torqueboards
1 MW
Car ESCs and Eboard ESCs Overheating
I guess, the reason why Car ESC's tend to overheat and our eboards don't is because running a Car ESC. You are literally running it at full power from the start with brakes and reversing. It's definitely a lot more strain on the ESC and motors versus on an eboard we simply go forward (no where near full power) and brake occasionally. I assume, this is why I have around 800+ miles on my eboard and it hasn't had any issues. The motor itself is not being stressed at all. Doesn't seem like there is any wear and tear on the motors either beside the cosmetic damage from being hit with rocks. This is a good thing but is also gives me a good reason that moving down in motor size would save on weight. No point in running these bigger motors while adding the extra weight.
Which means unless we are stressing the motors and escs to almost full capacity it is pretty much impossible to burn out the motors/esc. These motors are made for RC cars which are most of the time running at full capacity. We run these motors at 20-35% capacity 70-80% of the time when riding as we are simply just cruising.
Gearing Ratio and Motor Shaft Sizes
The gearing ratio isn't always flexible with smaller wheel sizes. The only problem with gearing ratio is for 76/83mm wheels we are limited to the size of the pulleys. It's much harder to achieve a 1:5 gearing ratio. From what I've noticed 14T HTD 5mm works well as there is enough threading on the pulley hub to effectively grab onto the shaft and not move. This is with an 8mm bore for the 63mm motors. I've tried a 12T and without a keyway it's better to go 14T. The 12T just didn't have enough grab on the threads. Moving down to a 42mm motor brings the shaft to 5mm. A keyway or a D shaped shaft/pulley would help in pushing that torque through than relying on the "set screws" also because the shaft is small.
With that said for example a 12T to be 1:5 would be a 60T. The max on an 83mm wheel is about 44T and on a 76mm wheel the max is a 40T Drive pulley. You can't go lower than 12T. 12T is also not even recommended a 14T would be a better choice as it would hold more teeth and more thread for the set screw to grab.
Max Gearing Ratio for 76mm wheel - The max gearing ratio on a 76mm wheel using HTD 5mm would be 12T/40T or even 38T fits better actually. That's a 1:3.3 gearing ratio. 14T/40T is 1:2.85 gearing ratio.
Max Gearing Ratio for a 83mm wheel - 12T/44T that's still only 1:3.6 gearing ratio.
90mm wheel = 12T/54T is 1:4.5 and/or 14T/54T is 1:3.85.
97mm wheel = 12T/60T is 1:5 and/or 14T/60T is 1:4.28.
That ratio isn't even including the other variables such as wheel size etc. That's just the max pulley size that would fit for those wheels. The 76mm/83mm wheels on HTD 5mm can only go up to around 1:3 to 1:3.6 gearing ratios.
Eboard ESC Braking
I agree it seems any braking above 15mph is asking to fly off my board. I definetly lean back when I try brake at higher speeds. It's better to coast it slowly. For this reason, it's safer at least for me to cruise at around 10-15mph speeds and any higher speeds I can't stop immediately which makes it very unsafe.
High Speed Eboards & Emtnboards
The higher speed eboards are not necessarily needed as much as a faster mountain board. With a mountain board the wheels are at least 8" which means we can effectively take advantage of the gearing ratios.
Belt Stripping
I'm curious to know why you are stripping all those belts. Is there not enough slack? Are the motors spinning to fast that they don't grip the teeth which strips the belts? What's actually causing the belt's teeth to come off? Have you tried using the heavy duty pulley belts from like SDP-SI.com which have fiberglass inside? My current ratio has 5 and 23 teeth in mesh.
LiPo C Rating
42 and 50mm motors at max amp run at 50-60amps. The typical 5000mah and 20C = 5ah x 20C = gives out 100 continuous amps. More than enough for a 42/50mm motor. There's no need to go 20C or more. Right?
New setup?
42mm dual motor setup 4S - I want to use a drop through deck while using 76mm wheels with a max speed of 25mph. This means on HTD 5mm my max gearing ratio would have to be 12T/40T at 1:3.3 or 14T/40T is 1:2.85. I'd prefer to use 14/40T but it changes the gearing ratio significantly. I have not done the calculations but would 1:2.85 gearing ratio work with a 4250-350kv SK3 motor? Otherwise 5055-280KV would be my second option.
Single 4S on 4250-350kv should reach 20mph? Max 53 amps.
1x - Hobby King Brushless Car ESC 100A w/ Reverse (Upgrade version) $35.99 4S 47x41x29 95g
1x - Turnigy Aerodrive SK3 - 4250-350kv Brushless Outrunner Motor $36.40 4-5S 1190watts - 53 amps 266g
1x - ZIPPY Flightmax 5000mAh 4S1P 20C $32.99 4S 143x51x33 469g 6" long
TOTAL COST = $105.38
TOTAL WEIGHT = 1.82 lbs
Dual 4S on 4250-350kv should reach 25-30mph? Max 53 amps each.
2x - Hobby King Brushless Car ESC 100A w/ Reverse (Upgrade version) $35.99 4S 47x41x29 95g 2x escs = 0.41 lbs 2x = $71.98
2x - Turnigy Aerodrive SK3 - 4250-350kv Brushless Outrunner Motor $36.40 4-5S 1190watts - 53 amps 58mm length 266g 2x motors - 1.17 lbs 2x motors = $72.80
2x - ZIPPY Flightmax 5000mAh 4S1P 20C $32.99 4S 143x51x33 469g 6" long 2x = 2.06 lbs 2x = $65.98
TOTAL COST = $210.76
TOTAL WEIGHT = 3.64 lbs
Dual 6S on 5055-280kv should reach 30-40mph? Max 60 amps each.
2x - Hobby King 150A High performance Brushless Car ESC $68.99 6S 55x60x40 150g 2x escs = 0.66 lbs 2x = $137.98
2x - Turnigy Aerodrive SK3 - 5055-280kv Brushless Outrunner Motor $49.23 6-10S 1510watts - 60 amps 59mm length 369g 2x motors - 1.62 lbs 2x motors = $98.46
2x - Turnigy 5000mAh 6S 25C Long Lipo Pack $52.99 6S 299x55x26 820g 12" long 2x = 3.6lbs 2x = $105.98
TOTAL COST = $342.42
TOTAL WEIGHT = 5.88 lbs
Those setups above I think work out pretty well. Let's say the board/trucks is about 7lbs. It comes out to 10-16lbs give or take. That 16lb board dual 6S w/ 50mm motors is going to be a pretty powerful. I would think is pretty much exact to what BoostedBoards is running. 5000mah gives me about 8-15 miles.
Rider weight?
I'm about a total of maybe 200 lbs on my board with my backpack on. Do you think someone who is 230-240 lbs it would make a difference? I would think it would be harder to get a single 4S setup to 20mph for them.
I guess, the reason why Car ESC's tend to overheat and our eboards don't is because running a Car ESC. You are literally running it at full power from the start with brakes and reversing. It's definitely a lot more strain on the ESC and motors versus on an eboard we simply go forward (no where near full power) and brake occasionally. I assume, this is why I have around 800+ miles on my eboard and it hasn't had any issues. The motor itself is not being stressed at all. Doesn't seem like there is any wear and tear on the motors either beside the cosmetic damage from being hit with rocks. This is a good thing but is also gives me a good reason that moving down in motor size would save on weight. No point in running these bigger motors while adding the extra weight.
Which means unless we are stressing the motors and escs to almost full capacity it is pretty much impossible to burn out the motors/esc. These motors are made for RC cars which are most of the time running at full capacity. We run these motors at 20-35% capacity 70-80% of the time when riding as we are simply just cruising.
Gearing Ratio and Motor Shaft Sizes
The gearing ratio isn't always flexible with smaller wheel sizes. The only problem with gearing ratio is for 76/83mm wheels we are limited to the size of the pulleys. It's much harder to achieve a 1:5 gearing ratio. From what I've noticed 14T HTD 5mm works well as there is enough threading on the pulley hub to effectively grab onto the shaft and not move. This is with an 8mm bore for the 63mm motors. I've tried a 12T and without a keyway it's better to go 14T. The 12T just didn't have enough grab on the threads. Moving down to a 42mm motor brings the shaft to 5mm. A keyway or a D shaped shaft/pulley would help in pushing that torque through than relying on the "set screws" also because the shaft is small.
With that said for example a 12T to be 1:5 would be a 60T. The max on an 83mm wheel is about 44T and on a 76mm wheel the max is a 40T Drive pulley. You can't go lower than 12T. 12T is also not even recommended a 14T would be a better choice as it would hold more teeth and more thread for the set screw to grab.
Max Gearing Ratio for 76mm wheel - The max gearing ratio on a 76mm wheel using HTD 5mm would be 12T/40T or even 38T fits better actually. That's a 1:3.3 gearing ratio. 14T/40T is 1:2.85 gearing ratio.
Max Gearing Ratio for a 83mm wheel - 12T/44T that's still only 1:3.6 gearing ratio.
90mm wheel = 12T/54T is 1:4.5 and/or 14T/54T is 1:3.85.
97mm wheel = 12T/60T is 1:5 and/or 14T/60T is 1:4.28.
That ratio isn't even including the other variables such as wheel size etc. That's just the max pulley size that would fit for those wheels. The 76mm/83mm wheels on HTD 5mm can only go up to around 1:3 to 1:3.6 gearing ratios.
Eboard ESC Braking
I agree it seems any braking above 15mph is asking to fly off my board. I definetly lean back when I try brake at higher speeds. It's better to coast it slowly. For this reason, it's safer at least for me to cruise at around 10-15mph speeds and any higher speeds I can't stop immediately which makes it very unsafe.
High Speed Eboards & Emtnboards
The higher speed eboards are not necessarily needed as much as a faster mountain board. With a mountain board the wheels are at least 8" which means we can effectively take advantage of the gearing ratios.
Belt Stripping
I'm curious to know why you are stripping all those belts. Is there not enough slack? Are the motors spinning to fast that they don't grip the teeth which strips the belts? What's actually causing the belt's teeth to come off? Have you tried using the heavy duty pulley belts from like SDP-SI.com which have fiberglass inside? My current ratio has 5 and 23 teeth in mesh.
LiPo C Rating
42 and 50mm motors at max amp run at 50-60amps. The typical 5000mah and 20C = 5ah x 20C = gives out 100 continuous amps. More than enough for a 42/50mm motor. There's no need to go 20C or more. Right?
New setup?
42mm dual motor setup 4S - I want to use a drop through deck while using 76mm wheels with a max speed of 25mph. This means on HTD 5mm my max gearing ratio would have to be 12T/40T at 1:3.3 or 14T/40T is 1:2.85. I'd prefer to use 14/40T but it changes the gearing ratio significantly. I have not done the calculations but would 1:2.85 gearing ratio work with a 4250-350kv SK3 motor? Otherwise 5055-280KV would be my second option.
Single 4S on 4250-350kv should reach 20mph? Max 53 amps.
1x - Hobby King Brushless Car ESC 100A w/ Reverse (Upgrade version) $35.99 4S 47x41x29 95g
1x - Turnigy Aerodrive SK3 - 4250-350kv Brushless Outrunner Motor $36.40 4-5S 1190watts - 53 amps 266g
1x - ZIPPY Flightmax 5000mAh 4S1P 20C $32.99 4S 143x51x33 469g 6" long
TOTAL COST = $105.38
TOTAL WEIGHT = 1.82 lbs
Dual 4S on 4250-350kv should reach 25-30mph? Max 53 amps each.
2x - Hobby King Brushless Car ESC 100A w/ Reverse (Upgrade version) $35.99 4S 47x41x29 95g 2x escs = 0.41 lbs 2x = $71.98
2x - Turnigy Aerodrive SK3 - 4250-350kv Brushless Outrunner Motor $36.40 4-5S 1190watts - 53 amps 58mm length 266g 2x motors - 1.17 lbs 2x motors = $72.80
2x - ZIPPY Flightmax 5000mAh 4S1P 20C $32.99 4S 143x51x33 469g 6" long 2x = 2.06 lbs 2x = $65.98
TOTAL COST = $210.76
TOTAL WEIGHT = 3.64 lbs
Dual 6S on 5055-280kv should reach 30-40mph? Max 60 amps each.
2x - Hobby King 150A High performance Brushless Car ESC $68.99 6S 55x60x40 150g 2x escs = 0.66 lbs 2x = $137.98
2x - Turnigy Aerodrive SK3 - 5055-280kv Brushless Outrunner Motor $49.23 6-10S 1510watts - 60 amps 59mm length 369g 2x motors - 1.62 lbs 2x motors = $98.46
2x - Turnigy 5000mAh 6S 25C Long Lipo Pack $52.99 6S 299x55x26 820g 12" long 2x = 3.6lbs 2x = $105.98
TOTAL COST = $342.42
TOTAL WEIGHT = 5.88 lbs
Those setups above I think work out pretty well. Let's say the board/trucks is about 7lbs. It comes out to 10-16lbs give or take. That 16lb board dual 6S w/ 50mm motors is going to be a pretty powerful. I would think is pretty much exact to what BoostedBoards is running. 5000mah gives me about 8-15 miles.
Rider weight?
I'm about a total of maybe 200 lbs on my board with my backpack on. Do you think someone who is 230-240 lbs it would make a difference? I would think it would be harder to get a single 4S setup to 20mph for them.