[PSUBS-MAILIST] sub launch

[hank pronk via Personal_Submersibles]

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
412-997-2526rdolfi7 at gmail.comrwd5301@psu.edu
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