CB italian midget sub : lining up the hull halves

[raalst]

the glass on the first

the glass on the first side is pretty well removed again.



the other side had a problem as well. the glass did not follow the
contour between hull and keel. so I sanded it away.



luckily this is just to protect the
plug, it sure gives me some experience...

I think I will first cover the plug with urethane varnish before glassing
where it is bare, because I think the resin was sucked into the
gypsum just too fast, making for a poor bond between plug and
resin shell.

I got some considerable assistance from the italian Betasom forum,
where a lot of pictures of the CB in Trieste were posted just for me.
It's fun to communicatie using babelfish.
however, I fear that there was a lot of inexpert restructuring done to this vessel, because there are a lot of details visible that are different from the
historic pictures.

have a look at this CB at

http://www.betasom.it/forum/index.php?showtopic=16591&st=0&gopid=144116&#entry144116

[Guest]

Now that is what I

Now that is what I call reference photos!

Regarding absorbtion of resin, I've never had any problem, but a slap of varnish probably won't do any harm.

Andy

[geo_sim]

cb-italian midget

Hello to you all!
I have a lot of docs, pictures plans etc regarding Cb-s , as some of them where cedded to Romanian Navy during WW2.If someone interested we can keep in touch
Best regards
George-Romania

[geo_sim]

Raalst....i have seen the plans

Raalst....i have seen the plans you post here, the sections, but there are some difference between yours and mine.The most concludent are at the balast tanks!if you want to, i will scan mine and send it to you

[raalst]

geo-sim,

that would be

geo-sim,

that would be very nice !

I have found a few errors in the plans myself too.
the dive planes are not correct (should be smaller, with an extra hole
in it) also, the rudder does not continue to the keel but stops
a bit before.

For completeness, I use the ANB plans

http://www.anb-online.org/page_info.php?cPath=2001_1027&products_id=943

thanks you for your assistance.
I need photo's of the deck and the tower structure in front of
the periscope. If you have photo's I would be very grateful.

[geo_sim]

The pictures i have (about

The pictures i have (about 23) are showing the submarine during service under Romanian's Navy flag, I also have a lot of info about the internal arrangements af them.I will scan the sections and send it to you as soon as possible.
Best regards

[raalst]

Thank you, geo-sim !

please

Thank you, geo-sim !

please note I will build an operational sub. the inside will
contain lot's of electronics, etc.
therefore, pictures of the inside are very nice, but not needed for the
building.
for the building I need pictures of the outside of the boat

do you need my e-mail address ?

[geo_sim]

Hello raalst!
Please send me your

Hello raalst!
Please send me your e-mail adress so i can give you some pictures.But i must inform you that the qualityof the pictures is not the best.
Best regards
George

[raalst]

All help is very much

All help is very much appreciated, George !

my address is raalst (AT) bart (DOT) nl


I also got into contact with the Zagreb museum,
and I am planning a visit now.
I had to know for sure the boat was still there
before buying the tickets

btw, youtube rocks !
bit of film of the CB type subs in Malta. check this video and
fast forward to 8:55

http://www.youtube.com/watch?v=AfD1DNAKDYg

[raalst]

waiting for the visit to

waiting for the visit to Zagreb....(sigh).
meanwhile I learn the sand/plaster chore.

this is what I will be crawling over in the museum
(note the steps! tempting...) :

[raalst]

....aaaaand back again.

well, those

....aaaaand back again.

well, those ANB plans leave a bit to be desired, when comparing them to
this real CB-20.

this is the inside :

[raalst]

some photo's I made of

some photo's I made of CB 20 in Zagreb technical museum






















people who want to scratch build this boat too can contact me for more details.

[geo_sim]

cb

Hello raalst
Nice pictures...but after viewing them i begin to think that i am right with what i have told you: the plans that you have from Anb must be corrected.But please notice something...durring the war, some of this little subs suffered some minor modifications.One of them is increasing the depth control planes and the other is at the tower.

[raalst]

Hi george !

yes, I

Hi george !

yes, I think so too.

the tail is not correct in the ANB plans. too small.

and there are several small things that are not correct in the ANB plans.

the tower : the ANB plans show the front is higher than the back side.
But this is not the case with the boat in Zagreb.

the yougoslav army added the buoy. they cut off a part of the
periscope housing to make room for it.

[Guest]

Were all the craft built

Were all the craft built to the same specification though?

I'm thinking of other Midget boats here i.e. Seehund, where there were a lot of inconsistencies in the design which led to one boat being different from the next.

I suppose it depends how particular you are about scale fidelity. Most folk at the pondside are unlikely to know the difference, and you've probably got a unique model here- I haven't seen another, well not one this size that works.

Andy