I'm using a 1/2" dia brushless in Othar, with a gearbox made from HobbyKing's brass gears (0.3M) because the motor shaft is 1.5mm and they were a convenient source for a gear that fit, and the larger gears that fit the 2mm stainless driveshafts.
Ok, I am able to fit 7/8" props. I have a question. The following motor http://www.hobbyking.com/hobbyking/store/__5229__BA_BL1230_4200kv_Brushless_Inrunner_Motor.html would I be able to use two of these direct drive? I am just looking to cut the weight. My current gear box and brushed motor combo is 100grams. Thanks Kim
That motor needs to be run geared. It would work with the 2.5:1 gear ratio you were looking at, but not direct drive. For direct drive you need something closer to 1500 Kv, like this motor: http://www.hobbyking.com/hobbyking/store/__5381__C2024_Micro_brushless_Outrunner_1600kv_17g_.html. It would be an almost ideal motor, but it does have a short shaft so you really need to get a longer 2mm shaft and replace the original, which is a pain.
Ok, I hope this is the last stupid question. Here is what I would like to do. One motor driving two shafts though a 2.5 to 1 gear box. This way I can save weight on the second esc but still go with the brushless and save weight. Thanks again Kim
That should work, it is very similar to my Golo setup. The 1230 4100Kv motor you mentioned before should work in this setup.
Cool thanks a ton. Guess I will be placing an order this weekend. Friday is payday. Lets see a couple motors couple esc's batteries and a charger with power supply. Thanks. Kim
The shafts driving the props are flexable - 1/16" steel cable from an R/C airplane flexable pushrod. The outer yellow sleeve keeps the flex shaft from moving anywhere and the cable easily bends though the curve. The gearbox and flex shafts are joined with some 1/16" ID Clippard tubing. Because the counter-rotation is done at the gearbox, torque on the motor and gearbox balances nicely to zero - the motor and gearbox are not actually mounted to anything, they just rest on the bottom of the boat.
I know I just thought of another question. My pump motor needs to be the same size or smaller. Would the http://www.hobbyking.com/hobbyking/store/__5229__BA_BL1230_4200kv_Brushless_Inrunner_Motor.html, work for the pump or do I need to find another motor? Thanks Kim
That motor isn't really suitable for a pump. You need either a very small impeller or gearing. Better to go with a larger motor for your drives that is available with a lower Kv.
Ok I think I have a solution for my Gearing Drive line. I am thinking of the following motor. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=5379. And I am thinking of the following ESC, http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=24567. Will the same motor work for a Battlersconnection micro pump. Also how big of a ESC will I need for the pump? Anymore suggestions on a brushless set up for my Gearing would be great. I am still going to trry to use a single drive motor into a gear box to drive both shafts. Kim
The motor looks good as far as Kv and total power capability. Note that the motor has a 2mm shaft, not 4mm as stated, and the shaft is pretty short. So you are going to have be creative to get it hooked up. That ESC should work, I have the 50 amp version sitting on my bench ready to go into my fast cat. However it is really too heavy for your destroyer. Remember that you need one controller for each motor. Two of those controllers will weigh almost 4 ounces. Check out the destroyer build threads, one of them mentioned a 10amp car controller that would be more suitable.
Been working on issues with my setup with the help of Tuggy,Snipehunter, Mike, and a few others. Everything would work fine until the pump turned on, the ESC's would just shut down. Once the pump was off, they would either start back up (all the beeps) or not until the main power was switched off and then on. Had an old programming card, turns out it had gone "bad" as it was stuck on READ. New card allowed me to setup the NEW 100 amp esc's. Added a spektrum "http://spektrumrc.com/Products/Defa...ID=SPM1600" in the chance this will help as well. So far so good, was able to cycle the motors forwards and reverse and trip the pump multiple times without losing an ESC. Of course this is the bench test, right... Sometimes the "bleeding edge" can take a lot of blood. Lou
I'm very happy that you stuck with the brushless and that it worked out. Your batteries will thank you, too.
I am at my end. I am really beginning to hate the brushless system. I can't get the esc's to program. One won't even work with my programing card. I have the following esc's HobbyKing 50A Boat ESC 3A UBEC. I have programed them with the card and when I hooked them up, the esc's start beeping and don't' work. I have tried looking at their website to get a manual and can't find anything. Nothing is appearing on the files tab. I thought I had them running but no such luck. Pretty quick if I can't find a manual I will be installing the old brushed system. I know that works! Any Help would be great. It has not been a good week. Thanks Kim
