hello all I'm building my golo kit and I'm horrible at doing gearing and such to get speeds right, so what motors and or gear boxes do you recommend to get the proper speed from the golo transport? Thanks, Jason
I run my Golo (scratch built, not one of Mark's kits) on two of these http://www.hobbyking.com/hobbyking/store/__8621__2210N_1000Kv_Brushless_Motor.html -- direct drive, no gearing, and I need to run at about 25% of full power to run at legal Big Gun transport speeds. If I was doing it again I would use a smaller diameter motor to save space, but the ones above are cheap and work well.
The Golo doesn't need much power, mine only pulls about 9 watts. So pick a small motor that will turn a prop at 6000+ RPM. One possibility is the motor and gearbox I used, a GWS airplane unit. Check out this link http://www.radicalrc.com/category/G...Motors-107 and look at the first on the page, the IPS. The "A" ratio would be the right one. I found a lot of these at swap meets dirt cheap. You can also use a direct drive 280 motor, I think BC sells one that would be suitable. I even have a 130 size motor running my yard oiler, which is similar in size to the Golo but has only one prop. The issue with a lot of small motors is that they are going to have too much RPM, so look for motors with a Kv of 1500 or less. If Kv is not listed, which is common for brushed motors, make sure it is recommended for use with a 6" or bigger [air] propeller.
ok thanks Mark, I have a couple of those 280 motors laying around I will run 2 of those direct drive to see how that works jason
I located some new motors for the Golo and tested them out tonight. The motors are so cheap that the shipping costs more than the motors! The motors are sold by surplussales.com: DC Motor 24v DC / 60 ma Enlarge Image (MOT) HF263G Johnson DC motor. 24v DC, 60 ma (no load). 18mm (0.709") x 23.3mm (0.923"), 1.344" overall length. 2mm (0.775") x 9mm (0.368") round fluted shaft. 2 mounting holes on face, 15.5mm c-c. External access to brushes. 30,000+ pcs available! 40¢ each - 33¢ (10+), 28¢ (100+), 23¢ (500+), 20¢ (2.5k+), 15¢ (10k+) First I tested the existing motors on the Golo: I have a pair of 3/4" 25 pitch props at 4700 RPM and running about 36 seconds. Amp draw was 1.0 amps (single motor - geared). Based on my thrust testing, that should be about 2 oz of thrust for both props together. Next I tested the new motors. I measured a no load Kv of 620 RPM/V. Next were the in-water prop tests. I used my 1/96 scale yard oiler for the tests since it only has one prop. Prop Battery Voltage RPM Amps 3/4" 3 blade 2 cell LiFe 6.5 2230 0.3 3/4" 3 blade 3 cell LiFe 9.7 3600 0.3 3/4" 3 blade 3 cell LiPo 12.3 4920 0.4 3/4" 3 blade 4 cell LiFe 13.0 5100 0.4 3/4" 3 blade 5 cell LiFe 16.3 6450 0.5 1" 4 blade 2 cell LiFe 6.5 2060 0.3 1" 4 blade 3 cell LiPo 12.3 3850 0.5 So the motor needs about 12 volts to make the RPM needed to propel the Golo. Power usage for two motors/props would total 10 watts, versus 7 watts for my current geared system. A little less efficient, but I would trade the increased power usage to get rid of the gear noise. Plus, the current geared system is dialed down to 35% to make speed, making it almost an on/off system. Based on the tests with the 1" diameter prop, this looks like a great motor for my oiler, which can use a larger diameter prop than the Golo. Convoy speed in Battlestations is 44 sec, so I may even be able to use a 2 cell LiFe pack. The motors have carbon brushes and the bearings are easy to oil Mounting couldn't be simpler. I wrapped the motor with tape and glued it to a block on the bottom of the ship. I connected to the 1/16" drive shaft with a length of 1/16" ID Clippard tubing.
