[roc-chat] Re: Punisher on a K1440

  • From: John Coker <john@xxxxxxxx>
  • To: roc-chat@xxxxxxxxxxxxx
  • Date: Sat, 6 Jun 2015 16:40:02 -0700

Dry (airframe and electronics, no motor or no laundry), I get a C.G. of
31.25" from the tip, which RockSim says in 1.0 caliber stable with the
K1440.

Since the laundry will be forward of this point, I think mine will be fine
without added nose weight.

FYI, my dry weight is 3.5#, but I still have the main airframe to paint so
it'll probably be a bit more than that afterwards. Yes, it's still in
primer on the weekend before the launch. :)

John

On Sat, Jun 6, 2015 at 3:30 PM, John Coker <john@xxxxxxxx> wrote:

Here's the preliminary info, before the main airframe has been painted and
without recovery. RockSim gives me 1.0 caliber stability without nose
weight.

John Coker
(650) 302-1555
Retention: Slim-line
Drogue: 12"
Main: 48" elliptical
Alt: TeleMetrum
Main: 800'
dry CG: 31.25
dry mass: 3.5#
stability: 1.0 (RockSim)

On Thu, Jun 4, 2015 at 9:06 AM, Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
wrote:

Please send me your Punisher pre-flight data. I'll be finishing up mine
this weekend.

Thanks,

Chris Kobel





From: Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx,
Date: 06/01/2015 10:17 AM
Subject: [WARNING: SPOOFED E-MAIL--Non-Aerospace Sender]
[roc-chat] Re: Punisher on a K1440
Sent by: roc-chat-bounce@xxxxxxxxxxxxx
------------------------------



Based on the roc-chat traffic, here are the names I've gathered so far
for the Punisher race. Who have I missed?

Chris





From: Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx,
Date: 06/01/2015 08:34 AM
Subject: [WARNING: SPOOFED E-MAIL--Non-Aerospace Sender]
[roc-chat] Re: Punisher on a K1440
Sent by: roc-chat-bounce@xxxxxxxxxxxxx
------------------------------



Here's some of the data I'd like to collect - did I miss anything?

My input isn't complete cuz we still haven't finished our rocket yet!

Chris and James Kobel





From: Kurt Gugisberg <kurtgug@xxxxxxxxx>
To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>,
Date: 05/30/2015 12:32 PM
Subject: [roc-chat] Re: Punisher on a K1440
Sent by: roc-chat-bounce@xxxxxxxxxxxxx
------------------------------



Chris
When I am back in town, I will post my cg info. Probably best to do it
without the motor installed since most people may not have a loaded casing
handy. Perhaps David Reese can provide that info to as he flew it.

Kurt

Sent from my iPhone

On May 26, 2015, at 4:17 PM, Chris J Kobel <*Chris.J.Kobel@xxxxxxxx*
<Chris.J.Kobel@xxxxxxxx>> wrote:

David,

Glad you had a successful flight (and got your rocket back!) Hopefully
you measured the CG position of your Ready-to-Fly rocket so that we can all
match it and be assured of stability.

That said, this drag race offers the opportunity to obtain some
interesting statistics on the Punisher. Given everyone's flying the same
rocket on the same motor, I'd be interested in gathering some performance
numbers including pre-flight mass and maximum altitude from everyone who's
participating.

Chris Kobel



From: David Reese <*dareese@xxxxxxxxx* <dareese@xxxxxxxxx>>
To: *roc-chat@xxxxxxxxxxxxx* <roc-chat@xxxxxxxxxxxxx>,
Date: 05/24/2015 05:49 PM
Subject: [roc-chat] Punisher on a K1440
Sent by: *roc-chat-bounce@xxxxxxxxxxxxx*
<roc-chat-bounce@xxxxxxxxxxxxx>
------------------------------



Hey all,

Just boarded my return flight but I don't want to keep you all waiting in
suspense so I banged this out on my phone real quick:

*https://instagram.com/p/3FdNCgJXpm/*
<https://instagram.com/p/3FdNCgJXpm/>

--david

ps to those of you who I owe phone calls, I'll get to them tomorrow!
We've been busy this weekend...

pps Told ya so :-) [attachment "Punisher Flight Statistics.pdf" deleted
by Chris J Kobel/West/Aerospace/US]



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