Je suis à Lorient et toi ? Oui on est parti à peu près dans la même direction, n’hésite pas si tu souhaites discuter de certaines choses en privé (en français).
I know the AquaStar motor is given for 10S but someone on hobbyking said using it at 12S and 80A without heat problem. Peharps longevity will not be good at this voltage, but regarding the price (around 50€) I can cheaply replace it from time to time.
Regarding the batteries I think even 2C could be enough with a good gearbox and propeller. That correspond to almost 1500W. I plane to consume a bit less during cruising (around 1000W).
Yes, I use a double lip seal just before the prop.
I played with the same motor but in direct drive, using it at 6s pulling 2KW. I quickly burnt a current controller and a 120A ESC (aquastar) but the motor seems fine… i’m switching to a bigger motor though.
yes (the only one i found as well) , very good quality, need brake down a bit and cleaning and change grease 2-3 times, just the shaft needs m10x1, not easy to find, the thing about glue (or laser weld) the pignon too a 5mm motor shaft
I took the opportunity to measure some electric consumptions on a 10S battery, full throttle:
Motor alone: 58W
Motor + gearbox: 88W
Motor + gearbox + axis + seal: 108W
… + propeller (in air): 126W
It’s interesting to see that the gearbox don’t “eat” too much power, around only 30W after severals seconds (when the grease inside become hot enough). Peharps more with some load?
The double-lip seal consumes about the same (30W).
Propeller in air only 18W.
I remenber to have read on this forum that an aproximately equivalent outrunner consumes about 80W with no load. That tends to show that an inrunner+gearbox have comparable efficiency that an outrunner alone (but inrunner is thinner and lighter).
Very promising data and setup you are building, it looks like Peters build or a lift model. You are using the same prop as i do for my direct outrunner, direct cooled. This thin pipe gives you a better oncoming flow for the prop than a cone could do.
I estimate the drag to be lowered by 10N compared to 63mm diameter at 8m/s.
Thanks. I hesitated a long time to follow you in the choice of direct drive outrunner for my setup. I like its simplicity. For rather slow speed, it might be a good alternative. A difference of 10N is not very important.
as far as i tested this gearbox, i will be too not worried about temp
and yes the vortex created is pretty big with the solas prop, very nice set up to test, me i am in hurry to be in the water as soon as finish, so i guess i will skip this test part but you can get something like this: COMING SOON