Before you can erect the double A-frames, you need to prepare the site. Laying out the distance between A-frames and anchors Now repeat the entire process to build the second double A-frame. Lash the two bottom ledgers together where they overlap with three Strop Lashings.
To complete the double A-frame, stand it up so the butt ends of all four legs rest solidly on level ground. Also note where the tops of the A-frames are, because this is where the hand ropes will be. You can adjust the overlap of the two A-frames to adjust how high the foot rope will be off the ground. Note: The point where these two legs are lashed together is where the foot rope will rest. Then with a good tight Square Lashing, lash the two legs together. The first step in lashing the A-frames together is to go up where the two legs cross (the X formed by one leg from each A-frame). Lay one A-frame on the ground and then put another on top of it so that the bottom ledgers overlap one-half their length (approximately 3′). Remember that all three lashings on the A-frames are Square Lashings, even though the spars cross at less than 90˚ angle.ĭouble A-frame. When you have four A-frames, you can lash two of them together to form a double A-frame.
Now you can lash the four A-frames together, laying them out one at a time using the stakes.
This will also indicate how far the legs are spread apart. Then drive stakes to mark the positions of where the bottom ledger crosses the legs. Before lashing, drive three stakes, as follows, to help you make all four A-frames the same size: Drive a stake at the top to mark where the leg spars cross. Lay out the first set of three spars (two legs and one ledger) on the ground in position for lashing. The second advantage is that the positions of the A-frames can be adjusted so the span between the hand ropes can be narrowed for better balance as you make the crossing.īuilding the A-frames. The first step in building the monkey bridge is to build four A-frames using the 8′ spars for the two legs, and 6′ spars for the ledger. First, the double A-frame provides a wider base making it less likely to tip over. This new method has two distinct advantages over the X- frame version. Using a double A-frame to build a monkey bridge is a departure from the usual X-frame that supports the foot rope and hand ropes. The following instructions and guidelines are provided by Adolph Peschke, taken from the 1993 edition of the Pioneering Merit Badge Pamphlet: It’s frequently featured at Scout Expos, Camporees, Scout Camps, and is often a central attraction at public gatherings where Scouting is represented. The well-known, time-tested, traditional Monkey Bridge is perhaps the most familiar of all Scout pioneering projects. Adjusting knots and lashings after the first test crossing.
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