Estes must still use the string swing test not Rocsim. It is stable with an EJ F52 stock with no clay. The fins are huge. I believe the clay is used to optimize delays for the crippled motors they suggest.

Stop using thrust rings!

Jerry

Heck, at least they have a Goblin !!! May I buy 100? I used to buy their rockets 400 at a time.

Actually I don't use RockSim to design Estes models. I fly them to see what the stability looks like. I do however have to show a 1.5 Margin of stability on designs that I can actually create in RockSim. The Goblin actually has pretty small fins, although there are for of them! This being a Bring Back it had to meet the same 1.5 Margin of Stability.




Most fliers will loose this model using a D motor in the fields they fly at let alone an F52.



Sure you can buy 100, just go to the Estes or any other web site and put a 100 for your quantity.

I's glad to see your back to saying negative things about Estes. It suits you better.

John Boren

JumpJet, Thanks once again for bringing back another classic for new rocketeers to enjoy, and of course myself. I would still like to see the Omega brought back, just because she is such a classic rocket. I brushed on 3 coats of balsa sealer, shot one coat of grey primer, 2 coats of gloss yellow and when she is dry I will shoot the black fin.

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The Goblin looks sweet!

I never had one of these; I'd be tempted, but I have three Scorpions (clone or SLS Semroc) built and two more unbuilt. They a kin to the Goblin, in that if you fly with the largest recommended motor you'll likely never see it again.

Someday I'll launch one of those with a E16-8, a motor close to the old Mini-Max end-burners.

__________________
NAR #27085 - Oregon Rocketry - SAM

Great work on the Goblin!
It's good to see a classic done right.

The new plastic nose cone looks right to me.
At the launch field, I don't think anybody would ever question a very subtle change in the shape anyway.

__________________
Hans "Chris" Michielssen
Old/New NAR # 19086 SR

www.oddlrockets.com
www.modelrocketbuilding.blogspot.com
http://www.nar.org/educational-reso...ing-techniques/
Your results may vary
"Nose cones roll, be careful with that."
Every spaceman needs a ray gun.
Look out - I'm the Meister Shyster!

Twenty plus feet will hide a lot of flaws.

__________________
'Til next time,

Mike Toelle

NAR 31692 L1

SAM 0373

I seem to recall that Bill "Wallyum" Eichelberger's 'safe distance' for finishes begins at, "Not bad from six feet away."

Cheers,

__________________
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

If it looks good, that is all that counts. I have a lot of kits to build so I don't mind flaws in my builds.......after the first flight there is always a small nick somewhere. I finished the Goblin today, the decals went on great and she looks just like the old Goblin, good job Estes. I used Rustoleum Rust Stop paints and primer.

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JumpJet, 1+ on the bump for another Omega. Given the great improvements in micro-DV-recorders since Estes' last DV products, maybe it's also time for a revision to the Cineroc shell design to go along with it. It would be nice to have a modern microDVR in that classic housing, using either a USB or an SD card (or both!) to spit out the stream.

__________________
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

Scigs, as always, very nice build! The classics are always a nice addition to a fleet.

__________________
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