Robbe Type XXI - Build status

[sailorman]

Hi Y'all,

I want to keep you posted how my build is progressing.
The WTC and assosiated equipment tray are complete after 2 short evenings of work. The fit of all the parts are excellent and the instructions are clear and detailed. The infamous "screw joiner" has most definetely been improved. The next step will be constructing the outer hull. I expect this to proceed smoothly, I think the hardest part is done.
Take Care,
Steve

[tsenecal]

there are only two ways

there are only two ways they could improve the infamous "screw joiner"

1) mill it entirely out of one piece of stainless steel

2) throw it away and include a bayonette style joiner at the stern cap.

i doubt they did either

[sailorman]

The "screw joiner" has been

The "screw joiner" has been improved, the main shaft is now thick walled brass tube of a slightly smaller diameter than the theaded rod and bolt at either end. This requires that those parts are forcefully threaded into the tube along with soldering. I agree with your solutions, but after screwing these parts together and Silver Soldering (with plenty of flux) I feel confident in the part.
A bayonet ring would be fantastic, and I am concidering that for an "aftermarket" improvement to my boat. This is a kit after all. I dont know of any kits (from the major hobby supliers) that all 100% out of the box. This is where modeling and fabricating skills seperate the men from the boys. I am making many changes to this boat, as I go, but I do not feel that this reflects badly on Robbe. Robbe delivered what they advertised, "a fairly simple kit for the beginer". I can improve it to my standard due to my modeling skill.

[boatbuilder1]

Ok here are pics of

Ok here are pics of the new kit build up and contents
<img src="http://img.photobucket.com/albums/v330/capanderson/business/ACD21.jpg">

[boatbuilder1]

ok the tag didn't work

ok the tag didn't work so here is the links

http://img.photobucket.com/albums/v330/capanderson/business/ACD21.jpg

http://img.photobucket.com/albums/v330/capanderson/business/ACDB.jpg

http://img.photobucket.com/albums/v330/capanderson/business/ACDF.jpg

I will post more in the comming week and try like hec to get a review done by first issue of the coming year

[Guest]

Chuck, I took the liberty

Chuck, I took the liberty of correcting the image tags for you

[boatbuilder1]

thanks much appreciated http://www.subcommittee.com/forum/icon_biggrin.gif http://www.subcommittee.com/forum/icon_biggrin.gif

thanks much appreciated

[salt6]

Any updates?

Any updates?

[boatbuilder1]

ok here are more photos

ok here are more photos finally these are still beginning stages I have gotten the base frame done and pressure hull with endcaps robbe really thought this one out the directions are quite easy to follow and the photo referance is bueatiful
one gripe I have so far is the aft endcap is quite differant from the norm it consists of a die molded ring with the actual cap being vac formed I have my reservations as to the durability of it. although once it is adheared to the ring it is q bit more ridig I also have just completed the bow hull section
quite nice and very well done will post close ups some time next week
sorry for the delay guys I am being crush with work

http://img.photobucket.com/albums/v330/capanderson/business/ACD9.jpg

http://img.photobucket.com/albums/v330/capanderson/business/ACD15.jpg

http://img.photobucket.com/albums/v330/capanderson/business/ACD13.jpg

http://img.photobucket.com/albums/v3...ness/ACD11.jpg

[salt6]

Hey thanks, I plan on

Hey thanks, I plan on ordering this kit. Question, what is the big square opening in the forward hull in the last photo?

Thanks,

Steve

[boatbuilder1]

bow plane adjustment and access

bow plane adjustment and access plate for screw joiner

[anonymous]

How about some more pictures

How about some more pictures Sailorman?


Thanks,

steve

[jsl]

Hi Charlie,

I sent you an

Hi Charlie,

I sent you an email.

Did you recieve it?

Jacob

[boatbuilder1]

jacob noe I did not

jacob noe I did not get the email how can I help you

[jsl]

The short story is, that

The short story is, that I and two other of my fellow students at The Technical University of Denmark are preparing to do our mid-term project. All three of us are electronical engineering students with a small passion in submariens.

Our mid-term project will be based on a simple crude model consisting only of two piston tanks, batteries and a micro-computer. The university will not sponsor an entire RC submarine.

However, we would very much like our crude model to be able to fit inside a Robbe type XXI pressure-hull at a later date, so we need external and internal dimensions of the pressure hull.

Pressure hull length, inner diameter and wall thickness. Anyone able to post a few pictures of the inside of a working XXI would also be great. We need to know where everything is inside the hull.

As for our project, the goal is to have a small microprocessor and some sensors control the piston tanks. In the static case, the system should be able to keep the sub level (or any other desired angle) and to keep the sub at any depth (and make it change its depth fast and precisely).

Current goals are +/- 2 degrees of any desired angle and +/- 2 centimeters of any desired depth at up to a depth of two meters (as deep as we can verify the numbers without playing divers)

If we have time enough, we will mount some propulsion. The system should then (under the dynamic influence of the water) still be able to stabilize, change angle, keep an angle, change to or stay at a desired depth.

This means that the sub could be controlled under forward motion, even if both hydroplanes were broken, jammed, ripped of or even missing. You might say that this has already been invented and is commercially avaiable, but we have set our eyes on the long term goals (when the project is completed and installed in a type XXI in our spare time).

The force of this design would be the microcontroller. Just imagine what you could do with a long range serial transmitter, a GPS reciever mounted in the tower, a few gyros and accelerometers, a laptop with guidance software, long range ultra-sound underwater communication... A fully autonomous type XXI with a possible diving depth of up to 25 meters. (modifications on the hull and joints made where needed of course)

Other projects to be installed could be]http://www.subcommittee.com/forum/icon_smile.gif[/img]