[tccrockets] Re: Who remembers the story?

From: JAMES FRANCO <aldocyber3@xxxxxxx>
To: "tccrockets@xxxxxxxxxxxxx" <tccrockets@xxxxxxxxxxxxx>
Date: Sun, 21 Aug 2022 21:19:30 +0000

Found a great picture of Robert, and of course some of the TCC group sassing
him. Chris is slightly amused. LOL
[cid:image005.png@01D8B569.030D0C90]

Jimmy F.
Tripoli Rocketry Association
Member 12524
Level 3
[Image result for gif of rocket]

From: Mike Smith<mailto:msmith9144@xxxxxxxxx>
Sent: Thursday, May 26, 2022 8:11 PM
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>
Subject: [tccrockets] Re: Who remembers the story?

Robert passed away while on a family vacation. They were in Machu Pichu when he
passed.

On Thu, May 26, 2022 at 1:33 PM Bruce Rohn
<bhrohn@xxxxxxxxx<mailto:bhrohn@xxxxxxxxx>> wrote:
Oh gosh, I remember Robert Zykstra! He had that really cool portable Launch Pad
with a revolving red warning light on it.

I always enjoyed him at our launches and he always made me laugh.

It really made me sad to hear how he met his end in Peru (I think he was high
on a mountain in Peru when he had a heart attack...did I get that right folks?)

I will miss him alot, and Mr. Moreno.

On Wed, May 25, 2022 at 9:09 PM JAMES FRANCO
<ALDOCYBER3@xxxxxxx<mailto:ALDOCYBER3@xxxxxxx>> wrote:
Fwd: [tccrockets] Re: Drag separation

Here is the original email string from the chat.
We used to have good discussions on the chat, let's start that up again.

-----Original Message-----
From: Jimmy Franco <aldocyber3@xxxxxxx<mailto:aldocyber3@xxxxxxx>>
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>
Sent: Mon, Oct 21, 2013 7:22 am
Subject: Re: [tccrockets] Re: Drag separation
Robert
pretty sure the nosecone is in the trailer,
but it had some shoulder damage on it.

Jimmy F.
TRA 12524

From: Cliff Sojourner<mailto:cls@xxxxxxxxxxxxx>
Sent: Monday, October 21, 2013 12:04 AM
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>
Subject: [tccrockets] Re: Drag separation

On 2013-10-21 00:03, AiRobert wrote:
Yep, that looks like it. Where did it end up at?

on Bruce's head, duh!

RZ

From: tccrockets-bounce@xxxxxxxxxxxxx<mailto:tccrockets-bounce@xxxxxxxxxxxxx>
[mailto:tccrockets-bounce@xxxxxxxxxxxxx] On Behalf Of Ryan G. Coleman
Sent: Sunday, October 20, 2013 9:53 PM
To: TCC Rockets
Subject: [tccrockets] Re: Drag separation

Is this the nose cone you're looking for?

On Sun, Oct 20, 2013 at 9:33 PM, Jack Garibaldi
<jackgaribaldi@xxxxxxx<mailto:jackgaribaldi@xxxxxxx>> wrote:
That body and fins you had was pretty big and draggy, when I left your black
nose cones was on the table

Jack G

From: tccrockets-bounce@xxxxxxxxxxxxx<mailto:tccrockets-bounce@xxxxxxxxxxxxx>
[mailto:tccrockets-bounce@xxxxxxxxxxxxx<mailto:tccrockets-bounce@xxxxxxxxxxxxx>]
On Behalf Of AiRobert
Sent: Sunday, October 20, 2013 9:28 PM
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>
Subject: [tccrockets] Drag separation

Apparently the nosecone drag separated on my rocket Friday, even though I had
three #2 nylon shear screws installed.
As I understand it, drag separation is caused by the airframe and fins having
more drag than the nosecone, so the airframe slows down faster than the
nosecone (After the motor quits).
According to Rocket Materials
http://www.rocketmaterials.org/datastore/cord/Shear_Pins/index.php
The three pins should have held about 60 pounds of force.
After re-running RockSim with the biggest motor available the maximum
deceleration was about 200 feet/sec/sec. (The actual motor used showed about
150 f/s/s deceleration.) That is about 6.25g of deceleration. Assuming that the
nosecone produce no drag it would mean that the nosecone would have to weigh 10
pounds to break the shear pins.
While I haven’t weighed the nosecone I’m sure it’s less than 10 pounds and that
it also produces some drag and that the total deceleration was less than 6.25 g.

Am I missing something on the calculations?

Robert Zylstra
PS Anyone find a 7.5 inch black plastic nosecone?

No virus found in this message.
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1 Attached Images
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Jimmy F.
Tripoli Rocketry Association
Member 12524
Level 3

From: JAMES FRANCO<mailto:ALDOCYBER3@xxxxxxx>
Sent: ‎Wednesday‎, ‎May‎ ‎25‎, ‎2022 ‎21‎:‎01
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>

First of all this story is related to Robert Zylstra, I loved hanging out with
that guy.

So the story is a good lesson in rocket aerodynamics and the force the air
imposes moving over a rocket’s airframe in conjunction with motor burnout,
specific to drag separation.
We should all try to learn something from each of our flights and other’s
flights as well, makes us better fliers and safer.

I came across this old email today from 2013 which I will forward next.

Jimmy F.
Tripoli Rocketry Association
Member 12524
Level 3

From: Rob Diehl<mailto:dmarc-noreply@xxxxxxxxxxxxx>
Sent: ‎Wednesday‎, ‎May‎ ‎25‎, ‎2022 ‎19‎:‎54
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>

L3 attempt gone wrong?

I know there have been problems with Der Red Max launches
Sent from my iPhone

On May 25, 2022, at 5:25 PM, JAMES FRANCO
<aldocyber3@xxxxxxx<mailto:aldocyber3@xxxxxxx>> wrote:

Hint,

The nose cone is from a 8" Der Red Max

Jimmy F.
TRA 12524
L3

-------- Original message --------
From: Bruce Rohn <bhrohn@xxxxxxxxx<mailto:bhrohn@xxxxxxxxx>>
Date: 5/25/22 16:58 (GMT-08:00)
To: tcc-chat <tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>>
Subject: [tccrockets] Re: Who remembers the story?

Hello, I am Conehead Bruce, I am from France and I eat MASSIVE QUANTITIES!!!!!

On Wed, May 25, 2022 at 3:39 PM Rob Diehl
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:
I remember the pic. I don’t remember the story.
Sent from my iPhone

On May 25, 2022, at 3:23 PM, JAMES FRANCO
<aldocyber3@xxxxxxx<mailto:aldocyber3@xxxxxxx>> wrote:

[cid:18102106ef2dfd362171]
LOL

Jimmy F.

Tripoli Rocketry Association

Member 12524

Level 3

--
Sent from Gmail Mobile

Follow-Ups:
- [tccrockets] Re: Who remembers the story?
  - From: Gene Engelgau
- [tccrockets] Re: Who remembers the story?
  - From: shawn stephens

[tccrockets] Re: Who remembers the story?

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