[tccrockets] Re: Rock sim
- From: Gene Engelgau <gene@xxxxxxxxxxxxxxxxxxxxxxx>
- To: tccrockets@xxxxxxxxxxxxx
- Date: Tue, 7 Feb 2012 09:28:04 -0800
Hey Robert, So I'l stating the obvious and the deceleration is why air
frames get zippered. The Iris chutes in particular open very fast since
they are shallower. I'm working in a slider device to moderate that...
more on that later.
-G
On Tue, Feb 7, 2012 at 9:21 AM, AiRobert <airobert@xxxxxxxxxxxxx> wrote:
> I ran into something interesting while doing some Rocksim work for my
> L3, a ten inch Thumper.
> http://stores.whatsuphobby.com/-strse-10/Polecat-Aerospace-10%22-Thumper/Detail.bok
> ****
>
> ** **
>
> http://www.rocketreviews.com/file-4841/mod_polecat_thumper.rkt****
>
> ** **
>
> The max acceleration was showing 900+ f/s/s which is ~30g, yet it wasn’t
> clearing the rail at a high enough speed for stability (50f/s.) Normally
> 10g is plenty. So I reran the sim with bigger and smaller motors and
> watched the details at launch. I couldn’t find any acceleration over
> 180f/s/s (5g using M1230)****
>
> It turns out that the acceleration of 900 f/s/s was actually the *
> deceleration* when the main chute popped out at 800 feet. Once the drogue
> chute was resized the numbers started making sense.****
>
> WOW who woulda thunk…****
>
> RZ****
>
> ** **
>
--
- Regards
Gene Engelgau
KI6IBL, NAR 86770 / TRA 12243 - L3
http://fruitychutes.com - Consumer and Aerospace Recovery Solutions
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