Re: Re: Spring rates for VP props

From: Nick Ray <lasray_at_gmail.com>
Date: Fri, 15 Feb 2013 13:38:01 -0500

Hi Mike,

> >> What works for you?
>
My honest answer here is I don't know. For me that makes the question
> fascinating. My springs are perhaps the weakest area in my program at the
> moment. I have recently become very interested in better understanding what
> going on with my props in general.
>
If we assume that the geometries of the hub don't change and we are just
> swapping out springs. Then, a spring that goes from .08 to .11 is softer
> than a spring that goes from .06 to .12 for a given theta.
>

I have tried both soft and stiff springs and as of yet I have not been able
to tell a significant difference between the two. I don't have torque
numbers in in-oz for what I use because my meter is uncalibrated. My best
guess at this point is that spring stiffness probably has a fairly small,
but perhaps not insignificant impact on flight time. Because its difficult
to make a large number of good flights with one F1D before its damaged and
starts flying differently, its hard to tell if one spring is better than
another or just normal variability in flight times.

I actually used as an example to teach my AP Stats students about effect
size yesterday.

Regards,

Nick
Received on Fri Feb 15 2013 - 10:38:02 CET