A Photo & Discussion Forum for Wharram Design Enthusiasts
I copied the engine box as boatsmith build his ( http://tiki30.blogspot.nl/) (http://tiki30.blogspot.nl/2010/10/new-engine-box-and-yamaha-99.html... ) and am very pleased with it.
I also decided to use a longtail yamaha ft 9.9 high trust with powertilt. A silent strong engine, with the ease of the powertilt so no need to open and close the motorbox every time.
The powertilt version has a bracket that is deeper than the non powertilt version. I build the motor support close to the plans, and then ( see photo) the bracket is close to the water.
it hits the wave's above 8 knots.. at higher speeds ,10+ , it feels like hitting a brake!
I lifted the motor 8 cm, now that is over.. But even on inland lakes with 5bft the prop goes out in the air...
On photo's of another tiki i saw a construction where they use 2 pieces of rope to lift and lower the engine inside a box. ( they confirmed the ropes you can see where there to raise and lower the engine)
I now think to get the same ft9.9 high trust longtail engine without the powertilt, but with the shorter bracket.
Then i must be able to lower the engine again, without the bracket hitting the water.
I am just not sure how easy or hard it wil be to get that neatly done.
Any ideas or tips?
this what de engine box looks from the top side.
The non-electric tilt 9.9 was designed to be easily tilted by hand, and it is easy. The box/table you have covering the engine is similar to what I had on my T30 15-years ago. We just removed the lid and I would reach in a tilt the motor by hand. The water pressure during forward movement will assist when underway.
Thank you budget boater, was your motor a long tail or extra long tail? Did you ever felt the need for a deeper propellor?
When i bought this boat it had a non standard motor support. it was rough but i was able to lower the motor and raise it appart from the tilt function of the motor itself. I found it dangerous for children and liked a box around it to silence the motor so i changed it..
But now i don't know if a long tail motor is deep enough. And in the plans i don't find motor specifications.
I had the Yamaha 9.9 Saildrive (25" shaft with taller gears and high thrust propeller). In a heavy seaway it would surge as the propeller got near the surface, but it never broke the surface.
I cut a hole in the side of my box/table so that I could reach the controls. My lid was removable and the box was also easily removed when needed.
25" is sold here as "extra long tail" . Now i have the same high trust version witch is great for manoeuvring in smaller water.
Thank you for this now i now what motor to get.
Kind regards Bart
One solution is to add a 5"extension to the motor.
We think that our engine support is to plan. We have a 8hp Yamaha 4 stroke with a long shaft and high thrust. We find lifting the engine is fine and the bottom of the shaft is just above the bottom of the boat so it is unlikely to catch in a grounding. If we made the mounting again we would look to see if we could get the engine a bit higher so that it would not catch the wave tops, but the problem is ensuring it can lift far enough to catch without hitting the underneath of the aft beam (we have a pod so can not move the engine box forward).
By the by: we had a problem with the carburetor this year and discovered that the european version of the carburetor is no longer manufactured, fortunately ultrasonic cleaning appears to have fixed the problem, so be wary of picking up a second hand one.