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<blockquote data-quote="Derek" data-source="post: 141786" data-attributes="member: 708">Ok.&nbsp; I appreciate your replies.&nbsp; Unfortunately, those aren't the answers that I was looking for and that's entirely my fault.&nbsp; I need to get more specific. I want to build a large size racing quad.&nbsp; Most likely, 550-600mm sized, on 6S,&nbsp; and I need help selecting motors/props.&nbsp; I had an idea for a motor/prop combination but, based on the math (if I did it right), it will most likely be a VERY inefficient setup and I'll likely damage the batteries pretty quickly....so, I've given up on that particular setup but I've not given up on the project.To select motors/props, you'll probably need to know the AUW of the quad.&nbsp; I can't give you that number because I don't have it built (not even started, lol).&nbsp; If I had to guess, I would guess that the AUW of the quad, with a 6S battery on board, will be in the area of 5-6lbs.&nbsp; Being a quad of this size, there will be enough clearance for 12-14&quot; props.Can you guys help me select some motors that will suit my project?I was looking at these motors yesterday with curiosity:<a href="https://hobbyking.com/en_us/quanum-mt-series-4108-475kv-brushless-multirotor-motor-built-by-dys.html" target="_blank">Quanum MT Series 4108 475KV Brushless Multirotor Motor Built by DYS</a></blockquote>

[QUOTE="Derek, post: 141786, member: 708"] Ok. I appreciate your replies. Unfortunately, those aren't the answers that I was looking for and that's entirely my fault. I need to get more specific. I want to build a large size racing quad. Most likely, 550-600mm sized, on 6S, and I need help selecting motors/props. I had an idea for a motor/prop combination but, based on the math (if I did it right), it will most likely be a VERY inefficient setup and I'll likely damage the batteries pretty quickly....so, I've given up on that particular setup but I've not given up on the project. To select motors/props, you'll probably need to know the AUW of the quad. I can't give you that number because I don't have it built (not even started, lol). If I had to guess, I would guess that the AUW of the quad, with a 6S battery on board, will be in the area of 5-6lbs. Being a quad of this size, there will be enough clearance for 12-14" props. Can you guys help me select some motors that will suit my project? I was looking at these motors yesterday with curiosity: [URL="https://hobbyking.com/en_us/quanum-mt-series-4108-475kv-brushless-multirotor-motor-built-by-dys.html"]Quanum MT Series 4108 475KV Brushless Multirotor Motor Built by DYS[/URL] [/QUOTE]

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