Thanks so much, Roger A1.

Of course, I'm not saying that paralleling is generally not recommended. In fact, I use it often.
I have 6-volt, 4-Ah AGM lead-acid batteries, and when I want to increase their range, I parallel them.
So far, I haven't found any 6-volt batteries with more than 5 Ah that are of an acceptable size and are suitable for my needs.
I preferred to make a general statement that is always valid and can be useful for everyone, because in this specific case, we don't know the voltage of the 9-Ah or 5-Ah battery, we don't know what type of battery they are (AGM, Lipo, NiMh, etc.), we don't know how large they are, or how much available space they have.
Maybe the title should suggest something?
There aren't even any photos.
However, it's likely that you're referring to NiMH batteries whose nominal cell voltage is known, and very common battery packs are 7.2 volts. These aren't essential questions, but they can help you conduct market research and understand your options.

I'm really glad you appreciated my contribution.

Coincidentally, right now, and especially for tomorrow, I've been monitoring the wind situation (force in knots and direction) in the area between Ostia and Fiumicino on the Roman coast.
For us, the service is provided by the Italian Air Force, which, among other things, issues the official Meteomar bulletin every six hours and covers the entire Mediterranean.
The Beaufort scale is the same worldwide, but definitions vary. I had to consult the internet to see that the English use the term "brezza" [breeze] (with different adjectives: light, gentle, moderate, fresh, strong) from levels 1 to 6, while in Italian, the term "brezza" [breeze] is used for levels 2 and 3.
For the last degree, the twelfth, the term corresponds to "hurricane," "ouragan," or "uragano" in English, French, and Italian.

Hi StephenT.
I assume you mean parallel connection logically.
I assume 5000 means 5000 mAh.
In series connection the voltages are added while the Ah remains the same. Of course we are talking about identical batteries.
In parallel connection the voltage remains the same while the Ah are added.
Regardless of the type of engine, if there are no particular needs that justify this choice, a single 9 Ah battery is better than two 5 Ah batteries.
In theory, with two 5 Ah batteries in parallel you would have an electrical charge of 10 Ah instead of 9 Ah (but you could see if there are 10 Ah batteries on the market), so two 5 Ah batteries would be better.
However, parallel connection has some problems. In parallel connection the batteries must be identical and with the same voltage before being connected.
You must ensure that they are detached from each other when not in use.
This is necessary because the more charged battery (more voltage) will charge the less charged one (less voltage), discharging itself and therefore there will be current flow.
Eventually they will discharge much faster than the normal self-discharge that occurs with open poles.
Two batteries in parallel should be imagined as a closed circuit with two ideal generators and two internal resistances.
In fact, the real generator can be represented as an ideal generator in series with a resistance (the internal resistance with a very low value).
I'll stop here but if you want other explanations to understand better there's no problem.
I would add that, in my opinion, inserting a diode between the batteries can only be a solution by considering the voltage drop of the diode itself (perhaps by choosing the right type).

In conclusion, as already mentioned, if you don't have geometric, space, bulk or other problems, use a single battery with a higher electrical charge.

P.S.
It may be useful to remember that Ah (Ampere Hour) is the unit of measurement of electric charge and not of current intensity (Ampere).
It is the same unit of measurement expressed in Coulomb. In fact there is a precise correspondence between Ah and Coulomb.
As everyone knows, units of measurement can be expressed in various equivalent terms. Ah is much more useful than Coulomb for a battery.
It may be useful to remember that the E.M.F. (Electromotive force, measured in Volts) of a battery, is not the same as the voltage of a battery.
In fact, the E.M.F. it is given by the sum between the battery voltage and the voltage drop on the Ri (internal resistance). The first is a nominal data while the second depends on the current flowing in the circuit.
It is easy to experience that the E.M.F. and rated voltage match, only in an open-circuit battery. In closed circuit the two voltages differ.
This happens because, according to Ohm's law, when current flows through a resistor (even if it has a low value), it creates a voltage drop.

I like the overall look and the details.
The lighting is very evocative.
It deserves a few more photos.

Hi Hermione, I'm glad I could be of help and, above all, that you had the patience to read old threads with already-existing information (many don't have the patience to do so).
This doesn't mean you can't ask any questions at any time; it's always a pleasure to answer.
I realize it will be a long process, but it's best to do it well and slowly.
From what I see in the photo, this model is not only large but could be very valuable. In any case, you can add to it as you wish.
I've resumed modeling after years of inactivity.
Many jobs were interrupted and then resumed for long periods of time.

Congratulations on your patience and meticulousness in building the Mturpin hull; the result is exceptional.
I agree with the decision to resin it.

Another admirable model, Chugalone.
I enjoyed many of the details of this tugboat.

Thanks for the reply, Gary.
You've given me some new information.
I never imagined anyone could power small steam engines for scale ship models with coal.
Amazing! I don't know how efficient this solution is, but it's definitely the closest to realism.
A niche solution for true enthusiasts.

Everyone knows that the Portuguese Ferdinand Magellan named the new ocean the Pacific because it seemed calm and tranquil compared to the Atlantic.
He didn't have time to change his mind. Not everyone knows that Magellan never completed the voyage around the world (which was absolutely not the mission's initial goal).
Part of his multinational crew completed it only aboard one ship, the Victoria. Besides Commander Juan Elcano (the Spaniard who eventually took command), very few men returned, including the Italian Antonio Pigafetta (a native of Vicenza in the Veneto region), who had the great merit of recounting everything in writing.
We know it all thanks to him.
Despite being taught in school, despite being shown documentaries or, lately, TV series (very well done), I am still captivated by this fascinating and incredible story.
Recently, I enjoyed one of the best historical reconstructions of the entire expedition I've ever seen or heard, on YouTube.
The authors and the presenter of the channel, in addition to the notions and the story, which I already knew, were so good at making me identify with the anxieties, indecision, and suffering of the crew who had to face storms, calms, hunger, thirst, battles with various natives, but above all scurvy (a vitamin C deficiency disease completely unknown at the time).

A satisfactory test Andy, very important, the model performs very well in the water.

AI has lent us a helping hand today.
It has come down to a very simple, elementary-level question.

Hi Steve, I agree with you; studying new topics is always a good thing (perhaps stimulated by something like an exam or a simple quiz without consequences).
However, today, it was enough to reason and use the logic and common sense of a good father.
Many rules follow a natural rationale that's easy to understand, accept, and agree with.
Other rules are highly technical or conventional and simply need to be memorized.
Today, the other three answers would have been rules that weren't in line with SOLAS's objectives.
Well done, Steve.

Hi Gary, that's exactly what I wanted to know. You were very thorough.
Lots of useful and interesting information.
I was surprised by the duration. Half an hour seems like a good amount of time.
I was thinking much less, 10 or 15 minutes at most.

Do they all run on gas, or are there other fuels (and I'm not just saying theoretically), like alcohol?
From what I understand, in any case, gas is the most efficient (in fact, water is the first to go), right?

Hi Chugalone, I also think that after treating the balsa hull with epoxy resin both inside and out, it will be very resistant, even without the use of fiberglass.

Just a question, Gary, you've probably been asked this a thousand times.
How much range do you have on your models (maybe tell me which is the best performing and which is the least durable if you don't want to make a full list)?
How much fuel (I think it uses alcohol) and how much water can you carry on this model?

Very nice this engine Gary.

You've provided a very precise and detailed description of all the construction phases.
I really appreciate this approach because it shows the author's touch and style, any customizations, and is useful for anyone having difficulty and looking for help or guidance, even without having to ask questions.

The use of balsa leaves me a little perplexed. I don't like using this wood for naval purposes (unlike model airplanes).
To reinforce and waterproof the model, will you use epoxy resins (or similar) and will you rely solely on wood stains and paints?

I agree with you, Chugalone! You're a true artist! Multifaceted, to boot.
I admire you.
Imagination and creativity are excellent resources for model making.
I enjoyed drawing, using Indian ink with 0.2 nibs, but I'm not good at painting.

As for the Juanita, I'll wait for the water tests.
I asked because it's a problem that has plagued many modelers and isn't the easiest to solve, but I think something can be done.

Hi Chugalone, I understand that working with the railings isn't easy, but the result was excellent. Beautiful to look at.

I asked if it was an RC model because I wanted to ask a question that would have been pointless if the model were just static.
Do you have any ideas for solving the maneuverability problem that characterizes this type of boat (with a flat bottom and paddle wheel that aren't ideal for turning)?

Very interesting model Chugalone.
Will it be a static or dynamic RC model?

Hi BernhardT.
But is it a reproduction of the famous "Destriero" waterjet, the one built by Fincantieri that won the Blue Ribbon?
Is yours a navigable RC model?

For BernhardP.

A friend of mine built a swamp boat, and it works very well, although it needs some improvements to its navigation.

Can you turn well? Is it stable at high speeds?

This type of boat is definitely not my style, but I'm very curious about it.
If you have any videos, please attach them or post a YouTube link.

---------------------------------------------


Für BernhardP.

Ein Freund von mir hat ein Sumpfboot gebaut, und es funktioniert sehr gut, obwohl die Navigation noch etwas verbessert werden muss.

Lässt es sich gut manövrieren? Ist es bei hohen Geschwindigkeiten stabil?

Dieser Bootstyp ist eigentlich nicht mein Fall, aber ich bin sehr neugierig darauf. Falls du Videos davon hast, hänge sie bitte an oder poste einen YouTube-Link.

For Mike

Thanks, Mike. I actually didn't understand anything with the translator.

How fascinating these boats with real steam engines are!
I love them so much, I hope to build them myself someday.

Hi Algon, I was looking at various riverboat models after Hermione's questions (it's amazing how large her model is) and I came across your riverboat.
Will you leave it as a static display scale model or will you make a dynamic RC model?

Hi Gary, the world of steam-powered model ships (with real steam engines) is always fascinating and little-known to me.
I'd love to see more images of this model of yours.

A question, if I may: Will you leave the engine exposed without a deck covering? If so, why did you choose this option?

Hi Hermione, as I told you, I searched and collected some interesting discussions on this topic.
I'll provide the links at the end.
There are several issues to address: the right engine power (and therefore size), the correct gear ratio, the difficulty of maneuvering such models, etc.
These links have been discussed and may be of help. I hope so.
If you have any other questions, please ask; there are many experts in this forum.

harbour/105103

forum/146404

wiki/147457

wiki/150316

Hi Ed, I agree with you.
I had to learn it. In school, I was often asked why the Mediterranean, despite being very warm year-round, has no coral reefs?
Actually, if you think about it, north of the Red Sea there's one of the most beautiful coral reefs in the world (hopefully it survives), while there's nothing off the Nile, yet it's not that far away. On the coast of North Africa, there aren't many rivers (or large mouths like the Nile), that's true, but the mouths of European rivers are too close to those coasts, in a relatively small (especially compared to the large number of freshwater streams) and closed basin like the Mediterranean.

Here's the video I was talking about yesterday.
It's very interesting and informative.

https://youtu.be/lqsdKqcX8O4?si=4OCSEid4b3zxFrDK

Hi Chugalone, thanks for your explanation.
Ross asked a great question.
When I asked it, I had to find a solution because I didn't know any others.
It's different from the one you used and the one Ross used, which I think are very valid.
Thanks for sharing the various stages of the process.
You always learn something new.
I had a problem back then: I couldn't create closed circles because I had already secured the mast with the crosspieces, so I couldn't thread them in anymore.
I had to find a way to gradually close them around the mast.
It wasn't easy because not even the cyanoacrylate glue would hold them together.

Anyway, congratulations to both of you for your ingenious and effective circle-making methods.
Your circles have exceptional realism, well done.
I certainly wasn't able to achieve such brilliant results because 1:60 scale is a disaster for small details; you have to make do.