Re: [PSUBS-MAILIST] Support craft

[Jim Rudholm <jimrudholm@gmail.com>]

I built a  L. F. Herreshoff launch, his Piquant design, back in the
mid '70s. The boat was 47' loa, 6'9" beam, and 2' draft. For the
highway trailer, I used 3/4ton pickup hubs (full floating) for a
tandem axle setup with 3" pipe for the axles. A heavy plexiglass cover
was made for each hub and was drilled and tapped in the center for an
1/8" NPT pipe plug drilled 1/16" for a vent. Normal 30wt oil was
filled to cover the bottom of the bearings. The hydraulic brakes were
hooked to a surge hitch.  For the first launch, solid plugs were put
in. However, the axles went to over 6' deep and water got past the
seals. The next time Schrader valves were fitted and each axle
pressurized with a hand tire pump to a little over 5psi. The Garlock
oil seals handled this pressure and kept the hubs dry. After recovery,
the vented plugs were put back.
Jim R.

On Fri, Aug 6, 2010 at 9:26 AM, glen brown <gbrown091@gmail.com> wrote:
> Hi Jens
> Clever for the time.I see once the caissons were locked in place the water
> was simply pumped out. After Vance stated that a K can only be towed at 4kts
> my bubble burst .
> Im thinking of constructing 2 water displacing pontoons with each pontoon
> having 3 airtight bulkheads ,on flooding the central compartments the
> pontoons should just be possisively bouyant, between the 2 pontoons a
> winchable cradle which once the water has been pumped by bildge pump out of
> the centre compartments can assist in lifting more of the K out of the
> water. With the right desighn one could possibly have wheels with oil filled
> hubs attached to the pontoons permanently to assist with towing out of the
> water.
> Glen
> ----- Original Message ----- From: "Jens Laland" <laland@artematrix.org>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, August 06, 2010 10:14 AM
> Subject: Re: [PSUBS-MAILIST] Support craft
>
>
>> Take a look at this old, dutch invention... called ships camel, ref
>>
>> http://www.vaartips.nl/extra/kameel.htm
>>
>> Best regards,
>> Jens Laland
>>
>>
>>
>>
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