Airframe measurements for a semi unibody H frame
Posted: Wed Aug 19, 2015 6:15 am
I have a few questions as I embark on my first Quatos based build.
Here is a pic of the frame to be used...
The main part of the frame is unibody. The arms aren't separate. There is a small protrusion on the front where a pico camera will sit. On top there is a protective piece of carbon fiber held up by 4 standoffs. Then there is a lower level cage, which consists of a battery holder in back and camera holder up front. The arms are on standoffs which lifts the craft up.
Excuse me for my ignorance. Math and geometry isn't my strong suit.
Being that the arms are attached how do I determine the weight (mass) of each arm in the XML? Should I just measure the weight of the unibody and divide it by 4?
What would the body center be? My guess is if I put all 4 motors on and tied string from corner to corner that would give me a center. In terms of looking at the bodies dimensions, I'm going to assume that I'd measure the center portions length, width, and height -- this includes the unibody sans arms and the bottom cage. Is my thinking correct? Or is the unibody (main carbon layer) considered on entity and the cage another?
What if the ESCs are not in the same place on the back as on the front. How would this be represented in the XML in terms of distance from center?
Do I need a caliper to do measurements or is a simple ruler sufficient?
Thanks for helping out!
Here is a pic of the frame to be used...
The main part of the frame is unibody. The arms aren't separate. There is a small protrusion on the front where a pico camera will sit. On top there is a protective piece of carbon fiber held up by 4 standoffs. Then there is a lower level cage, which consists of a battery holder in back and camera holder up front. The arms are on standoffs which lifts the craft up.
Excuse me for my ignorance. Math and geometry isn't my strong suit.
Being that the arms are attached how do I determine the weight (mass) of each arm in the XML? Should I just measure the weight of the unibody and divide it by 4?
What would the body center be? My guess is if I put all 4 motors on and tied string from corner to corner that would give me a center. In terms of looking at the bodies dimensions, I'm going to assume that I'd measure the center portions length, width, and height -- this includes the unibody sans arms and the bottom cage. Is my thinking correct? Or is the unibody (main carbon layer) considered on entity and the cage another?
What if the ESCs are not in the same place on the back as on the front. How would this be represented in the XML in terms of distance from center?
Do I need a caliper to do measurements or is a simple ruler sufficient?
Thanks for helping out!