Love the idea, just need to account for the added weight. Don't think C's are gonna cut it. Mine was marginal with E16s or D12s with a small Lipo,sled and Quantum. Quickly reaches a point where b.p. just does not make sense.
Modified Estes two stage F 15 powered Ascender with Apogee C6-0 strap-on pods
- Thread starter Tom Zachman
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Looks like the shortest delay on the quest D motors is four seconds so this may be a bit close.
Attach your side pod boosters to your main booster rather than to the sustainer (don’t use your apogee strap ones) They can blow streamers or parachutes off at the end of their delay
You will ignite your central as well as your booster side parts at initial ignition which should give you enough impulse to get off the pad.
The problem with the long delay is that the Booster may have already reached the ground before it pops the parachutes. That’s a fire risk.
I routinely use a side pod A8-3 on my long stage rockets
D 12 zero on the main with an immediate adjacent outboard A8-3 on a BT 20 body to with its own parachute and nose cone. This pops the chute after separation of the sustainer ....a few seconds late but has worked extremely well.
4 second delay might be pushing it.
Attach your side pod boosters to your main booster rather than to the sustainer (don’t use your apogee strap ones) They can blow streamers or parachutes off at the end of their delay
You will ignite your central as well as your booster side parts at initial ignition which should give you enough impulse to get off the pad.
The problem with the long delay is that the Booster may have already reached the ground before it pops the parachutes. That’s a fire risk.
I routinely use a side pod A8-3 on my long stage rockets
D 12 zero on the main with an immediate adjacent outboard A8-3 on a BT 20 body to with its own parachute and nose cone. This pops the chute after separation of the sustainer ....a few seconds late but has worked extremely well.
4 second delay might be pushing it.
Thanks!!! Lots of good advice. Decided to first flight without the booster just to make sure everything works then will try (with RSO consent) other ideas. This is going to be fun at the mid-power level.
OK, this is changing the original concept a lot, probably out of bounds. Use the staging charge from the D12-0 or E-12-0 to separate the side pods, but put fins on the pods so they keep going up after they separate. That'll give plenty of time for the minimum Q-Jet delay before popping their streamers. Heck, you might even need a longer delay on the side pods. So the sequence is this: All three boosters light; the side pods burn out but stay in place for a little while longer while their delays begin burning; the central booster burns out and causes everything to separate; the central booster immediately starts to tumble; the side pods coast up for long enough to finish burning the delay; the side pods pop streamers.
I haven't check the sequence carefully with the Q-Jet and D12/E12 burn times, so it might not even work, but I suspect it will. On the other hand, it means both adding fins to the pods and holding on to the pods longer, so it looses some of the drag benefit of dropping them.
I haven't check the sequence carefully with the Q-Jet and D12/E12 burn times, so it might not even work, but I suspect it will. On the other hand, it means both adding fins to the pods and holding on to the pods longer, so it looses some of the drag benefit of dropping them.
Dear Joe-
Wow! Excellent concepts but first I have to crawl before I could run with your ideas. My first baby step will be to just successfully ignite three BP motors at the same time. That said many thanks for the input and appreciate your efforts.
Wow! Excellent concepts but first I have to crawl before I could run with your ideas. My first baby step will be to just successfully ignite three BP motors at the same time. That said many thanks for the input and appreciate your efforts.
Ok Gentlmen, we have an opportunity (weather permitting ) to prove this concept this coming weekend. I realized there is an NAR launch at Bong this weekend so I dug through the "pile" and found enough stuff to re build. Round 2 will consist of an F 15/0 and a pair of D 12/0's in the booster and an F15/6 in the sustainer. I have three Q2g2s on hand for ignition duties so no worries there. O.R. claims 48.6 fps off of an 8'rail. Any bets?
Hey looks good to me. Keep us posted. Good luck all the way around.
I like the cones on the pods a lot, but... The D12-0 blowthrough is certainly hotter and probably more violent than a regular ejection charge. Sadly, I predict that the streamers won't survive, as there's not much space for wadding.
Otherwise, I decline to predict either success of failure, but I don't see why it wouldn't succeed. Best of luck.
Otherwise, I decline to predict either success of failure, but I don't see why it wouldn't succeed. Best of luck.
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Easy fix with minimal weight cost. Add a 4-6 inch extension tube forward of each side booster. You can just put in a coupler, then the nose cones for the side booster will be further forward. Will give you plenty of room for wadding, even could swap out streamers for small parachutes (with three expended motor casings, that booster is gonna come down hard.)
For reasons I don’t understand, your Rocket seems unusually heavy. In cases where you have a better thrust to weight ratio, using longer booster side pods also helps stability, as the longer tubes can move the CG forward. If you could afford the weight, I would have recommended using up to 18” on the side pods with even a little weight in the nose cones if needed for stability.
Hope you get 4 straight trails!
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One way or other, it will be a spectacle!Cosmetics are obviously out the window, just need it to fly in a spectacular fashion
Yup, has a fair chance of melting the streamers. I did what I could to mitigate it though by stuffing the void in the motor case w/barf and taping over it, then stuffed another 1/2" or so on top. The nose cones are green because that was the only spool of petg I had at that time, the whole thing's kind of an eyesore but function was the goal. Considering what she's been through...
As an added bonus I'll also be wearing my spectacles..
Black, white, bright green, bright red, and silver mylar - at least it'll be easy to see. You could name it "All Together Now".
Black, white, green, red,
Can I bring my friend to bed?
Pink, brown, yellow, orange and blue
I love you.
Can I bring my friend to bed?
Pink, brown, yellow, orange and blue
I love you.
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Bom bom bom
Bom ba-bom, launch the rocket.
Bom ba-bom, climb the tree.
Bom ba-bom, cut the shrouds.
Bom ba-bom, look at me!
Bom ba-bom, launch the rocket.
Bom ba-bom, climb the tree.
Bom ba-bom, cut the shrouds.
Bom ba-bom, look at me!
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beeblebrox
8 C6-0, 12 D11-9, 20 D20-0, 20 E5-0, 3 Cinerocs
If you are using streamers on the booster, use D12-3's...Then you get a normal ejection charge, altitude of first stage more than sufficient for a short delay before streamer deploy, use nomex for the streamer, flame retardant...
https://www.amazon.com/gp/product/B07N119K8B/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Better choice would be 2 E30-4's instead of the D12's.
Note: Iflew a stock ascender off a 9 ft rail in dead calm weather, It still tipped off and was horizontal at burnout of booster, upper stage crashed, the rocket is too heavy for the F15's. You definately need the cluster, Use 4 or 6 x C11-3's if you want to keep the altitude down.
https://www.amazon.com/gp/product/B07N119K8B/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Better choice would be 2 E30-4's instead of the D12's.
Note: Iflew a stock ascender off a 9 ft rail in dead calm weather, It still tipped off and was horizontal at burnout of booster, upper stage crashed, the rocket is too heavy for the F15's. You definately need the cluster, Use 4 or 6 x C11-3's if you want to keep the altitude down.
There are much better ways of doing this, but only 1 way of doing it with what I currently have. I'd be willing to bet a dollar that it's going to be successful, at least in being recoverable and able to fly again. Yes, I said a Dollar...
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Congrats!
Booster and sustainer intact?
Streamers deployed without burning up?
Booster and sustainer intact?
Streamers deployed without burning up?
Booster recovered intact, streamers are fine but the kevlar did zipper the tubes. Unfortunately the sustainer has not been recovered. Since I failed to put a tracker in it's probably another sacrifice to the swamp gods.
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Lemme guess, you went with the F15 in the sustainer?
H 
ere's a couple of screenshots. Unfortunately Samsung downgraded the feature from Note4 where you could simply pause a video and do a screengrab, now it requires a "palm swipe" which basically totally completefully sucks.
ere's a couple of screenshots. Unfortunately Samsung downgraded the feature from Note4 where you could simply pause a video and do a screengrab, now it requires a "palm swipe" which basically totally completefully sucks.
