[PSUBS-MAILIST] launch rollers

[hank pronk via Personal_Submersibles]

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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