1:32 scale Type 9 U-Boat build (WHU short kit ) - Page 4 - RC Groups
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Mar 22, 2012, 10:39 AM
RC sub dude
CaptainNemo12's Avatar
Why not use the bronze props for propulsion instead of the plastic ones?
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Mar 26, 2012, 09:26 AM
SA-2 Samson
Pitch and diameter of the scale ( bronze ) props are small enough that I don't think they will have enough "ooph" to push an 8 foot 70 pound model - i think they would just cavitate wildy !
Last edited by Rotorhead Dave; Mar 26, 2012 at 05:29 PM. Reason: I can't spell !?
Mar 31, 2012, 10:48 AM
SA-2 Samson

more pix ! stuffing boxes and bulkhead work


i am back !
here are photos showing the home-made stuffing boxes,
as well as the early stages of mock-up for bulkhead,
to support bearings for forward ends of prop shafts - - -
Mar 31, 2012, 10:50 AM
SA-2 Samson

continueing -


more bulkhead and stuffing box pix -
Apr 21, 2012, 10:34 AM
SA-2 Samson
more stuffing box and rear shaft support bearing photos - - -
Apr 21, 2012, 10:36 AM
SA-2 Samson
fitting stuffing boxes through the hull - - -
May 13, 2012, 12:15 PM
SA-2 Samson
bearings, stuffing boxes, and rear support bulkhead work -
May 13, 2012, 12:17 PM
SA-2 Samson
starting to come together now - - -
Jul 06, 2012, 08:14 PM
SA-2 Samson
building the perfect bulkhead !
from cardboard mock up to completed lite-ply, with bushings installed.
a photo-essay !
Oct 04, 2012, 12:07 PM
SA-2 Samson

It's Rudder Time !


Yep - time to tackle those annoying twin rudders, with rudder posts so close to the hull you can not use typical tie-rod style linkages.

So, this was the arrangement I came up with.

The pivot post is cast-in-place in a lump of epoxy resin, which was poured into a taped in place thin cardstock mold. Cardstock and tape removed after expoxy had set up. Pivot shaft goes all the way down to the hull bottom itself, and I drilled a hole half way thru the hull, which the pivot shaft is screwed into.

Oct 06, 2012, 02:10 PM
SA-2 Samson

boat stand time !


the darn hull keeps rolling around when I am trying to work on it,
so I decided it is time to buckle down and build a decent boat stand,
sturdy enough for the shop, but pretty enough for the Mantle !


of course the hard part was cutting the cardboard patterns so that they
fit the compound curves of the hull ! several hours of snipping away
with the little curved scissors, striving for perfection ! ! !
Oct 06, 2012, 02:14 PM
SA-2 Samson
Then it was time to trace the templates onto some nice white pine
1 by 10 plank turned out to be a perfect size !

cutting was done with the faithful scroll saw,
followed by some fun with the power sanders.

then some drilling and countersinking and screws followed.

and lastly, stain and varnish ! Turned out well, me thinks !!
Oct 09, 2012, 10:35 PM
SA-2 Samson
Finally satisfied that there is enough varnish on the boat stand !

so, here you can see I have added sticky-back felt to each of the 'pressure-points', where the weight of the sub rests on the stand.

and then two shots showing the stand and sub mated together !
Oct 11, 2012, 02:24 PM
SA-2 Samson

now, back to building Das Boot !


so now I have decided it is time to tackle the dreaded prop shaft struts,
as well as the 'anti-fouling' doodles that go from the thrust bearing, around the prop, and end at the dive plane pivots.
I am convinced these were designed to keep cables and netting and such from fouling the props or stern planes.
Photo shows the parts mocked up in cardstock, to determine size, length, and the location of hull access points.

I chose some .064 thick brass strip and plate - strip for the struts, plate for the anti fouling gizmos.
One strut will enter the hull through a slot and get fiberglassed to the inside.
Or maybe I better 'glass in a bracket, and bolt the strut to said bracket ?
other strut will attach to the keel with a teeny tiny bolt, nut, washer.

Both struts and the antifouler must Solder to the brass tube that holds the thrust bearings, just in front of the prop.

I am not looking forward to soldering FOUR seperate bits of brass to each other, let me tell you !
maybe I should build a wooden Jig to hold all four parts in alignment whilst heat and solder are applied ???
Oct 11, 2012, 02:30 PM
BabyBootLegger
sunworksco's Avatar
I have Alexander Engel's drawings.
Pm me your email address and its yours.
Regards,
Giovanni


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