[roc-chat] Re: 4" Goblin on K2045
- From: Phil Laisure <pal129@xxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Mon, 2 Apr 2012 16:36:13 -0700 (PDT)
I have to chime in here. I flew in the drag race too, used a CTI K-1200. I
lost it immediately, never did find it. I named it "Elvis", so when I do go
looking for it, I just tell people I'm looking for Elvis........ :-) Phil
________________________________
From: Wedge Oldham <wedgeoldham@xxxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx
Sent: Mon, April 2, 2012 3:14:21 PM
Subject: [roc-chat] Re: 4" Goblin on K2045
My Goblin had 2 layers of 6 oz glass on each side. BUT....I cut off the fin
tabs, and all three fins were surface mounted.
I wouldn't worry too much about grain colapse; or even a shred. When we
started
teh idea of a 4" goblin drag race Andy and myself tried to shred a STOCK
goblin,
and had a very hard time. Only when we steped it up to the 6 grain 54mm motor
could we get it to shred.
The hard part is finding the Goblin after you're done.
Wedge
On Mon, Apr 2, 2012 at 11:47 AM, Lakestake Rocketry <lakestake@xxxxxxxxx> wrote:
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 - Consumer and Aerospace Recovery Solutions
>>>>Like us on Facebook!
>>>>Follow us on Twitter!
>>>>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?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
Other related posts:
