As a follow up of my first tentative to build a suspended FPV quad , here come design Mark II. It uses mostly wood instead of aluminium. The whole blog consists of pictures with integrated comments on them. Enjoy...
End of part1... Next will come the assembly of the propellers protection system and of course the maiden flight. Stay tuned...
Comments
Hi Doug, my god you were reading my mind about the lamp rings! This is preceisely what I was going to do. I will gain therefore 30% of the weight...but shhhh still in progress, wait for the next batch of pictures & test flights.
Well done! It is nice to see a different perspective on a quadrotor.
You are, of course, obligated to share performance information with us. ;)
The 'over/under' propellor debate will probably need a bench test for good data. You certainly receive points for integrating it into this build. If weight needs to be shed (it *always* need to be shed) you could clip out the inboard section of your lamp rings.
I hope you can capture some video to share with us.
Build on!
-=Doug
@Steve, total weight is 1.5kg without battery. By the way , for clarity, the main battery sits on the bottom side of the plate. A second smaller battery for fpv can also be installed on top of the plate just next the fpv pod.
Dimensions of the quad : 40 cm from motor to motor.
that's awesome design! thanks for sharing.
This is one of the most detailed build logs I have ever seen. Good pictures and notations. The quad is sure to be super strong. Have you measured the final weight? I have 2 small concerns: your proposed battery location may not allow a center of craft balance point (might consider battery on bottom where there is more adjustment area), and the slightest tipping on landing could cause the propellers to touch the ground.
@ Stephen, yes as soon as it will be prepared for flight I will compare above and under. However apart from pure efficiency, putting mptprs under the arms reduces the air flow impact on the arms and thus vibrations.
What a beautiful build! Very clean. If you have a chance later on, could you please test something for us as a favor? Some people maintain that mounting the motors under the arm hurts your efficiency. Could you test the efficiency for props above and below the arms?