thanks for supplying that explanation Dread!
)I struggled at 1.00am getting it that simple
, but thats the basis really of gearing, in my application pictured, motor was running too hot, run time was very short, and the batteries where being drained by a high amp draw as 1:1 or direct drive, that motor is actually too high kv, didn't know it at the time as brushless info in my sort of boats was pretty much unavailable two years ago, just now in the process of fitting a lower kv motor which should improve things.
I think, MFA supply the gears pre bored at 4mm, so if your motor is a smaller shaft, perhaps you could sleeve the gear? mine are all 5mm and 6mm motor shafts, so I don't have that problem. The mount was custom made by a good friend, I am very lucky!, so maybe you will need to fabricate your own?
Dead right Bluebird, it took a while to get the gears to be lined up correct, when I remove and replace, I use a straight edge over both, its amazing how much speed is lost, and how much the amp draw increases if they are not lined up correctly, or the belt is too tight (I use eagle tree data logger to record all the runs). If you see the video of the belt drive, it doesn't walk much on the gears, but I do use gears with flanges for the reason Bluebird has mentioned.
Mark,don't really see the relevance with your post mate, I never mentioned gearing up, or down,
just the principles of gearing in general, and the actual findings of what happened to me. If I can share my actual experiences to help people save time and money, then I believe thats what the forum is about, it took me 8 months to arrive at that short post in terms of the experience of changing gear ratios, and of course props, I do understand what you are talking about, but it was 1.00am when I posted!
Lt, the noise is fantastic, and can be best compared with a turbine, but I think it was just luck getting that, a combination of the alloy mount, motor, and the motor area resonating like a sound box
