[PSUBS-MAILIST] sub launch

[James Frankland via Personal_Submersibles]

Hank\Alan.  I am keeping a close eye on how you get on with this.
Launching is still my biggest issue.  I want to be able to get my boat off
a trailer onto the beach and of course, back on.  I have some really good
bays here that I cant get into as there is no suitable slipway, but I can
get onto the sand.

My ultimate solution is a standard skip truck.  Ive measured up a normal
truck and it would work.  But its an expensive way of doing it and I don't
have anywhere to put the truck.


​

On 17 October 2016 at 11:11, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> The sub trailer I am using is a long boat trailer that had a jet ski lift
> on it.  The lift consisted of two A frames with two racks for the jet skis
> to sit on. The A frames pivoted all the way back into the water, then the
> jet skis floated into the racks.  The A frames then lifted the jet ski's up
> above the boat, then you float the boat onto the trailer.  It was like a
> double decker trailer.    Jet skis must weigh 400 lbs or so?   that means
> it can lift 800 lbs.   I would no expect to lift any more than an 800 lb
> load with the A frame when lifting the sub.  Remember  the sub is in the
> water so there is not a lot of weight there to lift an inch or two.  No
> need for counter weight because the load is not extending far beyond the
> end of the trailer and the trailer is about 28 feet long.
> Alan might be onto a better idea though, a simple manual  beavertail to
> deflect the sub onto a roller may be simpler idea.
> Hank
>
>
> On Sunday, October 16, 2016 10:01 PM, River Dolfi via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Lifting a sub of even modest weight off of a trailer using a rotating A
> frame will require a rather large counter weight on the tongue. I wouldn't
> trust the hitch alone to hold back that much torque in the wrong direction.
> I think a simpler solution would be to just attach large wheels to the sub
> ala Simon Lake's Argonaut. Then any standard twin axle car trailer with a
> winch would work for sub duty. This would probably be a good system for
> someone who owns multiple subs. No need to build (or register and insure) a
> custom trailer for every sub you build. Three large wheels on the sub could
> be locked for transport easier than dozens of rollers. You would still have
> trouble with launches from gently sloping,shallow, muddy shores though
> since the wheels might bog down. You'd have a hard time launching a sub
> using any method in those conditions though.
>
>
> --
> -River J. Dolfi
>
> 412-997-2526
> rdolfi7 at gmail.com
> rwd5301 at psu.edu
>
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