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        Discussion Pr.705 Lira in 1/200

#1 Cuddles Apr 04, 2011 06:18 PM

Pr.705 Lira in 1/200
 
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Hello lads,

I've always liked the idea of a small zippy Alfa so...here it is:D

#2 asd9000 Apr 04, 2011 06:43 PM

Amazing work! is that an xcelorin motor too?

#3 Cuddles Apr 04, 2011 06:56 PM

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That's all a scratch built: a foam cylinder with a hardwood dowel in the middle turned on a wood lathe with sail built with depron. All glassed and sanded.
Motor is a Graupner Inline 220 (5250kv) mounted with a heat sink.
Wtc dimension is 19cmx4cm, quite small indeed!

#4 redboat219 Apr 05, 2011 04:00 AM

Hello cuddles,
Great little project you got going there. When I first read the title I thought this was about another conversion of the CNModels Alfa. Then I saw the caption "lost foam" under the first photo. Wish you started the post with how you made the hull.

Anyway, Can you post more images of the hull.

I'm a bit curious why you chose to build in 1/200 scale and not something bigger like 1/144? Would make fabricating the stern linkages easier.

I'll be keeping my eyes on this thread.

#5 Cuddles Apr 05, 2011 01:50 PM

Well redboat, I was looking for Cn Alfa but, since was not avail....

The fact is that, although I know that a larger sub both runs better and is easier to make, I love dealing with problems related to miniaturize things.
By the way this sub is going to see lots of action because it will be my lunch time sub as there is a suitable basin near my workplace.

You can see some photos of an Alfa hull being built here:
http://s181686668.onlinehome.us/phpB...396&hilit=alfa
All is very similar except that I've used a wood lathe.

#6 Cuddles Apr 08, 2011 02:16 PM

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Hi lads,

I've some hull photos and a question.
I'm thinking to go easy and operate just the lower rudder. If so, should I make it all moving?
Stilla lot of work to do...:eek::popcorn:

#7 Brooks Apr 08, 2011 03:55 PM

Very nice, following your build with great interest.

#8 redboat219 Apr 09, 2011 03:29 AM

Yes you can get away with just using the lower rudder. If turning is sluggish you can extend the rudder using clear plastic sheet or fabricate a whole new larger rudder using clear plastic sheet just paint in the original rudder area to maintain scale appearance. The clear plastic will be practically invisible once it's in the water.

#9 Cuddles Apr 11, 2011 05:55 PM

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Hi lads,

I've decided to bite the bullet and to go scale with the friggin rudder:D
Should be hard but not impossible.
But before I must fit the prop shaft bushing in its stern cone extension:popcorn:

#10 redboat219 Apr 11, 2011 08:39 PM

What material are you using for the stern planes?

Just an idea. Instead of squeezing the stern plane and rudder linkages in the narrow confines of the tiny stern cone why not just make the bow planes movable instead to control pitch.

#11 redboat219 May 31, 2011 10:40 AM

Any updates?

#12 Cuddles Jul 27, 2011 08:17 AM

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Hello lads,

finally got some inspiration and time to go ahead.
Things left to do are:
-install yokes and pushrods (half done)
-create a saddle for WTC
-install some more indexing lips
-create a micro scale prop
-scribe and open details
-balance and test.
Video of working rudder is here:
http://www.rcgroups.com/forums/showt...7#post18876298

@redboat: I'm simply using 2mm evergreen plasticard.


P.S. Got sidetracked with a RCABS Trumpeter Seawolf done as LSV-1 Kokanee:)
http://www.navsource.org/archives/08/08356.htm

#13 tsenecal Jul 27, 2011 11:25 AM

Quote:

P.S. Got sidetracked with a RCABS Trumpeter Seawolf done as LSV-1 Kokanee
does that mean that you built a 1/36 scale LSV-1? :)

#14 Cuddles Jul 28, 2011 10:39 AM

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Ok lads,

all is connected and running:)
Please, see new video:
http://www.rcgroups.com/forums/showp...95&postcount=2

Rudder and planes were tacked with cyano and faired with tamiya epoxy putty quick type.
Hull was puttied to fill some minor cracks n' dings and all the panels to be scribed are penciled.

Some tests in the bathroom showed good control response and some roll instability but not so much.

Still must scribe and open all the panels and make front planes. New indexing lips were installed but are not enough; I must devise some kind of locking system.

#15 Cuddles Jul 28, 2011 09:03 PM

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Look at my prop, I'm very proud of it!
Looks scale enought to me...:cool:

Scribing work looks a bit poor but I still have to add some details like torp doors, sonar windows, bottom and sail vents.
Tomorrow will add fwd planes and a magnet lock for hull halves.
Must find some 1,5mm i.d. silicon tube to use as a coupler and she will be ready to launch.

After a shakedown cruise I'm planning to add creeper pods, water scoops etc.


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