**Excellent Article on RC Boat Hull Attitude, How the adjustments affect handling**

[Darin Jordan]

For those interested, this is a really good read concerning the handling and affects of adjustments on an R/C Boat.

http://www.modelpowerboat.com/content.php?122-RC-Model-Boat-Hull-Attitude

[ray schrauwen]

Thank you Darin!

Now it doesn't say much about the problem I have with my P-mono.

I have a DF33 hull Speedmaster hardware (tapered rudder) 4092 2200Kv tp power, running a 2 blade 45mm prop or 42mm 3 blade custom.

As soon as it gets to the 3/4 mark of a straight on the oval it evenly lifts itself out of the water, losing power and speed. It corners well though....??

I'm going to rebuild it this winter putting the motor in the rear and cells up front. That or try a second hull but, I should not need to get another hull as this one is fine.

[Brushless55]

Very cool stuff..
need to setup my DF33 PMono a little more for 2013

[keithbradley]

Thanks for posting Darin.
I like the part where he says "a good running boat will look slower than a poorly set up boat" .
So true!

[Shooter]

Great article. Thanks for posting. The pictorials, especially the affects of rudder angles and sizes, were very helpful.

[detox]

Her is another verygood ellectric boat manual.

http://fastelectrics.net/fe_manual.php

[viper1]

For those interested, this is a really good read concerning the handling and affects of adjustments on an R/C Boat.

http://www.modelpowerboat.com/conten...-Hull-Attitude

Good article, I studied it before but there is one thing that still confuses me, if some could explain the how and why would be fantastic.
It concerns the strut depth,

Under "Drives" it is stated that: "every time the bow raises the prop goes deep into water and raises the transom, counter reacting the raising of the bow - again an excessive correction raises another problem - in this case porpoising."

This tells me that a prop going deeper in the water raises the transom (and in turn lowers the bow) right?

Then in turn under the graphic drawings at "Propeller deep" it tells me that a lowering the prop or strut will lower the transom and raise the bow. This contradicts the above statement unless I'm missing something (and I probably do....)

Could somebody please explain which one is right and why ?

Thanks in advance!

[NativePaul]

If you lower the strut you will keep it at the same angle that it was at before, the thrust ling being lower than the CoG it will tend to lift the bow under power.
The only way for a prop to deepen whilst running is by the whole boat pitching up which makes the props thrust cone face downward so a proportion of your thrust is now lift.

[viper1]

If you lower the strut you will keep it at the same angle that it was at before, the thrust ling being lower than the CoG it will tend to lift the bow under power.
The only way for a prop to deepen whilst running is by the whole boat pitching up which makes the props thrust cone face downward so a proportion of your thrust is now lift.

Thanks Paul,

I get the first bit, but than in second line : "the props thrust cone face downward so a proportion of your thrust is now lift". That lift will raise the transom and lower the bow again right? (And I imagine the start of porpoising here) While in the article the cure for porpoising is "Lower the strut" ?

Maybe I am a bit 'thick'...

[Fluid]

Then in turn under the graphic drawings at "Propeller deep" it tells me that a lowering the prop or strut will lower the transom and raise the bow. This contradicts the above statement unless I'm missing something (and I probably do....)

No, that interpretation of the drawing (or the drawing itself) is wrong. It is well known that lowering the strut on a surface drive mono will raise the entire boat - this is why using a strut instead of a stinger is a much better tuning aid for a mono or cat. If a mono is chine walking, raising the strut will lower the hull into the water and reduce or cure chine walk. The drawing shows a submerged drive, which is pretty anachronistic today and of little use to the modern boater. Remember, just because something is on the Internet does not mean it is correct....



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