Have you tried RockSim or OpenRocket?
Regards,
Toby Vanderbeek
tobyvanderbeek@xxxxxxxxx
On Mon, Apr 22, 2019 at 11:56 AM <steven@xxxxxxxxxxx> wrote:
Actually, you don't calculate safe lift off thrust to weight ratio on
average or peak thrust. Look at the thrust curve and find the thrust
during the first second of engine burn. Your rocket will leave the rail
or tower in a second or so. Therefore, that first part of the thrust
curve is what to use to calculate your lift off thrust to weight ratio.
If your rocket hasn't got sufficient speed by the time it leaves the
rail it won't have much stability control from the fins. A 5:1 lift off
ratio with a 10 foot rail is the reason we calculate the ratios the way
we do. If you had a 20 foot rail, (rather than a 10 foot rail) then a
longer time span could be used to determine if the rocket reached flight
stability.
I hope this helps.
Steven Cerri, B.S. Aero, M.S. Geophysics, MBA
Author of: "The Fully Integrated Engineer: Combining Technical Ability
and Leadership Prowess",
published by Wiley and IEEE
STCerri International
231 Market Place, Suite 320
San Ramon, CA 94583-4743 USA
Office: 925-735-9500
Email: steven@xxxxxxxxxxx
Website: www.stevencerri.com
-------- Original Message --------with everything minus motor & casings. If having a 5:1 ratio is minimum,
Subject: [tccrockets] Proper motor calc?
From: Dale <Dale@xxxxxxxxxx>
Date: Mon, April 22, 2019 10:01 am
To: "tccrockets@xxxxxxxxxxxxx" <tccrockets@xxxxxxxxxxxxx>
I have a modified LOC Black Brandt (about 2.5ft shorter) weighs 7.2lbs
when I add 2.5lbs using a J135 I have 9.7lbs total lift off weight. When I
calculate the ratio on the average thrust verses I get 3.6: 1 and with the
peak thrust 6.3: 1. So, do we calculate the ratio for liftoff on the
average or peak thrust? Would this be a safe motor for this rocket weight?
flight?
Also, Rod Lovely, which K motor were you recommending after its maiden
through AE Wealth Management, LLC (AEWM). AEWM and Soutas Financial &
Thanks,
Dale
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333 West Shaw Avenue, Ste 106 | Fresno, CA 93704
toll free 800.887.2348 | PHONE 559.230.1648 | FAX 559.230.1651
dale@xxxxxxxxxx<mailto:dale@xxxxxxxxxx> | soutas.com
Investment advisory services offered only by duly registered individuals
Insurance Solutions Inc are not affiliated companies.
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services firm that creates retirement strategies using a variety of
Investment advisory services offered through AE Wealth Management, LLC.
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tccrockets-bounce@xxxxxxxxxxxxx] On Behalf Of Michael Gentile
From: tccrockets-bounce@xxxxxxxxxxxxx [mailto:
at the launch. Will there
Sent: Sunday, April 21, 2019 10:19 PM
To: tccrockets@xxxxxxxxxxxxx
Subject: [tccrockets] Re: April Launch
AeroTech order is going in tomorrow afternoon. If you need motors for
DA or beyond please order by 3pm. Sorry I meant to make an announcement
<mailto:hagadornclassics@xxxxxxxxx>> wrote:
be a Nike drag race? Do we need K2050’s?
Mike @ BAR
Sent from my BAR GREEN iPhone
On Apr 21, 2019, at 8:35 AM, aaron hagadorn <hagadornclassics@xxxxxxxxx
I have to be there for DA. Getting that itch to launch a few rockets
Sounds like I missed a great launch. Damn work. Oh well guess that means
<mailto:michaeldh1797@xxxxxxxxx>> wrote:
Aaron
On Sat, Apr 20, 2019, 20:17 Michael Hall <michaeldh1797@xxxxxxxxx
out we are missing a aeroteck 54mm 852 casing that must have flown out of a
Hey guys, super fun launch today. We got back after the launch a found
rocket today. Please let me know if anyone finds it.
hagadornclassics@xxxxxxxxx<mailto:hagadornclassics@xxxxxxxxx>> wrote:
Thanks,
Michael Hall
Uc Merced AIAA
On Fri, Apr 19, 2019, 10:03 PM aaron hagadorn <
out of a mess. Hope it is a good launch and see y'all in may at DA2019
Guys wish I could make it but we t working tomorrow to dig our selves
steve@xxxxxxxxxxxxxxxx>> wrote:
On Fri, Apr 19, 2019, 14:47 Steve Sawyer <steve@xxxxxxxxxxxxxxxx<mailto:
weekend plans. See you in May.
Wish we could make it for this year’s first launch but we have Easter
tccrockets-bounce@xxxxxxxxxxxxx> [mailto:tccrockets-bounce@xxxxxxxxxxxxx
Steve
From: tccrockets-bounce@xxxxxxxxxxxxx<mailto:
<mailto:tccrockets-bounce@xxxxxxxxxxxxx>] On Behalf Of Ralovley (Redacted
sender "Ralovley" for DMARC)
<mailto:smmike@xxxxxxxxxxx>> wrote:
Sent: Friday, April 19, 2019 10:00 AM
To: tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>
Subject: [tccrockets] Re: April Launch
Hope to see everyone tomorrow!
Rod Lovley
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: James Dougherty <jafrado@xxxxxxxxx<mailto:jafrado@xxxxxxxxx>>
Date: 4/18/19 11:49 AM (GMT-08:00)
To: TCC chat <tccrockets@xxxxxxxxxxxxx<mailto:tccrockets@xxxxxxxxxxxxx>>
Subject: [tccrockets] Re: April Launch
Thanks Mike
On Thu, Apr 18, 2019 at 3:17 AM Michael Gentile <smmike@xxxxxxxxxxx
jafrado@xxxxxxxxx>> wrote:
BAR will be there. 8am it is!
Mike @ BAR
Sent from my BAR GREEN iPhone
On Apr 18, 2019, at 12:28 AM, James Dougherty <jafrado@xxxxxxxxx<mailto:
<mailto:jafrado@xxxxxxxxx>> wrote:
Hey Folks,
NOTAM is hot, we're cleared for SFC to 17K MSL on Saturday.
Like Rod said, lets all try to show up at 8am sharp!
Woohoo - get your rockets ready!
-James
On Sat, Apr 13, 2019 at 5:00 PM James Dougherty <jafrado@xxxxxxxxx
rained out all year!!!
Yes, first launch of the year in April - and just think, we've been
a great time.
So I expect it to be epic beautiful out there ... I am sure we will have
bhrohn@xxxxxxxxx>> wrote:
Rockets!
On Sat, Apr 13, 2019 at 4:46 PM Bruce Rohn <bhrohn@xxxxxxxxx<mailto:
<mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:
Hard to believe it will be first launch of the year.
I expect A LOT of rockets!!
On Sat, Apr 13, 2019, 3:18 PM Ralovley <dmarc-noreply@xxxxxxxxxxxxx
for next Saturday's TCCs Launch! Set up time will be at 8am. Please come
Hey Boys and Girls!
Who's ready to launch some rockets?? Looks like everything is a go
help out with the set up and teardown! The more people that can volunteer
is appreciated alot! The weather as of now looks outstanding! NO MUD!😆
See you all there!
Rod Lovley
Sent from my Verizon, Samsung Galaxy smartphone
