Originally Posted by NickDK
Yes it is my house
This is also my dream to have such a setup, but it has proven pretty hard. The rocks can't be removed as they need to be there for coastal protection, so the ramps would have to be on top and they would be long. Each section about 6m, a scaffold plank in this length will be very heavy. Also there's not room to maneuver at the beach, if the boat is 250kg with engine then it will probably be hard to launch and turn with a pair of launch wheels?
Honestly, I think most of us would give our right arm for water access a few yards from our house like that.
Mankind has a history of amazing, seemingly impossible engineering projects around the world - I can't believe that a couple of blokes, a morning of head scratching and a visit to the builder's yard wouldn't find a ramped solution that is workable over a few yards of rocks...!
I'd clear the rocks in the water/launch area (not the ones on your house boundary), stick with a hard floor SIB and use any lightweight ramp material - maybe some PVC 6" half-pipe sections that slide into each other for storage then overlap each end with a pin dropped through a hole in each to secure or similar, easy to assemble, store, use. Or some off-road waffle boards (like lightweight sand ladders), etc, etc.
Or rearrange two rows of the rocks to match the transom/dolly wheels track and minimise the gaps and infill with aggregate/concrete to smooth the path enough, does't need to be perfectly smooth - larger pneumatic wheels will roll over the smaller bumps.