A Skipjack in Ireland

[The Boattrainman]

The motor/gearbox is trial fitted, despite careful measurement it doesn't align with the shaft.




A 2mm plate of styrene is just right to get it in line, I've made an alignment tool from short lengths of tube.




The motor with universal coupler is now perfectly in line with the stuffing tube, and a dummy shaft is trial fitted.





The Boattrainman

[The Boattrainman]

Incidentally, David happened to mention Archimedes in passing. A little known fact is that Archimedes was Irish.

The name probably comes from Altán O'Meath (and mangled by the locals into Archimedes), there was a large number of Irish immigrants (especially from County Meath) in Syracuse from 200 - 300BC, probably fleeing from the (again little known) first Irish Famine of the same period. Apparently, his family arrived around around 290BC and he was born in 287BC.

As he grew up, basically an outsider, the only avenue to make a living (as most trades were a closed shop at that time) was to participate in dangerous sports, and he took up Bath Diving for a time, in which athletes would risk their lives by jumping from a great height into shallow basins of water (he was an expert at the 10m event). Very popular at the time given the risk of injury and death, the sport eventually becomes the modern version we see today at the Olympics (the bath replaced by a pool).

Anyway, it was in executing these various dives that he came up with his famous method for measuring the volume of odd shapes, and he was famous for giving a loud shreik followed by his Mother's name Aoife (Ahh--Aoife, pronounced Ahh---eefah), hence the legend that became 'Eureka'.

This kicked off his mathematics career.

He had a sad end, killed by the Romans when they sacked the city in 212BC during the Punic Wars, his famous last words (although we will never know for sure) were 'noli turbare circulos meos' which is usually mistranslated as 'leave my circles alone' when in fact it means 'leave my potatoes alone'........turbare (derived from tuber i.e, potatoe).

Archimedes the Irishman, look it up, it's all true.

The Boattrainman

[He Who Shall Not Be Named]

Incidentally, David happened to mention Archimedes in passing. A little known fact is that Archimedes was Irish.

The name probably comes from Altán O'Meath (and mangled by the locals into Archimedes), there was a large number of Irish immigrants (especially from County Meath) in Syracuse from 200 - 300BC, probably fleeing from the (again little known) first Irish Famine of the same period. Apparently, his family arrived around around 290BC and he was born in 287BC.

As he grew up, basically an outsider, the only avenue to make a living (as most trades were a closed shop at that time) was to participate in dangerous sports, and he took up Bath Diving for a time, in which athletes would risk their lives by jumping from a great height into shallow basins of water (he was an expert at the 10m event). Very popular at the time given the risk of injury and death, the sport eventually becomes the modern version we see today at the Olympics (the bath replaced by a pool).

Anyway, it was in executing these various dives that he came up with his famous method for measuring the volume of odd shapes, and he was famous for giving a load shreik followed by his Mother's name Aoife (Ahh--Aoife, pronounced Ahh---eefah), hence the legend that became 'Eureka'. This kicked off his mathematics career.

He had a sad end, killed by the Romans when they sacked the city in 212BC during the Punic Wars, his famous last words (although we will never know for sure) were 'noli turbare circulos meos' which is usually mistranslated as 'leave my circles alone' when in fact it means 'leave my potatoes alone'........turbare (derived from tuber i.e, potatoe).

Archimedes the Irishman, look it up, it's all true.

The Boattrainman

It's official: I have been 'schooled'! big-time.

David

[The Boattrainman]

A collar of 0.5mm styrene, 3cm wide to the outer diameter of the tube is made. The position of the outer compression rods are marked, the collar has to be so thin so it will go under the retaining rods.




U-section strips are glued at the four points, the collar is then trial fitted to ensure all is in line.




The collar will retain the rods in position when the forward end cap is removed for charging, the retaining pieces are drilled to stop air/water getting trapped and reinforced with quarter round rod strips.




The collar free floats along the tube and can be positioned away from resting points and fixtures, it's tight enough not to move once the rods are inserted.




The Boattrainman

[The Boattrainman]

The completed retaining collar with some 3mm X 1mm strips of styrene for strength, 3mm brass rods simulate the threaded rod (lost in the post!).





The Boattrainman

[HardRock]

Incidentally, David happened to mention Archimedes in passing. A little known fact is that Archimedes was Irish.

The name probably comes from Altán O'Meath (and mangled by the locals into Archimedes), there was a large number of Irish immigrants (especially from County Meath) in Syracuse from 200 - 300BC, probably fleeing from the (again little known) first Irish Famine of the same period. Apparently, his family arrived around around 290BC and he was born in 287BC.

As he grew up, basically an outsider, the only avenue to make a living (as most trades were a closed shop at that time) was to participate in dangerous sports, and he took up Bath Diving for a time, in which athletes would risk their lives by jumping from a great height into shallow basins of water (he was an expert at the 10m event). Very popular at the time given the risk of injury and death, the sport eventually becomes the modern version we see today at the Olympics (the bath replaced by a pool).

Anyway, it was in executing these various dives that he came up with his famous method for measuring the volume of odd shapes, and he was famous for giving a loud shreik followed by his Mother's name Aoife (Ahh--Aoife, pronounced Ahh---eefah), hence the legend that became 'Eureka'.

This kicked off his mathematics career.

He had a sad end, killed by the Romans when they sacked the city in 212BC during the Punic Wars, his famous last words (although we will never know for sure) were 'noli turbare circulos meos' which is usually mistranslated as 'leave my circles alone' when in fact it means 'leave my potatoes alone'........turbare (derived from tuber i.e, potatoe).

Archimedes the Irishman, look it up, it's all true.

The Boattrainman

In fact he was an Australian. Archie Mendes - a builder from Melbourne who did his apprenticeship during the (little known) first Australian financial stimulus package of 293BC. When his father, Bob decided to return to his native Greece, the whole family of 16 brothers, sisters and of course, Mrs Mendes went along too.

Arriving in Syracuse, Archie took up work as a builder and tinkered with mathematics in his spare time. Being an Australian, he was naturally averse to bathing and a virtual compendium of stories grew about Archie, his bath and the wild excuses that he made up to avoid getting into it. He was regularly followed around town by a small mob who would remind him of his resulting stench by shouting at him,”You reeka”! (Greek for “You stink”) And it was true; he did.

He eventually met a Roman soldier who took exception to his slack personal grooming skills and killed him. Poor ******* never made it back to Australia.

And if you believed the Boattrainman you probably believe this too!

[The Boattrainman]

Hi Hardrock,

I humbly beg to differ, I think you are confusing him with Archie Menendez, world Indoor Hang-Gliding Champion and inventor of the Rotary Toilet. He was from Australia all right, but was deported to the USA and died in penury in 1867.

Next you'll be telling us that an Irishman J. P. Holland from Cork was the father of modern submarining, you'll never get me to swallow that one!

Rob

[He Who Shall Not Be Named]

what have I done?.....

[HardRock]

Wasn't Menendez the man who brought the left handed screw driver to America?

[The Boattrainman]

A stuffing tube (3 inch, the shortest I could find) is pushed into the shaft hole, a surround of styrene is filled with epoxy to seal the joint. Not my neatest work, I'll be filling and sanding this later.




The inner shaft is cut down and a flat filed into it to take the outer coupler.




A plastic gauge is made from scrap styrene to set the linkages from the rudders and rear dive planes as they are on slightly different levels, in preparation for installation of the servos and linkage holes.




The Boattrainman

[The Boattrainman]

This fitting can now be sorted, it will carry the throw of the dive plane servo, reversing it's direction out of the WTC. It's held in place by these styrene fittings, one at the bottom of the hull another at the top.





The fitting is installed and removed, by pressing the hull inwards and as it's not glued in, it drops out.




The Klik On magnet is installed on the servo arm, the other magnet is on the end of the snake rod going to the front dive planes.





The plastic snake will bend downwards when the hull is opened up, and you just pull the magnet off (a safety ring ensures it stays on during operation).




This is the top hull in place , opened up at the breakpoint, the lower arm of the servo rod will go to the rod coming out of the WTC from the forward dive plane servo.




The Boattrainman

[Albion]

What seals are in the stuffing box tube ? The piston tank is going to pressurise the etc when you dive, if that just a close clearance tube, I suspect it's going to leak badly as the tank fills.

[The Boattrainman]

Hi Albion,

It's a prop tube from Model Bits, I suspect you might be right, I'll stuff it with silicone grease and there will be a mini O ring compressed against a thrust washer, that's why I've cut the shaft to exact length. The photo is just for demo purposes, the O ring will be on the inside.

Worked for the 750ml piston tank on my Robbe U203, I just replaced the O ring every 3/4 sessions, the few bubbles coming out of the shafts told me the O ring was toast.

so



Those markings are the lines along which the servo arms can exit the WTC so that they line up the arms from the rudder and dive planes.

Rob

[The Boattrainman]

A 3mm slot is filed in the centre of the rest points to hold the lower outer rod on the WTC.




The lower rod sits in this groove and doubles as end cap holder and keeps the WTC in place.




The steel pushrods are all replaced with brass rods and brass clevises and checked again for straight alignment.





The Boattrainman

[reddevil]

One question about the shaft and its sealing Are you sure the method you're using is really watertight? Because I once asked ENGEL about using that kind of drive shafts with sleeves, and the answer waas that they weren't watertight