[PSUBS-MAILIST] launch rollers

Thu Jul 24 12:48:34 EDT 2014

Hi Hank\All,

Have a look at this pic.  This is my idea for lowering the sub off the
trailer.

Two 2.5m pivoting ramps that attach to the back of the trailer and are
connected together at the end with a bar.
Two legs to support the back of the trailer.
Two 3000kg jacks, one each side.

Sub could be rolled onto the "extension" and then lowered down using the
jacks.  Sub is then wheeled off\on using a 3000kg winch.

The drawing is to scale and shows an angle of 11 degrees.

What do you think?  Its open to suggestions of course.

Many thanks
James

On 22 July 2014 14:41, James Frankland <jamesf at guernseysubmarine.com> wrote:

> Hi Hank.
> I like it.  Sounds like a potentially good idea.  I'll give it a bit of
> thought and draw a few things up.  Any suggestions\ideas from anyone
> welcome.
>
> Thanks
> James
>
>
> On 22 July 2014 14:02, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi James,
>> Right I remember you asking about that now.  The problem with jacking up
>> the front of the trailer is, if you disconnect from the tow vehicle, you
>> got no way to hold her back properly.
>> My idea with the tilting C channel is to make the channels like a tilting
>> deck.  The sub rolls back a bit and the balance point lets the C channels
>> tip creating a tilting deck so to speak. Your ramps can extend from the C
>> channels creating a long smooth ramp.  You would need a way to hold the
>> tilting C channels from dropping out of control when the sub is completely
>> off the trailer.
>> You can possibly hinge the C channels right behind the rear axel cross
>> member thus making it very clean and compact.
>> This can all be accomplished the same way that a gravity tilt deck
>> trailer works.
>> Hank
>>
>>
>>   On Tuesday, July 22, 2014 8:48:09 AM, James Frankland via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi Hank,
>>
>> I was aware of the tilting issue.  The plan is to have reasonably long
>> ramps to minimise the tilt and also jack up the front of the trailer to
>> meet the angle.  That was why I was asking about hydraulic rams etc a week
>> or so ago.  In the end I think you suggested just jockey wheels which is
>> what im going to go for.   Well, that the idea but is always open to
>> suggestions.  Can you clarify your c channel tilting idea?
>> Im not sure what you mean.  Might be better?
>> ps: The ramps are going to be c channel anyway to stop the boat sliding
>> off sideways.
>>
>>
>>
>>
>>
>> On 22 July 2014 13:08, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Hi James,
>> I am worried about your set up with the rollers.  If I understand it, you
>> will have a horizontal trailer deck with ramps on an angle to the ground.
>> With that many rollers it will be dangerous to transition from the
>> horizontal deck to the angled ramps.  When the sub rolls back, eventually
>> it will be at the balance point and tilt to match the ramp angle.  At the
>> point the sub will be on only two rollers.  If the two rollers happen to be
>> at the transition point where the deck meets the ramps, the sub will turn
>> violently and I mean violently.  It could be dangerous.  There are a
>> few solutions, you can make a tilting track with C channel that tilts with
>> the sub so all the wheels are in contact all the time.  Another solution is
>> to use only four wheels, or best of all a tilt deck trailer.  I went with
>> four large wheels on my cart for these reasons. With four wheels the sub is
>> never at a tipping point.
>> Hank
>>
>>
>>   On Tuesday, July 22, 2014 5:34:36 AM, James Frankland via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi Hank,
>>
>> Yes, the idea is to make ramps that the sub can be winched down off the
>> trailer.
>> Regards
>> James
>>
>>
>> On 22 July 2014 02:48, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> James,
>> Love the rollers, they look real good.  Are you going to have a tilting
>> track that the rollers run in?
>> Hank
>>
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