tangentdave
1 kW
That's your freewheel crankset? If you remove the BB spacer on the drive side, which cog lines up with a straight chain? For the motor, I'd advise the 34t or 32t cog have the straight chain. The Tangent setup will give you about 375 crank RPM at 52V, and on a 27.5" tire that's 34mph (11rpm per mph). 6kW runs well when geared for 30-35mph single speed, so you'll want a 1:1 to the back wheel in the gear you'll use the most (the 30-35mph gear, so the same tooth cog as the front chainring). If the 32t cog is straight chain, that'll allow a couple gears faster or slower with a pretty straight chain to minimize excess wear from high powers.
I can add ISCG bolt holes, we'll have to work on the angle between the ISCG standard and where the drive should sit. What's your thinking behind using the tabs to hold the drive unit? The drive side of the frame looks to be flush with the face of the BB. Print out the ESC side PDF and see if it clears the suspension pivot on the left side when the upper cross brace bolt is flush with the bottom of the downtube (the two odd distances on the PDF are where the bolt passes between the mounts and sits against the frame to stop rotation).
On another note, I 'finished' the first of the 3220 housings today with only a minor machine crash. Well, to be accurate, I crashed it into the same same spot twice... This is a very complicated piece, it takes a long time to get the tooling and setup correct and repeatable. Hopefully tomorrow I'll have the CNC code proofed out and the first finished housing ready to receive the 3220 stator. I'll be finishing these kits two at a time, the first several pairs will take me a week each to get in a box for shipping to customers. Things will become faster after a few times through the process.
On yet another note, I'd thought I'd share a few pics of the Astro vs the Neu Motor. On paper both of these engines are the same electrically (225kV, 0.019ohm per phase). The Neu is a 3215/1Y, a touch larger diameter, half inch shorter, 6 pole pair, surface mount magnets with a wrap. The Astro is a 3220 3turn, a bit heavier, smaller diameter, 4 pole pair, internally mounted magnets. We know how the Astro performs (effen' awesome), we'll see how the Neu does. The laminations on the Neu appear to be thinner, it's tough to tell.
Astro stator on the left, Neu stator on the right.
Astro rotor on the left, Neu rotor on the right (NOTE: strong magnets)
-dave
I can add ISCG bolt holes, we'll have to work on the angle between the ISCG standard and where the drive should sit. What's your thinking behind using the tabs to hold the drive unit? The drive side of the frame looks to be flush with the face of the BB. Print out the ESC side PDF and see if it clears the suspension pivot on the left side when the upper cross brace bolt is flush with the bottom of the downtube (the two odd distances on the PDF are where the bolt passes between the mounts and sits against the frame to stop rotation).
On another note, I 'finished' the first of the 3220 housings today with only a minor machine crash. Well, to be accurate, I crashed it into the same same spot twice... This is a very complicated piece, it takes a long time to get the tooling and setup correct and repeatable. Hopefully tomorrow I'll have the CNC code proofed out and the first finished housing ready to receive the 3220 stator. I'll be finishing these kits two at a time, the first several pairs will take me a week each to get in a box for shipping to customers. Things will become faster after a few times through the process.
On yet another note, I'd thought I'd share a few pics of the Astro vs the Neu Motor. On paper both of these engines are the same electrically (225kV, 0.019ohm per phase). The Neu is a 3215/1Y, a touch larger diameter, half inch shorter, 6 pole pair, surface mount magnets with a wrap. The Astro is a 3220 3turn, a bit heavier, smaller diameter, 4 pole pair, internally mounted magnets. We know how the Astro performs (effen' awesome), we'll see how the Neu does. The laminations on the Neu appear to be thinner, it's tough to tell.
Astro stator on the left, Neu stator on the right.
Astro rotor on the left, Neu rotor on the right (NOTE: strong magnets)
-dave