Professional AmateurTRF Supporter
- Mar 5, 2020
- Reaction score
- Eastern Shore, VA
I can’t believe it’s not butter!Streamer Fixture
I made the 172" long streamer for the 4th stage. In order to make this tedious task a bit more efficient I built a simple fixture to make the creases.
It's just a 2 x 4 which I used a back saw to cut some slots across across. They're spaced at 1-1/2" which is just right for the 1/2A3 motor dia. of 0.53".
A table knife upside down makes a crease across the streamer, use every other slot, then flip the streamer over and crease the streamer on the other side for the adjacent slots.
Then take the streamer, fold it at the crease and then use your thumb and fore finger to make the crease nice and tight. Rinse and repeat 115
Some of that holographic reflective tape might have helped Fabio scare that bird away from the rollercoaster, and his nose!I can’t believe it’s not butter!View attachment 571940
Some of that holographic reflective tape might have helped Fabio scare that bird away from the rollercoaster, and his nose!
So long as we are wandering off the rails (what’s the status on the rail launched rocket, BTW?) there is a NASA story on bird strikes (hey at least NASA has something to do with rocketry on most days)Is there no end to the knowledge base on this site.... and the plot twists in this thread?
Never Forget the Day Fabio Killed a Bird With His Face and Changed the WorldA goose lost its life. America lost its innocence.www.esquire.com
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So long as we are wandering off the rails (what’s the status on the rail launched rocket, BTW?) there is a NASA story on bird strikes (hey at least NASA has something to do with rocketry on most days)
the Japanese were finalizing the testing of their bullet train, and there was concern that the driver’s cockpit window Might not hold up to bird strikes. They learned that NASA had actually developed a “bird cannon” to fire chickens at the canopy to test the Shuttle. They asked to borrow it and NASA shipped it over.
on the first test, the deployed bird sheared through the cockpit, THROUGH the headrest of the driver’s seat, and embedded itself in the rear wall of the cockpit! The Japanese were stunned, the specs on the windscreen had predicted it would easily handle the impact.
they contacted NASA to see if the cannon settings were off or some other issue could be the problem.
NASA sent a three word reply:
”Thaw The Chicken.”
Installed some fishing line leaders that will secure the recovery shock chords and take the heat of the BP ejection charges for the 1st and 2nd stages of my Saturn V.
Good luck with those leaders, I quit using them after 3 broke on 3 separate rockets, I can look but iirc they are not a good grade stainless and are not anti-corrosive enough.
Do you remember what motor's you were using them with, what the weight of the rockets were?
Estes Mean Machine ,full length couplers and baffle, Estes equivalent 24mm BP charge in AT 24/40 E28T
Scratch 2 stage SA-3/S-125 Pechora, Estes C6-5 and C6-3 (iirc, as I didn't want both ejection charges going off at the same time).
Stock built clone of the Estes Blue Bird Zero, again with Estes 24mm BP charges but using the AT 24/40 cases.
None had more than 5 flights on them after being built when I re-re-re-re-BARred in 2015ish, none have been repaired yet either, and its been over 6 years. I thought the "stainless" fishing leaders were a great idea for LPR rockets, I don't think that way anymore, now they all get 800lb kevlar and I haven't had an issue since.
Did they fail at the crimp locations?
After confirmation....the answer would be yes they failed at the crimp locations, FYI I also use longer kevlar harnesses with taped z-folds to mitigate shock loading the harnesses. I found all three rockets, one the leader is totally missing, the other two the leaders were still attached but the entire crimp end was missing including the ferrule, but I still had the snap link attached to the harness.
Pretty work!Motor Retainers
I made these from 12 ga. aluminum sheet (0.075" th.). They prevent the 1st and 2nd stage motors from exiting the bottom of the rocket at ejection / staging.
<---- When in doubtFancy positive motor retention only if it passes Der Pad Fuhrer's weight and balance requirements! Otherwise it is the art of friction fitting each motor with cheapo tape. Such a pain.
The Comrade General Secretary is confident of his "Belt and Road Initiative." He is looking forward too seeing this new Capitalist "Belt and Suspenders" project implemented!<---- When in doubt
In this case the motor retainers are an example of "a belt and suspenders". There's more than enough thrust to go around, so eliminating 10 artfully done friction fits with two hell-for-stout aluminum plates is logical and proportionate.
Don't lead the shock cord through like what they've shown. If they can slide around, they'll stay wrapped around your chute and keep it from unfurling. I like to tie them off a foot or two from the parachute (at least) so that when the burrito comes out of the rocket the fire blanket is pulled away from the chute.Ordered the BP Motors and a couple 9" Nomex chute protectors yesterday from Apogee Components. I've never used Nomex before, not sure if those really are needed though. But, it'll be nice to have them in my arsenal just in case.
If you've used these... got any tips?
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You will have to perform many pagan ceremonies to appease the entire pantheon of rocket gods before launching this bad boy! The line between science and necromancy has been blurred. Remember Mickey Mouse as the Sorcerer's Apprentice in Fantasia, the bigger the cluster, the better!BP is in the house.. tip of the hat to Apogee Components... Parts only took 2 days to arrive, and I used their discount coupon "Tool423" and got a free Needle File Set.
It's so freakin' dry here though.. going to have to hire an Indian to do a ran dance.
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Well, if I remember my geography, you and Apogee are in the same state.Parts only took 2 days to arrive
And the USPS is involved...Well, if I remember my geography, you and Apogee are in the same state.
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