@AlessandroSPQR I wish it was me taking the notes!
To be honest I've dug myself into a bit of a hole with this one! The Swordsman was I think the second model I started to build some years ago and whilst I'd learned quite a lot by then, not enough or more accurately flawed thinking to some extent.
I say this because I chose not to water-cool (this wasn't the flawed part) and to be on the safe side over-engineer the components which you can do without too much of a cost penalty with a model which you would want to avoid with full-size.
This has worked well with my smaller models upto 31 inches in length where I have chosen a maximum brushless motor diameter of 36mm. The Swordsman is only 2 inches longer but has a bigger beam and is considerably heavier and so I decided to go with a 42mm diameter for more torque. The problem with this is that as you go bigger the choice of kV becomes less and the kV lower with the result that the motor only has 800kV and hence why I've had to go with 4S to get good performance.
My flawed thinking is because I underestimated the power of brushed motors which was reinforced later by getting to know Bob/Zooma and Harry/Canabus who run longer models on no more than 36mm diameter. Bob does water-cool but Harry doesn't. Though Harry does run above 3S on occasions.
But by then I'd already got and fitted the motor and recently bought the 4S battery. They were both relatively expensive and if not used in this model wouldn't be used in another (well maybe the battery could be but not the motor) so I was committed really.
Anyway I've dug myself out of the hole by finding a 120amp HobbyWing Quicrun ESC that does take 4S and has the cooling fins and fan which I will leave in place.
My 120amp water-cooled Seaking ESC won't be wasted as I can use that in my water-jet project which has a water-cooled inrunner brushless motor and I have a 60amp version I can use in another build.
All of this is part of the fun and learning for me!
Chris
To be honest I've dug myself into a bit of a hole with this one! The Swordsman was I think the second model I started to build some years ago and whilst I'd learned quite a lot by then, not enough or more accurately flawed thinking to some extent.
I say this because I chose not to water-cool (this wasn't the flawed part) and to be on the safe side over-engineer the components which you can do without too much of a cost penalty with a model which you would want to avoid with full-size.
This has worked well with my smaller models upto 31 inches in length where I have chosen a maximum brushless motor diameter of 36mm. The Swordsman is only 2 inches longer but has a bigger beam and is considerably heavier and so I decided to go with a 42mm diameter for more torque. The problem with this is that as you go bigger the choice of kV becomes less and the kV lower with the result that the motor only has 800kV and hence why I've had to go with 4S to get good performance.
My flawed thinking is because I underestimated the power of brushed motors which was reinforced later by getting to know Bob/Zooma and Harry/Canabus who run longer models on no more than 36mm diameter. Bob does water-cool but Harry doesn't. Though Harry does run above 3S on occasions.
But by then I'd already got and fitted the motor and recently bought the 4S battery. They were both relatively expensive and if not used in this model wouldn't be used in another (well maybe the battery could be but not the motor) so I was committed really.
Anyway I've dug myself out of the hole by finding a 120amp HobbyWing Quicrun ESC that does take 4S and has the cooling fins and fan which I will leave in place.
My 120amp water-cooled Seaking ESC won't be wasted as I can use that in my water-jet project which has a water-cooled inrunner brushless motor and I have a 60amp version I can use in another build.
All of this is part of the fun and learning for me!
Chris
Scratch building 7 Faireys at a scale of 1:12 and also have 2 built by Dave Milbourn
Polubione przez AlessandroSPQR