I would get a 3/8 plate of aluminum about 8" x 12", I suppose you could use plastic sheet or wood also but it would need to be thicker. Then cut an oval hole in the middle for the mirage drive. Then build some blocks to locate the 1/2" pins for the mirage (1/2x1/2x1.25" 4req). Then fashion 2 straps 1/4"x1"x2" with one thru hole and one slotted hole ( to hold the drive down) . You would of course have to work out the heights of everything so the front and back of the drive sits on the plate. Next you have to make the brackets that mount to the rear cross bar. I would use U- channel aluminum then strap both of those to to the cross bar with U bolts. You would drill two 1/4 or 3/8 cross holes into each bracket over and under (about 1 1/2 inch apart) these at for the clevis pins that mount the bracket to the boat. Next the four side bars need to be made from 1/4" x1" (x length TBD). The front bars need to swing down so they are close to vertical (I'm guessing about 20 degrees from vertical, fit to the lower holes in the brackets mounted to the cross bar via the clevis pins). Next the rear bars, these are 1/4"x1" aluminum length TBD they need to bottom out and hit the lower bars so the plate is level just above the water line with the boat loaded and passengers in their pedaling position (all TBD). The purpose of the whole setup is to pedal the cat thru the harbor, or pedal the cat thru flat water if the wind dies (happens a lot here in the keys and SW florida). When sailing you just swing it up out of the way of course. Once in the down position the mirage is held centered by two spectra strings mounted to the rear rudder gudgeons at some convenient attachment point (I would use clips). These two spectra strings are the main structural members that hold the mirage drive centered in the down position. If not steady enough two additional spectra would need to be added from the bottom of the bracket (near the front of the bracket) to the rear pylons (like at a 45 deg angle) to keep the mirage centered, when the bracket is swung up these become loose). The spectra string is what holds everything rigid and in place (like a truss would work (same way airplane engines are held in place)). Actually there is almost no structural load on the brackets attached to the rear main cross bar, instead if U bolts you could attach those brackets to the rear cross bar with Velcro or such straps if desired (so the shoe works can be removed in 30 seconds). You can always just fashion a bungy to hold the mirage bracket in the up position (kind of like the way we park the mirage drives now (the whole contraption is maybe ten to 12 lbs including the mirage drive). Now you have the mirage mounted how do you use it. There are four ways to use it. 1. Take the mirage back out, place it back in your TI where it belongs and go out in that instead (why are you taking your h16 out in no wind LOL) humor..... 2. You might be able to sit backwards on the rear cross bar and pedal from there (not likely). 3. You can run two spectra strings to the front of the boat from the tops of the pedals and operate from a second set of pedals at the front of the boat, you would have to make a long tiller extension if solo (a spectra loop going up around the front pylons that you slide back and forth to steer from the front while pedaling), shouldn't interfere with normal tiller operation. 4. You could fashion a hammock to sit on (kind of like a HAKA) that sits across the way back of the boat so you can pedal from back there (you would need to run some more spectra so you can operate the rudders from back there). 5. Take the mirage back out and put it back in the TI where it belong, then get yor evolve out and place it into the mount instead, now your all set. Ain't nobody is going to do this, think about it, if there is not going to be any wind that day nobody with a cat is going to go thru all the work of rigging their cat and going out in the first place, they just wait for a better day. I've been out in sarasota bay plenty of times with all the sail boats and cats sitting in irons with no wind at all, that has to be a royal pain to get back in so most learn quickly, on most low wind days I'm the only sail boat out there blasting along at 8-10 mph pedaling my little heart out having a blast making my own wind with my wind machine(lol). I have to be out there anyway so I might as well make the best of it, wind or no wind it just doesn't matter to me (9 times out of 10 when I go out in the summer (10 months a year) there is no wind).
Of course it would be 20 times easier to just mount a torqeedo 403 motor on an h16 with a ball mount. Just tie the two spectra strings to the lower shaft and mount to the rudder gudgeons via clips. The spectra string takes all the load so your ball mount doesn't need to be substantial (could be held on via a Velcro strap to the rear cross bar. Just swing it up when not using. The whole works including battery would be about 15 lbs. (way cheaper and lighter than a cheeta mount and outboard). Bob
EDIT: Of course if money is no object I would mount two Torqeedo 403's one on each hull either in the front or the back of the boat on ball mounts. To use them you just swing them down. You can leave your rudders up and just steer with thrust, you could literally turn 360 degrees in a 16 ft space (just like cruise ships isopods). With two motors you could probably get to pretty good speeds, and pretty good range (with two props in the water the energy consumed to propel the boat to a given speed is about 1.25 times the energy consumed with a single motor (it's not double, you would think it 2X but it's not (based on my experience on my hybrid twin engine setup). Where the calculation go wrong is if you assume "double motors = double speed" you will be sadly disappointed. However the single Torqeedo 403 is too small for an H16, so dual motors would be the preferred setup. ( Actually if I had an H16 or a getaway, this is the exact setup I would have. Just take the motors off to race (only thing left is two ball mounts with the motors removed)), 30 lbs weight for the whole works, and a few hrs runtime at fairly decent speed.
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