Yes that was what I was thinking. With the Honda 4 stroke engines they have max torque around 2500rpm and max out around 3000rpm anyway, so probably won’t need any reduction, the only thing I thought would a centrifugal clutch be required? I would imagine idle would be around 1000rpm! Pushing straight from start up.
If you do right angle gear. Better do not do it 1:1.
use 1:1.x.
Why is that? To much stress on gear to shaft?
In any kind of gear, you should avoid that z2 is some integer multiple of z1. Like this you avoid that that the same teeth are always in contact. Avoides wear.
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I was also thinking about transmission when I thought about putting e-motor inside board.
My option was also timing belt trough mast.
Another one is gears from angle grinder but with 3 or 4 gears aligned in a way that axis of bigger gear(s) is perpendicular to mast sides.
Repurposing brush cutter and its engine, like a Honda GX50, gives you centrifugal clutch and all the safety and controlls needed. The engine is 200mm tall and clutch is about 8cm, and can be included in the mast, since you need to DIY a mast anyway for shaft and gears. Now you can force exhaust through mast, reducing noise, and add aluminium bottom frame to hold it together acting as a cooling system for the engine. Vibration is the only thing that needs to be adressed
Answer from Jetsurf support:
The ball is from plastic - Polypropylene .
Melting point : 160°C
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Interesting Chinese gas jetsurf brand :
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Hahaha that is amazing. Looks more like a weed eater/edge trimmer.
Great work, well done.
Do you have any further details and video?
Was it difficult to start and stand up?
Isn’t it what we’re after after all with a 90° angle transmission instead of 45 ?
Yep, a 90° edge trimmer gearbox would be the right thing and should hold up pretty well. You’d just need to do waterproofing.
Standing up is not difficult, but the speed is too slow and the voice is a little fried
I have a slow Internet connection to upload videos to YouTube
Do you know the rpm and motor power ? We have plenty of propeller models (FR, P-King, Flite, Manta, …) to improve this but if the rpm is halved, we cannot increase the prop diameter that much …
It could be this, it seems to be the biggest 2 stroke version at 63cc
It gives a motor RPM but we would need to know the gearbox ratio
Specifications:
Engine type: Single cylinder
Stroke: 2 stroke
Cooling System : air-cooled
Engine model: 1E48F
Displacement : 63cc
Max. Power: 2.3kw/8000rpm
Start system: Recoil start(manual start)
Ignition system: CDI
Mixing ratio(Gasoline:oil) : 25:1
Gasoline tank capacity: 1.2L
Idle speed: 3000rpm
Gear ratio: 2.08(27/13)
Propeller diameter: 18cm
Propeller options: 7-1/4*5-A inch
Running speed: 15–18km/h
It is given at 20.8 (27/13), normally it is output over input but cannot confirm. This would mean the output (the prop) turns at twice the motor rpm
Using a gas engine is pretty dissuasive. With so much weight over the board during a fall, the chances of the engine overturning and taking on water are not negligible. Then folows the urgent maintenance session otherwise water especially salted will corrode all moving parts (piston, cylinder, valves, connecting rod, crankshaft, etc.): drain the fuel system, [If salt water: rinse the engine thoroughly with fresh water], dry the engine (compressed air + water-repellent product), start and run the engine.