That's while I'll be flight testing the latest riff on my Prometheus design. It's at 1.70 calibers empty, and 0.94 marginal on a C6-5. (crossing fingers)
.

__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014

Since I know that OpenRocket does not know how to deal with Tube Fins (Yet), and this rocket has two of them (The rings), it will give a result a bit lower than expected for stability. That said, since it does not appear that adding .5 oz of nose weight will really hurt anything I may go ahead and do that. As you said, it was already a marginally stable design, and will depend somewhat on how well the rocket is built (i.e. any extra weight added to the tail).

Also, it's nice to have a good output from Open Rocket / RockSim with you just in case the RSO has any questions on the rocket.

__________________
Member: Washington Aerospace Club NAR Section #578
NAR #94383
TRA #15009
HPR Level 2

I wonder if Rocksim would say that a bumblebee can't fly? :-)

__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
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http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR

Reading through these posts, I begin to wonder just how accurate the mass/weight data is in the MATERIALS file...

Had to go back and look at the 1968 catalog page, and sure enough, it "recommends" the C6-5 as the upper-end engine.

RockSim is known to have trouble with RT calculations, so anything it reports concerning the Starlight needs to be examined with a pound of salt if you're using a ringtail component.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

That's been one of my disappointments with Rocksim over the years. When upgrades would come out, it'd be a letdown to find the same, old support files with the same errors in them. One that comes to mind concerns the dimensions for BT-80. The ID is listed as 2.588" instead of 2.558".

The way the tool works, it calculates the mass based on the volume of paper (ie, circumference x thickness x length x density). With the ID wrong, the tube mass comes up very light (equivalent to about one wrap of kraft paper )

Not sure if this ever got fixed. (I'm running v7.1.)

Doug

.

__________________
YORF member #11

I'm running BSILG. I occasionally have problems, but I have yet to open a black hole that sucks all life into its maw.

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

BSILG?? Is that a knock off on TLAR?

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Dave
Fire is the leading cause of fire.
Was once SAM#0132

I wondering the same thing, Dave. I think the ILG part means "it looks good".

Can't figure out the BS part, tho

Doug

.

__________________
YORF member #11

"Bill Says It Looks Good" ???

__________________
Jon
SAM #0396
BAR 02/07
NAR 86940
KF4GUL
Aim high, fly straight!

I was thinking the same thing on the ILG.
Maybe the BS is just that.

B S It Looks Good.

__________________
Dave
Fire is the leading cause of fire.
Was once SAM#0132