Help building a quadcopter frame

Hey guys, this is my first time posting here and my first time dealing with quadcopters.I have a few questions regarding frames. I built my first frame made of aliminium but it weighed in way to high at around 1.2kg frame only.So i scraped that frame and decided to go with something didferent and lighter like this.http://diydrones.com/m/discussion?id=705844%3ATopic%3A981585https://api.ning.com/files/kUatzdgzHA0uFMW4m3zElZs9KQcbDtyeKHJSiGwygLt03bAYmQ**J9COEFdA0fINXUcAfKvw7R3-VLjNfz7Fjw__/100_5043.JPGI have a few questions...What are common weights for frames and what is to light and to heavy? Does this effect the way it performs in the windAlso how long should my arms be? Is there a common lenth or can i just choose a good size myself?Thanks for the help!

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  • Original 3DR arms are 11 inches. (Did you see my earlier reply?)

    The arm length on my 2nd is 9.75 inches (but the central body is larger and keeps the tip-to-tip length the same as original).

    -=Doug

  • Ok cool thanks man

    So my arms are really long as at the moment, way too long (i think) which is probally taking up atleast 50grams, so i can make the arms what ever lenth i want??

    Cheers
  • Thanks for your replys

    So weight is not a big factor. Also when you say 9minutes fly time, is this with the go pro fitted?

    I also bought this frame incase things didnt work out with my other

    https://touch.trademe.co.nz/listing/view/543438504

    Also, is balance a big issue, i figured maybe not with the gyro??

    Thanks again
  • The 'B' chassis had the following dimensions:

    Arm tip to arm tip: 25.45 inches (central frame plates are included)

    Individual arm length: 11.02 inches (another odd value - round down to 11.0)

    That should get you moving towards something that will work with Arducopter default values.

    -=Doug

  • Are you familiar with the 3DR drawings of the 'B' chassis? (It looks like they pulled it from the 3DR store - not sure about redistribution issues of IProp though it is out of production.)

    I see you found my sneek peek of the 2nd build - clever fellow. I have machined some material off the ends of the arms since that photo. The point was to make it more visually appealing and to provide easier access to the m'otor mounting hardware. The 'C' version of the 3DR chassis puts large access holes on the underside of the arm. Fishing screws into those will be difficult so why not remove the entire area anyway? It serves no structural purpose.

    I will sketch you us something on the orginal dimensions and post it here. The 'C' chassis has slightly shorter arms than the 'B' chassis.

    -=Doug

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