GLR444
31.05.2021 11:33:47
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If you went too long it would still work but it may lack in performance. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. If you go too short your more than likely going to cavitate and loose power.
If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct.
Cavitation could be caused by badly placed transducer or through hull fitting. A hollow in the hull (also called a hook in the hull), worn/bent Propeller. From initial start – to get onto the plane, the engine seems to rev a lot but the boat stuggles to get up on the plane, you could have cavitation ventilation issues. more
My experience with 25″ engines on jackplates on a 20″ transom has been fine. It seems like a benefit to have the engine parts up 5″ higher from the water, and I like jackplates (have them on both boats). [links]
An outboard that is mounted too low will limit your boat’s optimal operation. You can often tell that an outboard is too low if you are experiencing sluggish speeds, poor handling, excessive spray, porpoising, or even water pushing up into the cowling. here
The shaft length you’ll need to keep the motor head submerged at the appropriate depth is at least 35 inches. If you frequently fish or boat in rough waters, you may even want your motor a little bit deeper.
Remember the bracket is looking down and for some reason, the engine right now is sitting a little too low in the water already.. I dont know what to do. I think I installed my bracket a little too high, but then again the cavitation plate is only 1 1/4" above the bottom.
Please help, my problem may have a very simple solution but I just dont know what to do anymore so I need help. I think the problem am having are all symptoms of the outboard being too high?
The cavitation plate is now 1 1/4 inch above the bottom of the hull. I took the boat out for the first time 2 weeks ago and it was getting on plane very nice and fast, but once on plane about 27-30 MPH it would start to bounce (very smoothly and soft) on the bow. It was ok on the begining, but then it would start to kind of catch a reithem and bounce a little more and more till it was not ok anymore. So I trimmed the motor down and it solved that problem, but the motor was trimmed all the way down for the boat not to do this. more
So I whent and put a pair of lenco trim tabs, so I woulnt have to trim it with the engine anymore. But THis has to be a problem that can be fixed. I whent out yesterday and the sea was as flat as it can be, like a lake. And with the trim tabs it was riding nice, but when I would stop using the trim tabs it would ride even better, lighter and faster until it would start little by little catching that little bounce again until you have to bring down the tabs. This was at speeds of 24 to 30MPH so its not like am going really fast. [links]
I got a 224 CC (the one I sold, I bought it back) and installed a 30" setback full platform. The platform was not meant to be for this transom as it has only 6 degrees and my transom has 13 degrees so its kind of looking down a little. The engine is also a little heavy for the boat, 250HP Yamaha saltwater. Anyways, here
SO MY QUESTION IS: Do I have to lower the outboard even more or bring it higher?
For every inch of change in prop diameter the RPM varies by about 500 RPMs (up or down) and every inch of pitch changes the RPM by approximately 150 to 200 RPM. Therefore, the change is approximately 70% of single props: 280-350 RPMs or 105-140 RPMs respectively per prop. [links]
If your boat has a Transom Height 15″-16″ you will need short shaft and if it is 20″-21″ you will require long shaft engine. Small inflatables and dinghies tend to require ‘short shaft’ engines whilst larger boats usually require long or in some cases special ultra long shaft versions. more
A lower-pitch prop is like low gear in a car or a bicycle—you’ll accelerate quickly but top speed will suffer. A prop with too much pitch may deliver more top speed because the prop moves further forward with each rotation, but acceleration may be poor and the boat will struggle to get on plane.
A 3 blade propeller usually offers top speed performance while a 4 blade propeller provides maximum thrust and smooth cruising operation. Four blades have some features of their own, though. They often provide more lift at the stern which will help accelerate the hull, especially if it is stern heavy.
The transom is the rearmost vertical structure on the boat. Most modern fibreglass boats have a transom capable of holding one or two engines, outboard or inboard motors.
So after 1 year, I have finally completed my mini tritoon enough and mounted a ’78 35hp Johnson on it (through-hub exhaust). I was able to take it out for a spin earlier today and had some issues.
Second, there was a lot of water splashing up into the boat and initially all over the motor (even going up over the top of the cowel!). I will have to fool around with load on the vessel, since with me and 1 passenger, most of the weight is near the back of the boat right now (battery, gas, etc.)
First, the motor ventilates with anything much above 2/3’s throttle, and has prop slippage. I mounted the motor so the ventilation plate is in line with the bottom of the middle pontoon.