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After watching 2 more 1/10th scale servos go up in smoke at ECC, and watching another TXT have flawless steering I have pulled the trigger on using 1/4 scale servos on the TXT.
Now, you have to watch here and be careful as the biggest servos in terms of torque are analog only. The Hobbico CS80 and the Hitec 805BB, both are about 343 oz-in @ 6V. My biggest concern here is that yes the gears are big, but they are nylon gears. Given my ablitiy to break nylon gears, and stripping out metal geared servos, as much as I want the biggest of the big I have my concerns. The anolog servos are very cheap, in the $30-40 range. Now, I have the Hitec 5745MG digital servo. This puts out 260 oz-in @ 6V, and is a full metal gear servo. Being digital it is more expensive at about $80 a servo.
The advantage to the 1/4 scales isn't massive torque above and beyond what the 1/10th scales are any more. Early on 1/4 was the only way to get very high torque servos. Now more airplane guys are using 2 1/10ths in place of 1 1/4, or just in need of 1 smaller servo so the 1/10ths are making the torque of the 1/4 scale servos.
The advantage here is in heat dissipation. The FETs on the servo board get hot during use. Think of FETs as an ESC for your servo's motor. There is not much real estate in a 1/10th scale servo for heat sinks to be added, nor is there much airspace for convection cooling. In a 1/4 scale servo you have a much bigger board, case, and airspace surrounding the FETs, thus keeping them much cooler.
In talking with Hitec keeping the FETs cool is key here. I was informed by Hitec that I should try a 1/4 scale servo or run 2 1/10th servos for steering. Given the cost options for being ready to run this weekend I went with the 1/4 scale servos. I am also a pinch gun shy that I could smoke 1 servo in the 2 servo steering and given the recomendation of not linking the servos together that worries me.
Anyways, if you have a super that you have the room for this big of a servo in give them a look. They are not for everyone, but they are still very useful.
Now, you have to watch here and be careful as the biggest servos in terms of torque are analog only. The Hobbico CS80 and the Hitec 805BB, both are about 343 oz-in @ 6V. My biggest concern here is that yes the gears are big, but they are nylon gears. Given my ablitiy to break nylon gears, and stripping out metal geared servos, as much as I want the biggest of the big I have my concerns. The anolog servos are very cheap, in the $30-40 range. Now, I have the Hitec 5745MG digital servo. This puts out 260 oz-in @ 6V, and is a full metal gear servo. Being digital it is more expensive at about $80 a servo.
The advantage to the 1/4 scales isn't massive torque above and beyond what the 1/10th scales are any more. Early on 1/4 was the only way to get very high torque servos. Now more airplane guys are using 2 1/10ths in place of 1 1/4, or just in need of 1 smaller servo so the 1/10ths are making the torque of the 1/4 scale servos.
The advantage here is in heat dissipation. The FETs on the servo board get hot during use. Think of FETs as an ESC for your servo's motor. There is not much real estate in a 1/10th scale servo for heat sinks to be added, nor is there much airspace for convection cooling. In a 1/4 scale servo you have a much bigger board, case, and airspace surrounding the FETs, thus keeping them much cooler.
In talking with Hitec keeping the FETs cool is key here. I was informed by Hitec that I should try a 1/4 scale servo or run 2 1/10th servos for steering. Given the cost options for being ready to run this weekend I went with the 1/4 scale servos. I am also a pinch gun shy that I could smoke 1 servo in the 2 servo steering and given the recomendation of not linking the servos together that worries me.
Anyways, if you have a super that you have the room for this big of a servo in give them a look. They are not for everyone, but they are still very useful.
Just ask away if there is something you don't understand.
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