Thursday
Oct082015

Quest for the 100MPH Plane

I feel the need,  the need for speed.  I am currently working on a 100+ MPH HobbyKing radjet.  I am not quite there yet,  but feel I am well on the way.  Here is the current state of things.  Below is a video from FPV Fest where I clocked it at about 75MPH..

 

How am I going to break 100MPH?  Bigger motors and bigger batteries of course!

 

First off,  some data (click the chart to open a larger version)...

 The data in orange is what I was running in the video you just watched,  the data in yellow is what I plan on running.  Notice nearly twice the thrust! 

 

Here is a better comparison of the two options...

Notice a few things...

  • nearly 3 times the amp draw
  • the prop speed is up to 164MPH from 97MPH
  • applying my actual losses I estimate the plane will go 125MPH

 of course, I figure that losses probably are logrithmic not linear, so the diminishing returns from actual losses due to more weight might be a bit more,  however I still feel pretty confident I can break 100.  The batteries are going to take some punishment.  I am going to need to run a 50C 1600MAH with an 80AMP ESC.  Stay Tuned!

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