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    AlessandroSPQR
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    Member No.#8123
    Registered๐Ÿ“…17th Sep 2023
    Last Online๐Ÿ“…25th Feb 2024
    City๐Ÿ“Rome
    Country๐Ÿ‡ฎ๐Ÿ‡นItaly
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    Posts๐Ÿ’ฌ668
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    ๐Ÿ‡บ๐Ÿ‡ธ River Rat ( Captain)
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    ๐Ÿ’ฌ Re: USS Fletcer, 1942
    2 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 7 Views ยท 0 Likes
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    Entered. Too bad there is no data for your other splendid scale RC ships.

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    ๐Ÿ’ฌ Re: USS Fletcer, 1942
    2 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 7 Views ยท 1 Like
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    Thanks Toradog, I will post as soon as possible.
    However it seems real.
    Why don't you post more photos and videos?
    This ship deserves much more than just one photo.

    ๐Ÿ’ฌ Re: USS Fletcer, 1942
    9 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 13 Views ยท 0 Likes
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    Hi Toradog, I was looking for your Juneau after reading your post in the propellers topic.

    But what have you managed to build? 239cm?
    Spectacular!
    Excellent!

    Can I insert the data of your USS Fletcer (it seems to me to be an excellent example of RC ship modelling) in the list of the first message of the following topic?





    forum/135991
    ๐Ÿ“ MANUFACTURERS AND SELLERS OF NAUTICAL PROPELLERS FOR RC MODEL BUILDING (USEFUL LINKS FROM ALL OVER T
    14 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 8 Views ยท 0 Likes
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    ๐Ÿ“ Reply
    Added Toradog, thanks so much again.

    ๐Ÿ“ Using gears to match speeds
    15 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 11 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hi Roy,

    "Hi Alessandro I shall be in Australia this time next week."
    You travel faster than the internet, lucky you, ahahahahahah.

    ๐Ÿ“ Using gears to match speeds
    15 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 11 Views ยท 2 Likes
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    Hi Roy, sorry for the digression.

    I don't want to create constants.
    This practical experiment (which I would have already done if I had had everything I needed) will give easily interpretable results.
    In my opinion the results will be significant and not misleading.
    All parameters will be the same: weight applied to the winch, supply voltage, technical data of the motor. We are not interested in reading the actual number of revolutions, we will only read the value of the electric current because from that I will understand which engine is working harder.
    Which motor is demanding more current from the battery and is therefore more likely to heat up.
    Logically by rpm, I mean the nameplate data, not the actual data.

    ๐Ÿ’ฌ Re: Construction report whaler Rau IX 1 : 45
    15 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 6 Views ยท 1 Like
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    ๐Ÿ’ฌ Add Comment
    Everything is progressing in the best way and very quickly.

    ๐Ÿ“ Using gears to match speeds
    15 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 11 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hi Ron, forgive me, you're right but I had this curiosity.

    It's true the topic is different but it's not the first time it's explored other fields, before me there's a long list of confessed criminals who have already committed this crime, ahahahahaha.

    Roy cited an A+ from his son and I couldn't resist.
    It's a wonderful thing to hear how things work in other parts of the planet, not on the internet but using the internet (the internet as a medium and not as a source of information).
    Is it the same in Canada as in the UK that you know?

    To think that in Australia or Canada there is someone who is building boats like me and I can ask him for information directly is fantastic.

    ๐Ÿ“ MANUFACTURERS AND SELLERS OF NAUTICAL PROPELLERS FOR RC MODEL BUILDING (USEFUL LINKS FROM ALL OVER T
    19 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 16 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Fantastic Toradog!

    Thank you so much for sharing this site.
    I will put it in the list and it will be very useful to everyone.
    I'm looking at it now, it's well structured and there's a lot of choice.

    ๐Ÿ“ MANUFACTURERS AND SELLERS OF NAUTICAL PROPELLERS FOR RC MODEL BUILDING (USEFUL LINKS FROM ALL OVER T
    21 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 16 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hello to all naval modelers.

    I especially wanted to warn those who find this list of propeller manufacturer sites (not just sellers) useful and who have already copied and pasted, that I have updated the aforementioned list in the first message.
    I have added another site with a short description.

    ๐Ÿ“ Using gears to match speeds
    21 hours ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 16 Views ยท 3 Likes
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    ๐Ÿ“ Reply
    Good morning everyone.

    Leaving the opinion of Roy and all the modelers pending and awaiting the practical experiment that I intend to do as soon as possible, the question of A+ as a grade came to mind.

    I was intrigued and I would like to know how it works in the UK and if it is also like this in Anglo-Saxon speaking countries.
    In Italy it is roughly like this:
    1. Up to the age of four, children go to nursery school (they play with them and do drawings or manual work).
    2. Ages five to ten go to primary school (once called elementary school) for five years.
    Until some time ago, ratings were given by adjectives such as: excellent, good, fair, sufficient, mediocre, ineffective. Today they use letters A to D (along with a verbatim report) but there are no more failures. In primary school today no one repeats the year. It is a compulsory school.
    3. From eleven to thirteen years old they attend lower secondary schools (once simply called middle schools) for three years. The evaluation is made with numbers from 0 to 10, up to 5 you are insufficient, from 6 to 10 you are promoted. It is the same for everyone and is mandatory.
    4. From fourteen to eighteen years old they go to a high school (now called secondary school) for five years. It's optional.
    You can choose between various types which already lead towards subsequent humanistic, technical or scientific studies or towards a profession.
    For example, there are: Scientific High Schools, Classical High Schools, Linguistic High Schools, Industrial Technical Institutes (electronic, electrical, mechanical, IT, telecommunications, nautical, etc. etc.), Technical Institutes for Surveyors, Commercial Technical Institutes, etc. etc.
    The votes are numbers from 0 to 10 (accompanied by detailed textual explanations), up to 5 you are insufficient and from 6 to 10 you are promoted.
    5. After graduating from high school you can enter university. The master's degree lasts a minimum of five years and you can become: doctor, engineer, architect, lawyer, physicist, mathematician, chemist, man of letters, psychologist, philosopher, etc. etc.

    I would like to know how it works in your countries.

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    ๐Ÿ’ฌ Re: CGINGA1V
    2 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 13 Views ยท 0 Likes
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    Hi ChrisG, thanks for the information you sent me privately. very kind.
    I have inserted the data of the Inga 1V in the first text of the link below.
    If there are errors, tell me,
    Yes, you're right, maybe you might have to put a propeller with a larger diameter. In this case, pay attention to the engine.

    I'd like to include your other works too.

    ๐Ÿ’ฌ Re: Baby Bootlegger
    2 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 16 Views ยท 4 Likes
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    It seems to me that the turns aren't that bad, all things considered.
    It actually gives me the impression that it could go faster and there's a lot of air coming out of the back.
    It can be improved but it's not a disaster.

    One thing is for sure if we send air (due to a possible cavitation problem) instead of water on the rudder, it will definitely have problems even if it is perfect.
    It is worth following River Rat's advice, especially because he has gained experience on a model very similar to yours.

    ๐Ÿ“ As Requested for AlessandroSPQR Thesis
    2 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 15 Views ยท 1 Like
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    ๐Ÿ“ Reply
    Don't worry, it's not mandatory.
    The relationship is only between vessel length and diameter.

    The other data, such as: the weight, the number of blades and the material can be useful to those who want to make a choice starting from zero information.

    For example, two identical long boats have a different relationship, even if only slightly.
    Let's analyze in detail and discover that the one with the larger propeller is heavier.
    It is coherent and the reader will have more general guidance.

    The type of transmission is one of these non-mandatory data.

    ๐Ÿ“ As Requested for AlessandroSPQR Thesis
    2 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 15 Views ยท 1 Like
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    ๐Ÿ“ Reply
    Hi Ron, sorry for the delay, I added your ships to the report list in this link.
    If there are any errors, tell me.



    forum/135991#135991
    ๐Ÿ“ Using gears to match speeds
    3 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 22 Views ยท 3 Likes
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    ๐Ÿ“ Reply
    Actually, even better.
    Consider only one engine.
    Measure once with the reducer and once without.
    What outcome do you foresee?

    ๐Ÿ“ Using gears to match speeds
    3 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 22 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Sorry Roy, but to answer the question I asked you (two experiments hypothesis), consider two identical engines. Identical means equal rpm (before putting the gear reducer). Afterwards one will logically have fewer turns than the other. Same supply voltage (which we will not vary) and same power as the motor's data on the plate. In these conditions, in your opinion, which of the two motors will absorb more current, the one with the gear reducer or the one without?

    ๐Ÿ’ฌ Re: Baby Bootlegger
    3 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 22 Views ยท 2 Likes
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    ๐Ÿ’ฌ Add Comment
    Hi Peterd, I'm rooting for you.

    In my opinion you will already get some improvements.
    At the limit you can always increase the surface of the rudder or create one with an asymmetrical biconvex section.

    Hello Mike.
    Your system is not useless at all. In my opinion it is effective.
    The deflecting surface triples, the water flow is conveyed better and there is no need for three axles.
    The only drawback could be (but this is a personal taste) the aesthetic factor.

    ๐Ÿ“ Using gears to match speeds
    3 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 24 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hi Roy.
    First of all thanks for your answer.

    I tried to reread your message several times but I'm not sure I understood everything. In fact, unfortunately, through my fault, I understood very little.
    It often happens to me that, if I have to write from Italian to English, something more or less comprehensible may come out but incomprehensible translations come out from English to Italian.
    Some key terms are not only mistranslated but completely misrepresented, making it impossible to translate the sentence correctly.


    This time I was unable to understand the connection between some parts of the speech and the connection with the main question I asked you.

    I understand that you helped your son with a physics test and that your son got an A+.
    I guess A+ is the highest grade. Our system is different, it is not based on letters but on numbers or adjectives.
    I won't write here how it works so as not to burden the discussion, perhaps I will do it in another message.
    I can tell you, however, that I had no doubt that your son, thanks to you, would get a good grade.

    Returning to my question, I wanted to submit this reasoning to you.
    Let's see what you think.

    It is true that the reducer is a gear system that has its own efficiency. Let's say 95% for example because with friction some of the energy will be lost.
    However, by decreasing the rotation speed, the reducer will increase the torque. For example, if you halve the speed you double the torque.
    Tell me if what I have written so far is correct.

    Saying that the torque increases means that the engine requires less force to do the same work.
    Is this correct?

    Now I don't want to deal with the complex discussion of gears but I would like to draw a parallel (if it is possible) with pulleys.
    Those who build the masts and running rigging, like us, are certainly familiar with these concepts and these examples.
    That's why I use them.

    1. A single fixed pulley cannot be considered a true lever. In fact, if I have to lift a 100 N weight, with a fixed pulley I will have to apply a force of 100 N (first image attached).

    2. A single mobile pulley is a second class lever (I remember even if everyone knows that the second class lever is always advantageous). In fact, if I have to lift a 100 N weight, with a fixed pulley I will have to apply a force of 50 N (second image attached).

    3. With two pulleys (compound pulley), one fixed and one mobile, you obtain the same result as in point number two (third image attached).

    4. With two mobile pulleys, if I have to lift a 100 N weight, I will have to apply a force of 25 N (fourth image attached).


    In reality we know very well that we will never be able to halve or divide the effort into four because there is friction.
    The more postponements you make, the more friction dominates, so much so that it is no longer convenient beyond a certain number of postponements.

    However, it is clear that a person using a hoist makes less effort than a person pulling the weight directly.
    Here, I would like to compare the person to an electric motor and the gear system to the hoist.


    So the question could be reduced to this experiment.
    I take two identical electric brushed motors, to one I directly connect the shaft for the propeller and the propeller.
    To another I first connect the gearbox and then the shaft for the propeller and the propeller.
    I put an ammeter in series (paying attention to the motor plate data so as not to exceed 10 amps) and measure the consumption before one and before the other while the propeller turns in the water.
    In your opinion Roy, but also in your opinion, which of the two will be the motor that consumes more current?
    In my opinion (but I could be wrong) the one without a gearbox consumes more, because the effort will be supported entirely by the electric motor and will not be reduced by the gearbox.
    But I'm curious to know your opinions on the matter and to see the result of the experiment.
    If the amperage exceeds 10 amps (typical of the second fuse of normal testers) it is better to use a current clamp which however is much more expensive.

    Alternatively, if the difference in amperes is too small to be able to establish who consumes more, we can do this:
    I take two identical electric brush motors, to one I connect a spool with a wire and to another I first put a reducer and then the spool with the wire.
    I have a weight lifted, attached to the wire.
    The one without the reducer will be tested first and the current absorption will be measured.
    Then the one with the reducer will carry out the test and the current absorption will be measured.
    Same question.

    I plan to do it as soon as I buy a gear reducer, two identical propeller shafts, two identical couplings and two identical propellers, I already have the identical motors.
    Anyone who already has all the material can do this experiment and report the results to us, perhaps documenting them with a video.

    ๐Ÿ’ฌ Re: Baby Bootlegger
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 44 Views ยท 5 Likes
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    Hi Peterd.

    You have definitely improved the situation.

    Unfortunately the axis (the vertical pin I mean) of the rudder is too far forward. As already mentioned, it would be better to move it back but it is a fairly invasive and complicated job.
    So it's best to see how these changes go first, if they produce the desired effect, nothing else needs to be done, I hope so.

    I would have done a different profile, roughly following the red outline. The green outline is optional.

    However, I repeat, it could already go well like this, let us know how the tests in the water go.

    ๐Ÿ“ As Requested for AlessandroSPQR Thesis
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 32 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hermank is absolutely right, very good Ronald.

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    ๐Ÿ“ Using gears to match speeds
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 38 Views ยท 2 Likes
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    Hi Ronald, thanks for sharing the pdf, there are many useful and interesting indications.

    I really liked this method, I find it simple and brilliant:

    "Chuck the motor shaft in a drill press that runs at a known speed (e.g., 3600 rpm);
    While running your motor as a generator, measure the voltage across the leads (maybe you measure 1.2 v);
    Divide rpm by volts- in this example, 3600 / 1.2 = 3000. This is the approximate motor constant K, = RPM/V. Multiply K by desired running voltage to get free running speed. Example, at 7.2v, free running speed = K x V = 3000 x 7.2 = 21,600 rpm."

    ๐Ÿ“ LEDs
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 17 Views ยท 2 Likes
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    Right ColinH, exact words, I agree with you.

    There are no problems with low voltages and low currents.
    The important thing is not to improvise with circuits and devices that use mains voltage (230 volts).

    ๐Ÿ“ Using gears to match speeds
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 38 Views ยท 2 Likes
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    ๐Ÿ“ Reply
    Hi Roy.

    I agree with everything you wrote.
    The stall current rule of thumb that you laid out is very interesting.
    Maybe I didn't understand something because of the translation so I'll ask you directly:
    In your opinion, all other things being equal, is a geared motor subject to less strain than a direct drive motor?
    In my opinion certainly yes, but I want to listen to your opinion and your explanations which matter a lot to me.

    ๐Ÿ“ LEDs
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 21 Views ยท 2 Likes
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    Don't worry PhilH.

    ๐Ÿ“ Have you ever seen a seagull chasing a fast RC model of speedboat?
    4 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 27 Views ยท 1 Like
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    Hi RossM.

    Now I don't want to reopen a long debate like the "gaff sail", hahahahahahah.
    I don't know if the seagull just wanted to investigate or wasn't actually able to grab the motorboat even though he wanted to.
    I believe (but this is just my personal opinion and yours are equally valid) that, due to the shape of its wings, the seagull is unable to make sharp turns.
    Regaining space at the top makes it widen the curvature. Essential for the type of wings it has.
    Seagulls have evolved a certain type of flight that is different from that of hawks.
    The goshawk, on the other hand, can change direction in a very short space and immediately.
    Maybe it's because I love birds of prey (hawks, eagles, buzzards, kites, goshawks, harriers, etc. etc.) but I think it's like this.

    In the next tests for fast motorboats the escape from the seagull will be included, ahahahahahahah.

    I don't know if it's like this here too (in the rest of the world I mean), but here in Rome, for about thirty years or more, numerous colonies of seagulls have settled.
    Although the seagull is an absolutely maritime bird, it has adapted very well to the city.
    In part they hunt other animals (rodents, fish, pigeons and other birds) in part they rummage in landfills and take advantage of the garbage.
    They have no rival and have divided the territory with the gray crows (Corvus Cornix) who seem to be the only ones who can stand up to them.

    ๐Ÿ“ Have you ever seen a seagull chasing a fast RC model of speedboat?
    5 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 39 Views ยท 2 Likes
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    If you notice, every time he has to take a turn, he climbs first.
    If it had been a goshawk [accipiter gentilis], (assuming it was interested in hunting) it would not have done so and it would have captured the object much more easily.
    But perhaps the seagull only wanted to see it up close.

    ๐Ÿ“ Have you ever seen a seagull chasing a fast RC model of speedboat?
    5 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 71 Views ยท 10 Likes
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    ๐Ÿ“ Reply
    Here it is.



    ๐Ÿ’ฌ Re: Typhoon
    5 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 25 Views ยท 0 Likes
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    ๐Ÿ’ฌ Add Comment
    Added to the list of the first message in the link below.

    Thank you very much River Rat, this is a model that many like and falls into a category of fast but very streamlined motorboats.
    It will be interesting to compare your magnificent model with other interpretations.
    I inserted both the ratio with 35 mm propeller and with 37 mm propeller, because in both data the topics are different.



    forum/135991#136236
    ๐Ÿ’ฌ Re: Baby Bootlegger
    5 days ago by ๐Ÿ‡ฎ๐Ÿ‡น AlessandroSPQR ( Captain)
    โœง 55 Views ยท 2 Likes
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    ๐Ÿ’ฌ Add Comment
    Hi Peterd.

    Yes, just as I was telling you, the rudder responds better to high speeds because currently only a small part is affected by the propeller flow.
    If well hit by the flow of the propeller, a good rudder will make you turn the boat even when stationary, if you hold it with one hand.

    However, don't expect too sharp curves, even real boats (if they don't have bow thrusters) don't do what many modelers would like to do.



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