Project type XXI scale 1/96

[MFR1964]

Got the lead shifted on the keel, now she lays straight in the water, as well under water.



Added some new antenna wires on the outside, she will be tested in this colour, once done i can think about the permanent paintjob.


Only thing i added, was a extra floodhole at the back, since that is a removable part i need to vent it seperatly.

Manfred.

[MFR1964]

So, they'll 'work' just like the Walther boats?

Not really, i can extend them, but to the lack of room gobbled up by the foam, can't tilt them.

The type 17b uses a wingshaped foil to counteract poor handling at low speeds, hope to get some results with that if i got some more drivingtime under the belt, the swimmingpool in Germany will be the ideal testinground.

Manfred.

[redboat219]

So, they'll 'work' just like the Walther boats?

That's an idea worth exploring.
Like the diveplanes on the Type 206.
Dive planes are at fixed angle and are extended and retracted to initiate change in depth.

[He Who Shall Not Be Named]

Only for tilting the dive-planes,the mechanism for extending them is in the lower part of the boat, so no issue's with that

Manfred

So, they'll 'work' just like the Walther boats?

[MFR1964]

Only for tilting the dive-planes,the mechanism for extending them is in the lower part of the boat, so no issue's with that

Manfred

[redboat219]

for tilting the dive planes up and down only or even the deploy/ retract mechanism?

[MFR1964]

Romel,
There is no room left at the front to get my steeringrod at it's place, i need that piece of foam to get me balanced underwater.


Manfred.

[redboat219]

Manfred, what do you mean by "the front dive-planes up/down is off the record"

[MFR1964]

Trimmed the XXI, and some work on the Spirou which will be updated at it's thread.


It took this amount off foam to get her balanced under water, because i needed a big chunk of foam at the front steering the front dive-planes up/down is off the record, so be it.


Balanced under water, just the top of the sail above the water, i can do it this way since the schnorkelmast is used to suck air in to bring the boat up.




As well under as above water she is listing to the right, i'll have some lead to shuffle around, within a few weeks i have a meeting in Germany in a swimmingpool, so there will be the maiden- voyage, first sort out the listing and make her ready for the maiden.


Manfred.

[MFR1964]

Did some testing with the SD, slapped on some paint and made the first plunge in the testpool,


Since i had problems with retracting the dive-planes on some occasions i decided to build a guide which will prefent the planes to droop down.


Tested the SD, only one O-ring was leaking, made a easy fix by placing another O-ring glued in with 2K Epoxy, for now she's watertight.




Since we have a good week with sunshine and higher tempartures, slapped some primer on the boat, revealing all the nice details.



Also got some paint on all the things which will be placed at the conningtower, when trimming everything has to be present at the model.



Did the first plunge into the testpool, like a proper Uboat she went to the bottem as a brick, it took this amount of foam to get her near the waterline, opened up the ballasttank and again she went for the bottum, have to add much more foam at the deckpart.
Once this is done, iŽll be back with the results, to be continued.

Manfred.

[MFR1964]

If the XXI was on 1/72 scale it might work, but at this scale you don't have the room to get it in.

Manfred

[redboat219]

Maybe David still has some 1/96 torpedoes.

[MFR1964]

Did some work on the forward bulkhead, and started testing if everything works.


Placed some stronger servo's and added a smaller one for steering the dive-planes up and down.


Took apart the mechanism for extending the dive-planes, the throw was not good enough to extend them all the way.


By using a small lever i was able to get me some more throw.


Everything ready to be tested on the workbench.

https://youtu.be/G8GJ9_govt4?si=YoTS1QibGsgTw4bg

Made a vid to show how everything works, now it's on to test the SD in the wet to see if she is watertight, from that stage i can thinking about giving the boat the plunge into the testpool, to be continued.


Manfred.

[MFR1964]

Reglued the housing and made it fit inside the hull,


Took some epoxy-glue and sealed the housing, used the clamp for keeping things together.


Glueing it together with epoxy-glue did the trick, it's watertight, did some testing to see if waterhammering would occure using the gears, both directions work without problems.


This way the housing will be connected to the SD, if the housing turns warm the overpressure will go to the SD which has a greater volume inside.


Took out the old motor foundations, those where only attached with some CA.


A testfit if there is enough room to place the housing, by placing it on a slight angle there is just enough room.


Made some copper straps to keep the housing at it's place, when needed you can loose the screws and take it out.


Everything connected, except the shafts, did some testing, for now everything works fine.


Did some testing on the forward dive-planes and torpedo shutters, those tiny servo's don't have the power to move things which demand a bit more force, have to change them for some stronger examples


Manfred.

[MFR1964]

Drilled out all the floodholes, this took me almost a week, doing it a few at the time, some more work on the housing of the E-motor and a bummer while testing it for watertightness.


This is how she stands now, all floodholes opened and as a test added some antenna wires from small copper wire, have to replace them in the future for the permanent version.


Closed the panel which a had to cut open with some rtv, since you can remove the upperdeck made a pin attached to the front antenna-wire which you can remove.


It's just a pressfitt, the pin will stay at it's place when needed.



Added some flat lead to counteract the weight of the conningtower, in the future i have to see if i need more lead during trimming.


First stage in closing up the housing, added a styrene plate to isolate the electric connections


Pushed in the styrene plate, ready to be sealed with RTV.


Geared side sealed with RTV.


Rearpart sealed with RTV, the electrical connections are sealed with Epoxy glue, also glued in the wires since they will be moved around in the future while connecting to the main SD, hopefully it will prefent the cables from breaking.


Made the connection on the SD for attaching the motor housing, giving me two things at once, i can pressure test the SD and the motor housing seperatly.


This was the bummer, gave some light pressure on the housing and it was not sealed enough, i suspect the pressure was still too high for the RTV.

Will repeat this test when the housing is sealed with Epoxy glue, giving me more strength on the endcaps, some times thing work, other times you have to come with a different solution, so back to the drawingboard.


Manfred.