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Wow, I actually cannot believe it. If you treat them as the same section. The Section modulus and area inertia don't change that much. Thank you for not losing patience in teaching this to me.

Hi Ad Hoc, Thank you for your reply. I am getting 45 265 cm4 from my calculations. Thank you for the help TANSL. I am reading up on it. To me I just want to know quantitatively how to solve this. Applying the Excel Sheet that I have already made. .

Hi Ad hoc, Thank you for your ample reply just so I understand what you mean more clearly. What you mean is regardless of how large the lightening hole would be. I would still calculate for example the frame in this instance with Web H and I do not need to take the Hole H in consideration. So...

I see. But I would argue that a hole so large would invalidate whatever shape it has in the first place. It must be weaker structurally than a member that has a more appropriate sized hole. But as you pointed out, I have incomplete knowledge on this so I might be wrong.

I see. Thank you. I am aware of how to calculate these. However I am very limited with my application. For example, I don't know how to account if the plate has a huge hole in it. The rules are also very clear of not cutting webs more than 50% of the height. Preferably, I don't really want to...

Hi Adhoc, I don't think I have done that. To this point, I have only done checking on section modulus of members with plating attached and a longitudinal hull girder strength. Could you point me in a right direction where I can learn it? Right now I am also doing an analysis of the stern of...

Yes told him the same. But obviously, he didn't like it. Glad that I could clear that up.

Hi All, Currently, I am designing a deck for a client, and he has given me a plan just to verify if the frame system can pass ABS requirements. I have uploaded a picture describing two sets of systems. in the "A" picture is what I understand to be definition of "unsupported span", if all...

Hi, How do you guys model the parallel middle body connected to the aft and fwd portions of the hull. Ive always did the hull in one singular surface, going from either fwd to aft or aft to fwd depending on what I feel on the day. I think this is okay for Stability Purposes, I find that the...

I agree, we did not went ahead with it. We just launched the vessel as normal.

Might be a stupid question, but has there been any instance of fully running the engine and propellers while the boat is seated on a drydock partially submerged in water (still grounded to check if the shaft are free from vibration)? My first impression is that this is dangerous and should not...

Hi, Thank you for taking time to answer. I agree but Im hoping for something like the one in the link below. Section 7 Corrosion additions https://www.imorules.com/GUID-7EC38D9F-B63A-4CD3-A32E-BA190DAB602B.html I want to at least get a rough estimate of how much I can make our steel weight...

Hi all good sirs, Do any of you have any idea where, I can find a reference material for the corrosion addition per year if using corten steel instead of mild steel.

Thank you, your explanation makes the most sense to me. And I know that the brackets are part of the span calculation, But I tend to just use this as "extra" just for safety margin so to speak.

Thank you for your reply. Yes I would do that. At what point do you "not" end the span at the stringers though? like for example if add another side stringer at the same size as the ordinary web would that further decrease span? Sorry if this is too basic, this is the first time we are...

Thank you for taking time to answer. So what I am currently designing is a floating gate, rules in used is ABS under 90m. Which was recommended by the UFC graving dock manual. I know this is a basic question, but the gate is really deep about 10 meters so I want to make sure I am calculating...

Is my illustration correct?