Re: [Openrocket-devel] Openrocket-devel Digest, Vol 72, Issue 13

[Wes C. <wcr...@co...>]

It'll be interesting to find out if that is even possible with the sim
engine.  From what I recall the nose cone has to be representable by a
mathematical function and therefore not an abstract shape or spline.  But I
don't profess to have the best recall ever, and no time to double check.

Wes

On Thu, Feb 16, 2017 at 5:26 PM, Kingsley, Dennis <dki...@dr...> wrote:

> I have been looking into importing a profile curve for nose cones for the
> last week. Also adding spherical tips to existing generated nosecones. I
> may have a prototype by the end of the week.
> Dennis
> Sent from my iPhone
>
> On Feb 16, 2017, at 6:14 PM, K' Tesh <kt...@ho...> wrote:
>
> > Have you tried something like Sketchup or a CAD package?
>
>
> No, I don't have either program, and I'm trying to create better sims of
> nosecones in OR.
>
>
>
> > I've always managed to get close enough by using the setting options
> that
> are there and using my eyeball.  One thing that has helped me is to ensure
> that the zoom on the screen is providing a 1:1 ratio to the real world and
> then comparing the cone by holding it up to the profile view on the screen.
>
> This doesn't work very well when the nosecone is longer than the screen is
> wide.
>
> Also, I've got these annoying bulges where the forward portion of the
> nosecone (typically hemispherical) meets up with the ogive portion of the
> back of it.
>
> If we could import a shape, that should eliminate that kind of odd
> appearance.
>
> Looking at Wikipedia, I found that E = radius/(1/2 diameter of
> cylinder)...  so if the cylinder is 200mm in diameter, and the radius is
> 120mm, the curve (E) is 120/100 = 1.2
>
>
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