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Apr 30, 2018, 03:57 PM
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Stephen Vick's Avatar
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Discussion

Bronco Type XXIII


Just got a Bronco Type XXIII U-boat. I'm in my brainstorming phase prior to this build. I'm thinking 2.5 inch WTC, either pump or snort. Not a lot of bells and whistles, just a good reliable runner.... Oh, and I will scratch build my WTC. Thoughts?
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Apr 30, 2018, 07:09 PM
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tchalfant's Avatar
I loved my Bronco Type 23, 2.5" WTC would work.
Apr 30, 2018, 07:58 PM
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Found this nice photo of a Bronco Type XXIII with a water pump based ballast system on Facebook. As you can see, starting from left to right; water gear pump , water bottle ballast tank, geared drive motor then servos for rudder and dive planes.
Last edited by redboat219; Apr 30, 2018 at 08:09 PM.
May 01, 2018, 10:19 AM
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Very nice. I would advise against that large a diameter wtc. No room for foam at the water line and little for weight below. I found that a 3" OD cylinder was stretching it.
May 01, 2018, 10:21 AM
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The big conning tower acts like a sail and needs to be counterbalanced.
May 01, 2018, 01:08 PM
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Stephen Vick's Avatar
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I love the water bottle as ballast tank! My brain is firing up now. I would imagine that the tower would act much like the Sail on a Skipjack class sub. Good stuff guys, keep it coming.
May 01, 2018, 01:34 PM
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Question on a water bottle for ballast. Where does the air go when water is being pumped in? I can see this working with a bladder, but for a solid bottle, the air inside has to be moved somewhere. Is it compressed into the WTC itself?
May 01, 2018, 07:24 PM
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As the bottle fills with water air is compressed inside the bottle.
May 01, 2018, 08:26 PM
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Ah, ok. Thanks for the info.
I'll be watching this thread as I'm looking to build a DIY WTC as well.
May 07, 2018, 11:05 AM
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A conversion kit for static RCing of a Bronco Type XXIII submarine is available here:

http://https://maximus-modellbau.de.tl/NEU-d-Typ-XXIII-1-d-35-V-.--2018.htm
May 07, 2018, 11:17 PM
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Have you seen tsenecal's 1/72 Moebius USS Sculpin thread. It has a nice water pump/ bag based ballast system https://www.rcgroups.com/forums/show...-%28Sculpin%29
May 07, 2018, 11:18 PM
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Quote:
Originally Posted by tchalfant
I loved my Bronco Type 23
Did you ever recover her?
May 08, 2018, 06:34 AM
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tchalfant's Avatar
No. It is on eternal patrol.
Jun 25, 2019, 12:40 PM
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Stephen Vick's Avatar
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Iím back to work on the XXIII, had a Type VII and Newport 12 sailboat distract me for a bit. Iím using Maximus Modellbau WTC and the Nautilus Drydocks (Dave Merriman) fittings set. I have the basic hull and tower complete. You can see the bayonet style lock for the aft section The WTC and aft section will slide into the fore section as a complete unit. The tower will be held in place by use of a locking pin and magnets.
Jun 25, 2019, 07:12 PM
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Stephen Vick's Avatar
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Coming together now. Mounts for the WTC are in the hull , linkages worked out and, access hatches cut and secured. Time for detail work. A bit of putty here, bit of wire there etc... WTC will install when finished hull is in primer.


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