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Liked AWOL, MIAor KIA! 5 days ago
United States
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📝 Sealing a horizontal prop shaft
4 hours ago by 🇺🇸 ToraDog (
Commodore)
Commodore)✧ 8 Views · 2 Likes
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Eric,
There are a number of ways to achieve what you seek, from simple to complex. The latter involves actually using cup seals, this is regularly used by submarine drivers, the o-ring in the stuffing box is another effective method, but your model is already built so it may be impractical. Grease in the stuffing box, especially if added via a grease tube, can be very effective. One way to increase that effectiveness is to place a nylon washer over the shaft, on the inboard end of the stuffing box, and hold it snug against the stuffing box with a shaft collar. This really helps to prevent the grease from being pushed out of the SB by water pressure.
I am sure there are many more suggestions out there and hope someone else will add.
There are a number of ways to achieve what you seek, from simple to complex. The latter involves actually using cup seals, this is regularly used by submarine drivers, the o-ring in the stuffing box is another effective method, but your model is already built so it may be impractical. Grease in the stuffing box, especially if added via a grease tube, can be very effective. One way to increase that effectiveness is to place a nylon washer over the shaft, on the inboard end of the stuffing box, and hold it snug against the stuffing box with a shaft collar. This really helps to prevent the grease from being pushed out of the SB by water pressure.
I am sure there are many more suggestions out there and hope someone else will add.
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JOHN
AlessandroSPQR
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📝 "New" Kid on the Block: Meus Racing?
3 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 7 Views · 0 Likes
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The US Navy used the ELF to keep in touch with it's nuc boomers. I thought about renting some band width to run my sub while tracking it on the SOSUS network which it now busy tracking whales. Thank you Pentagon for $$ well spent!😂😂😂
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📝 Smoke generator - question
5 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 49 Views · 3 Likes
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I'll throw my support behind the Dean's Design units. I have two of them and they work well.
Best part is that when I test them in the house, I don't set off the Fire Alarm! The local gents seem to appreciate that.😊
Best part is that when I test them in the house, I don't set off the Fire Alarm! The local gents seem to appreciate that.😊
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SimpleSailor
hermank
Wolle
📝 Steam Glorious Steam.
5 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 49 Views · 5 Likes
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Good Morning All,
Someone please correct me if I am wrong, but most marine power systems, be they steam from coal or oil, if burning correctly, would emit a grey smoke, and not too much of it, except under severe load conditions. The real except is wood fired boilers which smoke like a banshee.
All that said, the smoke machines currently available commercially as well as those homemade unit do a pretty good job of simulating the real thing.
I would also point out that any unit that smoked "black" would, as Lew has pointed out, make a mess. If you think that dust is hard to removeform your model, you ain't seen nothin' yet.😆
Someone please correct me if I am wrong, but most marine power systems, be they steam from coal or oil, if burning correctly, would emit a grey smoke, and not too much of it, except under severe load conditions. The real except is wood fired boilers which smoke like a banshee.
All that said, the smoke machines currently available commercially as well as those homemade unit do a pretty good job of simulating the real thing.
I would also point out that any unit that smoked "black" would, as Lew has pointed out, make a mess. If you think that dust is hard to removeform your model, you ain't seen nothin' yet.😆
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chugalone100
hermank
stevedownunder
GaryLC
RodC
📝 AWOL, MIAor KIA!
6 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 52 Views · 2 Likes
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Doug,
I am so glad that you have weathered the storm. They seems to come more frequently and with greater intensity at this age.
Happy Yamato Day.
I am so glad that you have weathered the storm. They seems to come more frequently and with greater intensity at this age.
Happy Yamato Day.
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jumpugly
hermank
💬 Re: Hanging in there
9 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 21 Views · 1 Like
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Is that a UCO? (unidentified crawling object)
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hermank
💬 Re: A video at last
17 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 35 Views · 4 Likes
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Sweet! What is all that shimmering blue stuff? i don't recognize it.😁
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chugalone100
DWBrinkman
hermank
Chum444
💬 Re: Juneau
20 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 18 Views · 1 Like
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Chum,
She is no better than your beautiful work. And, you put out 10 for every build I manage. six more inches of lovely white spring rain... plenty of motivation to stay in and build models! Besides, the lakes are white, and very solid!
She is no better than your beautiful work. And, you put out 10 for every build I manage. six more inches of lovely white spring rain... plenty of motivation to stay in and build models! Besides, the lakes are white, and very solid!
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Chum444
📝 Juneau
21 days ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 25 Views · 4 Likes · 2 Comments
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Finally added stanchions and railings to the superstructures. Pretty much done except for deck stanchions and railings, which will wait for successful trials, if and when the the lakes turn back too a liquid state.
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RNinMunich
Ronald
Chum444
hermank
📝 WW 2 and radar
4 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 47 Views · 5 Likes
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Interesting chat. The Oahu radar was aSCR-270 radar. They were quite effective, once they were believed in. One was mounted on the south facing peak of Cadillac in Acadia National Park, Bar Harbor, Maine in 1942 It was tower mounted at an elevation of around 1500 feet. The entire area was of course closed off to civilians, but the locals came to the conclusion that it was for spotting German subs and planes. Not quite. It was operated by the Army and the MIT Draper Radiation Labs. It simulated an airborne radar, as on might be carried by an aircraft. The return signal was beamed, as a TV signal to Hanscom Airfield, in Cambridge Massachusetts, ruffly 225 miles down the coast, where it( the image of the scope return, was displayed on a remote scope. Roy, you may see where this is going. Once the signal transmission issues were overcome, the next step was to put a radar in a plane, witch was done with the TBM Avenger being modified. Hence, the birth of airborne early warning radar. Everything was torn down post was. Not even a plaque to mark the achievement.
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stevedownunder
jumpugly
Chum444
roycv
hermank
📝 A question for our American shipmates.
8 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 34 Views · 3 Likes
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Lew is correct,
Buyer beware. That said, we are living in a world where someone else is always trying to control what we do. The williwags look better all the time, at least for the moment...
Buyer beware. That said, we are living in a world where someone else is always trying to control what we do. The williwags look better all the time, at least for the moment...
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RodC
Nickthesteam
hermank
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📝 A question for our American shipmates.
8 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 51 Views · 4 Likes
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Nickthesteam,
Yup.
I didnot mean to kick the hornet's nest... well maybe, "kinda sorta" as we say Downeast....😀
Yup.
I didnot mean to kick the hornet's nest... well maybe, "kinda sorta" as we say Downeast....😀
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Len1
hermank
Nickthesteam
Chum444
📝 A question for our American shipmates.
8 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 51 Views · 5 Likes
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Chumm,
Sorry, but I have to say this... your description sounds like our Attorney general....🙄🙄🙄
Sorry, but I have to say this... your description sounds like our Attorney general....🙄🙄🙄
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Len1
hermank
Chum444
Nickthesteam
RNinMunich
📝 A question for our American shipmates.
8 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 51 Views · 3 Likes
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"So Karen's actually exist?😀😀😀 "
Way, way, too many of them are out there.
USA is the land of entitlement.☹️☹️☹️
Way, way, too many of them are out there.
USA is the land of entitlement.☹️☹️☹️
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Len1
Nickthesteam
LeeA
💬 Re: Final launch day
8 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 22 Views · 3 Likes
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Very Nice! Great photos as well!😀
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Len1
hermank
AlessandroSPQR
💬 Re: Launch Day - Day 9
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 54 Views · 3 Likes
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Did he get to finish the bottle after the christening?😂
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DuncanP
Len1
📝 Question for Pat and the others as an alternative to AI.
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 21 Views · 2 Likes
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What Chumm said, plus, anodes also protect the different metals of a boat below the waterline. Dissimilar metals, bronze, stainless steel, steel, aluminum in a saline, or even fresh water environment, where Magnesium is the anode of choice, constitute a battery. Not to mention "stray currents, as Chumm mentioned, especially for boats hooked up to shore power,(AC).
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SimpleSailor
Chum444
📝 Mixing servos using a 40mhz TX
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 29 Views · 0 Likes
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I like Roycv's suggestion.
Also, what radio system and model are you using. If it is a computer radio, you should be able to set up mixes without any additional external mixer.
Also, what radio system and model are you using. If it is a computer radio, you should be able to set up mixes without any additional external mixer.
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📝 Propulsion; three props or other systems
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 24 Views · 3 Likes
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My V4-MA-1 tug has a Kort nozzle. The inside diameter is even bow to stern. The outside has an airfoil shape I had it turned from a piece of bronze according to the original Maritime Commission plans. It is a fixed Kort.
In my head, I would think that if the ID tapered, presumably front to back, it would negate some of the advantage of the Kort. Unlike air, H2O is not compressible( I think you knew that 😂) so thrust should not increase.
But, then what do I know???🤣
In my head, I would think that if the ID tapered, presumably front to back, it would negate some of the advantage of the Kort. Unlike air, H2O is not compressible( I think you knew that 😂) so thrust should not increase.
But, then what do I know???🤣
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Len1
Chum444
hermank
📝 Propulsion; three props or other systems
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 42 Views · 3 Likes
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Chumm,
Unless you are operating at the David Taylor Center( USN hydrodynamic research center for proving of ship/hull designs and characteristics in a scaled environment) I think that us modelers worry too much.
There are so many variables that effect a ship's response and we, as modelers, have almost zero control over the majority of them. How true is your prop? What is the actual pitch? How about drag coefficients? Are our power plants( motors) scale to the HP of the 1:1 ship? The list goes on.
In the end, it is a hobby, and we try to make our models work prototypically which really all we want.
Unless you are operating at the David Taylor Center( USN hydrodynamic research center for proving of ship/hull designs and characteristics in a scaled environment) I think that us modelers worry too much.
There are so many variables that effect a ship's response and we, as modelers, have almost zero control over the majority of them. How true is your prop? What is the actual pitch? How about drag coefficients? Are our power plants( motors) scale to the HP of the 1:1 ship? The list goes on.
In the end, it is a hobby, and we try to make our models work prototypically which really all we want.
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Len1
hermank
Chum444
📝 Propulsion; three props or other systems
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 42 Views · 4 Likes
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Allessandro,
Thank you for the correction!
Chumm,
Right handed and left handed props are equally efficient. So why did US Pt's have all like handed wheels? Expediency and cost. The choice of R vs L handed was based upon the engine rotation direction.
Why all three? It saved on the cost and weight of additional reverse gearing. The only down side to these decisions, that I know of, was a different turning diameter, Port vs Stbd.
In the long run, on our models it hardly makes any difference, except to scale appearance.
Thank you for the correction!
Chumm,
Right handed and left handed props are equally efficient. So why did US Pt's have all like handed wheels? Expediency and cost. The choice of R vs L handed was based upon the engine rotation direction.
Why all three? It saved on the cost and weight of additional reverse gearing. The only down side to these decisions, that I know of, was a different turning diameter, Port vs Stbd.
In the long run, on our models it hardly makes any difference, except to scale appearance.
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Len1
hermank
Chum444
AlessandroSPQR
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📝 Propulsion; three props or other systems
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 41 Views · 3 Likes
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Chum,
First, steam powered vessels were reversible, at least reciprocating drive one's were. Steam turbines are not, hence the addition of a reverse turbine. Early steam turbine plants generally lacked a reverse turbine. They would come later when turbine drive became more reliable, economic and sophisticated. Early turbines also lacked the HP relative to reciprocating engines.
Early in their development, steam turbines proved their worth as an easy way to add increased HP without bulk.
Looking at the design histories of later ships, the three engine plant was a compromise. The turbines had by this time become matured and the HP available from them was such that three shaft would provide the speed needed, without the internal space demands for
an additional turbine, boilers and fuel supply. This, in turn allowed the re-allocation of tonnage to other" more important" items, such as armor and armament.
There is an interesting correlation between anticipated range of a ship and the shaft arrangements. The USA, Britain, and Japan, quickly adopted the four shaft arrangement, while Germany, and Italy chose three shafts.
There is quite a bit more to this than what I present, but hopefully the idea is conveyed.
In the end, the shaft arrangement often reflects the HP available per shaft in relation to the speed target of the vessel.😊
First, steam powered vessels were reversible, at least reciprocating drive one's were. Steam turbines are not, hence the addition of a reverse turbine. Early steam turbine plants generally lacked a reverse turbine. They would come later when turbine drive became more reliable, economic and sophisticated. Early turbines also lacked the HP relative to reciprocating engines.
Early in their development, steam turbines proved their worth as an easy way to add increased HP without bulk.
Looking at the design histories of later ships, the three engine plant was a compromise. The turbines had by this time become matured and the HP available from them was such that three shaft would provide the speed needed, without the internal space demands for
an additional turbine, boilers and fuel supply. This, in turn allowed the re-allocation of tonnage to other" more important" items, such as armor and armament.
There is an interesting correlation between anticipated range of a ship and the shaft arrangements. The USA, Britain, and Japan, quickly adopted the four shaft arrangement, while Germany, and Italy chose three shafts.
There is quite a bit more to this than what I present, but hopefully the idea is conveyed.
In the end, the shaft arrangement often reflects the HP available per shaft in relation to the speed target of the vessel.😊
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Len1
hermank
Chum444
📝 Prop selection for triple (3) props
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 59 Views · 5 Likes
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The simple answer to the original problem, the boat pulling in one direction when accelerating, is to apply some opposite rudder. Full size boats due that, aircraft do that and the issue is solved. if you find that pull is constant then add rudder trim to correct it. KISS
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Len1
SimpleSailor
hermank
AlessandroSPQR
Chum444
📝 Prop selection for triple (3) props
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 60 Views · 6 Likes
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Chumm,
We have to put this in perspective. The last US ships built with three props were early(very) destroyers. After the steam plants developed and the turbines to match, two props became the rule.
However, foreign navies built three shafted ships right up to WW 2. See the German capital ships for example.
As to which combination proved most effective, that question needs to go to the engineers.
It certainly did not do Bismark any good...
We have to put this in perspective. The last US ships built with three props were early(very) destroyers. After the steam plants developed and the turbines to match, two props became the rule.
However, foreign navies built three shafted ships right up to WW 2. See the German capital ships for example.
As to which combination proved most effective, that question needs to go to the engineers.
It certainly did not do Bismark any good...
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Len1
Chum444
hermank
AlessandroSPQR
SimpleSailor
RNinMunich
📝 Prop selection for triple (3) props
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 56 Views · 4 Likes
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bruced,
I have a slightly larger scale ELCO. I do not experience the pull that you speak of and my props all rotate in the same direction, as per the original ELCO's.
I have a slightly larger scale ELCO. I do not experience the pull that you speak of and my props all rotate in the same direction, as per the original ELCO's.
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Len1
hermank
SimpleSailor
AlessandroSPQR
📝 Question of the Day?
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 56 Views · 4 Likes
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AlessandroSPQR,
Sadly, it seems that negative lessons are the only way we learn. ( see: USA)
Cheers all.
Sadly, it seems that negative lessons are the only way we learn. ( see: USA)
Cheers all.
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hermank
SouthportPat
Nickthesteam
AlessandroSPQR
📝 Question of the Day?
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 53 Views · 5 Likes
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Nickthesteam,
Your comment is exactly what jumped into my mind when I read this question. The second question I had was why that reasoning was missed by de Havilland?
I guess that water and air don't mix, at least not the engineers😂😂😂
Your comment is exactly what jumped into my mind when I read this question. The second question I had was why that reasoning was missed by de Havilland?
I guess that water and air don't mix, at least not the engineers😂😂😂
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hermank
SouthportPat
RossM
Nickthesteam
AlessandroSPQR
📝 Question of the Day?
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 48 Views · 6 Likes
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The Venetian lagoon? wasn't there a movie made made about that place. The Creature From The Black Lagoon?
I certainly would not swim in it.....🤣🤣🤣🤣
I certainly would not swim in it.....🤣🤣🤣🤣
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SimpleSailor
hermank
DuncanP
EdW
Steves-s
RossM
📝 Differential thrust for brushless motors
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 32 Views · 2 Likes
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I have seen, many times, where one of us is trying to increase the turning ability of their boat/s. Action Electronics made? or still makes a mixer that performs the function of increasing the outboard throttle when to appropriate rudder direction is called for, but I believe that works on only brushed motors.
Is there a way to do it for brushless motors? Yes.
I am learning this as a novice RC airplane pilot.
This system applies to brushless motors where two ESC's are used. It requires a "computer radio"( aren't they all now?)
The following link explains how to easily program the mixes and program the switches.
This system works very well on my Spektrum, I can attest to that, but is applicable any to descent radio.
Is there a way to do it for brushless motors? Yes.
I am learning this as a novice RC airplane pilot.
This system applies to brushless motors where two ESC's are used. It requires a "computer radio"( aren't they all now?)
The following link explains how to easily program the mixes and program the switches.
This system works very well on my Spektrum, I can attest to that, but is applicable any to descent radio.
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DuncanP
hermank
📝 Authentic operation for z-drives
9 months ago by 🇺🇸 ToraDog ( Commodore)
Commodore)✧ 34 Views · 3 Likes
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Gents,
Take a look at GoBilda servos. They can rotate 300 degrees. They are also re-programmable to to provide 360 degree proportional rotation.
Take a look at GoBilda servos. They can rotate 300 degrees. They are also re-programmable to to provide 360 degree proportional rotation.
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Len1
hermank
SimpleSailor
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