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Old Mar 22, 2012, 09:39 AM
RC sub dude
CaptainNemo12's Avatar
Montreal, Quebec, CANADA
Joined Nov 2004
301 Posts
Why not use the bronze props for propulsion instead of the plastic ones?
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Old Mar 26, 2012, 08:26 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 !
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Last edited by Rotorhead Dave; Mar 26, 2012 at 04:29 PM. Reason: I can't spell !?
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Old Mar 31, 2012, 09:48 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 - - -
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Old Mar 31, 2012, 09:50 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
continueing -

more bulkhead and stuffing box pix -
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Old Apr 21, 2012, 09:34 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
more stuffing box and rear shaft support bearing photos - - -
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Old Apr 21, 2012, 09:36 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
fitting stuffing boxes through the hull - - -
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Old May 13, 2012, 11:15 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
bearings, stuffing boxes, and rear support bulkhead work -
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Old May 13, 2012, 11:17 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
starting to come together now - - -
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Old Jul 06, 2012, 07:14 PM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
building the perfect bulkhead !
from cardboard mock up to completed lite-ply, with bushings installed.
a photo-essay !
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Old Oct 04, 2012, 11:07 AM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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.

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Old Oct 06, 2012, 01:10 PM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 ! ! !
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Old Oct 06, 2012, 01:14 PM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 !!
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Old Oct 09, 2012, 09:35 PM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 !
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Old Oct 11, 2012, 01:24 PM
SA-2 Samson
Midwestern US of A
Joined Sep 2010
56 Posts
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 ???
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Old Oct 11, 2012, 01:30 PM
BabyBootLegger
sunworksco's Avatar
United States, CA, Alameda
Joined Nov 2010
656 Posts
I have Alexander Engel's drawings.
Pm me your email address and its yours.
Regards,
Giovanni
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