Hey Dale,
Good question. You look at the initial thrust. We care about the initial
lift-off and the rocket clearing the tower/rail at a safe speed.
I usually target 5:1 min, look for 10:1 average at RSO table, and enjoy the
hell out of > 10:1 flights, sometimes marking as heads-up (or if a long
impulse like our saucer this weekend).
In your case, with an initial thrust about 35lbs, rocket weighs 10lbs, 3.5
factor - want 5
J350 would be > 180 pounds so that's like 20-1
J275 would be > 75lbs, so that's like 7.5-1
J180 would be > 80lbs, so that's similar
or, double check your CP/CG balance, just wait for no wind, weathercock the
flight at 5 degrees at the away pad, call it a heads up
at the next launch and fly the J135. Let me check it out.
The next and most important question is the construction of the rocket - is
it glas/phenolic or just paper tubes?
Because we shouldn't be worried about 5:1 with something like that.
I wouldn't be recommending a K-Motor for the initial flight if we haven't
done the above.
But, my choices: K454 Skidmark, K250W-P, K695R ... :-)
Hope that helps, fire away with questions - I neglected to say there are a
lot of great CTI loads, but it sounds like you
already have RMS 54-1280/1706 hardware
-james
On Mon, Apr 22, 2019 at 10:01 AM Dale <Dale@xxxxxxxxxx> wrote:
I have a modified LOC Black Brandt (about 2.5ft shorter) weighs 7.2lbs
with everything minus motor & casings. If having a 5:1 ratio is minimum,
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?
Also, Rod Lovely, which K motor were you recommending after its maiden
flight?
Thanks,
Dale
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*From:* tccrockets-bounce@xxxxxxxxxxxxx [mailto:
tccrockets-bounce@xxxxxxxxxxxxx] *On Behalf Of *Michael Gentile
*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
at the launch. Will there
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>
wrote:
Sounds like I missed a great launch. Damn work. Oh well guess that means I
have to be there for DA. Getting that itch to launch a few rockets
Aaron
On Sat, Apr 20, 2019, 20:17 Michael Hall <michaeldh1797@xxxxxxxxx> wrote:
Hey guys, super fun launch today. We got back after the launch a found out
we are missing a aeroteck 54mm 852 casing that must have flown out of a
rocket today. Please let me know if anyone finds it.
Thanks,
Michael Hall
Uc Merced AIAA
On Fri, Apr 19, 2019, 10:03 PM aaron hagadorn <hagadornclassics@xxxxxxxxx>
wrote:
Guys wish I could make it but we t working tomorrow to dig our selves out
of a mess. Hope it is a good launch and see y'all in may at DA2019
On Fri, Apr 19, 2019, 14:47 Steve Sawyer <steve@xxxxxxxxxxxxxxxx> wrote:
Wish we could make it for this year’s first launch but we have Easter
weekend plans. See you in May.
Steve
*From:* tccrockets-bounce@xxxxxxxxxxxxx [mailto:
tccrockets-bounce@xxxxxxxxxxxxx] *On Behalf Of *Ralovley (Redacted sender
"Ralovley" for DMARC)
*Sent:* Friday, April 19, 2019 10:00 AM
*To:* 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>
Date: 4/18/19 11:49 AM (GMT-08:00)
To: TCC chat <tccrockets@xxxxxxxxxxxxx>
Subject: [tccrockets] Re: April Launch
Thanks Mike
On Thu, Apr 18, 2019 at 3:17 AM Michael Gentile <smmike@xxxxxxxxxxx>
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> 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> wrote:
Yes, first launch of the year in April - and just think, we've been rained
out all year!!!
So I expect it to be epic beautiful out there ... I am sure we will have a
great time.
Rockets!
On Sat, Apr 13, 2019 at 4:46 PM Bruce Rohn <bhrohn@xxxxxxxxx> 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>
wrote:
Hey Boys and Girls!
Who's ready to launch some rockets?? Looks like everything is a go for
next Saturday's TCCs Launch! Set up time will be at 8am. Please come 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
