Re: 1.4 g F1D performance

From: <ykleetx_at_gmail.com>
Date: 14 Apr 2014 10:03:29 -0700

 Josh,
 

 You can't use the Hunt program to predict flight performance when the overall weight is the same and the only difference is the rubber.
 

 The program's prediction of time is directly proportional to the inverse of the sink rate and an empirically derived factor that assumes that the rubber weight is roughly 1.4X that of the airframe weight. And if the rubber weight is not 1.4X, there is a "penalty" factor. This penalty factor does not correctly account for the difference between 0.6 g and 0.4 g of rubber.
 

 Whatever the maximum performance of 0.6g would be -- say 45 minutes, the new rules will be slighly more than 2/3 of that, or 30 minutes. Why slightly more? I am assuming that the added weight could eventually allow us to stiffen up the airframe and *possibly* improve performance.
 

 -Kang
Received on Mon Apr 14 2014 - 10:03:29 CEST