I found a Long Shaft Outboard Motor that has a great price-to-performance ratio, but my sternplate is a little too short. I'm not sure if it will work. This might have happened to some boat owners. I think it's conceivable, but not a good idea. Long-term use will produce issues if no changes are made. Next, we'll look at the pros and cons of using a long-shaft outboard engine with a short sternplate, as well as the safest way to install it if you have to.
Understanding Shaft Length Vs Transom Height
First, let's learn about the length of the shaft and the height of the sternplate. The shaft length of a long-shaft outboard motor is 51 cm, while the shaft length of a short-shaft outboard motor is 38 cm. The propeller can only be set at the right water depth if the sternplate height and shaft length are the same. The best place to put it is with the Anti-Ventilation Plate almost level with the bottom of the hull.
What Happens If I Use A Long Shaft On A Short Transom?
A long leg outboard motor on a short sternplate suggests that the motor is too deep in the water, around 5 inches deeper than it should be. Too much propeller submersion can cause:
1. More Drag:
The submerged propeller has a larger surface area, which makes the water more resistant and slows the boat down.
2. Slower Speed And Less Efficiency:
The engine has to work harder to keep the speed up while the boat is deeper in the water, which uses more gas and lowers the top speed.
3. Problems With Handling:
If the boat engine is not in the right place, the boat will not be balanced, which will make it harder to glide, respond, and speed up.
4. Water splashing and backflow:
If the outboard boat motor is too low, water can splash up toward the stern. Water can also get into the boat when the seas are rough.
Are There Any Situations Where It's Acceptable?
1. Modest-Speed Applications:
When the boat is cruising in calm waters, fishing at modest speeds, or moving products short distances, it may be okay for it to lose performance.
2. Heavy-Loaded Vessels:
When a vessel is carrying a lot of weight or going through stormy waters, a deeper propeller helps it stay on course.
How to Use Long-Shaft Outboard Engines Safely on Short Sternplates: If you already have a long-shaft boat engine and need to use it, you can:
1. Put In A Sternplate Riser:
A sternplate riser or lift plate raises the height of the sternplate, which puts the outboard motor back in the right position, makes it work better, and keeps everyone safe. Most people think that the best and most professional way to fix this is to put in a sternplate riser.
2. Put In An Adjustable Bracket:
Some brackets let you change the height of the marine motor so that it is better aligned. Brackets, on the other hand, are only good for small changes. It won't work to attach a bracket if the difference is big.
3. Acceptable Performance Reduction:
If you know the limits, it's okay to tolerate a drop in performance when you're working with light loads and modest speeds. However, this should not be done for a long time.
Do Not:
❌ Never tilt the engine too much to make up for it.
❌ Don't ever dismiss problems with handling.
❌ Never go faster than safe operating speeds.
❌ Don't ever think that "the deeper the better."
Suggested Fix: Pick the Right Shaft Length:
Make sure to get a shaft length that fits the height of the sternplate if you haven't bought an outboard motor yet. A short-shaft outboard motor is best if the sternplate height is 38 cm. If the sternplate height is 51 cm, a long-shaft outboard motor is best. A good match makes sure that the performance, fuel efficiency, and safety are all at their best.
Conclusion
You can put a long-shaft outboard motor on a short sternplate, but this isn't usually a good idea. It can be done as a temporary fix. The best way to make sure the boat owner gets the most performance, efficiency, and safety out of their boat is to match the length of the outboard motor's shaft to the height of the stern plate. Please get in touch with KLS for more information about Yamaha Enduro 40HP:
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FAQ
Q1: Can I utilize an outboard motor with a long shaft on my short sternplate for a short time?
A1: Although short-term or transient use is feasible, performance and efficiency may be impacted.
Q2: Is it preferable to use an outboard motor with a long shaft rather than a short shaft?
A2: Not always. The most appropriate fit is the best fit. It is only superior if a long-shaft outboard motor is needed for your sternplate. Otherwise, performance could be impacted by employing a very lengthy shaft.
Q3: Will my boat be harmed by a long shaft?
A3: It won't be harmed directly. However, it can make handling more difficult and put more strain on the sternplate. It could be dangerous to operate in choppy water.
Q4: Can I alter my boat instead of changing the outboard motor if it's not appropriate?
A4: Indeed, a popular and efficient method is to install a sternplate riser or lift plate.
Q5: How can I determine whether my outboard motor is too deeply submerged?
A5: Examine the Anti-Ventilation Plate. There won't be any issues if the Anti-Ventilation Plate is flat with the boat's bottom. The shaft is too lengthy if it is much below the bottom.
References
Wikipedia Outboard Motor