GP Electricub with Magnetic Mayhem
10-25-2004, 05:18 PM
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GP Electricub with Magnetic Mayhem
I have a new Great Planes Electri-Cub on my building board and I just bought a Reverse timed Magnet Mayhem and GD600 gearbox with the 2.5:1 ratio. I found a great deal on some pre-made 7-cell GP3300 battery packs on ebay for $25.00. I am thinking about buying a couple of them, but I am debating about using 8-cell packs instead of 7-cell packs. Would I be losing a lot of power by using a 8.4 volt 7-cell battery?
I also just bought a Trinity Monster Maxx Pro 17-turn motor to try. I also bought another GD600 gearbox and both optional ratio pinion gears (3:1, 3.8:1). Which gear ration would be the best to use with this motor using a 12X8 or 11X10 prop? Would I need to use an 8 cell GP3300 pack or would a 7 cell GP3300 pack be enough?
I don't want the plane to be underpowered, I am used to having excessive on-tap power of glow engines.
I also just bought a Trinity Monster Maxx Pro 17-turn motor to try. I also bought another GD600 gearbox and both optional ratio pinion gears (3:1, 3.8:1). Which gear ration would be the best to use with this motor using a 12X8 or 11X10 prop? Would I need to use an 8 cell GP3300 pack or would a 7 cell GP3300 pack be enough?
I don't want the plane to be underpowered, I am used to having excessive on-tap power of glow engines.
10-25-2004, 06:43 PM
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RE: GP Electricub with Magnetic Mayhem
Think of cell count (Volts) as the "cubic inches" of electric power. If you replace a 454 cubic inch engine with a 305, you're going to get less power, all other things being equal, right?
You can get some of the lost power back by turning a larger/higher-pitched propeller at the cost of flight time, because you're drawing more Amps.
Take a look at PCalc on www.flydma.com. You can use it to compare different combinations to find the best one.
The 17-turn motor is slightly "cooler" than the 16-turn. That is, it will spin the prop slower in the same setup. This means you need a bigger/higher-pitched prop to get the same power, or higher voltage.
You can get some of the lost power back by turning a larger/higher-pitched propeller at the cost of flight time, because you're drawing more Amps.
Take a look at PCalc on www.flydma.com. You can use it to compare different combinations to find the best one.
The 17-turn motor is slightly "cooler" than the 16-turn. That is, it will spin the prop slower in the same setup. This means you need a bigger/higher-pitched prop to get the same power, or higher voltage.
