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The First Outboard Motor Bracket for Catamarans
Installation Instructions

 

ASSEMBLY OF BRACKET TO THE HOBIE 14/16/17/20/21, Wave and ALL PRINDLES

The bracket you received comes fully assembled and is ready for mounting to the rear cross bar of your catamaran.,

Before attaching the bracket to the rear cross bar of your catamaran, make sure your trampoline is level at the rear of the tramp.   Some catamarans, like the Hobie 14 and 16 trampolines go up slightly near the mast, so do not use that as a reference. The process of mounting the bracket can be much easier if done with 2 people as I will describe. 

Take the bracket and place the flanges or curved part against the rear cross bar. The bracket should also be in the middle of the rear cross bar. For most cats finding the middle of the rear cross bar is easy because the cleat ring for which the traveler rope attaches will fit between the castings.

While the tubular motor arm is in the motoring (down) position, rotate the castings so that the arm is level or on the same plane as the rear of the trampoline. Sometimes it may be worth the exercise of putting the boat in the water, have the owner sit on the tramp to simulate the correct weight and then have the 2nd person rotate the castings with the motor you intend to use be clamped on the bracket making sure the water line is half way up the shaft of the motor. 99% of the time it turns out after doing this exercise the tubular motor arm is level when the trampoline is level. But sometimes, there may be a boat owner weighing considerably more and you will have to compensate for this weight by rotating the bracket slightly higher than level. If you are in that category, go through this exercise and do it right. Enough said. When you are satisfied that the bracket is in the correct location, find some way to clamp it in that position. Before marking any holes, bring the rudders to the trailering position or beached position making sure the castings do not interfere with the tiller. The tiller of the Hobies should rest in the curve of the castings. For the Prindle owners this does not apply.

Mark and drill one hole on each side of each casting and place the rivet in the holes to hold the bracket in place. Recheck your measurements, because if you have made a mistake, you still have the other holes you have not drilled to correct yourself.

When you are sure all holes are properly drilled and while rivets are still just placed in holes, check one last time that the arm is in the correct position. Ok, go ahead and pop off the rivets, but be very careful to keep you fingers out from in between the handle of the gun. When the rivet pops, it can be very painful if your finger is in there. Also, it has been my experience that it takes 3½ squeezes to pop the rivet. Unfortunately, it is almost impossible to squeeze the handle of the pop rivet gun when the handles are fully out and it is much easier to take half bites, because then you can get your fingers around the handle and get maximum pressure to the gun. Bottom line, it takes a lot of pressure to pop a stainless steel pop rivet. And how strong are these pop rivets? Well just one pop rivet will hold over 1000 pounds in shear, so you don’t have to worry if these 6 rivets will hold the bracket securely on the rear cross bar. And why rivets and not sheet metal screws? Let’s see a thief unscrew a rivet.

 Any questions, email me at rebokrfl34@gmail.com

Bracket Installation For Hobie Getaway

The installation of the Cheata Motor bracket for the Hobie Getaway is similar to the Hobie 18. The bracket looks like the Hobie 18. There is the main casting underneath the rear cross bar and a small casting on top of the rear cross bar for the 3½” X ¼” bolt to go through.

The difference with the Getaway is the elliptical rear cross bar is turned around so that wide part is facing forward rather than like the Hobie 18 or 16. The trampoline is laced from tads in the rear to a ¼” nylon rod running the full width of the trampoline.

You need to unlace the rear center of the Getaway trampoline allowing the trampoline to be loose in the center so that you have room to install the bracket. 

The main casting goes under the Getaway just like the Hobie 18 and it should follow the curvature of the rear cross bar. 

Please go to the photo section and go to page 3. There is a cross section of the rear cross bar that shows how the bracket should be installed and there are measurements shown IN RED. Please note the small rib inside the the extruded aluminum. The ¼" bolts should go to the inside or forward of the rib and the rivets should go to the outside or toward the rear of the rib. 

The ¼” bolts will go parallel to the each other when bolting the bracket. The small castings should be placed next to the cam block, but this is only a guide to get you close. You’ll have to either clamp the bracket or hold it, then sight the bolts to better judge where the small castings should be positioned.  The ¼” hole will be approximately 1½" from the rear of the rear cross bar as shown in the cross section photo.

I am now giving a measurement of the distance between the 2 small castings. It usually measures approximately 2½".  Measure the 2½" from a centerline thus making it 1¼" to the left and 1¼" to the right. that way you should be able to keep the ¼" bolts parallel.

One other item I need to mention. When the Getaway was first constructed there was not the stainless steel plate under the rear cross bar.  In the last few years, it has come to my attention that this stainless steel plate now exist.  You can if you wish install the bracket over the plate and even though it will not lay flush, it will work.  Others may want the castings to lay flush and may take the time (approximately 30 minutes) to grind the front of the castings so the bracket will lay flat. (see the 4 photos in the photo section of the Getaway)

I have entered 5 new photos in the photo section showing a cross section of the Getaway and where the rivet should go.  These photos do not show the small casting on top, but does show the angle of the bolt going through the rear cross bar and the position of the rivet. 
 I would position the rivet in front of the rib between the top of the rear cross bar and the bottom (Please see photos).   The measurement of the rivet hole would be ½" from the end of the rear crossbar.  I have had 2 or 3 customers call and say that the rivets pulled out and this is probably because they drilled too close to the rib connecting the top and bottom of the cross bar. If that happens, then 2 large SS sheet metal screws will solve the problem without having to redrill.

The last photo shows approximate measurements from the end of the rear cross bar to the center of the rivet hole and the center of the ¼" bolt. These measurements are stated approximate, but are very close to exact.

WHEN YOU DRILL THE ¼” HOLE, ONLY DRILL THE BOTTOM HOLE FROM THE BOTTOM AND THE TOP HOLE FROM TOP. DO NOT ATTEMPT TO DRILL ALL THE WAY THROUGH FROM EITHER THE BOTTOM OR THE TOP. Once these holes have been located, the bracket can be bolted to the rear cross bar. ONLY MAKE THE BOLTS SNUG,
DO NOT OVER TIGHTEN THESE BOLTS, JUST SNUG
. Now you can drill the 3/16” drill hole for the rivet.  The rivets are what carry most of the weight of the motor. Each rivet has a sheer strength of 1000 pounds.  The pop rivets are EXTREMELY DIFFICULT to pop off with the common pop rivet gun.  I own a Stanley pop rivet gun and have found if you get 2 pipes and slide them over the handles you can make the handles as long as you want and have more leverage.

Now you are ready to re-lace the trampoline back if you are assembling to the Getaway. The ¼” rod will have to go over the motor bracket and not be flush with the rear cross bar as it was before, but that should be OK.

Any questions after reading this, please call or email to discuss this before drilling any holes. I will do everything I can to help make this clear.

Any questions, email me at rebokrfl34@gmail.com

Bracket Installation For Hobie 18

The Hobie 18 is similar to the Getaway install except the casting actually follows the cuvature of the rear cross bar and can only go one way. There is the main casting underneath the rear cross bar and a small casting on top of the rear cross bar for the 3½” X ¼” bolt to go through. Like the Getaway, only drill the bottom of the rear cross bar from the bottom and the top of the rear cross bar from the top. DO NOT ATTEMPT TO DRILL ALL THE WAY THROUGH FROM THE BOTTOM  OR FROM THE TOP. You can if you wish clean up the holes all the way through once you have drilled the holes from the bottom and from the top.  The ¼” bolts can now be installed. ONLY MAKE THE BOLTS SNUG. 
DO NOT OVER TIGHTEN THESE BOLTS, JUST SNUG


Now you can drill the 3/16” drill hole for the rivet. (SEE ABOVE PARAGRAPH) The rivet is what carries most of the weight of the motor. Each rivet has a sheer strength of 1000 pounds.  The pop rivets are EXTREMELY DIFFICULT to pop off with the common pop rivet gun.  I own a Stanley pop rivet gun and have found if you get 2 pipes and slide them over the handles you can make the handles as long as you want and have more leverage.






Any questions, email me at 
rebokrfl34@gmail.com


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