[PSUBS-MAILIST] launch rollers

Tue Jul 22 09:41:13 EDT 2014

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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