding with their expirience....
Thanks Diego...
Robert

[Diegoboy]

Oh. I get it now!

[LiPo Power]

That is it. Got it, thanks....

Pulled right from the link I posted above...


[ATTACH=CONFIG]55721[/ATTACH]

[HOTWATER]

There are way too many factors involved with your questions here...First of ALL...The CofG is the first thing you should get right before changing anything else w/neutral settings on the strut/prop...secondly NEVER change two things at once...one Small change at a time. What boat? What system are you talking about running? Race conditions? Weight of the boat? Size of the hull? Prop?...clear some obscurity please...