What he said ^^^Mark_A_W wrote:Torque Arms.
And put the batteries in the frame (build a headway pack to suit). In the backpack gets heavy after a while, and the connection is annoying....but it's better than a rack, which will RUIN the handling completely.
I'll try to add something a couple times a week. I'd love to hear your plans if you want to post an overview of what you want to achieve and what parts you are looking at.Looks like an interesting build and i plan to do something quite similar myself in the near future, so make sure to give some regular updates
Yeah, don't want to forget those. I plan on using two torque arms on each axle or two custom made torque plates on each. The rear dropouts are very beefy but the fronts may need modification. I've read enough stories on here about snapping dropouts to make sure I give this plenty of attention.Torque Arms.
I don't want to build a pack at this time because I know it would take quite a while as I have very little tinkering time at present. That would be the idle solution but I think that will have to wait for when it's time to do upgrades.And put the batteries in the frame (build a headway pack to suit). In the backpack gets heavy after a while, and the connection is annoying....but it's better than a rack, which will RUIN the handling completely.
Thanks for that I didn't know about that site or their headway packs. I did some measuring and even the 10ah pack won't fit in the triangle but that pack looks really good. 6C max rate is more then enough for running both motors and it's pretty light. I'm putting that pack to the top of my battery list.Go to ev components and look at their 48/10 headway pack. The 48/20 won't fit into the triangle.
Sorry, meant to reply sooner but got distracted. I did see that controller but I'm going with two small controllers for redundancy although that looks like a good option too.lynchy wrote:I know of 1 company that does a dual controller but don't know any details but have had a few controllers off them and been in contact with the sales lady there and she was real helpful, she went by the name of Kitty. Can forward her email if you drop me a PM. I'll likely be looking into 1 of these in the not too distant future as it should mafe the interfacing easier than 2 seperate controllers.
What you are planning sounds good, especially the over volting. I won't over volt mine to start with but may do that after i see what kind of performance I get out of a conservative setup.I've got a few of these cute motors and got 3 different MTB, 2 hardtails and a full suspension on there way. The Hardtails will likely be prototypes for a future project but the full suspension will be my plaything I reckon 2 overvoltaged cute motors should be quite interesting or maybe even 2 of the bigger bad boys in there Now that really would shift.
I was thinking the exact same thing when I found out I couldn't get one of the 128 rear motors that would squeeze into 135mm dropouts and had to switch to the 108. My order still hasn't shipped as far as I know so I'm still considering doing just that.lynchy wrote:If you're going for 2 hub motors I'd consider a higher revving motor if you're sticking with standard voltage. I know the motor for 20" rim spins to about 290rpm roughly (got 1 here (24V) so I'll try to get around to checking that) and having 2 will overcome the lack of torque.
Because I'm way too cool for just onemonster wrote:why do you want dual motors?
that may not be the best comparison since most folks would choose a higher KV motor than the 5305 to run at such a low voltage, such as a 5302 or 5303. 5305 is wound for high voltages, such as 72 volts, so performance at low voltage is not so good @36v. A 5305 on 36v is like having a V-8 that runs on 4 cylinders.Russell wrote:Then compare the dual eZee's to a single X5305 at 36V/40A/26" which produces 52.5 lbs of thrust at 0mph and just 18 lbs at 15mph.
That's another thing I was thinking that 2 wheel drive might provide but didn't include in my reply as I haven't seen any real world head to head tests to confirm it. Will they really give more thrust at a given wattage? Will they be more efficient with less load on each motor? Less heat buildup?The simulator at ebikes.ca doesn't have any geared motors smaller than an eZee but I still find it useful to use the eZee as a stand-in for one of my 250W motors keeping in mind that I need to adjust the results down by perhaps 20%. Anyway if you pit two eZee geared motors running at 20A against any other single motor running at 40A the dual motors comes out on top by a good margin. For example dual eZee's at 36V/20A/26" will produce a combined thrust at 0mph of 90 pounds and at 15mph it's 36 pounds. Compare that against the BMC V2-T at 36V/40A/26" which generates 78 lbs of thrust at 0mph and 24 lbs at 15mph. Top speed of both set-ups would be 21-22 mph. Then compare the dual eZee's to a single X5305 at 36V/40A/26" which produces 52.5 lbs of thrust at 0mph and just 18 lbs at 15mph. Of course dual Cute's or Bafangs won't be quite as strong as the dual eZee's but you can pick up two of Cutes or Bafangs for less than the price of a single eZee motor.
I'm really looking forward to that part. Being able to power through a corner and maybe doing some controlled skiddingdogman wrote:I really really like front hubs on the street though, since you can power through a corner with both wheels grabbing traction. My town has just about all the wheelchair ramps done on the sidewalks, so I don't need to pop over curbs any.
I chose the X5305 to make the comparison as even as possible selecting motors that had top speeds in the same range, 21-22 for the eZee and BMC V2-T and about 19 mph for the X5303. The next step up, the X5304, might have been a better choice with a top speed of about 23mph at 36V/40A/26". The X5304 would generate lower torque at 0mph (51 lbs) than the X5305 but more at 15mph (29 lbs) but again these would be less than the dual eZee's at 36V/20A/26" at 90 lbs and 36lbs respectively. The comparison was an exercise showing the low speed thrust which can be achieved using two smaller geared motors compared to a single motor while keeping the voltage and total current the same, I was not suggesting someone would necessarily want to build an X5/36V system.will_newton wrote:that may not be the best comparison since most folks would choose a higher KV motor than the 5305 to run at such a low voltage, such as a 5302 or 5303. 5305 is wound for high voltages, such as 72 volts, so performance at low voltage is not so good @36v. A 5305 on 36v is like having a V-8 that runs on 4 cylinders.Russell wrote:Then compare the dual eZee's to a single X5305 at 36V/40A/26" which produces 52.5 lbs of thrust at 0mph and just 18 lbs at 15mph.
...but I get your point.