Wow thank you for the input Lemondrop!
Here's the mass for the parts:
Full plywood sheet =98lbs/44kg
Pressure treated 2X4's - 16ft weight: 34 Lbs x 3 =102lbs (15,4kg) x3 = 46,2kg
Total: 200 lbs/90kg
How strong do you think a structure like this will be? Do you see it as being supported anywhere underneath?
If I compare your structure to something made in aluminium, I would with the same weight be able to handle a 2000+ lbs weight. And it would be very durable, but non folding. I would try to scale i a bit down as i think it would be quite a catch 22 starting to lift and place a 200 lbs ramp.
You're right, this is my base needs. I have started to look at small RIB's too but the challenge is similar.Based on what I've read so far I believe you are considering a sib with an air floor or possibly an aluminum or wooden floor in the neighbor hood of 12' - 14' with a 20hp 4 stroke. That's not to say you would not consider other options. Your biggest issue (aside form boat & motor selection) is getting the rig from above the rocks to the beach with the boat prepared to launch.
I'm pretty sure I understand your structure and I have calculated the weight and such a ramp isn't lightweight - I understand that it's folded but still a single bulk to move around?For you ramp, I would acquire 2 sheets of 3/4" x 8' x 4' outdoor plywood. 3 16' pressure treated 2 x 4's, a 4' steel hinge. Cut the 2 x 4's in half and mount them on the side opposite the hinge on each side and down the middle. That way when the ramp is unfolded, the 2 x 4's provide strength and support. The ramp can then be folded and stored when not in use. That will give you a 16' run to the beach.
Here's the mass for the parts:
Full plywood sheet =98lbs/44kg
Pressure treated 2X4's - 16ft weight: 34 Lbs x 3 =102lbs (15,4kg) x3 = 46,2kg
Total: 200 lbs/90kg
How strong do you think a structure like this will be? Do you see it as being supported anywhere underneath?
Winch sounds good!I would then acquire a winch like those commonly used to retrieve boats onto a trailer and use that to get the rig down to and back up from the beach. This of course assumes you have launch wheels mounted on the transom. I am comfortable the BeachMaster wheels will suffice in getting the fully rigged outfit (as described above up & down to the beach).
Great info on the launching wheels. I would prefer not to have to remove them so good to hear you don't see any degrading from keeping them attached.Moving the rig around can be problematic with my shoulders. I typically load everything in the rear of the boat and move it around to balance out the boat once in the water (makes it easier to lift the bow).
With regards to removing the launching wheels...... If installed properly on the transom, they will be above the water line when on plane. Removing them is not that easy to do on the water as they have four latches in fairly precise locations. It's hard to get at the latches when the wheels are not extended. Once you release the latches (remember the wheels are extended), the wheels are bouyant enough that it is very difficult to release the other latches. I have noticed no degradation in performance with wheels on or improved performance with wheels off. Loaded as, stated in previous posts, I consistently can get 28 mph WOT if I choose too (GPS). Normally run it anywhere from 1/3 to 1/2 throttle around achieving around 18 mph.
Probably other solutions to consider, but, this is how I would approach the issue.
If I compare your structure to something made in aluminium, I would with the same weight be able to handle a 2000+ lbs weight. And it would be very durable, but non folding. I would try to scale i a bit down as i think it would be quite a catch 22 starting to lift and place a 200 lbs ramp.