[roc-chat] Re: 4" Goblin on K2045
- From: Lakestake Rocketry <lakestake@xxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Mon, 2 Apr 2012 11:47:28 -0700
Dok and I outflew Wedge at the first 4" Goblin drag race. We were on the
75mm K and Wedge was flying the 98mm. That is the 1499 and 1999 IIRC. No
problem with either of the flights going up.
Mike's notes 1, 2 and 4 are quite relevant.
Our goblin had stock fins, a OEM fiberglass Nike nosecone and some CF on
the airframe. (And a custom-machined slimline retainer of course.)
Wedge, what were you flying that day?
Matt
On Apr 1, 2012 7:47 PM, "Mike & Nancy Kramer" <kramer@xxxxxxxxxxxx> wrote:
> Launched a heavily modified 4" goblin on a K2045, no grain collapse, but
> the chute never came out, when i dug it out of the crater (yes crater)
> there were shreds of the nosecone at the bottom of the of the carnage. I
> never did figure out why the nose never ejected. The motor case was
> 'significantly distorted' after the landing, the entire front of it was
> flared back over the back of the motor. Bought Jack a new case that day,
> it was a loaner.
>
> Couple of things;
>
> 1) Get a tracker, it was impossible to see it going up
> 2) Beware of whiplash
> 3) Come up with a cool name, we went with the Shred Zeppelin
> 4) Can I watch
> 5) Doc tried a near stock goblin on a K1999, it re kitted about 50 feet up
>
> Mike Kramer
>
>
> On 4/1/2012 6:32 PM, Leslie Stephens wrote:
>
> I remember a drag race at ROC with 4" goblins on K-1999'z after seeing
> that i believe a K2045 should be ok
>
> Andy H
>
> On Apr 1, 2012, at 6:16 PM, Steve Trammell wrote:
>
> Forgot about grain collapse. Looks like some more research is in
> order. It is rocket science after all :-)
>
> Thanks all,
>
>
> On Sun, Apr 1, 2012 at 5:44 PM, Gene Engelgau wrote:
>
> At 92 g's You could collapse the propellant grains and make a big boom!
> Fiber glassing the fins will not help in that case.
> --
> - Regards
>
> Gene Engelgau
> KI6IBL, NAR 86770 / TRA 12243 - L3
> *http://fruitychutes.com* <http://fruitychutes.com/> - Consumer and
> Aerospace Recovery Solutions
> *Like us on Facebook!* <http://www.facebook.com/fruitychutes>
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> 408-499-9050
>
>
> On Sun, Apr 1, 2012 at 5:21 PM, JACK GARIBALDI < *JackGaribaldi@xxxxxxx*>
> wrote:
> Maybe glass the fins and I think it will work
> Jack
>
> Sent from my Mil Spec IPhone 4S
>
> On Apr 1, 2012, at 5:11 PM, "Steve Trammell" < *stramm8235@xxxxxxxxxxx*>
> wrote:
>
> I'm thinking of flying a 4" Goblin (stock build + fin fillets) on a CTI
> K2045. I've flown this rocket on a number of K motors including 2
> successful K1100 flights. The K1100 flights pulled 40g's and reached 1,000
> MPH. A K2045 flight sims to 92g's and 1100+ MPH. Any thoughts?
>
>
>
> Also, does CTI V-Max propellant use standard delay charges or are
> electronics needed like AT Warp9 propellant?
>
>
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